HTTP/2 Headers Type Updates

Motivation:
The HTTP/2 RFC (https://tools.ietf.org/html/rfc7540#section-8.1.2) indicates that header names consist of ASCII characters. We currently use ByteString to represent HTTP/2 header names. The HTTP/2 RFC (https://tools.ietf.org/html/rfc7540#section-10.3) also eludes to header values inheriting the same validity characteristics as HTTP/1.x. Using AsciiString for the value type of HTTP/2 headers would allow for re-use of predefined HTTP/1.x values, and make comparisons more intuitive. The Headers<T> interface could also be expanded to allow for easier use of header types which do not have the same Key and Value type.

Motivation:
- Change Headers<T> to Headers<K, V>
- Change Http2Headers<ByteString> to Http2Headers<CharSequence, CharSequence>
- Remove ByteString. Having AsciiString extend ByteString complicates equality comparisons when the hash code algorithm is no longer shared.

Result:
Http2Header types are more representative of the HTTP/2 RFC, and relationship between HTTP/2 header name/values more directly relates to HTTP/1.x header names/values.

buffer/src/main/java/io/netty/buffer/AbstractByteBuf.java

@@ -33,6 +33,7 @@ import java.nio.channels.GatheringByteChannel;
 import java.nio.channels.ScatteringByteChannel;
 import java.nio.charset.Charset;
 
+import static io.netty.util.internal.MathUtil.isOutOfBounds;
 
 /**
  * A skeletal implementation of a buffer.
@@ -1110,7 +1111,7 @@ public abstract class AbstractByteBuf extends ByteBuf {
     }
 
     final void checkIndex0(int index, int fieldLength) {
-        if (isInvalid(index, fieldLength, capacity())) {
+        if (isOutOfBounds(index, fieldLength, capacity())) {
             throw new IndexOutOfBoundsException(String.format(
                     "index: %d, length: %d (expected: range(0, %d))", index, fieldLength, capacity()));
         }
@@ -1118,7 +1119,7 @@ public abstract class AbstractByteBuf extends ByteBuf {
 
     protected final void checkSrcIndex(int index, int length, int srcIndex, int srcCapacity) {
         checkIndex(index, length);
-        if (isInvalid(srcIndex, length, srcCapacity)) {
+        if (isOutOfBounds(srcIndex, length, srcCapacity)) {
             throw new IndexOutOfBoundsException(String.format(
                     "srcIndex: %d, length: %d (expected: range(0, %d))", srcIndex, length, srcCapacity));
         }
@@ -1126,16 +1127,12 @@ public abstract class AbstractByteBuf extends ByteBuf {
 
     protected final void checkDstIndex(int index, int length, int dstIndex, int dstCapacity) {
         checkIndex(index, length);
-        if (isInvalid(dstIndex, length, dstCapacity)) {
+        if (isOutOfBounds(dstIndex, length, dstCapacity)) {
             throw new IndexOutOfBoundsException(String.format(
                     "dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dstCapacity));
         }
     }
 
-    static boolean isInvalid(int index, int length, int capacity) {
-        return (index | length | (index + length) | (capacity - (index + length))) < 0;
-    }
-
     /**
      * Throws an {@link IndexOutOfBoundsException} if the current
      * {@linkplain #readableBytes() readable bytes} of this buffer is less

buffer/src/main/java/io/netty/buffer/AbstractUnsafeSwappedByteBuf.java

@@ -19,6 +19,8 @@ import io.netty.util.internal.PlatformDependent;
 
 import java.nio.ByteOrder;
 
+import static io.netty.util.internal.PlatformDependent.BIG_ENDIAN_NATIVE_ORDER;
+
 /**
  * Special {@link SwappedByteBuf} for {@link ByteBuf}s that is using unsafe.
  */
@@ -30,7 +32,7 @@ abstract class AbstractUnsafeSwappedByteBuf extends SwappedByteBuf {
         super(buf);
         assert PlatformDependent.isUnaligned();
         wrapped = buf;
-        nativeByteOrder = UnsafeByteBufUtil.BIG_ENDIAN_NATIVE_ORDER == (order() == ByteOrder.BIG_ENDIAN);
+        nativeByteOrder = BIG_ENDIAN_NATIVE_ORDER == (order() == ByteOrder.BIG_ENDIAN);
     }
 
     @Override

buffer/src/main/java/io/netty/buffer/ByteBufUtil.java

@@ -15,11 +15,8 @@
  */
 package io.netty.buffer;
 
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
-
 import io.netty.util.AsciiString;
 import io.netty.util.ByteProcessor;
-import io.netty.util.ByteString;
 import io.netty.util.CharsetUtil;
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
@@ -41,6 +38,9 @@ import java.nio.charset.CoderResult;
 import java.util.Arrays;
 import java.util.Locale;
 
+import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.MathUtil.isOutOfBounds;
+
 /**
  * A collection of utility methods that is related with handling {@link ByteBuf},
  * such as the generation of hex dump and swapping an integer's byte order.
@@ -661,7 +661,7 @@ public final class ByteBufUtil {
      * The copy will start at {@link ByteBuf#readerIndex()} and copy {@link ByteBuf#readableBytes()} bytes.
      */
     public static byte[] getBytes(ByteBuf buf) {
-        return getBytes(buf, checkNotNull(buf, "buf").readerIndex(), buf.readableBytes());
+        return getBytes(buf,  buf.readerIndex(), buf.readableBytes());
     }
 
     /**
@@ -679,7 +679,7 @@ public final class ByteBufUtil {
      * If {@code copy} is false the underlying storage will be shared, if possible.
      */
     public static byte[] getBytes(ByteBuf buf, int start, int length, boolean copy) {
-        if (start < 0 || length > checkNotNull(buf, "buf").capacity() - start) {
+        if (isOutOfBounds(start, length, buf.capacity())) {
             throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= start + length(" + length
                     + ") <= " + "buf.capacity(" + buf.capacity() + ')');
         }
@@ -706,12 +706,10 @@ public final class ByteBufUtil {
      * @param dstIdx the starting offset in the destination byte array.
      * @param length the number of characters to copy.
      */
-    public static void copy(ByteString src, int srcIdx, ByteBuf dst, int dstIdx, int length) {
+    public static void copy(AsciiString src, int srcIdx, ByteBuf dst, int dstIdx, int length) {
-        final int thisLen = src.length();
+        if (isOutOfBounds(srcIdx, length, src.length())) {
-
-        if (srcIdx < 0 || length > thisLen - srcIdx) {
             throw new IndexOutOfBoundsException("expected: " + "0 <= srcIdx(" + srcIdx + ") <= srcIdx + length("
-                            + length + ") <= srcLen(" + thisLen + ')');
+                            + length + ") <= srcLen(" + src.length() + ')');
         }
 
         checkNotNull(dst, "dst").setBytes(dstIdx, src.array(), srcIdx + src.arrayOffset(), length);
@@ -724,12 +722,10 @@ public final class ByteBufUtil {
      * @param dst the destination byte array.
      * @param length the number of characters to copy.
      */
-    public static void copy(ByteString src, int srcIdx, ByteBuf dst, int length) {
+    public static void copy(AsciiString src, int srcIdx, ByteBuf dst, int length) {
-        final int thisLen = src.length();
+        if (isOutOfBounds(srcIdx, length, src.length())) {
-
-        if (srcIdx < 0 || length > thisLen - srcIdx) {
             throw new IndexOutOfBoundsException("expected: " + "0 <= srcIdx(" + srcIdx + ") <= srcIdx + length("
-                            + length + ") <= srcLen(" + thisLen + ')');
+                            + length + ") <= srcLen(" + src.length() + ')');
         }
 
         checkNotNull(dst, "dst").writeBytes(src.array(), srcIdx + src.arrayOffset(), length);
@@ -771,7 +767,7 @@ public final class ByteBufUtil {
      * the given {@code length}.
      */
     public static void appendPrettyHexDump(StringBuilder dump, ByteBuf buf, int offset, int length) {
-        if (offset < 0 || length  > checkNotNull(buf, "buf").capacity() - offset) {
+        if (isOutOfBounds(offset, length, buf.capacity())) {
             throw new IndexOutOfBoundsException(
                     "expected: " + "0 <= offset(" + offset + ") <= offset + length(" + length
                                                 + ") <= " + "buf.capacity(" + buf.capacity() + ')');

buffer/src/main/java/io/netty/buffer/UnsafeByteBufUtil.java

@@ -23,14 +23,14 @@ import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
+import static io.netty.util.internal.MathUtil.isOutOfBounds;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.PlatformDependent.BIG_ENDIAN_NATIVE_ORDER;
 
 /**
  * All operations get and set as {@link ByteOrder#BIG_ENDIAN}.
  */
 final class UnsafeByteBufUtil {
-
-    static final boolean BIG_ENDIAN_NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
     private static final boolean UNALIGNED = PlatformDependent.isUnaligned();
 
     static byte getByte(long address) {
@@ -282,7 +282,7 @@ final class UnsafeByteBufUtil {
     static void getBytes(AbstractByteBuf buf, long addr, int index, ByteBuf dst, int dstIndex, int length) {
         buf.checkIndex(index, length);
         checkNotNull(dst, "dst");
-        if (AbstractByteBuf.isInvalid(dstIndex, length, dst.capacity())) {
+        if (isOutOfBounds(dstIndex, length, dst.capacity())) {
             throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
         }
 
@@ -298,7 +298,7 @@ final class UnsafeByteBufUtil {
     static void getBytes(AbstractByteBuf buf, long addr, int index, byte[] dst, int dstIndex, int length) {
         buf.checkIndex(index, length);
         checkNotNull(dst, "dst");
-        if (AbstractByteBuf.isInvalid(dstIndex, length, dst.length)) {
+        if (isOutOfBounds(dstIndex, length, dst.length)) {
             throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
         }
         if (length != 0) {
@@ -328,7 +328,7 @@ final class UnsafeByteBufUtil {
     static void setBytes(AbstractByteBuf buf, long addr, int index, ByteBuf src, int srcIndex, int length) {
         buf.checkIndex(index, length);
         checkNotNull(src, "src");
-        if (AbstractByteBuf.isInvalid(srcIndex, length, src.capacity())) {
+        if (isOutOfBounds(srcIndex, length, src.capacity())) {
             throw new IndexOutOfBoundsException("srcIndex: " + srcIndex);
         }
 

codec-http/src/main/java/io/netty/handler/codec/http/CombinedHttpHeaders.java

@@ -36,7 +36,8 @@ public class CombinedHttpHeaders extends DefaultHttpHeaders {
         super(new CombinedHttpHeadersImpl(CASE_INSENSITIVE_HASHER, valueConverter(validate), nameValidator(validate)));
     }
 
-    private static final class CombinedHttpHeadersImpl extends DefaultHeaders<CharSequence> {
+    private static final class CombinedHttpHeadersImpl
+            extends DefaultHeaders<CharSequence, CharSequence, CombinedHttpHeadersImpl> {
         /**
          * An estimate of the size of a header value.
          */

codec-http/src/main/java/io/netty/handler/codec/http/DefaultHttpHeaders.java

@@ -18,6 +18,7 @@ package io.netty.handler.codec.http;
 import io.netty.handler.codec.CharSequenceValueConverter;
 import io.netty.handler.codec.DefaultHeaders;
 import io.netty.handler.codec.DefaultHeaders.NameValidator;
+import io.netty.handler.codec.DefaultHeadersImpl;
 import io.netty.handler.codec.HeadersUtils;
 import io.netty.handler.codec.ValueConverter;
 import io.netty.util.AsciiString;
@@ -36,7 +37,6 @@ import java.util.Set;
 
 import static io.netty.util.AsciiString.CASE_INSENSITIVE_HASHER;
 import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
 
 /**
  * Default implementation of {@link HttpHeaders}.
@@ -46,7 +46,7 @@ public class DefaultHttpHeaders extends HttpHeaders {
     private static final ByteProcessor HEADER_NAME_VALIDATOR = new ByteProcessor() {
         @Override
         public boolean process(byte value) throws Exception {
-            validateChar((char) (value & 0xFF));
+            validateHeaderNameElement(value);
             return true;
         }
     };
@@ -60,16 +60,15 @@ public class DefaultHttpHeaders extends HttpHeaders {
                     PlatformDependent.throwException(e);
                 }
             } else {
-                checkNotNull(name, "name");
                 // Go through each character in the name
                 for (int index = 0; index < name.length(); ++index) {
-                    validateChar(name.charAt(index));
+                    validateHeaderNameElement(name.charAt(index));
                 }
             }
         }
     };
 
-    private final DefaultHeaders<CharSequence> headers;
+    private final DefaultHeaders<CharSequence, CharSequence, ?> headers;
 
     public DefaultHttpHeaders() {
         this(true);
@@ -80,10 +79,12 @@ public class DefaultHttpHeaders extends HttpHeaders {
     }
 
     protected DefaultHttpHeaders(boolean validate, NameValidator<CharSequence> nameValidator) {
-        this(new DefaultHeaders<CharSequence>(CASE_INSENSITIVE_HASHER, valueConverter(validate), nameValidator));
+        this(new DefaultHeadersImpl<CharSequence, CharSequence>(CASE_INSENSITIVE_HASHER,
+                                                                valueConverter(validate),
+                                                                nameValidator));
     }
 
-    protected DefaultHttpHeaders(DefaultHeaders<CharSequence> headers) {
+    protected DefaultHttpHeaders(DefaultHeaders<CharSequence, CharSequence, ?> headers) {
         this.headers = headers;
     }
 
@@ -319,8 +320,9 @@ public class DefaultHttpHeaders extends HttpHeaders {
         return headers.hashCode(CASE_SENSITIVE_HASHER);
     }
 
-    private static void validateChar(char character) {
+    private static void validateHeaderNameElement(byte value) {
-        switch (character) {
+        switch (value) {
+        case 0x00:
         case '\t':
         case '\n':
         case 0x0b:
@@ -333,12 +335,37 @@ public class DefaultHttpHeaders extends HttpHeaders {
         case '=':
             throw new IllegalArgumentException(
                "a header name cannot contain the following prohibited characters: =,;: \\t\\r\\n\\v\\f: " +
-                       character);
+                       value);
         default:
             // Check to see if the character is not an ASCII character, or invalid
-            if (character > 127) {
+            if (value < 0) {
                 throw new IllegalArgumentException("a header name cannot contain non-ASCII character: " +
-                        character);
+                        value);
+            }
+        }
+    }
+
+    private static void validateHeaderNameElement(char value) {
+        switch (value) {
+        case 0x00:
+        case '\t':
+        case '\n':
+        case 0x0b:
+        case '\f':
+        case '\r':
+        case ' ':
+        case ',':
+        case ':':
+        case ';':
+        case '=':
+            throw new IllegalArgumentException(
+               "a header name cannot contain the following prohibited characters: =,;: \\t\\r\\n\\v\\f: " +
+                       value);
+        default:
+            // Check to see if the character is not an ASCII character, or invalid
+            if (value > 127) {
+                throw new IllegalArgumentException("a header name cannot contain non-ASCII character: " +
+                        value);
             }
         }
     }
@@ -357,13 +384,9 @@ public class DefaultHttpHeaders extends HttpHeaders {
 
         @Override
         public CharSequence convertObject(Object value) {
-            checkNotNull(value, "value");
             if (value instanceof CharSequence) {
                 return (CharSequence) value;
             }
-            if (value instanceof Number) {
-                return value.toString();
-            }
             if (value instanceof Date) {
                 return HttpHeaderDateFormat.get().format((Date) value);
             }

codec-http/src/main/java/io/netty/handler/codec/http/HttpHeadersEncoder.java

@@ -19,6 +19,7 @@ package io.netty.handler.codec.http;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufUtil;
 import io.netty.util.AsciiString;
+import static io.netty.util.AsciiString.c2b;
 
 final class HttpHeadersEncoder {
 
@@ -29,8 +30,8 @@ final class HttpHeadersEncoder {
         final int nameLen = name.length();
         final int valueLen = value.length();
         final int entryLen = nameLen + valueLen + 4;
-        int offset = buf.writerIndex();
         buf.ensureWritable(entryLen);
+        int offset = buf.writerIndex();
         writeAscii(buf, offset, name, nameLen);
         offset += nameLen;
         buf.setByte(offset ++, ':');
@@ -44,23 +45,15 @@ final class HttpHeadersEncoder {
 
     private static void writeAscii(ByteBuf buf, int offset, CharSequence value, int valueLen) {
         if (value instanceof AsciiString) {
-            writeAsciiString(buf, offset, (AsciiString) value, valueLen);
+            ByteBufUtil.copy((AsciiString) value, 0, buf, offset, valueLen);
         } else {
             writeCharSequence(buf, offset, value, valueLen);
         }
     }
 
-    private static void writeAsciiString(ByteBuf buf, int offset, AsciiString value, int valueLen) {
-        ByteBufUtil.copy(value, 0, buf, offset, valueLen);
-    }
-
     private static void writeCharSequence(ByteBuf buf, int offset, CharSequence value, int valueLen) {
-        for (int i = 0; i < valueLen; i ++) {
+        for (int i = 0; i < valueLen; ++i) {
             buf.setByte(offset ++, c2b(value.charAt(i)));
         }
     }
-
-    private static int c2b(char ch) {
-        return ch < 256? (byte) ch : '?';
-    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseStatus.java

@@ -19,7 +19,6 @@ import static io.netty.handler.codec.http.HttpConstants.SP;
 import io.netty.buffer.ByteBuf;
 import io.netty.util.AsciiString;
 import io.netty.util.ByteProcessor;
-import io.netty.util.ByteString;
 import io.netty.util.CharsetUtil;
 
 /**
@@ -471,7 +470,7 @@ public class HttpResponseStatus implements Comparable<HttpResponseStatus> {
 
     private static final class HttpStatusLineProcessor implements ByteProcessor {
         private static final byte ASCII_SPACE = (byte) ' ';
-        private final ByteString string;
+        private final AsciiString string;
         private int i;
         /**
          * 0 = New or havn't seen {@link ASCII_SPACE}.
@@ -482,7 +481,7 @@ public class HttpResponseStatus implements Comparable<HttpResponseStatus> {
         private int state;
         private HttpResponseStatus status;
 
-        public HttpStatusLineProcessor(ByteString string) {
+        public HttpStatusLineProcessor(AsciiString string) {
             this.string = string;
         }
 
@@ -506,7 +505,7 @@ public class HttpResponseStatus implements Comparable<HttpResponseStatus> {
         }
 
         private void parseStatus(int codeEnd) {
-            int code = string.parseAsciiInt(0, codeEnd);
+            int code = string.parseInt(0, codeEnd);
             status = valueOf(code);
             if (codeEnd < string.length()) {
                 String actualReason = string.toString(codeEnd + 1, string.length());
@@ -534,7 +533,7 @@ public class HttpResponseStatus implements Comparable<HttpResponseStatus> {
      *
      * @throws IllegalArgumentException if the specified status line is malformed
      */
-    public static HttpResponseStatus parseLine(ByteString line) {
+    public static HttpResponseStatus parseLine(AsciiString line) {
         try {
             HttpStatusLineProcessor processor = new HttpStatusLineProcessor(line);
             line.forEachByte(processor);

codec-http/src/main/java/io/netty/handler/codec/spdy/DefaultSpdyHeaders.java

@@ -17,7 +17,6 @@ package io.netty.handler.codec.spdy;
 
 import io.netty.handler.codec.CharSequenceValueConverter;
 import io.netty.handler.codec.DefaultHeaders;
-import io.netty.handler.codec.Headers;
 import io.netty.handler.codec.HeadersUtils;
 
 import java.util.Iterator;
@@ -27,7 +26,7 @@ import java.util.Map.Entry;
 import static io.netty.util.AsciiString.CASE_INSENSITIVE_HASHER;
 import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
 
-public class DefaultSpdyHeaders extends DefaultHeaders<CharSequence> implements SpdyHeaders {
+public class DefaultSpdyHeaders extends DefaultHeaders<CharSequence, CharSequence, SpdyHeaders> implements SpdyHeaders {
     private static final NameValidator<CharSequence> SpydNameValidator = new NameValidator<CharSequence>() {
         @Override
         public void validateName(CharSequence name) {
@@ -42,214 +41,10 @@ public class DefaultSpdyHeaders extends DefaultHeaders<CharSequence> implements
     @SuppressWarnings("unchecked")
     public DefaultSpdyHeaders(boolean validate) {
         super(CASE_INSENSITIVE_HASHER,
-                validate ? HeaderValueConverterAndValidator.INSTANCE : HeaderValueConverter.INSTANCE,
+                validate ? HeaderValueConverterAndValidator.INSTANCE : CharSequenceValueConverter.INSTANCE,
                 validate ? SpydNameValidator : NameValidator.NOT_NULL);
     }
 
-    @Override
-    public SpdyHeaders add(CharSequence name, CharSequence value) {
-        super.add(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders add(CharSequence name, Iterable<? extends CharSequence> values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders add(CharSequence name, CharSequence... values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addObject(CharSequence name, Object value) {
-        super.addObject(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addObject(CharSequence name, Iterable<?> values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addObject(CharSequence name, Object... values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addBoolean(CharSequence name, boolean value) {
-        super.addBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addChar(CharSequence name, char value) {
-        super.addChar(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addByte(CharSequence name, byte value) {
-        super.addByte(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addShort(CharSequence name, short value) {
-        super.addShort(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addInt(CharSequence name, int value) {
-        super.addInt(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addLong(CharSequence name, long value) {
-        super.addLong(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addFloat(CharSequence name, float value) {
-        super.addFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addDouble(CharSequence name, double value) {
-        super.addDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders addTimeMillis(CharSequence name, long value) {
-        super.addTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders add(Headers<? extends CharSequence> headers) {
-        super.add(headers);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders set(CharSequence name, CharSequence value) {
-        super.set(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders set(CharSequence name, Iterable<? extends CharSequence> values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders set(CharSequence name, CharSequence... values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setObject(CharSequence name, Object value) {
-        super.setObject(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setObject(CharSequence name, Iterable<?> values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setObject(CharSequence name, Object... values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setBoolean(CharSequence name, boolean value) {
-        super.setBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setChar(CharSequence name, char value) {
-        super.setChar(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setByte(CharSequence name, byte value) {
-        super.setByte(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setShort(CharSequence name, short value) {
-        super.setShort(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setInt(CharSequence name, int value) {
-        super.setInt(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setLong(CharSequence name, long value) {
-        super.setLong(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setFloat(CharSequence name, float value) {
-        super.setFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setDouble(CharSequence name, double value) {
-        super.setDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setTimeMillis(CharSequence name, long value) {
-        super.setTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders set(Headers<? extends CharSequence> headers) {
-        super.set(headers);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders setAll(Headers<? extends CharSequence> headers) {
-        super.setAll(headers);
-        return this;
-    }
-
-    @Override
-    public SpdyHeaders clear() {
-        super.clear();
-        return this;
-    }
-
     @Override
     public String getAsString(CharSequence name) {
         return HeadersUtils.getAsString(this, name);
@@ -276,23 +71,7 @@ public class DefaultSpdyHeaders extends DefaultHeaders<CharSequence> implements
                 ignoreCase ? CASE_INSENSITIVE_HASHER : CASE_SENSITIVE_HASHER);
     }
 
-    private static class HeaderValueConverter extends CharSequenceValueConverter {
+    private static final class HeaderValueConverterAndValidator extends CharSequenceValueConverter {
-        public static final HeaderValueConverter INSTANCE = new HeaderValueConverter();
-
-        @Override
-        public CharSequence convertObject(Object value) {
-            final CharSequence seq;
-            if (value instanceof CharSequence) {
-                seq = (CharSequence) value;
-            } else {
-                seq = value.toString();
-            }
-
-            return seq;
-        }
-    }
-
-    private static final class HeaderValueConverterAndValidator extends HeaderValueConverter {
         public static final HeaderValueConverterAndValidator INSTANCE = new HeaderValueConverterAndValidator();
 
