use checkPositive/checkPositiveOrZero (#8835)

Motivation:

We can replace some "hand-rolled" integer checks with our own static utility method to simplify the code.

Modifications:

Use methods provided by `ObjectUtil`.

Result:

Cleaner code and less duplication

codec-dns/src/main/java/io/netty/handler/codec/dns/AbstractDnsRecord.java

@@ -21,6 +21,7 @@ import io.netty.util.internal.UnstableApi;
 import java.net.IDN;
 
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 
 /**
  * A skeletal implementation of {@link DnsRecord}.
@@ -62,9 +63,7 @@ public abstract class AbstractDnsRecord implements DnsRecord {
      * @param timeToLive the TTL value of the record
      */
     protected AbstractDnsRecord(String name, DnsRecordType type, int dnsClass, long timeToLive) {
-        if (timeToLive < 0) {
+        checkPositiveOrZero(timeToLive, "timeToLive");
-            throw new IllegalArgumentException("timeToLive: " + timeToLive + " (expected: >= 0)");
-        }
         // Convert to ASCII which will also check that the length is not too big.
         // See:
         //   - https://github.com/netty/netty/issues/4937

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

@@ -372,8 +372,7 @@ public class DefaultHttpHeaders extends HttpHeaders {
         default:
             // Check to see if the character is not an ASCII character, or invalid
             if (value < 0) {
-                throw new IllegalArgumentException("a header name cannot contain non-ASCII character: " +
+                throw new IllegalArgumentException("a header name cannot contain non-ASCII character: " + value);
-                        value);
             }
         }
     }

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

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.http;
 
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandlerContext;
@@ -168,21 +170,10 @@ public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
     protected HttpObjectDecoder(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,
             boolean chunkedSupported, boolean validateHeaders, int initialBufferSize) {
-        if (maxInitialLineLength <= 0) {
+        checkPositive(maxInitialLineLength, "maxInitialLineLength");
-            throw new IllegalArgumentException(
+        checkPositive(maxHeaderSize, "maxHeaderSize");
-                    "maxInitialLineLength must be a positive integer: " +
+        checkPositive(maxChunkSize, "maxChunkSize");
-                     maxInitialLineLength);
+
-        }
-        if (maxHeaderSize <= 0) {
-            throw new IllegalArgumentException(
-                    "maxHeaderSize must be a positive integer: " +
-                    maxHeaderSize);
-        }
-        if (maxChunkSize <= 0) {
-            throw new IllegalArgumentException(
-                    "maxChunkSize must be a positive integer: " +
-                    maxChunkSize);
-        }
         AppendableCharSequence seq = new AppendableCharSequence(initialBufferSize);
         lineParser = new LineParser(seq, maxInitialLineLength);
         headerParser = new HeaderParser(seq, maxHeaderSize);

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

@@ -22,6 +22,7 @@ import io.netty.util.CharsetUtil;
 
 import static io.netty.handler.codec.http.HttpConstants.SP;
 import static io.netty.util.ByteProcessor.FIND_ASCII_SPACE;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Integer.parseInt;
 
 /**
@@ -538,10 +539,7 @@ public class HttpResponseStatus implements Comparable<HttpResponseStatus> {
     }
 
     private HttpResponseStatus(int code, String reasonPhrase, boolean bytes) {
-        if (code < 0) {
+        checkPositiveOrZero(code, "code");
-            throw new IllegalArgumentException(
-                    "code: " + code + " (expected: 0+)");
-        }
 
         if (reasonPhrase == null) {
             throw new NullPointerException("reasonPhrase");

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

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.http;
 
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.buffer.ByteBuf;
 import io.netty.util.CharsetUtil;
 
@@ -165,12 +167,8 @@ public class HttpVersion implements Comparable<HttpVersion> {
             }
         }
 
-        if (majorVersion < 0) {
+        checkPositiveOrZero(majorVersion, "majorVersion");
-            throw new IllegalArgumentException("negative majorVersion");
+        checkPositiveOrZero(minorVersion, "minorVersion");
-        }
-        if (minorVersion < 0) {
-            throw new IllegalArgumentException("negative minorVersion");
-        }
 
         this.protocolName = protocolName;
         this.majorVersion = majorVersion;

codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java

@@ -128,8 +128,7 @@ public abstract class AbstractMemoryHttpData extends AbstractHttpData {
         }
         long newsize = file.length();
         if (newsize > Integer.MAX_VALUE) {
-            throw new IllegalArgumentException(
+            throw new IllegalArgumentException("File too