         @Override

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeaderBlockRawEncoder.java

@@ -15,17 +15,15 @@
  */
 package io.netty.handler.codec.spdy;
 
-import static io.netty.handler.codec.spdy.SpdyCodecUtil.SPDY_MAX_NV_LENGTH;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.ByteBufUtil;
 import io.netty.buffer.Unpooled;
-import io.netty.util.AsciiString;
-import io.netty.util.ByteString;
-import io.netty.util.CharsetUtil;
 
 import java.util.Set;
 
+import static io.netty.handler.codec.spdy.SpdyCodecUtil.SPDY_MAX_NV_LENGTH;
+
 public class SpdyHeaderBlockRawEncoder extends SpdyHeaderBlockEncoder {
 
     private final int version;
@@ -59,18 +57,15 @@ public class SpdyHeaderBlockRawEncoder extends SpdyHeaderBlockEncoder {
         ByteBuf headerBlock = alloc.heapBuffer();
         writeLengthField(headerBlock, numHeaders);
         for (CharSequence name: names) {
-            final ByteString nameBytes = new ByteString(name, CharsetUtil.UTF_8);
+            writeLengthField(headerBlock, name.length());
-            int length = nameBytes.length();
+            ByteBufUtil.writeAscii(headerBlock, name);
-            writeLengthField(headerBlock, length);
-            ByteBufUtil.copy(nameBytes, 0, headerBlock, length);
             int savedIndex = headerBlock.writerIndex();
             int valueLength = 0;
             writeLengthField(headerBlock, valueLength);
             for (CharSequence value: frame.headers().getAll(name)) {
-                final ByteString valueBytes = new ByteString(value, CharsetUtil.UTF_8);
+                int length = value.length();
-                length = valueBytes.length();
                 if (length > 0) {
-                    ByteBufUtil.copy(valueBytes, 0, headerBlock, length);
+                    ByteBufUtil.writeAscii(headerBlock, value);
                     headerBlock.writeByte(0);
                     valueLength += length + 1;
                 }

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeaders.java

@@ -26,7 +26,7 @@ import java.util.Map.Entry;
  * Provides the constants for the standard SPDY HTTP header names and commonly
  * used utility methods that access a {@link SpdyHeadersFrame}.
  */
-public interface SpdyHeaders extends Headers<CharSequence> {
+public interface SpdyHeaders extends Headers<CharSequence, CharSequence, SpdyHeaders> {
 
     /**
      * SPDY HTTP header names
@@ -60,108 +60,6 @@ public interface SpdyHeaders extends Headers<CharSequence> {
         private HttpNames() { }
     }
 
-    @Override
-    SpdyHeaders add(CharSequence name, CharSequence value);
-
-    @Override
-    SpdyHeaders add(CharSequence name, Iterable<? extends CharSequence> values);
-
-    @Override
-    SpdyHeaders add(CharSequence name, CharSequence... values);
-
-    @Override
-    SpdyHeaders addObject(CharSequence name, Object value);
-
-    @Override
-    SpdyHeaders addObject(CharSequence name, Iterable<?> values);
-
-    @Override
-    SpdyHeaders addObject(CharSequence name, Object... values);
-
-    @Override
-    SpdyHeaders addBoolean(CharSequence name, boolean value);
-
-    @Override
-    SpdyHeaders addByte(CharSequence name, byte value);
-
-    @Override
-    SpdyHeaders addChar(CharSequence name, char value);
-
-    @Override
-    SpdyHeaders addShort(CharSequence name, short value);
-
-    @Override
-    SpdyHeaders addInt(CharSequence name, int value);
-
-    @Override
-    SpdyHeaders addLong(CharSequence name, long value);
-
-    @Override
-    SpdyHeaders addFloat(CharSequence name, float value);
-
-    @Override
-    SpdyHeaders addDouble(CharSequence name, double value);
-
-    @Override
-    SpdyHeaders addTimeMillis(CharSequence name, long value);
-
-    @Override
-    SpdyHeaders add(Headers<? extends CharSequence> headers);
-
-    @Override
-    SpdyHeaders set(CharSequence name, CharSequence value);
-
-    @Override
-    SpdyHeaders set(CharSequence name, Iterable<? extends CharSequence> values);
-
-    @Override
-    SpdyHeaders set(CharSequence name, CharSequence... values);
-
-    @Override
-    SpdyHeaders setBoolean(CharSequence name, boolean value);
-
-    @Override
-    SpdyHeaders setByte(CharSequence name, byte value);
-
-    @Override
-    SpdyHeaders setChar(CharSequence name, char value);
-
-    @Override
-    SpdyHeaders setShort(CharSequence name, short value);
-
-    @Override
-    SpdyHeaders setInt(CharSequence name, int value);
-
-    @Override
-    SpdyHeaders setLong(CharSequence name, long value);
-
-    @Override
-    SpdyHeaders setFloat(CharSequence name, float value);
-
-    @Override
-    SpdyHeaders setDouble(CharSequence name, double value);
-
-    @Override
-    SpdyHeaders setTimeMillis(CharSequence name, long value);
-
-    @Override
-    SpdyHeaders setObject(CharSequence name, Object value);
-
-    @Override
-    SpdyHeaders setObject(CharSequence name, Iterable<?> values);
-
-    @Override
-    SpdyHeaders setObject(CharSequence name, Object... values);
-
-    @Override
-    SpdyHeaders set(Headers<? extends CharSequence> headers);
-
-    @Override
-    SpdyHeaders setAll(Headers<? extends CharSequence> headers);
-
-    @Override
-    SpdyHeaders clear();
-
     /**
      * {@link Headers#get(Object)} and convert the result to a {@link String}.
      * @param name the name of the header to retrieve

codec-http2/src/main/java/io/netty/handler/codec/http2/CharSequenceMap.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.handler.codec.http2;
+
+import io.netty.handler.codec.DefaultHeaders;
+import io.netty.handler.codec.UnsupportedValueConverter;
+import io.netty.handler.codec.ValueConverter;
+
+import static io.netty.util.AsciiString.CASE_INSENSITIVE_HASHER;
+import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
+
+final class CharSequenceMap<V> extends DefaultHeaders<CharSequence, V, CharSequenceMap<V>> {
+    public CharSequenceMap() {
+        this(true);
+    }
+
+    public CharSequenceMap(boolean caseSensative) {
+        this(caseSensative, UnsupportedValueConverter.<V>instance());
+    }
+
+    public CharSequenceMap(boolean caseSensative, ValueConverter<V> valueConverter) {
+        super(caseSensative ? CASE_SENSITIVE_HASHER : CASE_INSENSITIVE_HASHER, valueConverter);
+    }
+}

codec-http2/src/main/java/io/netty/handler/codec/http2/CompressorHttp2ConnectionEncoder.java

@@ -14,13 +14,6 @@
  */
 package io.netty.handler.codec.http2;
 
-import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_ENCODING;
-import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
-import static io.netty.handler.codec.http.HttpHeaderValues.DEFLATE;
-import static io.netty.handler.codec.http.HttpHeaderValues.GZIP;
-import static io.netty.handler.codec.http.HttpHeaderValues.IDENTITY;
-import static io.netty.handler.codec.http.HttpHeaderValues.X_DEFLATE;
-import static io.netty.handler.codec.http.HttpHeaderValues.X_GZIP;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelFuture;
@@ -31,7 +24,14 @@ import io.netty.channel.embedded.EmbeddedChannel;
 import io.netty.handler.codec.ByteToMessageDecoder;
 import io.netty.handler.codec.compression.ZlibCodecFactory;
 import io.netty.handler.codec.compression.ZlibWrapper;
-import io.netty.util.ByteString;
+
+import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_ENCODING;
+import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
+import static io.netty.handler.codec.http.HttpHeaderValues.DEFLATE;
+import static io.netty.handler.codec.http.HttpHeaderValues.GZIP;
+import static io.netty.handler.codec.http.HttpHeaderValues.IDENTITY;
+import static io.netty.handler.codec.http.HttpHeaderValues.X_DEFLATE;
+import static io.netty.handler.codec.http.HttpHeaderValues.X_GZIP;
 
 /**
  * A decorating HTTP2 encoder that will compress data frames according to the {@code content-encoding} header for each
@@ -195,11 +195,11 @@ public class CompressorHttp2ConnectionEncoder extends DecoratingHttp2ConnectionE
      * (alternatively, you can throw a {@link Http2Exception} to block unknown encoding).
      * @throws Http2Exception If the specified encoding is not not supported and warrants an exception
      */
-    protected EmbeddedChannel newContentCompressor(ByteString contentEncoding) throws Http2Exception {
+    protected EmbeddedChannel newContentCompressor(CharSequence contentEncoding) throws Http2Exception {
-        if (GZIP.equals(contentEncoding) || X_GZIP.equals(contentEncoding)) {
+        if (GZIP.contentEqualsIgnoreCase(contentEncoding) || X_GZIP.contentEqualsIgnoreCase(contentEncoding)) {
             return newCompressionChannel(ZlibWrapper.GZIP);
         }
-        if (DEFLATE.equals(contentEncoding) || X_DEFLATE.equals(contentEncoding)) {
+        if (DEFLATE.contentEqualsIgnoreCase(contentEncoding) || X_DEFLATE.contentEqualsIgnoreCase(contentEncoding)) {
             return newCompressionChannel(ZlibWrapper.ZLIB);
         }
         // 'identity' or unsupported
@@ -214,7 +214,7 @@ public class CompressorHttp2ConnectionEncoder extends DecoratingHttp2ConnectionE
      * @return the expected content encoding of the new content.
      * @throws Http2Exception if the {@code contentEncoding} is not supported and warrants an exception
      */
-    protected ByteString getTargetContentEncoding(ByteString contentEncoding) throws Http2Exception {
+    protected CharSequence getTargetContentEncoding(CharSequence contentEncoding) throws Http2Exception {
         return contentEncoding;
     }
 
@@ -241,14 +241,14 @@ public class CompressorHttp2ConnectionEncoder extends DecoratingHttp2ConnectionE
             return null;
         }
 
-        ByteString encoding = headers.get(CONTENT_ENCODING);
+        CharSequence encoding = headers.get(CONTENT_ENCODING);
         if (encoding == null) {
             encoding = IDENTITY;
         }
         final EmbeddedChannel compressor = newContentCompressor(encoding);
         if (compressor != null) {
-            ByteString targetContentEncoding = getTargetContentEncoding(encoding);
+            CharSequence targetContentEncoding = getTargetContentEncoding(encoding);
-            if (IDENTITY.equals(targetContentEncoding)) {
+            if (IDENTITY.contentEqualsIgnoreCase(targetContentEncoding)) {
                 headers.remove(CONTENT_ENCODING);
             } else {
                 headers.set(CONTENT_ENCODING, targetContentEncoding);

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2HeaderTableListSize.java

@@ -14,9 +14,6 @@
  */
 package io.netty.handler.codec.http2;
 
-import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
-import static io.netty.handler.codec.http2.Http2Exception.connectionError;
-
 /**
  * Provides common functionality for {@link Http2HeaderTable}
  */

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2Headers.java

@@ -14,28 +14,32 @@
  */
 package io.netty.handler.codec.http2;
 
-import static io.netty.handler.codec.http2.Http2Exception.connectionError;
+import io.netty.handler.codec.CharSequenceValueConverter;
-import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
-import io.netty.handler.codec.ByteStringValueConverter;
 import io.netty.handler.codec.DefaultHeaders;
-import io.netty.handler.codec.Headers;
+import io.netty.util.AsciiString;
 import io.netty.util.ByteProcessor;
-import io.netty.util.ByteString;
 import io.netty.util.internal.PlatformDependent;
 
-public class DefaultHttp2Headers extends DefaultHeaders<ByteString> implements Http2Headers {
+import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
+import static io.netty.handler.codec.http2.Http2Exception.connectionError;
+import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
+import static io.netty.util.AsciiString.isUpperCase;
+
+public class DefaultHttp2Headers
+        extends DefaultHeaders<CharSequence, CharSequence, Http2Headers> implements Http2Headers {
     private static final ByteProcessor HTTP2_NAME_VALIDATOR_PROCESSOR = new ByteProcessor() {
         @Override
         public boolean process(byte value) throws Exception {
-            return value < 'A' || value > 'Z';
+            return !isUpperCase(value);
         }
     };
-    private static final NameValidator<ByteString> HTTP2_NAME_VALIDATOR = new NameValidator<ByteString>() {
+    private static final NameValidator<CharSequence> HTTP2_NAME_VALIDATOR = new NameValidator<CharSequence>() {
         @Override
-        public void validateName(ByteString name) {
+        public void validateName(CharSequence name) {
+            if (name instanceof AsciiString) {
                 final int index;
                 try {
-                index = name.forEachByte(HTTP2_NAME_VALIDATOR_PROCESSOR);
+                    index = ((AsciiString) name).forEachByte(HTTP2_NAME_VALIDATOR_PROCESSOR);
                 } catch (Http2Exception e) {
                     PlatformDependent.throwException(e);
                     return;
@@ -46,11 +50,21 @@ public class DefaultHttp2Headers extends DefaultHeaders<ByteString> implements H
                 }
 
                 if (index != -1) {
-                PlatformDependent.throwException(connectionError(PROTOCOL_ERROR, "invalid header name [%s]", name));
+                    PlatformDependent.throwException(connectionError(PROTOCOL_ERROR,
+                            "invalid header name [%s]", name));
+                }
+            } else {
+                for (int i = 0; i < name.length(); ++i) {
+                    if (isUpperCase(name.charAt(i))) {
+                        PlatformDependent.throwException(connectionError(PROTOCOL_ERROR,
+                                "invalid header name [%s]", name));
+                    }
+                }
             }
         }
     };
-    private HeaderEntry<ByteString> firstNonPseudo = head;
+
+    private HeaderEntry<CharSequence, CharSequence> firstNonPseudo = head;
 
     /**
      * Create a new instance.
@@ -69,282 +83,83 @@ public class DefaultHttp2Headers extends DefaultHeaders<ByteString> implements H
      */
     @SuppressWarnings("unchecked")
     public DefaultHttp2Headers(boolean validate) {
-        super(ByteStringValueConverter.INSTANCE, validate ? HTTP2_NAME_VALIDATOR : NameValidator.NOT_NULL);
+        // Case sensitive compare is used because it is cheaper, and header validation can be used to catch invalid
+        // headers.
+        super(CASE_SENSITIVE_HASHER,
+              CharSequenceValueConverter.INSTANCE,
+              validate ? HTTP2_NAME_VALIDATOR : NameValidator.NOT_NULL);
     }
 
     @Override
-    public Http2Headers add(ByteString name, ByteString value) {
+    public Http2Headers method(CharSequence value) {
-        super.add(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(ByteString name, Iterable<? extends ByteString> values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(ByteString name, ByteString... values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Object value) {
-        super.addObject(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Iterable<?> values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Object... values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addBoolean(ByteString name, boolean value) {
-        super.addBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addChar(ByteString name, char value) {
-        super.addChar(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addByte(ByteString name, byte value) {
-        super.addByte(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addShort(ByteString name, short value) {
-        super.addShort(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addInt(ByteString name, int value) {
-        super.addInt(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addLong(ByteString name, long value) {
-        super.addLong(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addFloat(ByteString name, float value) {
-        super.addFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addDouble(ByteString name, double value) {
-        super.addDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addTimeMillis(ByteString name, long value) {
-        super.addTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(Headers<? extends ByteString> headers) {
-        super.add(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, ByteString value) {
-        super.set(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, Iterable<? extends ByteString> values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, ByteString... values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Object value) {
-        super.setObject(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Iterable<?> values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Object... values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setBoolean(ByteString name, boolean value) {
-        super.setBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setChar(ByteString name, char value) {
-        super.setChar(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setByte(ByteString name, byte value) {
-        super.setByte(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setShort(ByteString name, short value) {
-        super.setShort(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setInt(ByteString name, int value) {
-        super.setInt(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setLong(ByteString name, long value) {
-        super.setLong(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setFloat(ByteString name, float value) {
-        super.setFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setDouble(ByteString name, double value) {
-        super.setDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setTimeMillis(ByteString name, long value) {
-        super.setTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(Headers<? extends ByteString> headers) {
-        super.set(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setAll(Headers<? extends ByteString> headers) {
-        super.setAll(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers clear() {
-        super.clear();
-        return this;
-    }
-
-    @Override
-    public Http2Headers method(ByteString value) {
         set(PseudoHeaderName.METHOD.value(), value);
         return this;
     }
 
     @Override
-    public Http2Headers scheme(ByteString value) {
+    public Http2Headers scheme(CharSequence value) {
         set(PseudoHeaderName.SCHEME.value(), value);
         return this;
     }
 
     @Override
-    public Http2Headers authority(ByteString value) {
+    public Http2Headers authority(CharSequence value) {
         set(PseudoHeaderName.AUTHORITY.value(), value);
         return this;
     }
 
     @Override
-    public Http2Headers path(ByteString value) {
+    public Http2Headers path(CharSequence value) {
         set(PseudoHeaderName.PATH.value(), value);
         return this;
     }
 
     @Override
-    public Http2Headers status(ByteString value) {
+    public Http2Headers status(CharSequence value) {
         set(PseudoHeaderName.STATUS.value(), value);
         return this;
     }
 
     @Override
-    public ByteString method() {
+    public CharSequence method() {
         return get(PseudoHeaderName.METHOD.value());
     }
 
     @Override
-    public ByteString scheme() {
+    public CharSequence scheme() {
         return get(PseudoHeaderName.SCHEME.value());
     }
 
     @Override
-    public ByteString authority() {
+    public CharSequence authority() {
         return get(PseudoHeaderName.AUTHORITY.value());
     }
 
     @Override
-    public ByteString path() {
+    public CharSequence path() {
         return get(PseudoHeaderName.PATH.value());
     }
 
     @Override
-    public ByteString status() {
+    public CharSequence status() {
         return get(PseudoHeaderName.STATUS.value());
     }
 
     @Override
-    protected final HeaderEntry<ByteString> newHeaderEntry(int h, ByteString name, ByteString value,
+    protected final HeaderEntry<CharSequence, CharSequence> newHeaderEntry(int h, CharSequence name, CharSequence value,
-                                                           HeaderEntry<ByteString> next) {
+                                                           HeaderEntry<CharSequence, CharSequence> next) {
         return new Http2HeaderEntry(h, name, value, next);
     }
 
-    private final class Http2HeaderEntry extends HeaderEntry<ByteString> {
+    private final class Http2HeaderEntry extends HeaderEntry<CharSequence, CharSequence> {
-        protected Http2HeaderEntry(int hash, ByteString key, ByteString value, HeaderEntry<ByteString> next) {
+        protected Http2HeaderEntry(int hash, CharSequence key, CharSequence value,
+                HeaderEntry<CharSequence, CharSequence> next) {
             super(hash, key);
             this.value = value;
             this.next = next;
 
             // Make sure the pseudo headers fields are first in iteration order
-            if (!key.isEmpty() && key.byteAt(0) == ':') {
+            if (key.length() != 0 && key.charAt(0) == ':') {
                 after = firstNonPseudo;
                 before = firstNonPseudo.before();
             } else {

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2HeadersDecoder.java

@@ -15,6 +15,15 @@
 
 package io.netty.handler.codec.http2;
 
+import com.twitter.hpack.Decoder;
+import com.twitter.hpack.HeaderListener;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufInputStream;
+import io.netty.util.AsciiString;
+
+import java.io.IOException;
+import java.io.InputStream;
+
 import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_HEADER_TABLE_SIZE;
 import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_MAX_HEADER_SIZE;
 import static io.netty.handler.codec.http2.Http2Error.COMPRESSION_ERROR;
@@ -22,15 +31,6 @@ import static io.netty.handler.codec.http2.Http2Error.ENHANCE_YOUR_CALM;
 import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
 import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
-import io.netty.buffer.ByteBuf;
-import io.netty.buffer.ByteBufInputStream;
-import io.netty.util.ByteString;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import com.twitter.hpack.Decoder;
-import com.twitter.hpack.HeaderListener;
 
 public class DefaultHttp2HeadersDecoder implements Http2HeadersDecoder, Http2HeadersDecoder.Configuration {
     private final int maxHeaderSize;
@@ -91,7 +91,7 @@ public class DefaultHttp2HeadersDecoder implements Http2HeadersDecoder, Http2Hea
             HeaderListener listener = new HeaderListener() {
                 @Override
                 public void addHeader(byte[] key, byte[] value, boolean sensitive) {
-                    headers.add(new ByteString(key, false), new ByteString(value, false));
+                    headers.add(new AsciiString(key, false), new AsciiString(value, false));
                 }
             };
 

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2HeadersEncoder.java

@@ -15,22 +15,22 @@
 
 package io.netty.handler.codec.http2;
 
-import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_HEADER_TABLE_SIZE;
+import com.twitter.hpack.Encoder;
-import static io.netty.handler.codec.http2.Http2Error.COMPRESSION_ERROR;
-import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
-import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
-import static io.netty.handler.codec.http2.Http2Exception.connectionError;
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufOutputStream;
-import io.netty.util.ByteString;
+import io.netty.util.AsciiString;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Map.Entry;
 
-import com.twitter.hpack.Encoder;
+import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_HEADER_TABLE_SIZE;
+import static io.netty.handler.codec.http2.Http2Error.COMPRESSION_ERROR;
+import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
+import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
+import static io.netty.handler.codec.http2.Http2Exception.connectionError;
+import static io.netty.util.internal.ObjectUtil.checkNotNull;
 
 public class DefaultHttp2HeadersEncoder implements Http2HeadersEncoder, Http2HeadersEncoder.Configuration {
     private final Encoder encoder;
@@ -64,7 +64,7 @@ public class DefaultHttp2HeadersEncoder implements Http2HeadersEncoder, Http2Hea
                 tableSizeChangeOutput.reset();
             }
 
-            for (Entry<ByteString, ByteString> header : headers) {
+            for (Entry<CharSequence, CharSequence> header : headers) {
                 encodeHeader(header.getKey(), header.getValue(), stream);
             }
         } catch (Http2Exception e) {
@@ -90,11 +90,13 @@ public class DefaultHttp2HeadersEncoder implements Http2HeadersEncoder, Http2Hea
         return this;
     }
 
-    private void encodeHeader(ByteString key, ByteString value, OutputStream stream) throws IOException {
+    private byte[] toBytes(CharSequence chars) {
-        encoder.encodeHeader(stream,
+        AsciiString aString = AsciiString.of(chars);
-                key.isEntireArrayUsed() ? key.array() : new ByteString(key, true).array(),
+        return aString.isEntireArrayUsed() ? aString.array() : aString.toByteArray();
-                value.isEntireArrayUsed() ? value.array() : new ByteString(value, true).array(),
+    }
-                sensitivityDetector.isSensitive(key, value));
+
+    private void encodeHeader(CharSequence key, CharSequence value, OutputStream stream) throws IOException {
+        encoder.encodeHeader(stream, toBytes(key), toBytes(value), sensitivityDetector.isSensitive(key, value));
     }
 
     /**

codec-http2/src/main/java/io/netty/handler/codec/http2/DelegatingDecompressorFrameListener.java

@@ -14,6 +14,14 @@
  */
 package io.netty.handler.codec.http2;
 
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.embedded.EmbeddedChannel;
+import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.compression.ZlibCodecFactory;
+import io.netty.handler.codec.compression.ZlibWrapper;
+
 import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_ENCODING;
 import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
 import static io.netty.handler.codec.http.HttpHeaderValues.DEFLATE;
@@ -24,14 +32,6 @@ import static io.netty.handler.codec.http.HttpHeaderValues.X_GZIP;
 import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.streamError;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
-import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.embedded.EmbeddedChannel;
-import io.netty.handler.codec.ByteToMessageDecoder;
-import io.netty.handler.codec.compression.ZlibCodecFactory;
-import io.netty.handler.codec.compression.ZlibWrapper;
-import io.netty.util.ByteString;
 
 /**
  * A HTTP2 frame listener that will decompress data frames according to the {@code content-encoding} header for each
@@ -160,11 +160,11 @@ public class DelegatingDecompressorFrameListener extends Http2FrameListenerDecor
      *         (alternatively, you can throw a {@link Http2Exception} to block unknown encoding).
      * @throws Http2Exception If the specified encoding is not not supported and warrants an exception
      */
-    protected EmbeddedChannel newContentDecompressor(ByteString contentEncoding) throws Http2Exception {
+    protected EmbeddedChannel newContentDecompressor(CharSequence contentEncoding) throws Http2Exception {
-        if (GZIP.equals(contentEncoding) || X_GZIP.equals(contentEncoding)) {
+        if (GZIP.contentEqualsIgnoreCase(contentEncoding) || X_GZIP.contentEqualsIgnoreCase(contentEncoding)) {
             return new EmbeddedChannel(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
         }
-        if (DEFLATE.equals(contentEncoding) || X_DEFLATE.equals(contentEncoding)) {
+        if (DEFLATE.contentEqualsIgnoreCase(contentEncoding) || X_DEFLATE.contentEqualsIgnoreCase(contentEncoding)) {
             final ZlibWrapper wrapper = strict ? ZlibWrapper.ZLIB : ZlibWrapper.ZLIB_OR_NONE;
             // To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
             return new EmbeddedChannel(ZlibCodecFactory.newZlibDecoder(wrapper));
@@ -181,7 +181,7 @@ public class DelegatingDecompressorFrameListener extends Http2FrameListenerDecor
      * @return the expected content encoding of the new content.
      * @throws Http2Exception if the {@code contentEncoding} is not supported and warrants an exception
      */
-    protected ByteString getTargetContentEncoding(@SuppressWarnings("UnusedParameters") ByteString contentEncoding)
+    protected CharSequence getTargetContentEncoding(@SuppressWarnings("UnusedParameters") CharSequence contentEncoding)
                     throws Http2Exception {
         return IDENTITY;
     }
@@ -204,7 +204,7 @@ public class DelegatingDecompressorFrameListener extends Http2FrameListenerDecor
         Http2Decompressor decompressor = decompressor(stream);
         if (decompressor == null && !endOfStream) {
             // Determine the content encoding.
-            ByteString contentEncoding = headers.get(CONTENT_ENCODING);
+            CharSequence contentEncoding = headers.get(CONTENT_ENCODING);
             if (contentEncoding == null) {
                 contentEncoding = IDENTITY;
             }
@@ -214,8 +214,8 @@ public class DelegatingDecompressorFrameListener extends Http2FrameListenerDecor
                 stream.setProperty(propertyKey, decompressor);
                 // Decode the content and remove or replace the existing headers
                 // so that the message looks like a decoded message.
-                ByteString targetContentEncoding = getTargetContentEncoding(contentEncoding);
+                CharSequence targetContentEncoding = getTargetContentEncoding(contentEncoding);
-                if (IDENTITY.equals(targetContentEncoding)) {
+                if (IDENTITY.contentEqualsIgnoreCase(targetContentEncoding)) {
                     headers.remove(CONTENT_ENCODING);
                 } else {
                     headers.set(CONTENT_ENCODING, targetContentEncoding);

codec-http2/src/main/java/io/netty/handler/codec/http2/EmptyHttp2Headers.java

@@ -16,266 +16,61 @@
 package io.netty.handler.codec.http2;
 
 import io.netty.handler.codec.EmptyHeaders;
-import io.netty.handler.codec.Headers;
-import io.netty.util.ByteString;
 
-public final class EmptyHttp2Headers extends EmptyHeaders<ByteString> implements Http2Headers {
+public final class EmptyHttp2Headers
+        extends EmptyHeaders<CharSequence, CharSequence, Http2Headers> implements Http2Headers {
     public static final EmptyHttp2Headers INSTANCE = new EmptyHttp2Headers();
 
     private EmptyHttp2Headers() {
     }
 
     @Override
-    public Http2Headers add(ByteString name, ByteString value) {
+    public EmptyHttp2Headers method(CharSequence method) {
-        super.add(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(ByteString name, Iterable<? extends ByteString> values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(ByteString name, ByteString... values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Object value) {
-        super.addObject(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Iterable<?> values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addObject(ByteString name, Object... values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addBoolean(ByteString name, boolean value) {
-        super.addBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addChar(ByteString name, char value) {
-        super.addChar(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addByte(ByteString name, byte value) {
-        super.addByte(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addShort(ByteString name, short value) {
-        super.addShort(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addInt(ByteString name, int value) {
-        super.addInt(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addLong(ByteString name, long value) {
-        super.addLong(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addFloat(ByteString name, float value) {
-        super.addFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addDouble(ByteString name, double value) {
-        super.addDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers addTimeMillis(ByteString name, long value) {
-        super.addTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers add(Headers<? extends ByteString> headers) {
-        super.add(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, ByteString value) {
-        super.set(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, Iterable<? extends ByteString> values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(ByteString name, ByteString... values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Object value) {
-        super.setObject(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Iterable<?> values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setObject(ByteString name, Object... values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setBoolean(ByteString name, boolean value) {
-        super.setBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setChar(ByteString name, char value) {
-        super.setChar(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setByte(ByteString name, byte value) {
-        super.setByte(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setShort(ByteString name, short value) {
-        super.setShort(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setInt(ByteString name, int value) {
-        super.setInt(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setLong(ByteString name, long value) {
-        super.setLong(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setFloat(ByteString name, float value) {
-        super.setFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setDouble(ByteString name, double value) {
-        super.setDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setTimeMillis(ByteString name, long value) {
-        super.setTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public Http2Headers set(Headers<? extends ByteString> headers) {
-        super.set(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers setAll(Headers<? extends ByteString> headers) {
-        super.setAll(headers);
-        return this;
-    }
-
-    @Override
-    public Http2Headers clear() {
-        super.clear();
-        return this;
-    }
-
-    @Override
-    public EmptyHttp2Headers method(ByteString method) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public EmptyHttp2Headers scheme(ByteString status) {
+    public EmptyHttp2Headers scheme(CharSequence status) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public EmptyHttp2Headers authority(ByteString authority) {
+    public EmptyHttp2Headers authority(CharSequence authority) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public EmptyHttp2Headers path(ByteString path) {
+    public EmptyHttp2Headers path(CharSequence path) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public EmptyHttp2Headers status(ByteString status) {
+    public EmptyHttp2Headers status(CharSequence status) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public ByteString method() {
+    public CharSequence method() {
         return get(PseudoHeaderName.METHOD.value());
     }
 
     @Override
-    public ByteString scheme() {
+    public CharSequence scheme() {
         return get(PseudoHeaderName.SCHEME.value());
     }
 
     @Override
-    public ByteString authority() {
+    public CharSequence authority() {
         return get(PseudoHeaderName.AUTHORITY.value());
     }
 
     @Override
-    public ByteString path() {
+    public CharSequence path() {
         return get(PseudoHeaderName.PATH.value());
     }
 
     @Override
-    public ByteString status() {
+    public CharSequence status() {
         return get(PseudoHeaderName.STATUS.value());
     }
 }

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2Headers.java

@@ -15,19 +15,16 @@
 
 package io.netty.handler.codec.http2;
 
-import java.util.HashSet;
+import io.netty.handler.codec.Headers;
+import io.netty.util.AsciiString;
+
 import java.util.Iterator;
 import java.util.Map.Entry;
-import java.util.Set;
-
-import io.netty.handler.codec.Headers;
-import io.netty.util.ByteString;
-import io.netty.util.CharsetUtil;
 
 /**
  * A collection of headers sent or received via HTTP/2.
  */
-public interface Http2Headers extends Headers<ByteString> {
+public interface Http2Headers extends Headers<CharSequence, CharSequence, Http2Headers> {
 
     /**
      * HTTP/2 pseudo-headers names.
@@ -58,19 +55,19 @@ public interface Http2Headers extends Headers<ByteString> {
          */
         STATUS(":status");
 
-        private final ByteString value;
+        private final AsciiString value;
-        private static final Set<ByteString> PSEUDO_HEADERS = new HashSet<ByteString>();
+        private static final CharSequenceMap<AsciiString> PSEUDO_HEADERS = new CharSequenceMap<AsciiString>();
         static {
             for (PseudoHeaderName pseudoHeader : PseudoHeaderName.values()) {
-                PSEUDO_HEADERS.add(pseudoHeader.value());
+                PSEUDO_HEADERS.add(pseudoHeader.value(), AsciiString.EMPTY_STRING);
             }
         }
 
         PseudoHeaderName(String value) {
-            this.value = new ByteString(value, CharsetUtil.UTF_8);
+            this.value = new AsciiString(value);
         }
 
-        public ByteString value() {
+        public AsciiString value() {
             // Return a slice so that the buffer gets its own reader index.
             return value;
         }
@@ -78,168 +75,66 @@ public interface Http2Headers extends Headers<ByteString> {
         /**
          * Indicates whether the given header name is a valid HTTP/2 pseudo header.
          */
-        public static boolean isPseudoHeader(ByteString header) {
+        public static boolean isPseudoHeader(CharSequence header) {
             return PSEUDO_HEADERS.contains(header);
         }
     }
 
-    @Override
-    Http2Headers add(ByteString name, ByteString value);
-
-    @Override
-    Http2Headers add(ByteString name, Iterable<? extends ByteString> values);
-
-    @Override
-    Http2Headers add(ByteString name, ByteString... values);
-
-    @Override
-    Http2Headers addObject(ByteString name, Object value);
-
-    @Override
-    Http2Headers addObject(ByteString name, Iterable<?> values);
-
-    @Override
-    Http2Headers addObject(ByteString name, Object... values);
-
-    @Override
-    Http2Headers addBoolean(ByteString name, boolean value);
-
-    @Override
-    Http2Headers addByte(ByteString name, byte value);
-
-    @Override
-    Http2Headers addChar(ByteString name, char value);
-
-    @Override
-    Http2Headers addShort(ByteString name, short value);
-
-    @Override
-    Http2Headers addInt(ByteString name, int value);
-
-    @Override
-    Http2Headers addLong(ByteString name, long value);
-
-    @Override
-    Http2Headers addFloat(ByteString name, float value);
-
-    @Override
-    Http2Headers addDouble(ByteString name, double value);
-
-    @Override
-    Http2Headers addTimeMillis(ByteString name, long value);
-
-    @Override
-    Http2Headers add(Headers<? extends ByteString> headers);
-
-    @Override
-    Http2Headers set(ByteString name, ByteString value);
-
-    @Override
-    Http2Headers set(ByteString name, Iterable<? extends ByteString> values);
-
-    @Override
-    Http2Headers set(ByteString name, ByteString... values);
-
-    @Override
-    Http2Headers setObject(ByteString name, Object value);
-
-    @Override
-    Http2Headers setObject(ByteString name, Iterable<?> values);
-
-    @Override
-    Http2Headers setObject(ByteString name, Object... values);
-
-    @Override
-    Http2Headers setBoolean(ByteString name, boolean value);
-
-    @Override
-    Http2Headers setByte(ByteString name, byte value);
-
-    @Override
-    Http2Headers setChar(ByteString name, char value);
-
-    @Override
-    Http2Headers setShort(ByteString name, short value);
-
-    @Override
-    Http2Headers setInt(ByteString name, int value);
-
-    @Override
-    Http2Headers setLong(ByteString name, long value);
-
-    @Override
-    Http2Headers setFloat(ByteString name, float value);
-
-    @Override
-    Http2Headers setDouble(ByteString name, double value);
-
-    @Override
-    Http2Headers setTimeMillis(ByteString name, long value);
-
-    @Override
-    Http2Headers set(Headers<? extends ByteString> headers);
-
-    @Override
-    Http2Headers setAll(Headers<? extends ByteString> headers);
-
-    @Override
-    Http2Headers clear();
-
     /**
      * Returns an iterator over all HTTP/2 headers. The iteration order is as follows:
      *   1. All pseudo headers (order not specified).
      *   2. All non-pseudo headers (in insertion order).
      */
     @Override
-    Iterator<Entry<ByteString, ByteString>> iterator();
+    Iterator<Entry<CharSequence, CharSequence>> iterator();
 
     /**
      * Sets the {@link PseudoHeaderName#METHOD} header or {@code null} if there is no such header
      */
-    Http2Headers method(ByteString value);
+    Http2Headers method(CharSequence value);
 
     /**
      * Sets the {@link PseudoHeaderName#SCHEME} header if there is no such header
      */
-    Http2Headers scheme(ByteString value);
+    Http2Headers scheme(CharSequence value);
 
     /**
      * Sets the {@link PseudoHeaderName#AUTHORITY} header or {@code null} if there is no such header
      */
-    Http2Headers authority(ByteString value);
+    Http2Headers authority(CharSequence value);
 
     /**
      * Sets the {@link PseudoHeaderName#PATH} header or {@code null} if there is no such header
      */
-    Http2Headers path(ByteString value);
+    Http2Headers path(CharSequence value);
 
     /**
      * Sets the {@link PseudoHeaderName#STATUS} header or {@code null} if there is no such header
      */
-    Http2Headers status(ByteString value);
+    Http2Headers status(CharSequence value);
 
     /**
      * Gets the {@link PseudoHeaderName#METHOD} header or {@code null} if there is no such header
      */
-    ByteString method();
+    CharSequence method();
 
     /**
      * Gets the {@link PseudoHeaderName#SCHEME} header or {@code null} if there is no such header
      */
-    ByteString scheme();
+    CharSequence scheme();
 
     /**
      * Gets the {@link PseudoHeaderName#AUTHORITY} header or {@code null} if there is no such header
      */
-    ByteString authority();
+    CharSequence authority();
 
     /**
      * Gets the {@link PseudoHeaderName#PATH} header or {@code null} if there is no such header
      */
-    ByteString path();
+    CharSequence path();
 
     /**
      * Gets the {@link PseudoHeaderName#STATUS} header or {@code null} if there is no such header
      */
-    ByteString status();
+    CharSequence status();
 }

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2HeadersEncoder.java

@@ -16,7 +16,6 @@
 package io.netty.handler.codec.http2;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.util.ByteString;
 
 /**
  * Encodes {@link Http2Headers} into HPACK-encoded headers blocks.
@@ -47,7 +46,7 @@ public interface Http2HeadersEncoder {
          * <a href="http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-12#section-7.1.3">sensitive</a>.
          * {@code false} otherwise.
          */
-        boolean isSensitive(ByteString name, ByteString value);
+        boolean isSensitive(CharSequence name, CharSequence value);
     }
 
     /**
@@ -68,7 +67,7 @@ public interface Http2HeadersEncoder {
      */
     SensitivityDetector NEVER_SENSITIVE = new SensitivityDetector() {
         @Override
-        public boolean isSensitive(ByteString name, ByteString value) {
+        public boolean isSensitive(CharSequence name, CharSequence value) {
             return false;
         }
     };

codec-http2/src/main/java/io/netty/handler/codec/http2/HttpConversionUtil.java

@@ -20,7 +20,6 @@ import io.netty.handler.codec.http.FullHttpMessage;
 import io.netty.handler.codec.http.FullHttpRequest;
 import io.netty.handler.codec.http.FullHttpResponse;
 import io.netty.handler.codec.http.HttpHeaderNames;
-import io.netty.handler.codec.http.HttpUtil;
 import io.netty.handler.codec.http.HttpHeaderValues;
 import io.netty.handler.codec.http.HttpHeaders;
 import io.netty.handler.codec.http.HttpMessage;
@@ -28,17 +27,13 @@ import io.netty.handler.codec.http.HttpMethod;
 import io.netty.handler.codec.http.HttpRequest;
 import io.netty.handler.codec.http.HttpResponse;
 import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpUtil;
 import io.netty.handler.codec.http.HttpVersion;
 import io.netty.util.AsciiString;
-import io.netty.util.ByteString;
 
 import java.net.URI;
-import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Iterator;
-import java.util.Map;
 import java.util.Map.Entry;
-import java.util.Set;
 
 import static io.netty.handler.codec.http.HttpScheme.HTTP;
 import static io.netty.handler.codec.http.HttpScheme.HTTPS;
@@ -47,6 +42,7 @@ import static io.netty.handler.codec.http.HttpUtil.isOriginForm;
 import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
 import static io.netty.handler.codec.http2.Http2Exception.streamError;
+import static io.netty.util.AsciiString.EMPTY_STRING;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
 import static io.netty.util.internal.StringUtil.isNullOrEmpty;
 import static io.netty.util.internal.StringUtil.length;
@@ -58,21 +54,23 @@ public final class HttpConversionUtil {
     /**
      * The set of headers that should not be directly copied when converting headers from HTTP to HTTP/2.
      */
+    private static final CharSequenceMap<AsciiString> HTTP_TO_HTTP2_HEADER_BLACKLIST =
+            new CharSequenceMap<AsciiString>();
+    static {
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(HttpHeaderNames.CONNECTION, EMPTY_STRING);
         @SuppressWarnings("deprecation")
-    private static final Set<CharSequence> HTTP_TO_HTTP2_HEADER_BLACKLIST = new HashSet<CharSequence>() {
+        AsciiString keepAlive = HttpHeaderNames.KEEP_ALIVE;
-        private static final long serialVersionUID = -5678614530214167043L;
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(keepAlive, EMPTY_STRING);
-        {
+        @SuppressWarnings("deprecation")
-            add(HttpHeaderNames.CONNECTION);
+        AsciiString proxyConnection = HttpHeaderNames.PROXY_CONNECTION;
-            add(HttpHeaderNames.KEEP_ALIVE);
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(proxyConnection, EMPTY_STRING);
-            add(HttpHeaderNames.PROXY_CONNECTION);
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(HttpHeaderNames.TRANSFER_ENCODING, EMPTY_STRING);
-            add(HttpHeaderNames.TRANSFER_ENCODING);
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(HttpHeaderNames.HOST, EMPTY_STRING);
-            add(HttpHeaderNames.HOST);
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(HttpHeaderNames.UPGRADE, EMPTY_STRING);
-            add(HttpHeaderNames.UPGRADE);
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(ExtensionHeaderNames.STREAM_ID.text(), EMPTY_STRING);
-            add(ExtensionHeaderNames.STREAM_ID.text());
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(ExtensionHeaderNames.SCHEME.text(), EMPTY_STRING);
-            add(ExtensionHeaderNames.SCHEME.text());
+        HTTP_TO_HTTP2_HEADER_BLACKLIST.add(ExtensionHeaderNames.PATH.text(), EMPTY_STRING);
-            add(ExtensionHeaderNames.PATH.text());
     }
-    };
 
     /**
      * This will be the method used for {@link HttpRequest} objects generated out of the HTTP message flow defined in <a
@@ -166,7 +164,7 @@ public final class HttpConversionUtil {
      * @return The HTTP/1.x status
      * @throws Http2Exception If there is a problem translating from HTTP/2 to HTTP/1.x
      */
-    public static HttpResponseStatus parseStatus(ByteString status) throws Http2Exception {
+    public static HttpResponseStatus parseStatus(CharSequence status) throws Http2Exception {
         HttpResponseStatus result;
         try {
             result = HttpResponseStatus.parseLine(status);
@@ -219,9 +217,9 @@ public final class HttpConversionUtil {
     public static FullHttpRequest toHttpRequest(int streamId, Http2Headers http2Headers, boolean validateHttpHeaders)
                     throws Http2Exception {
         // HTTP/2 does not define a way to carry the version identifier that is included in the HTTP/1.1 request line.
-        final ByteString method = checkNotNull(http2Headers.method(),
+        final CharSequence method = checkNotNull(http2Headers.method(),
                 "method header cannot be null in conversion to HTTP/1.x");
-        final ByteString path = checkNotNull(http2Headers.path(),
+        final CharSequence path = checkNotNull(http2Headers.path(),
                 "path header cannot be null in conversion to HTTP/1.x");
         FullHttpRequest msg = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.valueOf(method
                         .toString()), path.toString(), validateHttpHeaders);
@@ -263,7 +261,7 @@ public final class HttpConversionUtil {
             HttpVersion httpVersion, boolean isTrailer, boolean isRequest) throws Http2Exception {
         Http2ToHttpHeaderTranslator translator = new Http2ToHttpHeaderTranslator(streamId, outputHeaders, isRequest);
         try {
-            for (Entry<ByteString, ByteString> entry : inputHeaders) {
+            for (Entry<CharSequence, CharSequence> entry : inputHeaders) {
                 translator.translate(entry);
             }
         } catch (Http2Exception ex) {
@@ -326,12 +324,10 @@ public final class HttpConversionUtil {
             Entry<CharSequence, CharSequence> entry = iter.next();
             final AsciiString aName = AsciiString.of(entry.getKey()).toLowerCase();
             if (!HTTP_TO_HTTP2_HEADER_BLACKLIST.contains(aName)) {
-                AsciiString aValue = AsciiString.of(entry.getValue());
+                // https://tools.ietf.org/html/rfc7540#section-8.1.2.2 makes a special exception for TE
-                // https://tools.ietf.org/html/draft-ietf-httpbis-http2-16#section-8.1.2.2
-                // makes a special exception for TE
                 if (!aName.contentEqualsIgnoreCase(HttpHeaderNames.TE) ||
-                    aValue.contentEqualsIgnoreCase(HttpHeaderValues.TRAILERS)) {
+                    AsciiString.contentEqualsIgnoreCase(entry.getValue(), HttpHeaderValues.TRAILERS)) {
-                    out.add(aName, aValue);
+                    out.add(aName, AsciiString.of(entry.getValue()));
                 }
             }
         }
@@ -405,23 +401,23 @@ public final class HttpConversionUtil {
         /**
          * Translations from HTTP/2 header name to the HTTP/1.x equivalent.
          */
-        private static final Map<ByteString, ByteString>
+        private static final CharSequenceMap<AsciiString>
-            REQUEST_HEADER_TRANSLATIONS = new HashMap<ByteString, ByteString>();
+            REQUEST_HEADER_TRANSLATIONS = new CharSequenceMap<AsciiString>();
-        private static final Map<ByteString, ByteString>
+        private static final CharSequenceMap<AsciiString>
-            RESPONSE_HEADER_TRANSLATIONS = new HashMap<ByteString, ByteString>();
+            RESPONSE_HEADER_TRANSLATIONS = new CharSequenceMap<AsciiString>();
         static {
-            RESPONSE_HEADER_TRANSLATIONS.put(Http2Headers.PseudoHeaderName.AUTHORITY.value(),
+            RESPONSE_HEADER_TRANSLATIONS.add(Http2Headers.PseudoHeaderName.AUTHORITY.value(),
                             HttpHeaderNames.HOST);
-            RESPONSE_HEADER_TRANSLATIONS.put(Http2Headers.PseudoHeaderName.SCHEME.value(),
+            RESPONSE_HEADER_TRANSLATIONS.add(Http2Headers.PseudoHeaderName.SCHEME.value(),
                             ExtensionHeaderNames.SCHEME.text());
-            REQUEST_HEADER_TRANSLATIONS.putAll(RESPONSE_HEADER_TRANSLATIONS);
+            REQUEST_HEADER_TRANSLATIONS.add(RESPONSE_HEADER_TRANSLATIONS);
-            RESPONSE_HEADER_TRANSLATIONS.put(Http2Headers.PseudoHeaderName.PATH.value(),
+            RESPONSE_HEADER_TRANSLATIONS.add(Http2Headers.PseudoHeaderName.PATH.value(),
                             ExtensionHeaderNames.PATH.text());
         }
 
         private final int streamId;
         private final HttpHeaders output;
-        private final Map<ByteString, ByteString> translations;
+        private final CharSequenceMap<AsciiString> translations;
 
         /**
          * Create a new instance
@@ -436,23 +432,20 @@ public final class HttpConversionUtil {
             translations = request ? REQUEST_HEADER_TRANSLATIONS : RESPONSE_HEADER_TRANSLATIONS;
         }
 
-        public void translate(Entry<ByteString, ByteString> entry) throws Http2Exception {
+        public void translate(Entry<CharSequence, CharSequence> entry) throws Http2Exception {
-            final ByteString name = entry.getKey();
+            final CharSequence name = entry.getKey();
-            final ByteString value = entry.getValue();
+            final CharSequence value = entry.getValue();
-            ByteString translatedName = translations.get(name);
+            AsciiString translatedName = translations.get(name);
-            if (translatedName != null || !Http2Headers.PseudoHeaderName.isPseudoHeader(name)) {
+            if (translatedName != null) {
-                if (translatedName == null) {
+                output.add(translatedName, AsciiString.of(value));
-                    translatedName = name;
+            } else if (!Http2Headers.PseudoHeaderName.isPseudoHeader(name)) {
-                }
+                // https://tools.ietf.org/html/rfc7540#section-8.1.2.3
-
-                // http://tools.ietf.org/html/draft-ietf-httpbis-http2-16#section-8.1.2.3
                 // All headers that start with ':' are only valid in HTTP/2 context
-                if (translatedName.isEmpty() || translatedName.byteAt(0) == ':') {
+                if (name.length() == 0 || name.charAt(0) == ':') {
                     throw streamError(streamId, PROTOCOL_ERROR,
-                            "Invalid HTTP/2 header '%s' encountered in translation to HTTP/1.x", translatedName);
+                            "Invalid HTTP/2 header '%s' encountered in translation to HTTP/1.x", name);
-                } else {
+                }
-                    output.add(new AsciiString(translatedName, false), new AsciiString(value, false));
+                output.add(AsciiString.of(name), AsciiString.of(value));
-                }
             }
         }
     }

codec-http2/src/main/java/io/netty/handler/codec/http2/StreamBufferingEncoder.java

@@ -15,16 +15,11 @@
 
 package io.netty.handler.codec.http2;
 
-import static io.netty.handler.codec.http2.Http2CodecUtil.SMALLEST_MAX_CONCURRENT_STREAMS;
-import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
-import static io.netty.handler.codec.http2.Http2Exception.connectionError;
-
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufUtil;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
-import io.netty.util.ByteString;
 import io.netty.util.ReferenceCountUtil;
 
 import java.util.ArrayDeque;
@@ -33,6 +28,10 @@ import java.util.Map;
 import java.util.Queue;
 import java.util.TreeMap;
 
+import static io.netty.handler.codec.http2.Http2CodecUtil.SMALLEST_MAX_CONCURRENT_STREAMS;
+import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
+import static io.netty.handler.codec.http2.Http2Exception.connectionError;
+
 /**
  * Implementation of a {@link Http2ConnectionEncoder} that dispatches all method call to another
  * {@link Http2ConnectionEncoder}, until {@code SETTINGS_MAX_CONCURRENT_STREAMS} is reached.
@@ -72,9 +71,9 @@ public class StreamBufferingEncoder extends DecoratingHttp2ConnectionEncoder {
         private static final long serialVersionUID = 1326785622777291198L;
         private final int lastStreamId;
         private final long errorCode;
-        private final ByteString debugData;
+        private final byte[] debugData;
 
-        public Http2GoAwayException(int lastStreamId, long errorCode, ByteString debugData) {
+        public Http2GoAwayException(int lastStreamId, long errorCode, byte[] debugData) {
             super(Http2Error.STREAM_CLOSED);
             this.lastStreamId = lastStreamId;
             this.errorCode = errorCode;
@@ -89,7 +88,7 @@ public class StreamBufferingEncoder extends DecoratingHttp2ConnectionEncoder {
             return errorCode;
         }
 
-        public ByteString debugData() {
+        public byte[] debugData() {
             return debugData;
         }
     }
@@ -241,8 +240,7 @@ public class StreamBufferingEncoder extends DecoratingHttp2ConnectionEncoder {
 
     private void cancelGoAwayStreams(int lastStreamId, long errorCode, ByteBuf debugData) {
         Iterator<PendingStream> iter = pendingStreams.values().iterator();
-        Exception e = new Http2GoAwayException(lastStreamId, errorCode,
+        Exception e = new Http2GoAwayException(lastStreamId, errorCode, ByteBufUtil.getBytes(debugData));
-                new ByteString(ByteBufUtil.getBytes(debugData), false));
         while (iter.hasNext()) {
             PendingStream stream = iter.next();
             if (stream.streamId > lastStreamId) {

codec-http2/src/test/java/io/netty/handler/codec/http2/DefaultHttp2FrameIOTest.java

@@ -25,7 +25,6 @@ import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.AsciiString;
-import io.netty.util.ByteString;
 import io.netty.util.CharsetUtil;
 import io.netty.util.concurrent.EventExecutor;
 import org.junit.After;
@@ -381,7 +380,7 @@ public class DefaultHttp2FrameIOTest {
     }
 
     private Http2Headers headersOfSize(final int minSize) {
-        final ByteString singleByte = new ByteString(new byte[]{0});
+        final AsciiString singleByte = new AsciiString(new byte[]{0}, false);
         DefaultHttp2Headers headers = new DefaultHttp2Headers(false);
         for (int size = 0; size < minSize; size += 2) {
             headers.add(singleByte, singleByte);

codec-http2/src/test/java/io/netty/handler/codec/http2/DefaultHttp2HeadersTest.java

@@ -17,17 +17,16 @@
 package io.netty.handler.codec.http2;
 
 import io.netty.handler.codec.http2.Http2Headers.PseudoHeaderName;
-import io.netty.util.ByteString;
+import io.netty.util.AsciiString;
 import org.junit.Test;
 
-import java.util.HashSet;
 import java.util.Map.Entry;
-import java.util.Set;
 
-import static io.netty.util.ByteString.fromAscii;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static io.netty.util.AsciiString.of;
 
 public class DefaultHttp2HeadersTest {
 
@@ -43,23 +42,26 @@ public class DefaultHttp2HeadersTest {
     public void pseudoHeadersWithRemovePreservesPseudoIterationOrder() {
         Http2Headers headers = newHeaders();
 
-        Set<ByteString> nonPseudoHeaders = new HashSet<ByteString>(headers.size());
+        Http2Headers nonPseudoHeaders = new DefaultHttp2Headers();
-        for (Entry<ByteString, ByteString> entry : headers) {
+        for (Entry<CharSequence, CharSequence> entry : headers) {
-            if (entry.getKey().isEmpty() || entry.getKey().byteAt(0) != ':') {
+            if (entry.getKey().length() == 0 || entry.getKey().charAt(0) != ':' &&
-                nonPseudoHeaders.add(entry.getKey());
+                !nonPseudoHeaders.contains(entry.getKey())) {
+                nonPseudoHeaders.add(entry.getKey(), entry.getValue());
             }
         }
 
+        assertFalse(nonPseudoHeaders.isEmpty());
+
         // Remove all the non-pseudo headers and verify
-        for (ByteString nonPseudoHeader : nonPseudoHeaders) {
+        for (Entry<CharSequence, CharSequence> nonPseudoHeaderEntry : nonPseudoHeaders) {
-            assertTrue(headers.remove(nonPseudoHeader));
+            assertTrue(headers.remove(nonPseudoHeaderEntry.getKey()));
             verifyPseudoHeadersFirst(headers);
             verifyAllPseudoHeadersPresent(headers);
         }
 
         // Add back all non-pseudo headers
-        for (ByteString nonPseudoHeader : nonPseudoHeaders) {
+        for (Entry<CharSequence, CharSequence> nonPseudoHeaderEntry : nonPseudoHeaders) {
-            headers.add(nonPseudoHeader, fromAscii("goo"));
+            headers.add(nonPseudoHeaderEntry.getKey(), of("goo"));
             verifyPseudoHeadersFirst(headers);
             verifyAllPseudoHeadersPresent(headers);
         }
@@ -69,7 +71,7 @@ public class DefaultHttp2HeadersTest {
     public void testHeaderNameValidation() {
         Http2Headers headers = newHeaders();
 
-        headers.add(fromAscii("Foo"), fromAscii("foo"));
+        headers.add(of("Foo"), of("foo"));
     }
 
     private static void verifyAllPseudoHeadersPresent(Http2Headers headers) {
@@ -79,9 +81,9 @@ public class DefaultHttp2HeadersTest {
     }
 
     private static void verifyPseudoHeadersFirst(Http2Headers headers) {
-        ByteString lastNonPseudoName = null;
+        CharSequence lastNonPseudoName = null;
-        for (Entry<ByteString, ByteString> entry: headers) {
+        for (Entry<CharSequence, CharSequence> entry: headers) {
-            if (entry.getKey().isEmpty() || entry.getKey().byteAt(0) != ':') {
+            if (entry.getKey().length() == 0 || entry.getKey().charAt(0) != ':') {
                 lastNonPseudoName = entry.getKey();
             } else if (lastNonPseudoName != null) {
                 fail("All pseudo headers must be fist in iteration. Pseudo header " + entry.getKey() +
@@ -92,14 +94,14 @@ public class DefaultHttp2HeadersTest {
 
     private static Http2Headers newHeaders() {
         Http2Headers headers = new DefaultHttp2Headers();
-        headers.add(fromAscii("name1"), fromAscii("value1"), fromAscii("value2"));
+        headers.add(of("name1"), of("value1"), of("value2"));
-        headers.method(fromAscii("POST"));
+        headers.method(of("POST"));
-        headers.add(fromAscii("2name"), fromAscii("value3"));
+        headers.add(of("2name"), of("value3"));
-        headers.path(fromAscii("/index.html"));
+        headers.path(of("/index.html"));
-        headers.status(fromAscii("200"));
+        headers.status(of("200"));
-        headers.authority(fromAscii("netty.io"));
+        headers.authority(of("netty.io"));
-        headers.add(fromAscii("name3"), fromAscii("value4"));
+        headers.add(of("name3"), of("value4"));
-        headers.scheme(fromAscii("https"));
+        headers.scheme(of("https"));
         return headers;
     }
 }

codec-http2/src/test/java/io/netty/handler/codec/http2/Http2TestUtil.java

@@ -19,7 +19,6 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
 import io.netty.util.AsciiString;
-import io.netty.util.ByteString;
 
 import java.util.List;
 import java.util.Random;
@@ -71,8 +70,8 @@ final class Http2TestUtil {
     /**
      * Returns an {@link AsciiString} that wraps a randomly-filled byte array.
      */
-    public static ByteString randomString() {
+    public static AsciiString randomString() {
-        return new ByteString(randomBytes());
+        return new AsciiString(randomBytes());
     }
 
     public static CharSequence of(String s) {

codec-stomp/src/main/java/io/netty/handler/codec/stomp/DefaultStompHeaders.java

@@ -18,7 +18,6 @@ package io.netty.handler.codec.stomp;
 
 import io.netty.handler.codec.CharSequenceValueConverter;
 import io.netty.handler.codec.DefaultHeaders;
-import io.netty.handler.codec.Headers;
 import io.netty.handler.codec.HeadersUtils;
 
 import java.util.Iterator;
@@ -28,215 +27,12 @@ import java.util.Map.Entry;
 import static io.netty.util.AsciiString.CASE_INSENSITIVE_HASHER;
 import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
 
-public class DefaultStompHeaders extends DefaultHeaders<CharSequence> implements StompHeaders {
+public class DefaultStompHeaders
+        extends DefaultHeaders<CharSequence, CharSequence, StompHeaders> implements StompHeaders {
     public DefaultStompHeaders() {
         super(CASE_SENSITIVE_HASHER, CharSequenceValueConverter.INSTANCE);
     }
 
-    @Override
-    public StompHeaders add(CharSequence name, CharSequence value) {
-        super.add(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders add(CharSequence name, Iterable<? extends CharSequence> values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders add(CharSequence name, CharSequence... values) {
-        super.add(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addObject(CharSequence name, Object value) {
-        super.addObject(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addObject(CharSequence name, Iterable<?> values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addObject(CharSequence name, Object... values) {
-        super.addObject(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addBoolean(CharSequence name, boolean value) {
-        super.addBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addChar(CharSequence name, char value) {
-        super.addChar(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addByte(CharSequence name, byte value) {
-        super.addByte(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addShort(CharSequence name, short value) {
-        super.addShort(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addInt(CharSequence name, int value) {
-        super.addInt(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addLong(CharSequence name, long value) {
-        super.addLong(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addFloat(CharSequence name, float value) {
-        super.addFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addDouble(CharSequence name, double value) {
-        super.addDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders addTimeMillis(CharSequence name, long value) {
-        super.addTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders add(Headers<? extends CharSequence> headers) {
-        super.add(headers);
-        return this;
-    }
-
-    @Override
-    public StompHeaders set(CharSequence name, CharSequence value) {
-        super.set(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders set(CharSequence name, Iterable<? extends CharSequence> values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders set(CharSequence name, CharSequence... values) {
-        super.set(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setObject(CharSequence name, Object value) {
-        super.setObject(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setObject(CharSequence name, Iterable<?> values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setObject(CharSequence name, Object... values) {
-        super.setObject(name, values);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setBoolean(CharSequence name, boolean value) {
-        super.setBoolean(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setChar(CharSequence name, char value) {
-        super.setChar(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setByte(CharSequence name, byte value) {
-        super.setByte(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setShort(CharSequence name, short value) {
-        super.setShort(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setInt(CharSequence name, int value) {
-        super.setInt(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setLong(CharSequence name, long value) {
-        super.setLong(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setFloat(CharSequence name, float value) {
-        super.setFloat(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setDouble(CharSequence name, double value) {
-        super.setDouble(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setTimeMillis(CharSequence name, long value) {
-        super.setTimeMillis(name, value);
-        return this;
-    }
-
-    @Override
-    public StompHeaders set(Headers<? extends CharSequence> headers) {
-        super.set(headers);
-        return this;
-    }
-
-    @Override
-    public StompHeaders setAll(Headers<? extends CharSequence> headers) {
-        super.setAll(headers);
-        return this;
-    }
-
-    @Override
-    public StompHeaders clear() {
-        super.clear();
-        return this;
-    }
-
     @Override
     public String getAsString(CharSequence name) {
         return HeadersUtils.getAsString(this, name);

codec-stomp/src/main/java/io/netty/handler/codec/stomp/StompHeaders.java

@@ -26,7 +26,7 @@ import java.util.Map.Entry;
  * The multimap data structure for the STOMP header names and values. It also provides the constants for the standard
  * STOMP header names and values.
  */
-public interface StompHeaders extends Headers<CharSequence> {
+public interface StompHeaders extends Headers<CharSequence, CharSequence, StompHeaders> {
 
     AsciiString ACCEPT_VERSION = new AsciiString("accept-version");
     AsciiString HOST = new AsciiString("host");
@@ -48,108 +48,6 @@ public interface StompHeaders extends Headers<CharSequence> {
     AsciiString CONTENT_LENGTH = new AsciiString("content-length");
     AsciiString CONTENT_TYPE = new AsciiString("content-type");
 
-    @Override
-    StompHeaders add(CharSequence name, CharSequence value);
-
-    @Override
-    StompHeaders add(CharSequence name, Iterable<? extends CharSequence> values);
-
-    @Override
-    StompHeaders add(CharSequence name, CharSequence... values);
-
-    @Override
-    StompHeaders addObject(CharSequence name, Object value);
-
-    @Override
-    StompHeaders addObject(CharSequence name, Iterable<?> values);
-
-    @Override
-    StompHeaders addObject(CharSequence name, Object... values);
-
-    @Override
-    StompHeaders addBoolean(CharSequence name, boolean value);
-
-    @Override
-    StompHeaders addByte(CharSequence name, byte value);
-
-    @Override
-    StompHeaders addChar(CharSequence name, char value);
-
-    @Override
-    StompHeaders addShort(CharSequence name, short value);
-
-    @Override
-    StompHeaders addInt(CharSequence name, int value);
-
-    @Override
-    StompHeaders addLong(CharSequence name, long value);
-
-    @Override
-    StompHeaders addFloat(CharSequence name, float value);
-
-    @Override
-    StompHeaders addDouble(CharSequence name, double value);
-
-    @Override
-    StompHeaders addTimeMillis(CharSequence name, long value);
-
-    @Override
-    StompHeaders add(Headers<? extends CharSequence> headers);
-
-    @Override
-    StompHeaders set(CharSequence name, CharSequence value);
-
-    @Override
-    StompHeaders set(CharSequence name, Iterable<? extends CharSequence> values);
-
-    @Override
-    StompHeaders set(CharSequence name, CharSequence... values);
-
-    @Override
-    StompHeaders setObject(CharSequence name, Object value);
-
-    @Override
-    StompHeaders setObject(CharSequence name, Iterable<?> values);
-
-    @Override
-    StompHeaders setObject(CharSequence name, Object... values);
-
-    @Override
-    StompHeaders setBoolean(CharSequence name, boolean value);
-
-    @Override
-    StompHeaders setByte(CharSequence name, byte value);
-
-    @Override
-    StompHeaders setChar(CharSequence name, char value);
-
-    @Override
-    StompHeaders setShort(CharSequence name, short value);
-
-    @Override
-    StompHeaders setInt(CharSequence name, int value);
-
-    @Override
-    StompHeaders setLong(CharSequence name, long value);
-
-    @Override
-    StompHeaders setFloat(CharSequence name, float value);
-
-    @Override
-    StompHeaders setDouble(CharSequence name, double value);
-
-    @Override
-    StompHeaders setTimeMillis(CharSequence name, long value);
-
-    @Override
-    StompHeaders set(Headers<? extends CharSequence> headers);
-
-    @Override
-    StompHeaders setAll(Headers<? extends CharSequence> headers);
-
-    @Override
-    StompHeaders clear();
-
     /**
      * {@link Headers#get(Object)} and convert the result to a {@link String}.
      * @param name the name of the header to retrieve

codec/src/main/java/io/netty/handler/codec/ByteStringValueConverter.java

@@ -1,140 +0,0 @@
-/*
- * Copyright 2015 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
- * "License"); you may not use this file except in compliance with the License. You may obtain a
- * copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software distributed under the License
- * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
- * or implied. See the License for the specific language governing permissions and limitations under
- * the License.
- */
-package io.netty.handler.codec;
-
-import java.nio.charset.Charset;
-import java.text.ParseException;
-
-import io.netty.handler.codec.DefaultHeaders.HeaderDateFormat;
-import io.netty.util.ByteString;
-import io.netty.util.CharsetUtil;
-import io.netty.util.internal.PlatformDependent;
-
-/**
- * Converts to/from native types, general {@link Object}, and {@link ByteString}s.
- */
-public final class ByteStringValueConverter implements ValueConverter<ByteString> {
-    public static final ByteStringValueConverter INSTANCE = new ByteStringValueConverter();
-    private static final Charset DEFAULT_CHARSET = CharsetUtil.UTF_8;
-
-    private ByteStringValueConverter() {
-    }
-
-    @Override
-    public ByteString convertObject(Object value) {
-        if (value instanceof ByteString) {
-            return (ByteString) value;
-        }
-        if (value instanceof CharSequence) {
-            return new ByteString((CharSequence) value, DEFAULT_CHARSET);
-        }
-        return new ByteString(value.toString(), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertInt(int value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertLong(long value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertDouble(double value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertChar(char value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertBoolean(boolean value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public ByteString convertFloat(float value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public int convertToInt(ByteString value) {
-        return value.parseAsciiInt();
-    }
-
-    @Override
-    public long convertToLong(ByteString value) {
-        return value.parseAsciiLong();
-    }
-
-    @Override
-    public ByteString convertTimeMillis(long value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public long convertToTimeMillis(ByteString value) {
-        try {
-            return HeaderDateFormat.get().parse(value.toString());
-        } catch (ParseException e) {
-            PlatformDependent.throwException(e);
-        }
-        return 0;
-    }
-
-    @Override
-    public double convertToDouble(ByteString value) {
-        return value.parseAsciiDouble();
-    }
-
-    @Override
-    public char convertToChar(ByteString value) {
-        return value.parseChar();
-    }
-
-    @Override
-    public boolean convertToBoolean(ByteString value) {
-        return value.byteAt(0) != 0;
-    }
-
-    @Override
-    public float convertToFloat(ByteString value) {
-        return value.parseAsciiFloat();
-    }
-
-    @Override
-    public ByteString convertShort(short value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public short convertToShort(ByteString value) {
-        return value.parseAsciiShort();
-    }
-
-    @Override
-    public ByteString convertByte(byte value) {
-        return new ByteString(String.valueOf(value), DEFAULT_CHARSET);
-    }
-
-    @Override
-    public byte convertToByte(ByteString value) {
-        return value.byteAt(0);
-    }
-}

codec/src/main/java/io/netty/handler/codec/CharSequenceValueConverter.java

@@ -15,6 +15,7 @@
 package io.netty.handler.codec;
 
 import io.netty.handler.codec.DefaultHeaders.HeaderDateFormat;
+import io.netty.util.AsciiString;
 import io.netty.util.internal.PlatformDependent;
 
 import java.text.ParseException;
@@ -65,6 +66,9 @@ public class CharSequenceValueConverter implements ValueConverter<CharSequence>
 
     @Override
     public boolean convertToBoolean(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseBoolean();
+        }
         return Boolean.parseBoolean(value.toString());
     }
 
@@ -75,14 +79,14 @@ public class CharSequenceValueConverter implements ValueConverter<CharSequence>
 
     @Override
     public byte convertToByte(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).byteAt(0);
+        }
         return Byte.valueOf(value.toString());
     }
 
     @Override
     public char convertToChar(CharSequence value) {
-        if (value.length() == 0) {
-            throw new IllegalArgumentException("'value' is empty.");
-        }
         return value.charAt(0);
     }
 
@@ -93,16 +97,25 @@ public class CharSequenceValueConverter implements ValueConverter<CharSequence>
 
     @Override
     public short convertToShort(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseShort();
+        }
         return Short.valueOf(value.toString());
     }
 
     @Override
     public int convertToInt(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseInt();
+        }
         return Integer.parseInt(value.toString());
     }
 
     @Override
     public long convertToLong(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseLong();
+        }
         return Long.parseLong(value.toString());
     }
 
@@ -117,17 +130,23 @@ public class CharSequenceValueConverter implements ValueConverter<CharSequence>
             return HeaderDateFormat.get().parse(value.toString());
         } catch (ParseException e) {
             PlatformDependent.throwException(e);
-        }
             return 0;
         }
+    }
 
     @Override
     public float convertToFloat(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseFloat();
+        }
         return Float.valueOf(value.toString());
     }
 
     @Override
     public double convertToDouble(CharSequence value) {
+        if (value instanceof AsciiString) {
+            return ((AsciiString) value).parseDouble();
+        }
         return Double.valueOf(value.toString());
     }
 }

codec/src/main/java/io/netty/handler/codec/DefaultHeadersImpl.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package io.netty.handler.codec;
+
+import io.netty.util.HashingStrategy;
+
+/**
+ * A concrete implementation of {@link DefaultHeaders} that allows for direct instantiation.
+ * @param <K> the type of the header name.
+ * @param <V> the type of the header value.
+ */
+public final class DefaultHeadersImpl<K, V> extends DefaultHeaders<K, V, DefaultHeadersImpl<K, V>> {
+    public DefaultHeadersImpl(HashingStrategy<K> nameHashingStrategy,
+            ValueConverter<V> valueConverter, NameValidator<K> nameValidator) {
+        super(nameHashingStrategy, valueConverter, nameValidator);
+    }
+}

codec/src/main/java/io/netty/handler/codec/EmptyHeaders.java

@@ -20,274 +20,276 @@ import java.util.List;
 import java.util.Map.Entry;
 import java.util.Set;
 
-public class EmptyHeaders<T> implements Headers<T> {
+import static io.netty.handler.codec.DefaultHeaders.HASH_CODE_SEED;
+
+public class EmptyHeaders<K, V, T extends Headers<K, V, T>> implements Headers<K, V, T> {
     @Override
-    public T get(T name) {
+    public V get(K name) {
         return null;
     }
 
     @Override
-    public T get(T name, T defaultValue) {
+    public V get(K name, V defaultValue) {
         return null;
     }
 
     @Override
-    public T getAndRemove(T name) {
+    public V getAndRemove(K name) {
         return null;
     }
 
     @Override
-    public T getAndRemove(T name, T defaultValue) {
+    public V getAndRemove(K name, V defaultValue) {
         return null;
     }
 
     @Override
-    public List<T> getAll(T name) {
+    public List<V> getAll(K name) {
         return Collections.emptyList();
     }
 
     @Override
-    public List<T> getAllAndRemove(T name) {
+    public List<V> getAllAndRemove(K name) {
         return Collections.emptyList();
     }
 
     @Override
-    public Boolean getBoolean(T name) {
+    public Boolean getBoolean(K name) {
         return null;
     }
 
     @Override
-    public boolean getBoolean(T name, boolean defaultValue) {
+    public boolean getBoolean(K name, boolean defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Byte getByte(T name) {
+    public Byte getByte(K name) {
         return null;
     }
 
     @Override
-    public byte getByte(T name, byte defaultValue) {
+    public byte getByte(K name, byte defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Character getChar(T name) {
+    public Character getChar(K name) {
         return null;
     }
 
     @Override
-    public char getChar(T name, char defaultValue) {
+    public char getChar(K name, char defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Short getShort(T name) {
+    public Short getShort(K name) {
         return null;
     }
 
     @Override
-    public short getShort(T name, short defaultValue) {
+    public short getShort(K name, short defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Integer getInt(T name) {
+    public Integer getInt(K name) {
         return null;
     }
 
     @Override
-    public int getInt(T name, int defaultValue) {
+    public int getInt(K name, int defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Long getLong(T name) {
+    public Long getLong(K name) {
         return null;
     }
 
     @Override
-    public long getLong(T name, long defaultValue) {
+    public long getLong(K name, long defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Float getFloat(T name) {
+    public Float getFloat(K name) {
         return null;
     }
 
     @Override
-    public float getFloat(T name, float defaultValue) {
+    public float getFloat(K name, float defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Double getDouble(T name) {
+    public Double getDouble(K name) {
         return null;
     }
 
     @Override
-    public double getDouble(T name, double defaultValue) {
+    public double getDouble(K name, double defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Long getTimeMillis(T name) {
+    public Long getTimeMillis(K name) {
         return null;
     }
 
     @Override
-    public long getTimeMillis(T name, long defaultValue) {
+    public long getTimeMillis(K name, long defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Boolean getBooleanAndRemove(T name) {
+    public Boolean getBooleanAndRemove(K name) {
         return null;
     }
 
     @Override
-    public boolean getBooleanAndRemove(T name, boolean defaultValue) {
+    public boolean getBooleanAndRemove(K name, boolean defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Byte getByteAndRemove(T name) {
+    public Byte getByteAndRemove(K name) {
         return null;
     }
 
     @Override
-    public byte getByteAndRemove(T name, byte defaultValue) {
+    public byte getByteAndRemove(K name, byte defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Character getCharAndRemove(T name) {
+    public Character getCharAndRemove(K name) {
         return null;
     }
 
     @Override
-    public char getCharAndRemove(T name, char defaultValue) {
+    public char getCharAndRemove(K name, char defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Short getShortAndRemove(T name) {
+    public Short getShortAndRemove(K name) {
         return null;
     }
 
     @Override
-    public short getShortAndRemove(T name, short defaultValue) {
+    public short getShortAndRemove(K name, short defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Integer getIntAndRemove(T name) {
+    public Integer getIntAndRemove(K name) {
         return null;
     }
 
     @Override
-    public int getIntAndRemove(T name, int defaultValue) {
+    public int getIntAndRemove(K name, int defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Long getLongAndRemove(T name) {
+    public Long getLongAndRemove(K name) {
         return null;
     }
 
     @Override
-    public long getLongAndRemove(T name, long defaultValue) {
+    public long getLongAndRemove(K name, long defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Float getFloatAndRemove(T name) {
+    public Float getFloatAndRemove(K name) {
         return null;
     }
 
     @Override
-    public float getFloatAndRemove(T name, float defaultValue) {
+    public float getFloatAndRemove(K name, float defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Double getDoubleAndRemove(T name) {
+    public Double getDoubleAndRemove(K name) {
         return null;
     }
 
     @Override
-    public double getDoubleAndRemove(T name, double defaultValue) {
+    public double getDoubleAndRemove(K name, double defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public Long getTimeMillisAndRemove(T name) {
+    public Long getTimeMillisAndRemove(K name) {
         return null;
     }
 
     @Override
-    public long getTimeMillisAndRemove(T name, long defaultValue) {
+    public long getTimeMillisAndRemove(K name, long defaultValue) {
         return defaultValue;
     }
 
     @Override
-    public boolean contains(T name) {
+    public boolean contains(K name) {
         return false;
     }
 
     @Override
-    public boolean contains(T name, T value) {
+    public boolean contains(K name, V value) {
         return false;
     }
 
     @Override
-    public boolean containsObject(T name, Object value) {
+    public boolean containsObject(K name, Object value) {
         return false;
     }
 
     @Override
-    public boolean containsBoolean(T name, boolean value) {
+    public boolean containsBoolean(K name, boolean value) {
         return false;
     }
 
     @Override
-    public boolean containsByte(T name, byte value) {
+    public boolean containsByte(K name, byte value) {
         return false;
     }
 
     @Override
-    public boolean containsChar(T name, char value) {
+    public boolean containsChar(K name, char value) {
         return false;
     }
 
     @Override
-    public boolean containsShort(T name, short value) {
+    public boolean containsShort(K name, short value) {
         return false;
     }
 
     @Override
-    public boolean containsInt(T name, int value) {
+    public boolean containsInt(K name, int value) {
         return false;
     }
 
     @Override
-    public boolean containsLong(T name, long value) {
+    public boolean containsLong(K name, long value) {
         return false;
     }
 
     @Override
-    public boolean containsFloat(T name, float value) {
+    public boolean containsFloat(K name, float value) {
         return false;
     }
 
     @Override
-    public boolean containsDouble(T name, double value) {
+    public boolean containsDouble(K name, double value) {
         return false;
     }
 
     @Override
-    public boolean containsTimeMillis(T name, long value) {
+    public boolean containsTimeMillis(K name, long value) {
         return false;
     }
 
@@ -302,188 +304,188 @@ public class EmptyHeaders<T> implements Headers<T> {
     }
 
     @Override
-    public Set<T> names() {
+    public Set<K> names() {
         return Collections.emptySet();
     }
 
     @Override
-    public Headers<T> add(T name, T value) {
+    public T add(K name, V value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> add(T name, Iterable<? extends T> values) {
+    public T add(K name, Iterable<? extends V> values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> add(T name, T... values) {
+    public T add(K name, V... values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addObject(T name, Object value) {
+    public T addObject(K name, Object value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addObject(T name, Iterable<?> values) {
+    public T addObject(K name, Iterable<?> values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addObject(T name, Object... values) {
+    public T addObject(K name, Object... values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addBoolean(T name, boolean value) {
+    public T addBoolean(K name, boolean value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addByte(T name, byte value) {
+    public T addByte(K name, byte value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addChar(T name, char value) {
+    public T addChar(K name, char value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addShort(T name, short value) {
+    public T addShort(K name, short value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addInt(T name, int value) {
+    public T addInt(K name, int value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addLong(T name, long value) {
+    public T addLong(K name, long value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addFloat(T name, float value) {
+    public T addFloat(K name, float value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addDouble(T name, double value) {
+    public T addDouble(K name, double value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> addTimeMillis(T name, long value) {
+    public T addTimeMillis(K name, long value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> add(Headers<? extends T> headers) {
+    public T add(Headers<? extends K, ? extends V, ?> headers) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> set(T name, T value) {
+    public T set(K name, V value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> set(T name, Iterable<? extends T> values) {
+    public T set(K name, Iterable<? extends V> values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> set(T name, T... values) {
+    public T set(K name, V... values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setObject(T name, Object value) {
+    public T setObject(K name, Object value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setObject(T name, Iterable<?> values) {
+    public T setObject(K name, Iterable<?> values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setObject(T name, Object... values) {
+    public T setObject(K name, Object... values) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setBoolean(T name, boolean value) {
+    public T setBoolean(K name, boolean value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setByte(T name, byte value) {
+    public T setByte(K name, byte value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setChar(T name, char value) {
+    public T setChar(K name, char value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setShort(T name, short value) {
+    public T setShort(K name, short value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setInt(T name, int value) {
+    public T setInt(K name, int value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setLong(T name, long value) {
+    public T setLong(K name, long value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setFloat(T name, float value) {
+    public T setFloat(K name, float value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setDouble(T name, double value) {
+    public T setDouble(K name, double value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setTimeMillis(T name, long value) {
+    public T setTimeMillis(K name, long value) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> set(Headers<? extends T> headers) {
+    public T set(Headers<? extends K, ? extends V, ?> headers) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public Headers<T> setAll(Headers<? extends T> headers) {
+    public T setAll(Headers<? extends K, ? extends V, ?> headers) {
         throw new UnsupportedOperationException("read only");
     }
 
     @Override
-    public boolean remove(T name) {
+    public boolean remove(K name) {
         return false;
     }
 
     @Override
-    public Headers<T> clear() {
+    public T clear() {
-        return this;
+        return thisT();
     }
 
     @Override
-    public Iterator<Entry<T, T>> iterator() {
+    public Iterator<Entry<K, V>> iterator() {
-        List<Entry<T, T>> empty = Collections.emptyList();
+        List<Entry<K, V>> empty = Collections.emptyList();
         return empty.iterator();
     }
 
@@ -493,17 +495,22 @@ public class EmptyHeaders<T> implements Headers<T> {
             return false;
         }
 
-        Headers<?> rhs = (Headers<?>) o;
+        Headers<?, ?, ?> rhs = (Headers<?, ?, ?>) o;
         return isEmpty() && rhs.isEmpty();
     }
 
     @Override
     public int hashCode() {
-        return 1;
+        return HASH_CODE_SEED;
     }
 
     @Override
     public String toString() {
         return new StringBuilder(getClass().getSimpleName()).append('[').append(']').toString();
     }
+
+    @SuppressWarnings("unchecked")
+    private T thisT() {
+        return (T) this;
+    }
 }

codec/src/main/java/io/netty/handler/codec/Headers.java

@@ -19,7 +19,15 @@ import java.util.List;
 import java.util.Map.Entry;
 import java.util.Set;
 
-public interface Headers<T> extends Iterable<Entry<T, T>> {
+/**
+ * Common interface for {@link Headers} which represents a mapping of key to value.
+ * Duplicate keys may be allowed by implementations.
+ *
+ * @param <K> the type of the header name.
+ * @param <V> the type of the header value.
+ * @param <T> the type to use for return values when the intention is to return {@code this} object.
+ */
+public interface Headers<K, V, T extends Headers<K, V, T>> extends Iterable<Entry<K, V>> {
     /**
      * Returns the value of a header with the specified name. If there is more than one value for the specified name,
      * the first value in insertion order is returned.
@@ -27,7 +35,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the name of the header to retrieve
      * @return the first header value if the header is found. {@code null} if there's no such header
      */
-    T get(T name);
+    V get(K name);
 
     /**
      * Returns the value of a header with the specified name. If there is more than one value for the specified name,
@@ -37,7 +45,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param defaultValue the default value
      * @return the first header value or {@code defaultValue} if there is no such header
      */
-    T get(T name, T defaultValue);
+    V get(K name, V defaultValue);
 
     /**
      * Returns the value of a header with the specified name and removes it from this object. If there is more than
@@ -46,7 +54,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the name of the header to retrieve
      * @return the first header value or {@code null} if there is no such header
      */
-    T getAndRemove(T name);
+    V getAndRemove(K name);
 
     /**
      * Returns the value of a header with the specified name and removes it from this object. If there is more than
@@ -56,7 +64,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param defaultValue the default value
      * @return the first header value or {@code defaultValue} if there is no such header
      */
-    T getAndRemove(T name, T defaultValue);
+    V getAndRemove(K name, V defaultValue);
 
     /**
      * Returns all values for the header with the specified name. The returned {@link List} can't be modified.
@@ -64,7 +72,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the name of the header to retrieve
      * @return a {@link List} of header values or an empty {@link List} if no values are found.
      */
-    List<T> getAll(T name);
+    List<V> getAll(K name);
 
     /**
      * Returns all values for the header with the specified name and removes them from this object.
@@ -73,7 +81,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the name of the header to retrieve
      * @return a {@link List} of header values or an empty {@link List} if no values are found.
      */
-    List<T> getAllAndRemove(T name);
+    List<V> getAllAndRemove(K name);
 
     /**
      * Returns the {@code boolean} value of a header with the specified name. If there is more than one value for the
@@ -83,7 +91,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code boolean} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code boolean}.
      */
-    Boolean getBoolean(T name);
+    Boolean getBoolean(K name);
 
     /**
      * Returns the {@code boolean} value of a header with the specified name. If there is more than one value for the
@@ -94,7 +102,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code boolean} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code boolean}.
      */
-    boolean getBoolean(T name, boolean defaultValue);
+    boolean getBoolean(K name, boolean defaultValue);
 
     /**
      * Returns the {@code byte} value of a header with the specified name. If there is more than one value for the
@@ -104,7 +112,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code byte} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code byte}.
      */
-    Byte getByte(T name);
+    Byte getByte(K name);
 
     /**
      * Returns the {@code byte} value of a header with the specified name. If there is more than one value for the
@@ -115,7 +123,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code byte} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code byte}.
      */
-    byte getByte(T name, byte defaultValue);
+    byte getByte(K name, byte defaultValue);
 
     /**
      * Returns the {@code char} value of a header with the specified name. If there is more than one value for the
@@ -125,7 +133,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code char} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code char}.
      */
-    Character getChar(T name);
+    Character getChar(K name);
 
     /**
      * Returns the {@code char} value of a header with the specified name. If there is more than one value for the
@@ -136,7 +144,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code char} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code char}.
      */
-    char getChar(T name, char defaultValue);
+    char getChar(K name, char defaultValue);
 
     /**
      * Returns the {@code short} value of a header with the specified name. If there is more than one value for the
@@ -146,7 +154,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code short} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code short}.
      */
-    Short getShort(T name);
+    Short getShort(K name);
 
     /**
      * Returns the {@code short} value of a header with the specified name. If there is more than one value for the
@@ -157,7 +165,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code short} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code short}.
      */
-    short getShort(T name, short defaultValue);
+    short getShort(K name, short defaultValue);
 
     /**
      * Returns the {@code int} value of a header with the specified name. If there is more than one value for the
@@ -167,7 +175,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code int} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code int}.
      */
-    Integer getInt(T name);
+    Integer getInt(K name);
 
     /**
      * Returns the {@code int} value of a header with the specified name. If there is more than one value for the
@@ -178,7 +186,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code int} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code int}.
      */
-    int getInt(T name, int defaultValue);
+    int getInt(K name, int defaultValue);
 
     /**
      * Returns the {@code long} value of a header with the specified name. If there is more than one value for the
@@ -188,7 +196,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code long} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code long}.
      */
-    Long getLong(T name);
+    Long getLong(K name);
 
     /**
      * Returns the {@code long} value of a header with the specified name. If there is more than one value for the
@@ -199,7 +207,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code long} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code long}.
      */
-    long getLong(T name, long defaultValue);
+    long getLong(K name, long defaultValue);
 
     /**
      * Returns the {@code float} value of a header with the specified name. If there is more than one value for the
@@ -209,7 +217,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code float} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code float}.
      */
-    Float getFloat(T name);
+    Float getFloat(K name);
 
     /**
      * Returns the {@code float} value of a header with the specified name. If there is more than one value for the
@@ -220,7 +228,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code float} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code float}.
      */
-    float getFloat(T name, float defaultValue);
+    float getFloat(K name, float defaultValue);
 
     /**
      * Returns the {@code double} value of a header with the specified name. If there is more than one value for the
@@ -230,7 +238,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code double} value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to {@code double}.
      */
-    Double getDouble(T name);
+    Double getDouble(K name);
 
     /**
      * Returns the {@code double} value of a header with the specified name. If there is more than one value for the
@@ -241,7 +249,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code double} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code double}.
      */
-    double getDouble(T name, double defaultValue);
+    double getDouble(K name, double defaultValue);
 
     /**
      * Returns the value of a header with the specified name in milliseconds. If there is more than one value for the
@@ -251,7 +259,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the milliseconds value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to milliseconds.
      */
-    Long getTimeMillis(T name);
+    Long getTimeMillis(K name);
 
     /**
      * Returns the value of a header with the specified name in milliseconds. If there is more than one value for the
@@ -262,7 +270,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the milliseconds value of the first value in insertion order or {@code defaultValue} if there is no such
      *         value or it can't be converted to milliseconds.
      */
-    long getTimeMillis(T name, long defaultValue);
+    long getTimeMillis(K name, long defaultValue);
 
     /**
      * Returns the {@code boolean} value of a header with the specified {@code name} and removes the header from this
@@ -275,7 +283,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code boolean} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code boolean}.
      */
-    Boolean getBooleanAndRemove(T name);
+    Boolean getBooleanAndRemove(K name);
 
     /**
      * Returns the {@code boolean} value of a header with the specified {@code name} and removes the header from this
@@ -289,7 +297,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code boolean} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code boolean}.
      */
-    boolean getBooleanAndRemove(T name, boolean defaultValue);
+    boolean getBooleanAndRemove(K name, boolean defaultValue);
 
     /**
      * Returns the {@code byte} value of a header with the specified {@code name} and removes the header from this
@@ -302,7 +310,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code byte} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code byte}.
      */
-    Byte getByteAndRemove(T name);
+    Byte getByteAndRemove(K name);
 
     /**
      * Returns the {@code byte} value of a header with the specified {@code name} and removes the header from this
@@ -316,7 +324,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code byte} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code byte}.
      */
-    byte getByteAndRemove(T name, byte defaultValue);
+    byte getByteAndRemove(K name, byte defaultValue);
 
     /**
      * Returns the {@code char} value of a header with the specified {@code name} and removes the header from this
@@ -329,7 +337,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code char} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code char}.
      */
-    Character getCharAndRemove(T name);
+    Character getCharAndRemove(K name);
 
     /**
      * Returns the {@code char} value of a header with the specified {@code name} and removes the header from this
@@ -343,7 +351,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code char} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code char}.
      */
-    char getCharAndRemove(T name, char defaultValue);
+    char getCharAndRemove(K name, char defaultValue);
 
     /**
      * Returns the {@code short} value of a header with the specified {@code name} and removes the header from this
@@ -356,7 +364,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code short} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code short}.
      */
-    Short getShortAndRemove(T name);
+    Short getShortAndRemove(K name);
 
     /**
      * Returns the {@code short} value of a header with the specified {@code name} and removes the header from this
@@ -370,7 +378,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code short} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code short}.
      */
-    short getShortAndRemove(T name, short defaultValue);
+    short getShortAndRemove(K name, short defaultValue);
 
     /**
      * Returns the {@code int} value of a header with the specified {@code name} and removes the header from this
@@ -383,7 +391,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code int} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code int}.
      */
-    Integer getIntAndRemove(T name);
+    Integer getIntAndRemove(K name);
 
     /**
      * Returns the {@code int} value of a header with the specified {@code name} and removes the header from this
@@ -397,7 +405,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code int} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code int}.
      */
-    int getIntAndRemove(T name, int defaultValue);
+    int getIntAndRemove(K name, int defaultValue);
 
     /**
      * Returns the {@code long} value of a header with the specified {@code name} and removes the header from this
@@ -410,7 +418,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code long} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code long}.
      */
-    Long getLongAndRemove(T name);
+    Long getLongAndRemove(K name);
 
     /**
      * Returns the {@code long} value of a header with the specified {@code name} and removes the header from this
@@ -424,7 +432,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code long} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code long}.
      */
-    long getLongAndRemove(T name, long defaultValue);
+    long getLongAndRemove(K name, long defaultValue);
 
     /**
      * Returns the {@code float} value of a header with the specified {@code name} and removes the header from this
@@ -437,7 +445,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code float} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code float}.
      */
-    Float getFloatAndRemove(T name);
+    Float getFloatAndRemove(K name);
 
     /**
      * Returns the {@code float} value of a header with the specified {@code name} and removes the header from this
@@ -451,7 +459,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code float} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code float}.
      */
-    float getFloatAndRemove(T name, float defaultValue);
+    float getFloatAndRemove(K name, float defaultValue);
 
     /**
      * Returns the {@code double} value of a header with the specified {@code name} and removes the header from this
@@ -464,7 +472,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code double} value of the first value in insertion order or {@code null} if there is no
      *         such value or it can't be converted to {@code double}.
      */
-    Double getDoubleAndRemove(T name);
+    Double getDoubleAndRemove(K name);
 
     /**
      * Returns the {@code double} value of a header with the specified {@code name} and removes the header from this
@@ -478,7 +486,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the {@code double} value of the first value in insertion order or {@code defaultValue} if there is no
      *         such value or it can't be converted to {@code double}.
      */
-    double getDoubleAndRemove(T name, double defaultValue);
+    double getDoubleAndRemove(K name, double defaultValue);
 
     /**
      * Returns the value of a header with the specified {@code name} in milliseconds and removes the header from this
@@ -491,7 +499,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the milliseconds value of the first value in insertion order or {@code null} if there is no such
      *         value or it can't be converted to milliseconds.
      */
-    Long getTimeMillisAndRemove(T name);
+    Long getTimeMillisAndRemove(K name);
 
     /**
      * Returns the value of a header with the specified {@code name} in milliseconds and removes the header from this
@@ -505,14 +513,14 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @return the milliseconds value of the first value in insertion order or {@code defaultValue} if there is no such
      *         value or it can't be converted to milliseconds.
      */
-    long getTimeMillisAndRemove(T name, long defaultValue);
+    long getTimeMillisAndRemove(K name, long defaultValue);
 
     /**
      * Returns {@code true} if a header with the {@code name} exists, {@code false} otherwise.
      *
      * @param name the header name
      */
-    boolean contains(T name);
+    boolean contains(K name);
 
     /**
      * Returns {@code true} if a header with the {@code name} and {@code value} exists, {@code false} otherwise.
@@ -522,7 +530,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the header name
      * @param value the header value of the header to find
      */
-    boolean contains(T name, T value);
+    boolean contains(K name, V value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -531,7 +539,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsObject(T name, Object value);
+    boolean containsObject(K name, Object value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -540,7 +548,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsBoolean(T name, boolean value);
+    boolean containsBoolean(K name, boolean value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -549,7 +557,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsByte(T name, byte value);
+    boolean containsByte(K name, byte value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -558,7 +566,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsChar(T name, char value);
+    boolean containsChar(K name, char value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -567,7 +575,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsShort(T name, short value);
+    boolean containsShort(K name, short value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -576,7 +584,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsInt(T name, int value);
+    boolean containsInt(K name, int value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -585,7 +593,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsLong(T name, long value);
+    boolean containsLong(K name, long value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -594,7 +602,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsFloat(T name, float value);
+    boolean containsFloat(K name, float value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -603,7 +611,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsDouble(T name, double value);
+    boolean containsDouble(K name, double value);
 
     /**
      * Returns {@code true} if a header with the name and value exists.
@@ -612,7 +620,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the header value
      * @return {@code true} if it contains it {@code false} otherwise
      */
-    boolean containsTimeMillis(T name, long value);
+    boolean containsTimeMillis(K name, long value);
 
     /**
      * Returns the number of headers in this object.
@@ -627,7 +635,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
     /**
      * Returns a {@link Set} of all header names in this object. The returned {@link Set} cannot be modified.
      */
-    Set<T> names();
+    Set<K> names();
 
     /**
      * Adds a new header with the specified {@code name} and {@code value}.
@@ -636,7 +644,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> add(T name, T value);
+    T add(K name, V value);
 
     /**
      * Adds new headers with the specified {@code name} and {@code values}. This method is semantically equivalent to
@@ -651,7 +659,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the values of the header
      * @return {@code this}
      */
-    Headers<T> add(T name, Iterable<? extends T> values);
+    T add(K name, Iterable<? extends V> values);
 
     /**
      * Adds new headers with the specified {@code name} and {@code values}. This method is semantically equivalent to
@@ -666,7 +674,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the values of the header
      * @return {@code this}
      */
-    Headers<T> add(T name, T... values);
+    T add(K name, V... values);
 
     /**
      * Adds a new header. Before the {@code value} is added, it's converted to type {@code T}.
@@ -675,7 +683,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addObject(T name, Object value);
+    T addObject(K name, Object value);
 
     /**
      * Adds a new header with the specified name and values. This method is equivalent to
@@ -690,7 +698,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the value of the header
      * @return {@code this}
      */
-    Headers<T> addObject(T name, Iterable<?> values);
+    T addObject(K name, Iterable<?> values);
 
     /**
      * Adds a new header with the specified name and values. This method is equivalent to
@@ -705,7 +713,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the value of the header
      * @return {@code this}
      */
-    Headers<T> addObject(T name, Object... values);
+    T addObject(K name, Object... values);
 
     /**
      * Adds a new header.
@@ -714,7 +722,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addBoolean(T name, boolean value);
+    T addBoolean(K name, boolean value);
 
     /**
      * Adds a new header.
@@ -723,7 +731,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addByte(T name, byte value);
+    T addByte(K name, byte value);
 
     /**
      * Adds a new header.
@@ -732,7 +740,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addChar(T name, char value);
+    T addChar(K name, char value);
 
     /**
      * Adds a new header.
@@ -741,7 +749,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addShort(T name, short value);
+    T addShort(K name, short value);
 
     /**
      * Adds a new header.
@@ -750,7 +758,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addInt(T name, int value);
+    T addInt(K name, int value);
 
     /**
      * Adds a new header.
@@ -759,7 +767,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addLong(T name, long value);
+    T addLong(K name, long value);
 
     /**
      * Adds a new header.
@@ -768,7 +776,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addFloat(T name, float value);
+    T addFloat(K name, float value);
 
     /**
      * Adds a new header.
@@ -777,7 +785,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addDouble(T name, double value);
+    T addDouble(K name, double value);
 
     /**
      * Adds a new header.
@@ -786,7 +794,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> addTimeMillis(T name, long value);
+    T addTimeMillis(K name, long value);
 
     /**
      * Adds all header names and values of {@code headers} to this object.
@@ -794,7 +802,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @throws IllegalArgumentException if {@code headers == this}.
      * @return {@code this}
      */
-    Headers<T> add(Headers<? extends T> headers);
+    T add(Headers<? extends K, ? extends V, ?> headers);
 
     /**
      * Sets a header with the specified name and value. Any existing headers with the same name are overwritten.
@@ -803,7 +811,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value the value of the header
      * @return {@code this}
      */
-    Headers<T> set(T name, T value);
+    T set(K name, V value);
 
     /**
      * Sets a new header with the specified name and values. This method is equivalent to
@@ -818,7 +826,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the value of the header
      * @return {@code this}
      */
-    Headers<T> set(T name, Iterable<? extends T> values);
+    T set(K name, Iterable<? extends V> values);
 
     /**
      * Sets a header with the specified name and values. Any existing headers with this name are removed. This method
@@ -835,7 +843,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the value of the header
      * @return {@code this}
      */
-    Headers<T> set(T name, T... values);
+    T set(K name, V... values);
 
     /**
      * Sets a new header. Any existing headers with this name are removed. Before the {@code value} is add, it's
@@ -847,7 +855,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      *                              {@code null}.
      * @return {@code this}
      */
-    Headers<T> setObject(T name, Object value);
+    T setObject(K name, Object value);
 
     /**
      * Sets a header with the specified name and values. Any existing headers with this name are removed. This method
@@ -864,7 +872,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the values of the header
      * @return {@code this}
      */
-    Headers<T> setObject(T name, Iterable<?> values);
+    T setObject(K name, Iterable<?> values);
 
     /**
      * Sets a header with the specified name and values. Any existing headers with this name are removed. This method
@@ -881,7 +889,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param values the values of the header
      * @return {@code this}
      */
-    Headers<T> setObject(T name, Object... values);
+    T setObject(K name, Object... values);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -889,7 +897,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setBoolean(T name, boolean value);
+    T setBoolean(K name, boolean value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -897,7 +905,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setByte(T name, byte value);
+    T setByte(K name, byte value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -905,7 +913,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setChar(T name, char value);
+    T setChar(K name, char value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -913,7 +921,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setShort(T name, short value);
+    T setShort(K name, short value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -921,7 +929,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setInt(T name, int value);
+    T setInt(K name, int value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -929,7 +937,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setLong(T name, long value);
+    T setLong(K name, long value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -937,7 +945,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setFloat(T name, float value);
+    T setFloat(K name, float value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -945,7 +953,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setDouble(T name, double value);
+    T setDouble(K name, double value);
 
     /**
      * Set the {@code name} to {@code value}. This will remove all previous values associated with {@code name}.
@@ -953,14 +961,14 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param value The value
      * @return {@code this}
      */
-    Headers<T> setTimeMillis(T name, long value);
+    T setTimeMillis(K name, long value);
 
     /**
      * Clears the current header entries and copies all header entries of the specified {@code headers}.
      *
      * @return {@code this}
      */
-    Headers<T> set(Headers<? extends T> headers);
+    T set(Headers<? extends K, ? extends V, ?> headers);
 
     /**
      * Retains all current headers but calls {@link #set(T, T)} for each entry in {@code headers}.
@@ -968,7 +976,7 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param headers The headers used to {@link #set(T, T)} values in this instance
      * @return {@code this}
      */
-    Headers<T> setAll(Headers<? extends T> headers);
+    T setAll(Headers<? extends K, ? extends V, ?> headers);
 
     /**
      * Removes all headers with the specified {@code name}.
@@ -976,15 +984,15 @@ public interface Headers<T> extends Iterable<Entry<T, T>> {
      * @param name the header name
      * @return {@code true} if at least one entry has been removed.
      */
-    boolean remove(T name);
+    boolean remove(K name);
 
     /**
      * Removes all headers. After a call to this method {@link #size()} equals {@code 0}.
      *
      * @return {@code this}
      */
-    Headers<T> clear();
+    T clear();
 
     @Override
-    Iterator<Entry<T, T>> iterator();
+    Iterator<Entry<K, V>> iterator();
 }

codec/src/main/java/io/netty/handler/codec/HeadersUtils.java

@@ -37,12 +37,12 @@ public final class HeadersUtils {
      * @param name the name of the header to retrieve
      * @return a {@link List} of header values or an empty {@link List} if no values are found.
      */
-    public static <T> List<String> getAllAsString(Headers<T> headers, T name) {
+    public static <K, V> List<String> getAllAsString(Headers<K, V, ?> headers, K name) {
-        final List<T> allNames = headers.getAll(name);
+        final List<V> allNames = headers.getAll(name);
         return new AbstractList<String>() {
             @Override
             public String get(int index) {
-                T value = allNames.get(index);
+                V value = allNames.get(index);
                 return value != null ? value.toString() : null;
             }
 
@@ -59,8 +59,8 @@ public final class HeadersUtils {
      * @param name the name of the header to retrieve
      * @return the first header value if the header is found. {@code null} if there's no such entry.
      */
-    public static <T> String getAsString(Headers<T> headers, T name) {
+    public static <K, V> String getAsString(Headers<K, V, ?> headers, K name) {
-        T orig = headers.get(name);
+        V orig = headers.get(name);
         return orig != null ? orig.toString() : null;
     }
 
@@ -77,7 +77,7 @@ public final class HeadersUtils {
      * @param headers the headers to get the names from
      * @return a {@link Set} of header values or an empty {@link Set} if no values are found.
      */
-    public static Set<String> namesAsString(Headers<CharSequence> headers) {
+    public static Set<String> namesAsString(Headers<CharSequence, CharSequence, ?> headers) {
         return new CharSequenceDelegatingStringSet(headers.names());
     }
 

codec/src/main/java/io/netty/handler/codec/UnsupportedValueConverter.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.handler.codec;
+
+/**
+ * {@link UnsupportedOperationException} will be thrown from all {@link ValueConverter} methods.
+ */
+public final class UnsupportedValueConverter<V> implements ValueConverter<V> {
+    @SuppressWarnings("rawtypes")
+    private static final UnsupportedValueConverter INSTANCE = new UnsupportedValueConverter();
+    private UnsupportedValueConverter() { }
+
+    @SuppressWarnings("unchecked")
+    public static <V> UnsupportedValueConverter<V> instance() {
+        return (UnsupportedValueConverter<V>) INSTANCE;
+    }
+
+    @Override
+    public V convertObject(Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertBoolean(boolean value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean convertToBoolean(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertByte(byte value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public byte convertToByte(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertChar(char value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public char convertToChar(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertShort(short value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public short convertToShort(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertInt(int value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public int convertToInt(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertLong(long value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long convertToLong(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertTimeMillis(long value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long convertToTimeMillis(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertFloat(float value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public float convertToFloat(V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V convertDouble(double value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public double convertToDouble(V value) {
+        throw new UnsupportedOperationException();
+    }
+}

codec/src/test/java/io/netty/handler/codec/DefaultHeadersTest.java

@@ -14,6 +14,15 @@
  */
 package io.netty.handler.codec;
 
+import org.junit.Test;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.NoSuchElementException;
+
+import static io.netty.util.AsciiString.of;
 import static java.util.Arrays.asList;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -22,207 +31,203 @@ import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.NoSuchElementException;
-
-import org.junit.Test;
-
-import io.netty.util.ByteString;
-import io.netty.util.CharsetUtil;
-
 /**
  * Tests for {@link DefaultHeaders}.
  */
 public class DefaultHeadersTest {
 
-    private Headers<ByteString> newInstance() {
+    private static final class TestDefaultHeaders extends
-        return new DefaultHeaders<ByteString>(ByteStringValueConverter.INSTANCE);
+            DefaultHeaders<CharSequence, CharSequence, TestDefaultHeaders> {
+        public TestDefaultHeaders() {
+            super(CharSequenceValueConverter.INSTANCE);
+        }
+    }
+
+    private TestDefaultHeaders newInstance() {
+        return new TestDefaultHeaders();
     }
 
     @Test
     public void addShouldIncreaseAndRemoveShouldDecreaseTheSize() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
         assertEquals(0, headers.size());
-        headers.add(bs("name1"), bs("value1"), bs("value2"));
+        headers.add(of("name1"), of("value1"), of("value2"));
         assertEquals(2, headers.size());
-        headers.add(bs("name2"), bs("value3"), bs("value4"));
+        headers.add(of("name2"), of("value3"), of("value4"));
         assertEquals(4, headers.size());
-        headers.add(bs("name3"), bs("value5"));
+        headers.add(of("name3"), of("value5"));
         assertEquals(5, headers.size());
 
-        headers.remove(bs("name3"));
+        headers.remove(of("name3"));
         assertEquals(4, headers.size());
-        headers.remove(bs("name1"));
+        headers.remove(of("name1"));
         assertEquals(2, headers.size());
-        headers.remove(bs("name2"));
+        headers.remove(of("name2"));
         assertEquals(0, headers.size());
         assertTrue(headers.isEmpty());
     }
 
     @Test
     public void afterClearHeadersShouldBeEmpty() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"));
+        headers.add(of("name1"), of("value1"));
-        headers.add(bs("name2"), bs("value2"));
+        headers.add(of("name2"), of("value2"));
         assertEquals(2, headers.size());
         headers.clear();
         assertEquals(0, headers.size());
         assertTrue(headers.isEmpty());
-        assertFalse(headers.contains(bs("name1")));
+        assertFalse(headers.contains(of("name1")));
-        assertFalse(headers.contains(bs("name2")));
+        assertFalse(headers.contains(of("name2")));
     }
 
     @Test
     public void removingANameForASecondTimeShouldReturnFalse() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"));
+        headers.add(of("name1"), of("value1"));
-        headers.add(bs("name2"), bs("value2"));
+        headers.add(of("name2"), of("value2"));
-        assertTrue(headers.remove(bs("name2")));
+        assertTrue(headers.remove(of("name2")));
-        assertFalse(headers.remove(bs("name2")));
+        assertFalse(headers.remove(of("name2")));
     }
 
     @Test
     public void multipleValuesPerNameShouldBeAllowed() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name"), bs("value1"));
+        headers.add(of("name"), of("value1"));
-        headers.add(bs("name"), bs("value2"));
+        headers.add(of("name"), of("value2"));
-        headers.add(bs("name"), bs("value3"));
+        headers.add(of("name"), of("value3"));
         assertEquals(3, headers.size());
 
-        List<ByteString> values = headers.getAll(bs("name"));
+        List<CharSequence> values = headers.getAll(of("name"));
         assertEquals(3, values.size());
-        assertTrue(values.containsAll(asList(bs("value1"), bs("value2"), bs("value3"))));
+        assertTrue(values.containsAll(asList(of("value1"), of("value2"), of("value3"))));
     }
 
     @Test
     public void testContains() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.addBoolean(bs("boolean"), true);
+        headers.addBoolean(of("boolean"), true);
-        assertTrue(headers.containsBoolean(bs("boolean"), true));
+        assertTrue(headers.containsBoolean(of("boolean"), true));
-        assertFalse(headers.containsBoolean(bs("boolean"), false));
+        assertFalse(headers.containsBoolean(of("boolean"), false));
 
-        headers.addLong(bs("long"), Long.MAX_VALUE);
+        headers.addLong(of("long"), Long.MAX_VALUE);
-        assertTrue(headers.containsLong(bs("long"), Long.MAX_VALUE));
+        assertTrue(headers.containsLong(of("long"), Long.MAX_VALUE));
-        assertFalse(headers.containsLong(bs("long"), Long.MIN_VALUE));
+        assertFalse(headers.containsLong(of("long"), Long.MIN_VALUE));
 
-        headers.addInt(bs("int"), Integer.MIN_VALUE);
+        headers.addInt(of("int"), Integer.MIN_VALUE);
-        assertTrue(headers.containsInt(bs("int"), Integer.MIN_VALUE));
+        assertTrue(headers.containsInt(of("int"), Integer.MIN_VALUE));
-        assertFalse(headers.containsInt(bs("int"), Integer.MAX_VALUE));
+        assertFalse(headers.containsInt(of("int"), Integer.MAX_VALUE));
 
-        headers.addShort(bs("short"), Short.MAX_VALUE);
+        headers.addShort(of("short"), Short.MAX_VALUE);
-        assertTrue(headers.containsShort(bs("short"), Short.MAX_VALUE));
+        assertTrue(headers.containsShort(of("short"), Short.MAX_VALUE));
-        assertFalse(headers.containsShort(bs("short"), Short.MIN_VALUE));
+        assertFalse(headers.containsShort(of("short"), Short.MIN_VALUE));
 
-        headers.addChar(bs("char"), Character.MAX_VALUE);
+        headers.addChar(of("char"), Character.MAX_VALUE);
-        assertTrue(headers.containsChar(bs("char"), Character.MAX_VALUE));
+        assertTrue(headers.containsChar(of("char"), Character.MAX_VALUE));
-        assertFalse(headers.containsChar(bs("char"), Character.MIN_VALUE));
+        assertFalse(headers.containsChar(of("char"), Character.MIN_VALUE));
 
-        headers.addByte(bs("byte"), Byte.MAX_VALUE);
+        headers.addByte(of("byte"), Byte.MAX_VALUE);
-        assertTrue(headers.containsByte(bs("byte"), Byte.MAX_VALUE));
+        assertTrue(headers.containsByte(of("byte"), Byte.MAX_VALUE));
-        assertFalse(headers.containsLong(bs("byte"), Byte.MIN_VALUE));
+        assertFalse(headers.containsLong(of("byte"), Byte.MIN_VALUE));
 
-        headers.addDouble(bs("double"), Double.MAX_VALUE);
+        headers.addDouble(of("double"), Double.MAX_VALUE);
-        assertTrue(headers.containsDouble(bs("double"), Double.MAX_VALUE));
+        assertTrue(headers.containsDouble(of("double"), Double.MAX_VALUE));
-        assertFalse(headers.containsDouble(bs("double"), Double.MIN_VALUE));
+        assertFalse(headers.containsDouble(of("double"), Double.MIN_VALUE));
 
-        headers.addFloat(bs("float"), Float.MAX_VALUE);
+        headers.addFloat(of("float"), Float.MAX_VALUE);
-        assertTrue(headers.containsFloat(bs("float"), Float.MAX_VALUE));
+        assertTrue(headers.containsFloat(of("float"), Float.MAX_VALUE));
-        assertFalse(headers.containsFloat(bs("float"), Float.MIN_VALUE));
+        assertFalse(headers.containsFloat(of("float"), Float.MIN_VALUE));
 
         long millis = System.currentTimeMillis();
-        headers.addTimeMillis(bs("millis"), millis);
+        headers.addTimeMillis(of("millis"), millis);
-        assertTrue(headers.containsTimeMillis(bs("millis"), millis));
+        assertTrue(headers.containsTimeMillis(of("millis"), millis));
         // This test doesn't work on midnight, January 1, 1970 UTC
-        assertFalse(headers.containsTimeMillis(bs("millis"), 0));
+        assertFalse(headers.containsTimeMillis(of("millis"), 0));
 
-        headers.addObject(bs("object"), "Hello World");
+        headers.addObject(of("object"), "Hello World");
-        assertTrue(headers.containsObject(bs("object"), "Hello World"));
+        assertTrue(headers.containsObject(of("object"), "Hello World"));
-        assertFalse(headers.containsObject(bs("object"), ""));
+        assertFalse(headers.containsObject(of("object"), ""));
 
-        headers.add(bs("name"), bs("value"));
+        headers.add(of("name"), of("value"));
-        assertTrue(headers.contains(bs("name"), bs("value")));
+        assertTrue(headers.contains(of("name"), of("value")));
-        assertFalse(headers.contains(bs("name"), bs("value1")));
+        assertFalse(headers.contains(of("name"), of("value1")));
     }
 
     @Test
     public void canMixConvertedAndNormalValues() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name"), bs("value"));
+        headers.add(of("name"), of("value"));
-        headers.addInt(bs("name"), 100);
+        headers.addInt(of("name"), 100);
-        headers.addBoolean(bs("name"), false);
+        headers.addBoolean(of("name"), false);
 
         assertEquals(3, headers.size());
-        assertTrue(headers.contains(bs("name")));
+        assertTrue(headers.contains(of("name")));
-        assertTrue(headers.contains(bs("name"), bs("value")));
+        assertTrue(headers.contains(of("name"), of("value")));
-        assertTrue(headers.containsInt(bs("name"), 100));
+        assertTrue(headers.containsInt(of("name"), 100));
-        assertTrue(headers.containsBoolean(bs("name"), false));
+        assertTrue(headers.containsBoolean(of("name"), false));
     }
 
     @Test
     public void testGetAndRemove() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"));
+        headers.add(of("name1"), of("value1"));
-        headers.add(bs("name2"), bs("value2"), bs("value3"));
+        headers.add(of("name2"), of("value2"), of("value3"));
-        headers.add(bs("name3"), bs("value4"), bs("value5"), bs("value6"));
+        headers.add(of("name3"), of("value4"), of("value5"), of("value6"));
 
-        assertEquals(bs("value1"), headers.getAndRemove(bs("name1"), bs("defaultvalue")));
+        assertEquals(of("value1"), headers.getAndRemove(of("name1"), of("defaultvalue")));
-        assertEquals(bs("value2"), headers.getAndRemove(bs("name2")));
+        assertEquals(of("value2"), headers.getAndRemove(of("name2")));
-        assertNull(headers.getAndRemove(bs("name2")));
+        assertNull(headers.getAndRemove(of("name2")));
-        assertEquals(asList(bs("value4"), bs("value5"), bs("value6")), headers.getAllAndRemove(bs("name3")));
+        assertEquals(asList(of("value4"), of("value5"), of("value6")), headers.getAllAndRemove(of("name3")));
         assertEquals(0, headers.size());
-        assertNull(headers.getAndRemove(bs("noname")));
+        assertNull(headers.getAndRemove(of("noname")));
-        assertEquals(bs("defaultvalue"), headers.getAndRemove(bs("noname"), bs("defaultvalue")));
+        assertEquals(of("defaultvalue"), headers.getAndRemove(of("noname"), of("defaultvalue")));
     }
 
     @Test
     public void whenNameContainsMultipleValuesGetShouldReturnTheFirst() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"), bs("value2"));
+        headers.add(of("name1"), of("value1"), of("value2"));
-        assertEquals(bs("value1"), headers.get(bs("name1")));
+        assertEquals(of("value1"), headers.get(of("name1")));
     }
 
     @Test
     public void getWithDefaultValueWorks() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"));
+        headers.add(of("name1"), of("value1"));
 
-        assertEquals(bs("value1"), headers.get(bs("name1"), bs("defaultvalue")));
+        assertEquals(of("value1"), headers.get(of("name1"), of("defaultvalue")));
-        assertEquals(bs("defaultvalue"), headers.get(bs("noname"), bs("defaultvalue")));
+        assertEquals(of("defaultvalue"), headers.get(of("noname"), of("defaultvalue")));
     }
 
     @Test
     public void setShouldOverWritePreviousValue() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.set(bs("name"), bs("value1"));
+        headers.set(of("name"), of("value1"));
-        headers.set(bs("name"), bs("value2"));
+        headers.set(of("name"), of("value2"));
         assertEquals(1, headers.size());
-        assertEquals(1, headers.getAll(bs("name")).size());
+        assertEquals(1, headers.getAll(of("name")).size());
-        assertEquals(bs("value2"), headers.getAll(bs("name")).get(0));
+        assertEquals(of("value2"), headers.getAll(of("name")).get(0));
-        assertEquals(bs("value2"), headers.get(bs("name")));
+        assertEquals(of("value2"), headers.get(of("name")));
     }
 
     @Test
     public void setAllShouldOverwriteSomeAndLeaveOthersUntouched() {
-        Headers<ByteString> h1 = newInstance();
+        TestDefaultHeaders h1 = newInstance();
 
-        h1.add(bs("name1"), bs("value1"));
+        h1.add(of("name1"), of("value1"));
-        h1.add(bs("name2"), bs("value2"));
+        h1.add(of("name2"), of("value2"));
-        h1.add(bs("name2"), bs("value3"));
+        h1.add(of("name2"), of("value3"));
-        h1.add(bs("name3"), bs("value4"));
+        h1.add(of("name3"), of("value4"));
 
-        Headers<ByteString> h2 = newInstance();
+        TestDefaultHeaders h2 = newInstance();
-        h2.add(bs("name1"), bs("value5"));
+        h2.add(of("name1"), of("value5"));
-        h2.add(bs("name2"), bs("value6"));
+        h2.add(of("name2"), of("value6"));
-        h2.add(bs("name1"), bs("value7"));
+        h2.add(of("name1"), of("value7"));
 
-        Headers<ByteString> expected = newInstance();
+        TestDefaultHeaders expected = newInstance();
-        expected.add(bs("name1"), bs("value5"));
+        expected.add(of("name1"), of("value5"));
-        expected.add(bs("name2"), bs("value6"));
+        expected.add(of("name2"), of("value6"));
-        expected.add(bs("name1"), bs("value7"));
+        expected.add(of("name1"), of("value7"));
-        expected.add(bs("name3"), bs("value4"));
+        expected.add(of("name3"), of("value4"));
 
         h1.setAll(h2);
 
@@ -231,15 +236,15 @@ public class DefaultHeadersTest {
 
     @Test
     public void headersWithSameNamesAndValuesShouldBeEquivalent() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name1"), bs("value1"));
+        headers1.add(of("name1"), of("value1"));
-        headers1.add(bs("name2"), bs("value2"));
+        headers1.add(of("name2"), of("value2"));
-        headers1.add(bs("name2"), bs("value3"));
+        headers1.add(of("name2"), of("value3"));
 
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        headers2.add(bs("name1"), bs("value1"));
+        headers2.add(of("name1"), of("value1"));
-        headers2.add(bs("name2"), bs("value2"));
+        headers2.add(of("name2"), of("value2"));
-        headers2.add(bs("name2"), bs("value3"));
+        headers2.add(of("name2"), of("value3"));
 
         assertEquals(headers1, headers2);
         assertEquals(headers2, headers1);
@@ -252,8 +257,8 @@ public class DefaultHeadersTest {
 
     @Test
     public void emptyHeadersShouldBeEqual() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
         assertNotSame(headers1, headers2);
         assertEquals(headers1, headers2);
         assertEquals(headers1.hashCode(), headers2.hashCode());
@@ -261,29 +266,29 @@ public class DefaultHeadersTest {
 
     @Test
     public void headersWithSameNamesButDifferentValuesShouldNotBeEquivalent() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name1"), bs("value1"));
+        headers1.add(of("name1"), of("value1"));
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        headers1.add(bs("name1"), bs("value2"));
+        headers1.add(of("name1"), of("value2"));
         assertNotEquals(headers1, headers2);
     }
 
     @Test
     public void subsetOfHeadersShouldNotBeEquivalent() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name1"), bs("value1"));
+        headers1.add(of("name1"), of("value1"));
-        headers1.add(bs("name2"), bs("value2"));
+        headers1.add(of("name2"), of("value2"));
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        headers1.add(bs("name1"), bs("value1"));
+        headers1.add(of("name1"), of("value1"));
         assertNotEquals(headers1, headers2);
     }
 
     @Test
     public void headersWithDifferentNamesAndValuesShouldNotBeEquivalent() {
-        Headers<ByteString> h1 = newInstance();
+        TestDefaultHeaders h1 = newInstance();
-        h1.set(bs("name1"), bs("value1"));
+        h1.set(of("name1"), of("value1"));
-        Headers<ByteString> h2 = newInstance();
+        TestDefaultHeaders h2 = newInstance();
-        h2.set(bs("name2"), bs("value2"));
+        h2.set(of("name2"), of("value2"));
         assertNotEquals(h1, h2);
         assertNotEquals(h2, h1);
         assertEquals(h1, h1);
@@ -292,22 +297,22 @@ public class DefaultHeadersTest {
 
     @Test(expected = NoSuchElementException.class)
     public void iterateEmptyHeadersShouldThrow() {
-        Iterator<Map.Entry<ByteString, ByteString>> iterator = newInstance().iterator();
+        Iterator<Map.Entry<CharSequence, CharSequence>> iterator = newInstance().iterator();
         assertFalse(iterator.hasNext());
         iterator.next();
     }
 
     @Test
     public void iteratorShouldReturnAllNameValuePairs() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name1"), bs("value1"), bs("value2"));
+        headers1.add(of("name1"), of("value1"), of("value2"));
-        headers1.add(bs("name2"), bs("value3"));
+        headers1.add(of("name2"), of("value3"));
-        headers1.add(bs("name3"), bs("value4"), bs("value5"), bs("value6"));
+        headers1.add(of("name3"), of("value4"), of("value5"), of("value6"));
-        headers1.add(bs("name1"), bs("value7"), bs("value8"));
+        headers1.add(of("name1"), of("value7"), of("value8"));
         assertEquals(8, headers1.size());
 
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        for (Entry<ByteString, ByteString> entry : headers1) {
+        for (Entry<CharSequence, CharSequence> entry : headers1) {
             headers2.add(entry.getKey(), entry.getValue());
         }
 
@@ -316,45 +321,45 @@ public class DefaultHeadersTest {
 
     @Test
     public void iteratorSetValueShouldChangeHeaderValue() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        headers.add(bs("name1"), bs("value1"), bs("value2"), bs("value3"));
+        headers.add(of("name1"), of("value1"), of("value2"), of("value3"));
-        headers.add(bs("name2"), bs("value4"));
+        headers.add(of("name2"), of("value4"));
         assertEquals(4, headers.size());
 
-        Iterator<Entry<ByteString, ByteString>> iter = headers.iterator();
+        Iterator<Entry<CharSequence, CharSequence>> iter = headers.iterator();
         while (iter.hasNext()) {
-            Entry<ByteString, ByteString> header = iter.next();
+            Entry<CharSequence, CharSequence> header = iter.next();
-            if (bs("name1").equals(header.getKey()) && bs("value2").equals(header.getValue())) {
+            if (of("name1").equals(header.getKey()) && of("value2").equals(header.getValue())) {
-                header.setValue(bs("updatedvalue2"));
+                header.setValue(of("updatedvalue2"));
-                assertEquals(bs("updatedvalue2"), header.getValue());
+                assertEquals(of("updatedvalue2"), header.getValue());
             }
-            if (bs("name1").equals(header.getKey()) && bs("value3").equals(header.getValue())) {
+            if (of("name1").equals(header.getKey()) && of("value3").equals(header.getValue())) {
-                header.setValue(bs("updatedvalue3"));
+                header.setValue(of("updatedvalue3"));
-                assertEquals(bs("updatedvalue3"), header.getValue());
+                assertEquals(of("updatedvalue3"), header.getValue());
             }
         }
 
         assertEquals(4, headers.size());
-        assertTrue(headers.contains(bs("name1"), bs("updatedvalue2")));
+        assertTrue(headers.contains(of("name1"), of("updatedvalue2")));
-        assertFalse(headers.contains(bs("name1"), bs("value2")));
+        assertFalse(headers.contains(of("name1"), of("value2")));
-        assertTrue(headers.contains(bs("name1"), bs("updatedvalue3")));
+        assertTrue(headers.contains(of("name1"), of("updatedvalue3")));
-        assertFalse(headers.contains(bs("name1"), bs("value3")));
+        assertFalse(headers.contains(of("name1"), of("value3")));
     }
 
     @Test
     public void getAllReturnsEmptyListForUnknownName() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
-        assertEquals(0, headers.getAll(bs("noname")).size());
+        assertEquals(0, headers.getAll(of("noname")).size());
     }
 
     @Test
     public void setHeadersShouldClearAndOverwrite() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name"), bs("value"));
+        headers1.add(of("name"), of("value"));
 
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        headers2.add(bs("name"), bs("newvalue"));
+        headers2.add(of("name"), of("newvalue"));
-        headers2.add(bs("name1"), bs("value1"));
+        headers2.add(of("name1"), of("value1"));
 
         headers1.set(headers2);
         assertEquals(headers1, headers2);
@@ -362,18 +367,18 @@ public class DefaultHeadersTest {
 
     @Test
     public void setAllHeadersShouldOnlyOverwriteHeaders() {
-        Headers<ByteString> headers1 = newInstance();
+        TestDefaultHeaders headers1 = newInstance();
-        headers1.add(bs("name"), bs("value"));
+        headers1.add(of("name"), of("value"));
-        headers1.add(bs("name1"), bs("value1"));
+        headers1.add(of("name1"), of("value1"));
 
-        Headers<ByteString> headers2 = newInstance();
+        TestDefaultHeaders headers2 = newInstance();
-        headers2.add(bs("name"), bs("newvalue"));
+        headers2.add(of("name"), of("newvalue"));
-        headers2.add(bs("name2"), bs("value2"));
+        headers2.add(of("name2"), of("value2"));
 
-        Headers<ByteString> expected = newInstance();
+        TestDefaultHeaders expected = newInstance();
-        expected.add(bs("name"), bs("newvalue"));
+        expected.add(of("name"), of("newvalue"));
-        expected.add(bs("name1"), bs("value1"));
+        expected.add(of("name1"), of("value1"));
-        expected.add(bs("name2"), bs("value2"));
+        expected.add(of("name2"), of("value2"));
 
         headers1.setAll(headers2);
         assertEquals(headers1, expected);
@@ -381,17 +386,13 @@ public class DefaultHeadersTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testAddSelf() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
         headers.add(headers);
     }
 
     @Test(expected = IllegalArgumentException.class)
     public void testSetSelf() {
-        Headers<ByteString> headers = newInstance();
+        TestDefaultHeaders headers = newInstance();
         headers.set(headers);
     }
-
-    private ByteString bs(String value) {
-        return new ByteString(value, CharsetUtil.US_ASCII);
-    }
 }

common/src/main/java/io/netty/util/ByteString.java

@@ -1,705 +0,0 @@
-/*
- * Copyright 2015 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
- * "License"); you may not use this file except in compliance with the License. You may obtain a
- * copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software distributed under the License
- * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
- * or implied. See the License for the specific language governing permissions and limitations under
- * the License.
- */
-package io.netty.util;
-
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
-
-import java.nio.ByteBuffer;
-import java.nio.CharBuffer;
-import java.nio.charset.Charset;
-import java.nio.charset.CharsetEncoder;
-import java.util.Arrays;
-
-import io.netty.util.internal.PlatformDependent;
-import io.netty.util.internal.StringUtil;
-
-/**
- * The primary use case for this class is to function as an immutable array of bytes. For performance reasons this
- * class supports sharing memory with external arrays, and also direct access to the underlying memory via
- * {@link #array()}. Care must be taken when directly accessing the memory as that may invalidate assumptions that
- * this object is immutable.
- */
-public class ByteString {
-    /**
-     * Allows sub classes to take advantage of {@link ByteString} operations which need to generate new
-     * ByteString objects.
-     */
-    protected interface ByteStringFactory {
-        ByteString newInstance(byte[] value, int start, int length, boolean copy);
-    }
-
-    /**
-     * Factory which uses the {@link #ByteString(byte[], int, int, boolean)} constructor.
-     */
-    private static final ByteStringFactory DEFAULT_FACTORY = new ByteStringFactory() {
-        @Override
-        public ByteString newInstance(byte[] value, int start, int length, boolean copy) {
-            return new ByteString(value, start, length, copy);
-        }
-    };
-
-    public static final ByteString EMPTY_STRING = new ByteString(0);
-    protected static final int HASH_CODE_PRIME = 31;
-
-    /**
-     * If this value is modified outside the constructor then call {@link #arrayChanged()}.
-     */
-    protected final byte[] value;
-    /**
-     * Offset into {@link #value} that all operations should use when acting upon {@link #value}.
-     */
-    private final int offset;
-    /**
-     * Length in bytes for {@link #value} that we care about. This is independent from {@code value.length}
-     * because we may be looking at a subsection of the array.
-     */
-    private final int length;
-    /**
-     * The hash code is cached after it is first computed. It can be reset with {@link #arrayChanged()}.
-     */
-    private int hash;
-
-    /**
-     * Used for classes which extend this class and want to initialize the {@link #value} array by them selves.
-     */
-    ByteString(int length) {
-        value = new byte[length];
-        offset = 0;
-        this.length = length;
-    }
-
-    /**
-     * Initialize this byte string based upon a byte array. A copy will be made.
-     */
-    public ByteString(byte[] value) {
-        this(value, true);
-    }
-
-    /**
-     * Initialize this byte string based upon a byte array.
-     * {@code copy} determines if a copy is made or the array is shared.
-     */
-    public ByteString(byte[] value, boolean copy) {
-        this(value, 0, checkNotNull(value, "value").length, copy);
-    }
-
-    /**
-     * Construct a new {@link BinaryString} object from a {@code byte[]} array.
-     * @param copy {@code true} then a copy of the memory will be made. {@code false} the underlying memory
-     * will be shared.
-     */
-    public ByteString(byte[] value, int start, int length, boolean copy) {
-        if (copy) {
-            this.value = Arrays.copyOfRange(value, start, start + length);
-            this.offset = 0;
-            this.length = length;
-        } else {
-            if (start < 0 || start > value.length - length) {
-                throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= start + length(" +
-                        length + ") <= " + "value.length(" + value.length + ')');
-            }
-            this.value = value;
-            this.offset = start;
-            this.length = length;
-        }
-    }
-
-    /**
-     * Create a new object which is equal to {@code value}.
-     * @param value The object to replicate.
-     * @param copy {@code true} mean the underlying storage will be copied.
-     * {@code false} means the underlying storage will be shared.
-     */
-    public ByteString(ByteString value, boolean copy) {
-        checkNotNull(value, "value");
-        this.length = value.length();
-        this.hash = value.hash;
-        if (copy) {
-            this.value = new byte[length];
-            System.arraycopy(value.array(), value.arrayOffset(), this.value, 0, length);
-            this.offset = 0;
-        } else {
-            this.value = value.array();
-            this.offset = value.offset;
-        }
-    }
-
-    /**
-     * Create a copy of the underlying storage from {@link value}.
-     * The copy will start at {@link ByteBuffer#position()} and copy {@link ByteBuffer#remaining()} bytes.
-     */
-    public ByteString(ByteBuffer value) {
-        this(value, true);
-    }
-
-    /**
-     * Initialize a {@link ByteString} based upon the underlying storage from {@link value}.
-     * There is a potential to share the underlying array storage if {@link ByteBuffer#hasArray()} is {@code true}.
-     * if {@code copy} is {@code true} a copy will be made of the memory.
-     * if {@code copy} is {@code false} the underlying storage will be shared, if possible.
-     */
-    public ByteString(ByteBuffer value, boolean copy) {
-        this(value, value.position(), checkNotNull(value, "value").remaining(), copy);
-    }
-
-    /**
-     * Initialize a {@link ByteString} based upon the underlying storage from {@link value}.
-     * There is a potential to share the underlying array storage if {@link ByteBuffer#hasArray()} is {@code true}.
-     * if {@code copy} is {@code true} a copy will be made of the memory.
-     * if {@code copy} is {@code false} the underlying storage will be shared, if possible.
-     */
-    public ByteString(ByteBuffer value, int start, int length, boolean copy) {
-        if (start < 0 || length > checkNotNull(value, "value").capacity() - start) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= start + length(" + length
-                            + ") <= " + "value.capacity(" + value.capacity() + ')');
-        }
-
-        if (value.hasArray()) {
-            if (copy) {
-                final int bufferOffset = value.arrayOffset() + start;
-                this.value = Arrays.copyOfRange(value.array(), bufferOffset, bufferOffset + length);
-                offset = 0;
-                this.length = length;
-            } else {
-                this.value = value.array();
-                this.offset = start;
-                this.length = length;
-            }
-        } else {
-            this.value = new byte[length];
-            int oldPos = value.position();
-            value.get(this.value, 0, length);
-            value.position(oldPos);
-            this.offset = 0;
-            this.length = length;
-        }
-    }
-
-    /**
-     * Create a copy of {@link value} into a {@link ByteString} using the encoding type of {@code charset}.
-     */
-    public ByteString(char[] value, Charset charset) {
-        this(value, charset, 0, checkNotNull(value, "value").length);
-    }
-
-    /**
-     * Create a copy of {@link value} into a {@link ByteString} using the encoding type of {@code charset}.
-     * The copy will start at index {@code start} and copy {@code length} bytes.
-     */
-    public ByteString(char[] value, Charset charset, int start, int length) {
-        if (start < 0 || length > checkNotNull(value, "value").length - start) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= start + length(" + length
-                    + ") <= " + "length(" + length + ')');
-        }
-
-        CharBuffer cbuf = CharBuffer.wrap(value, start, start + length);
-        CharsetEncoder encoder = CharsetUtil.getEncoder(charset);
-        ByteBuffer nativeBuffer = ByteBuffer.allocate((int) (encoder.maxBytesPerChar() * length));
-        encoder.encode(cbuf, nativeBuffer, true);
-        final int bufferOffset = nativeBuffer.arrayOffset();
-        this.value = Arrays.copyOfRange(nativeBuffer.array(), bufferOffset, bufferOffset + nativeBuffer.position());
-        this.offset = 0;
-        this.length =  this.value.length;
-    }
-
-    /**
-     * Create a copy of {@link value} into a {@link ByteString} using the encoding type of {@code charset}.
-     */
-    public ByteString(CharSequence value, Charset charset) {
-        this(value, charset, 0, checkNotNull(value, "value").length());
-    }
-
-    /**
-     * Create a copy of {@link value} into a {@link ByteString} using the encoding type of {@code charset}.
-     * The copy will start at index {@code start} and copy {@code length} bytes.
-     */
-    public ByteString(CharSequence value, Charset charset, int start, int length) {
-        if (start < 0 || length > checkNotNull(value, "value").length() - start) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= start + length(" + length
-                    + ") <= " + "length(" + value.length() + ')');
-        }
-
-        CharBuffer cbuf = CharBuffer.wrap(value, start, start + length);
-        CharsetEncoder encoder = CharsetUtil.getEncoder(charset);
-        ByteBuffer nativeBuffer = ByteBuffer.allocate((int) (encoder.maxBytesPerChar() * length));
-        encoder.encode(cbuf, nativeBuffer, true);
-        final int offset = nativeBuffer.arrayOffset();
-        this.value = Arrays.copyOfRange(nativeBuffer.array(), offset, offset + nativeBuffer.position());
-        this.offset = 0;
-        this.length = this.value.length;
-    }
-
-    /**
-     * Create a new {@link ByteString} assuming ASCII encoding of {@code value}.
-     * @param value value to translate assuming ASCII encoding.
-     */
-    public static final ByteString fromAscii(CharSequence value) {
-        return new ByteString(value, CharsetUtil.US_ASCII);
-    }
-
-    /**
-     * Iterates over the readable bytes of this buffer with the specified {@code processor} in ascending order.
-     *
-     * @return {@code -1} if the processor iterated to or beyond the end of the readable bytes.
-     *         The last-visited index If the {@link ByteProcessor#process(byte)} returned {@code false}.
-     */
-    public final int forEachByte(ByteProcessor visitor) throws Exception {
-        return forEachByte0(0, length(), visitor);
-    }
-
-    /**
-     * Iterates over the specified area of this buffer with the specified {@code processor} in ascending order.
-     * (i.e. {@code index}, {@code (index + 1)},  .. {@code (index + length - 1)}).
-     *
-     * @return {@code -1} if the processor iterated to or beyond the end of the specified area.
-     *         The last-visited index If the {@link ByteProcessor#process(byte)} returned {@code false}.
-     */
-    public final int forEachByte(int index, int length, ByteProcessor visitor) throws Exception {
-        if (index < 0 || length > length() - index) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= index(" + index + ") <= start + length(" + length
-                    + ") <= " + "length(" + length() + ')');
-        }
-
-        return forEachByte0(index, length, visitor);
-    }
-
-    private int forEachByte0(int index, int length, ByteProcessor visitor) throws Exception {
-        final int len = offset + length;
-        for (int i = offset + index; i < len; ++i) {
-            if (!visitor.process(value[i])) {
-                return i - offset;
-            }
-        }
-        return -1;
-    }
-
-    /**
-     * Iterates over the readable bytes of this buffer with the specified {@code processor} in descending order.
-     *
-     * @return {@code -1} if the processor iterated to or beyond the beginning of the readable bytes.
-     *         The last-visited index If the {@link ByteProcessor#process(byte)} returned {@code false}.
-     */
-    public final int forEachByteDesc(ByteProcessor visitor) throws Exception {
-        return forEachByteDesc0(0, length(), visitor);
-    }
-
-    /**
-     * Iterates over the specified area of this buffer with the specified {@code processor} in descending order.
-     * (i.e. {@code (index + length - 1)}, {@code (index + length - 2)}, ... {@code index}).
-     *
-     * @return {@code -1} if the processor iterated to or beyond the beginning of the specified area.
-     *         The last-visited index If the {@link ByteProcessor#process(byte)} returned {@code false}.
-     */
-    public final int forEachByteDesc(int index, int length, ByteProcessor visitor) throws Exception {
-        if (index < 0 || length > length() - index) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= index(" + index + ") <= start + length(" + length
-                    + ") <= " + "length(" + length() + ')');
-        }
-
-        return forEachByteDesc0(index, length, visitor);
-    }
-
-    private int forEachByteDesc0(int index, int length, ByteProcessor visitor) throws Exception {
-        final int end = offset + index;
-        for (int i = offset + index + length - 1; i >= end; --i) {
-            if (!visitor.process(value[i])) {
-                return i - offset;
-            }
-        }
-        return -1;
-    }
-
-    public final byte byteAt(int index) {
-        // We must do a range check here to enforce the access does not go outside our sub region of the array.
-        // We rely on the array access itself to pick up the array out of bounds conditions
-        if (index < 0 || index >= length) {
-            throw new IndexOutOfBoundsException("index: " + index + " must be in the range [0," + length + ")");
-        }
-        return value[index + offset];
-    }
-
-    public final boolean isEmpty() {
-        return length == 0;
-    }
-
-    public final int length() {
-        return length;
-    }
-
-    /**
-     * During normal use cases the {@link ByteString} should be immutable, but if the underlying array is shared,
-     * and changes then this needs to be called.
-     */
-    public void arrayChanged() {
-        hash = 0;
-    }
-
-    /**
-     * This gives direct access to the underlying storage array.
-     * The {@link #toByteArray()} should be preferred over this method.
-     * If the return value is changed then {@link #arrayChanged()} must be called.
-     * @see #arrayOffset()
-     * @see #isEntireArrayUsed()
-     */
-    public final byte[] array() {
-        return value;
-    }
-
-    /**
-     * The offset into {@link #array()} for which data for this ByteString begins.
-     * @see #array()
-     * @see #isEntireArrayUsed()
-     */
-    public final int arrayOffset() {
-        return offset;
-    }
-
-    /**
-     * Determine if the storage represented by {@link #array()} is entirely used.
-     * @see #array()
-     */
-    public final boolean isEntireArrayUsed() {
-        return offset == 0 && length == value.length;
-    }
-
-    /**
-     * Converts this string to a byte array.
-     */
-    public final byte[] toByteArray() {
-        return toByteArray(0, length());
-    }
-
-    /**
-     * Converts a subset of this string to a byte array.
-     * The subset is defined by the range [{@code start}, {@code end}).
-     */
-    public final byte[] toByteArray(int start, int end) {
-        return Arrays.copyOfRange(value, start + offset, end + offset);
-    }
-
-    /**
-     * Copies the content of this string to a byte array.
-     *
-     * @param srcIdx the starting offset of characters to copy.
-     * @param dst the destination byte array.
-     * @param dstIdx the starting offset in the destination byte array.
-     * @param length the number of characters to copy.
-     */
-    public final void copy(int srcIdx, byte[] dst, int dstIdx, int length) {
-        if (srcIdx < 0 || length > length() - srcIdx) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= srcIdx(" + srcIdx + ") <= srcIdx + length("
-                            + length + ") <= srcLen(" + length() + ')');
-        }
-
-        System.arraycopy(value, srcIdx + offset, checkNotNull(dst, "dst"), dstIdx, length);
-    }
-
-    @Override
-    public int hashCode() {
-        int h = hash;
-        if (h == 0) {
-            final int end = offset + length;
-            for (int i = offset; i < end; ++i) {
-                h = h * HASH_CODE_PRIME + value[i];
-            }
-
-            hash = h;
-        }
-        return hash;
-    }
-
-    /**
-     * Copies a range of characters into a new string.
-     * @param start the offset of the first character (inclusive).
-     * @return a new string containing the characters from start to the end of the string.
-     * @throws IndexOutOfBoundsException if {@code start < 0} or {@code start > length()}.
-     */
-    public ByteString subSequence(int start) {
-        return subSequence(start, length());
-    }
-
-    /**
-     * Copies a range of characters into a new string.
-     * @param start the offset of the first character (inclusive).
-     * @param end The index to stop at (exclusive).
-     * @return a new string containing the characters from start to the end of the string.
-     * @throws IndexOutOfBoundsException if {@code start < 0} or {@code start > length()}.
-     */
-    public ByteString subSequence(int start, int end) {
-        return subSequence(start, end, true);
-    }
-
-    /**
-     * Either copy or share a subset of underlying sub-sequence of bytes.
-     * @param start the offset of the first character (inclusive).
-     * @param end The index to stop at (exclusive).
-     * @param copy If {@code true} then a copy of the underlying storage will be made.
-     * If {@code false} then the underlying storage will be shared.
-     * @return a new string containing the characters from start to the end of the string.
-     * @throws IndexOutOfBoundsException if {@code start < 0} or {@code start > length()}.
-     */
-    public ByteString subSequence(int start, int end, boolean copy) {
-        return subSequence(start, end, copy, DEFAULT_FACTORY);
-    }
-
-    /**
-     * Either copy or share a subset of underlying sub-sequence of bytes.
-     * @param start the offset of the first character (inclusive).
-     * @param end The index to stop at (exclusive).
-     * @param copy If {@code true} then a copy of the underlying storage will be made.
-     * If {@code false} then the underlying storage will be shared.
-     * @param factory The factory used to generate a new {@link ByteString} object.
-     * @return a new string containing the characters from start to the end of the string.
-     * @throws IndexOutOfBoundsException if {@code start < 0} or {@code start > length()}.
-     */
-    protected ByteString subSequence(int start, int end, boolean copy, ByteStringFactory factory) {
-        if (start < 0 || start > end || end > length()) {
-            throw new IndexOutOfBoundsException("expected: 0 <= start(" + start + ") <= end (" + end + ") <= length("
-                            + length() + ')');
-        }
-
-        if (start == 0 && end == length()) {
-            return this;
-        }
-
-        if (end == start) {
-            return EMPTY_STRING;
-        }
-
-        return factory.newInstance(value, start + offset, end - start, copy);
-    }
-
-    public final int parseAsciiInt() {
-        return parseAsciiInt(0, length(), 10);
-    }
-
-    public final int parseAsciiInt(int radix) {
-        return parseAsciiInt(0, length(), radix);
-    }
-
-    public final int parseAsciiInt(int start, int end) {
-        return parseAsciiInt(start, end, 10);
-    }
-
-    public final int parseAsciiInt(int start, int end, int radix) {
-        if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
-            throw new NumberFormatException();
-        }
-
-        if (start == end) {
-            throw new NumberFormatException();
-        }
-
-        int i = start;
-        boolean negative = byteAt(i) == '-';
-        if (negative && ++i == end) {
-            throw new NumberFormatException(subSequence(start, end, false).toString());
-        }
-
-        return parseAsciiInt(i, end, radix, negative);
-    }
-
-    private int parseAsciiInt(int start, int end, int radix, boolean negative) {
-        int max = Integer.MIN_VALUE / radix;
-        int result = 0;
-        int currOffset = start;
-        while (currOffset < end) {
-            int digit = Character.digit((char) (value[currOffset++ + offset] & 0xFF), radix);
-            if (digit == -1) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            if (max > result) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            int next = result * radix - digit;
-            if (next > result) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            result = next;
-        }
-        if (!negative) {
-            result = -result;
-            if (result < 0) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-        }
-        return result;
-    }
-
-    public final long parseAsciiLong() {
-        return parseAsciiLong(0, length(), 10);
-    }
-
-    public final long parseAsciiLong(int radix) {
-        return parseAsciiLong(0, length(), radix);
-    }
-
-    public final long parseAsciiLong(int start, int end) {
-        return parseAsciiLong(start, end, 10);
-    }
-
-    public final long parseAsciiLong(int start, int end, int radix) {
-        if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
-            throw new NumberFormatException();
-        }
-
-        if (start == end) {
-            throw new NumberFormatException();
-        }
-
-        int i = start;
-        boolean negative = byteAt(i) == '-';
-        if (negative && ++i == end) {
-            throw new NumberFormatException(subSequence(start, end, false).toString());
-        }
-
-        return parseAsciiLong(i, end, radix, negative);
-    }
-
-    private long parseAsciiLong(int start, int end, int radix, boolean negative) {
-        long max = Long.MIN_VALUE / radix;
-        long result = 0;
-        int currOffset = start;
-        while (currOffset < end) {
-            int digit = Character.digit((char) (value[currOffset++ + offset] & 0xFF), radix);
-            if (digit == -1) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            if (max > result) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            long next = result * radix - digit;
-            if (next > result) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-            result = next;
-        }
-        if (!negative) {
-            result = -result;
-            if (result < 0) {
-                throw new NumberFormatException(subSequence(start, end, false).toString());
-            }
-        }
-        return result;
-    }
-
-    public final char parseChar() {
-        return parseChar(0);
-    }
-
-    public char parseChar(int start) {
-        if (start + 1 >= length()) {
-            throw new IndexOutOfBoundsException("2 bytes required to convert to character. index " +
-                    start + " would go out of bounds.");
-        }
-        final int startWithOffset = start + offset;
-        return (char) (((value[startWithOffset] & 0xFF) << 8) | (value[startWithOffset + 1] & 0xFF));
-    }
-
-    public final short parseAsciiShort() {
-        return parseAsciiShort(0, length(), 10);
-    }
-
-    public final short parseAsciiShort(int radix) {
-        return parseAsciiShort(0, length(), radix);
-    }
-
-    public final short parseAsciiShort(int start, int end) {
-        return parseAsciiShort(start, end, 10);
-    }
-
-    public final short parseAsciiShort(int start, int end, int radix) {
-        int intValue = parseAsciiInt(start, end, radix);
-        short result = (short) intValue;
-        if (result != intValue) {
-            throw new NumberFormatException(subSequence(start, end, false).toString());
-        }
-        return result;
-    }
-
-    public final float parseAsciiFloat() {
-        return parseAsciiFloat(0, length());
-    }
-
-    public final float parseAsciiFloat(int start, int end) {
-        return Float.parseFloat(toString(start, end));
-    }
-
-    public final double parseAsciiDouble() {
-        return parseAsciiDouble(0, length());
-    }
-
-    public final double parseAsciiDouble(int start, int end) {
-        return Double.parseDouble(toString(start, end));
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        if (!(obj instanceof ByteString)) {
-            return false;
-        }
-        if (this == obj) {
-            return true;
-        }
-
-        ByteString other = (ByteString) obj;
-        return hashCode() == other.hashCode() &&
-               PlatformDependent.equals(array(), arrayOffset(), arrayOffset() + length(),
-                                        other.array(), other.arrayOffset(), other.arrayOffset() + other.length());
-    }
-
-    /**
-     * Translates the entire byte string to a {@link String}.
-     * @see {@link #toString(int, int)}
-     */
-    @Override
-    public String toString() {
-        return toString(0, length());
-    }
-
-    /**
-     * Translates the entire byte string to a {@link String} using the {@code charset} encoding.
-     * @see {@link #toString(Charset, int, int)}
-     */
-    public final String toString(Charset charset) {
-        return toString(charset, 0, length());
-    }
-
-    /**
-     * Translates the [{@code start}, {@code end}) range of this byte string to a {@link String}.
-     * @see {@link #toString(Charset, int, int)}
-     */
-    public final String toString(int start, int end) {
-        return toString(CharsetUtil.ISO_8859_1, start, end);
-    }
-
-    /**
-     * Translates the [{@code start}, {@code end}) range of this byte string to a {@link String}
-     * using the {@code charset} encoding.
-     */
-    public String toString(Charset charset, int start, int end) {
-        int length = end - start;
-        if (length == 0) {
-            return StringUtil.EMPTY_STRING;
-        }
-
-        if (start < 0 || length > length() - start) {
-            throw new IndexOutOfBoundsException("expected: " + "0 <= start(" + start + ") <= srcIdx + length("
-                            + length + ") <= srcLen(" + length() + ')');
-        }
-
-        return new String(value, start + offset, length, charset);
-    }
-}

common/src/main/java/io/netty/util/internal/MathUtil.java

@@ -35,4 +35,16 @@ public final class MathUtil {
         assert value > Integer.MIN_VALUE && value < 0x40000000;
         return 1 << (32 - Integer.numberOfLeadingZeros(value - 1));
     }
+
+    /**
+     * Determine if the requested {@code index} and {@code length} will fit within {@code capacity}.
+     * @param index The starting index.
+     * @param length The length which will be utilized (starting from {@code index}).
+     * @param capacity The capacity that {@code index + length} is allowed to be within.
+     * @return {@code true} if the requested {@code index} and {@code length} will fit within {@code capacity}.
+     * {@code false} if this would result in an index out of bounds exception.
+     */
+    public static boolean isOutOfBounds(int index, int length, int capacity) {
+        return (index | length | (index + length) | (capacity - (index + length))) < 0;
+    }
 }

common/src/main/java/io/netty/util/internal/PlatformDependent.java

@@ -87,7 +87,7 @@ public final class PlatformDependent {
     private static final int BIT_MODE = bitMode0();
 
     private static final int ADDRESS_SIZE = addressSize0();
-    private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
+    public static final boolean BIG_ENDIAN_NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
 
     static {
         if (logger.isDebugEnabled()) {

common/src/test/java/io/netty/util/AsciiStringCharacterTest.java

@@ -22,17 +22,20 @@ import java.nio.CharBuffer;
 import java.nio.charset.Charset;
 import java.util.Random;
 
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotEquals;
 import static io.netty.util.AsciiString.caseInsensitiveHashCode;
 import static io.netty.util.AsciiString.contains;
 import static io.netty.util.AsciiString.containsIgnoreCase;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
 /**
- * Test for the {@link AsciiString} class
+ * Test character encoding and case insensitivity for the {@link AsciiString} class
  */
-public class AsciiStringTest {
+public class AsciiStringCharacterTest {
+    private static final Random r = new Random();
+
     @Test
     public void testGetBytesStringBuilder() {
         final StringBuilder b = new StringBuilder();
@@ -44,7 +47,7 @@ public class AsciiStringTest {
         for (int i = 0; i < charsets.length; ++i) {
             final Charset charset = charsets[i];
             byte[] expected = bString.getBytes(charset);
-            byte[] actual = new ByteString(b, charset).toByteArray();
+            byte[] actual = new AsciiString(b, charset).toByteArray();
             assertArrayEquals("failure for " + charset, expected, actual);
         }
     }
@@ -60,7 +63,7 @@ public class AsciiStringTest {
         for (int i = 0; i < charsets.length; ++i) {
             final Charset charset = charsets[i];
             byte[] expected = bString.getBytes(charset);
-            byte[] actual = new ByteString(bString, charset).toByteArray();
+            byte[] actual = new AsciiString(bString, charset).toByteArray();
             assertArrayEquals("failure for " + charset, expected, actual);
         }
     }
@@ -156,18 +159,17 @@ public class AsciiStringTest {
 
     @Test
     public void testCaseSensitivity() {
-        Random r = new Random();
         int i = 0;
         for (; i < 32; i++) {
-            doCaseSensitivity(r, i);
+            doCaseSensitivity(i);
         }
         final int min = i;
         final int max = 4000;
         final int len = r.nextInt((max - min) + 1) + min;
-        doCaseSensitivity(r, len);
+        doCaseSensitivity(len);
     }
 
-    private static void doCaseSensitivity(Random r, int len) {
+    private static void doCaseSensitivity(int len) {
         // Build an upper case and lower case string
         final int upperA = 'A';
         final int upperZ = 'Z';
@@ -183,22 +185,18 @@ public class AsciiStringTest {
         String lowerCaseString = new String(lowerCaseBytes);
         AsciiString lowerCaseAscii = new AsciiString(lowerCaseBytes, false);
         AsciiString upperCaseAscii = new AsciiString(upperCaseString);
-        ByteString lowerCaseByteString = new ByteString(lowerCaseBytes);
-        ByteString upperCaseByteString = new ByteString(upperCaseString, CharsetUtil.US_ASCII);
         final String errorString = "len: " + len;
         // Test upper case hash codes are equal
         final int upperCaseExpected = upperCaseAscii.hashCode();
         assertEquals(errorString, upperCaseExpected, AsciiString.hashCode(upperCaseBuilder));
         assertEquals(errorString, upperCaseExpected, AsciiString.hashCode(upperCaseString));
         assertEquals(errorString, upperCaseExpected, upperCaseAscii.hashCode());
-        assertEquals(errorString, upperCaseExpected, upperCaseByteString.hashCode());
 
         // Test lower case hash codes are equal
         final int lowerCaseExpected = lowerCaseAscii.hashCode();
         assertEquals(errorString, lowerCaseExpected, AsciiString.hashCode(lowerCaseAscii));
         assertEquals(errorString, lowerCaseExpected, AsciiString.hashCode(lowerCaseString));
         assertEquals(errorString, lowerCaseExpected, lowerCaseAscii.hashCode());
-        assertEquals(errorString, lowerCaseExpected, lowerCaseByteString.hashCode());
 
         // Test case insensitive hash codes are equal
         final int expectedCaseInsensative = lowerCaseAscii.hashCodeCaseInsensitive();
@@ -210,11 +208,9 @@ public class AsciiStringTest {
         assertEquals(errorString, expectedCaseInsensative, lowerCaseAscii.hashCodeCaseInsensitive());
         assertEquals(errorString, expectedCaseInsensative, upperCaseAscii.hashCodeCaseInsensitive());
 
-        // Test that opposite cases are not equal
+        // Test that opposite cases are equal
-        if (len != 0) {
+        assertEquals(errorString, lowerCaseAscii.hashCode(), AsciiString.hashCode(upperCaseString));
-            assertNotEquals(errorString, lowerCaseAscii.hashCode(), AsciiString.hashCode(upperCaseString));
+        assertEquals(errorString, upperCaseAscii.hashCode(), AsciiString.hashCode(lowerCaseString));
-            assertNotEquals(errorString, upperCaseAscii.hashCode(), AsciiString.hashCode(lowerCaseString));
-        }
     }
 
     @Test
@@ -228,4 +224,13 @@ public class AsciiStringTest {
         CharBuffer buffer = CharBuffer.wrap(array, offset, s1.length());
         assertEquals(caseInsensitiveHashCode(s1), caseInsensitiveHashCode(buffer));
     }
+
+    @Test
+    public void testBooleanUtilityMethods() {
+        assertTrue(new AsciiString(new byte[] { 1 }).parseBoolean());
+        assertFalse(AsciiString.EMPTY_STRING.parseBoolean());
+        assertFalse(new AsciiString(new byte[] { 0 }).parseBoolean());
+        assertTrue(new AsciiString(new byte[] { 5 }).parseBoolean());
+        assertTrue(new AsciiString(new byte[] { 2, 0 }).parseBoolean());
+    }
 }

common/src/test/java/io/netty/util/AsciiStringMemoryTest.java

@@ -25,16 +25,16 @@ import org.junit.Before;
 import org.junit.Test;
 
 /**
- * Test for the {@link ByteString} class.
+ * Test the underlying memory methods for the {@link AsciiString} class.
  */
-public class ByteStringTest {
+public class AsciiStringMemoryTest {
     private byte[] a;
     private byte[] b;
     private int aOffset = 22;
     private int bOffset = 53;
     private int length = 100;
-    private ByteString aByteString;
+    private AsciiString aAsciiString;
-    private ByteString bByteString;
+    private AsciiString bAsciiString;
     private Random r = new Random();
 
     @Before
@@ -47,32 +47,32 @@ public class ByteStringTest {
         bOffset = 53;
         length = 100;
         System.arraycopy(a, aOffset, b, bOffset, length);
-        aByteString = new ByteString(a, aOffset, length, false);
+        aAsciiString = new AsciiString(a, aOffset, length, false);
-        bByteString = new ByteString(b, bOffset, length, false);
+        bAsciiString = new AsciiString(b, bOffset, length, false);
     }
 
     @Test
     public void testSharedMemory() {
         ++a[aOffset];
-        ByteString aByteString1 = new ByteString(a, aOffset, length, true);
+        AsciiString aAsciiString1 = new AsciiString(a, aOffset, length, true);
-        ByteString aByteString2 = new ByteString(a, aOffset, length, false);
+        AsciiString aAsciiString2 = new AsciiString(a, aOffset, length, false);
-        assertEquals(aByteString, aByteString1);
+        assertEquals(aAsciiString, aAsciiString1);
-        assertEquals(aByteString, aByteString2);
+        assertEquals(aAsciiString, aAsciiString2);
         for (int i = aOffset; i < length; ++i) {
-            assertEquals(a[i], aByteString.byteAt(i - aOffset));
+            assertEquals(a[i], aAsciiString.byteAt(i - aOffset));
         }
     }
 
     @Test
     public void testNotSharedMemory() {
-        ByteString aByteString1 = new ByteString(a, aOffset, length, true);
+        AsciiString aAsciiString1 = new AsciiString(a, aOffset, length, true);
         ++a[aOffset];
-        assertNotEquals(aByteString, aByteString1);
+        assertNotEquals(aAsciiString, aAsciiString1);
         int i = aOffset;
-        assertNotEquals(a[i], aByteString1.byteAt(i - aOffset));
+        assertNotEquals(a[i], aAsciiString1.byteAt(i - aOffset));
         ++i;
         for (; i < length; ++i) {
-            assertEquals(a[i], aByteString1.byteAt(i - aOffset));
+            assertEquals(a[i], aAsciiString1.byteAt(i - aOffset));
         }
     }
 
@@ -80,69 +80,69 @@ public class ByteStringTest {
     public void forEachTest() throws Exception {
         final AtomicReference<Integer> aCount = new AtomicReference<Integer>(0);
         final AtomicReference<Integer> bCount = new AtomicReference<Integer>(0);
-        aByteString.forEachByte(new ByteProcessor() {
+        aAsciiString.forEachByte(new ByteProcessor() {
             int i;
             @Override
             public boolean process(byte value) throws Exception {
-                assertEquals("failed at index: " + i, value, bByteString.byteAt(i++));
+                assertEquals("failed at index: " + i, value, bAsciiString.byteAt(i++));
                 aCount.set(aCount.get() + 1);
                 return true;
             }
         });
-        bByteString.forEachByte(new ByteProcessor() {
+        bAsciiString.forEachByte(new ByteProcessor() {
             int i;
             @Override
             public boolean process(byte value) throws Exception {
-                assertEquals("failed at index: " + i, value, aByteString.byteAt(i++));
+                assertEquals("failed at index: " + i, value, aAsciiString.byteAt(i++));
                 bCount.set(bCount.get() + 1);
                 return true;
             }
         });
-        assertEquals(aByteString.length(), aCount.get().intValue());
+        assertEquals(aAsciiString.length(), aCount.get().intValue());
-        assertEquals(bByteString.length(), bCount.get().intValue());
+        assertEquals(bAsciiString.length(), bCount.get().intValue());
     }
 
     @Test
     public void forEachDescTest() throws Exception {
         final AtomicReference<Integer> aCount = new AtomicReference<Integer>(0);
         final AtomicReference<Integer> bCount = new AtomicReference<Integer>(0);
-        aByteString.forEachByteDesc(new ByteProcessor() {
+        aAsciiString.forEachByteDesc(new ByteProcessor() {
             int i = 1;
             @Override
             public boolean process(byte value) throws Exception {
-                assertEquals("failed at index: " + i, value, bByteString.byteAt(bByteString.length() - (i++)));
+                assertEquals("failed at index: " + i, value, bAsciiString.byteAt(bAsciiString.length() - (i++)));
                 aCount.set(aCount.get() + 1);
                 return true;
             }
         });
-        bByteString.forEachByteDesc(new ByteProcessor() {
+        bAsciiString.forEachByteDesc(new ByteProcessor() {
             int i = 1;
             @Override
             public boolean process(byte value) throws Exception {
-                assertEquals("failed at index: " + i, value, aByteString.byteAt(aByteString.length() - (i++)));
+                assertEquals("failed at index: " + i, value, aAsciiString.byteAt(aAsciiString.length() - (i++)));
                 bCount.set(bCount.get() + 1);
                 return true;
             }
         });
-        assertEquals(aByteString.length(), aCount.get().intValue());
+        assertEquals(aAsciiString.length(), aCount.get().intValue());
-        assertEquals(bByteString.length(), bCount.get().intValue());
+        assertEquals(bAsciiString.length(), bCount.get().intValue());
     }
 
     @Test
     public void subSequenceTest() {
         final int start = 12;
-        final int end = aByteString.length();
+        final int end = aAsciiString.length();
-        ByteString aSubSequence = aByteString.subSequence(start, end, false);
+        AsciiString aSubSequence = aAsciiString.subSequence(start, end, false);
-        ByteString bSubSequence = bByteString.subSequence(start, end, true);
+        AsciiString bSubSequence = bAsciiString.subSequence(start, end, true);
         assertEquals(aSubSequence, bSubSequence);
         assertEquals(aSubSequence.hashCode(), bSubSequence.hashCode());
     }
 
     @Test
     public void copyTest() {
-        byte[] aCopy = new byte[aByteString.length()];
+        byte[] aCopy = new byte[aAsciiString.length()];
-        aByteString.copy(0, aCopy, 0, aCopy.length);
+        aAsciiString.copy(0, aCopy, 0, aCopy.length);
-        ByteString aByteStringCopy = new ByteString(aCopy, false);
+        AsciiString aAsciiStringCopy = new AsciiString(aCopy, false);
-        assertEquals(aByteString, aByteStringCopy);
+        assertEquals(aAsciiString, aAsciiStringCopy);
     }
 }

microbench/src/main/java/io/netty/microbench/headers/HeadersBenchmark.java

@@ -19,8 +19,6 @@ import io.netty.handler.codec.http.DefaultHttpHeaders;
 import io.netty.handler.codec.http2.DefaultHttp2Headers;
 import io.netty.microbench.util.AbstractMicrobenchmark;
 import io.netty.util.AsciiString;
-import io.netty.util.ByteString;
-import io.netty.util.CharsetUtil;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
 import org.openjdk.jmh.annotations.Level;
@@ -53,9 +51,6 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
     AsciiString[] httpNames;
     AsciiString[] httpValues;
 
-    ByteString[] http2Names;
-    ByteString[] http2Values;
-
     DefaultHttpHeaders httpHeaders;
     DefaultHttp2Headers http2Headers;
 
@@ -64,8 +59,6 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
         Map<String, String> headers = ExampleHeaders.EXAMPLES.get(exampleHeader);
         httpNames = new AsciiString[headers.size()];
         httpValues = new AsciiString[headers.size()];
-        http2Names = new ByteString[headers.size()];
-        http2Values = new ByteString[headers.size()];
         httpHeaders = new DefaultHttpHeaders(false);
         http2Headers = new DefaultHttp2Headers(false);
         int idx = 0;
@@ -74,11 +67,9 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
             String value = header.getValue();
             httpNames[idx] = new AsciiString(name);
             httpValues[idx] = new AsciiString(value);
-            http2Names[idx] = new ByteString(name, CharsetUtil.US_ASCII);
-            http2Values[idx] = new ByteString(value, CharsetUtil.US_ASCII);
             idx++;
             httpHeaders.add(new AsciiString(name), new AsciiString(value));
-            http2Headers.add(new ByteString(name, CharsetUtil.US_ASCII), new ByteString(value, CharsetUtil.US_ASCII));
+            http2Headers.add(new AsciiString(name), new AsciiString(value));
         }
     }
 
@@ -120,7 +111,7 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
     @Benchmark
     @BenchmarkMode(Mode.AverageTime)
     public void http2Remove(Blackhole bh) {
-        for (ByteString name : http2Names) {
+        for (AsciiString name : httpNames) {
             bh.consume(http2Headers.remove(name));
         }
     }
@@ -128,7 +119,7 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
     @Benchmark
     @BenchmarkMode(Mode.AverageTime)
     public void http2Get(Blackhole bh) {
-        for (ByteString name : http2Names) {
+        for (AsciiString name : httpNames) {
             bh.consume(http2Headers.get(name));
         }
     }
@@ -146,7 +137,7 @@ public class HeadersBenchmark extends AbstractMicrobenchmark {
     @Benchmark
     @BenchmarkMode(Mode.AverageTime)
     public void http2Iterate(Blackhole bh) {
-        for (Entry<ByteString, ByteString> entry : http2Headers) {
+        for (Entry<CharSequence, CharSequence> entry : http2Headers) {
             bh.consume(entry);
         }
     }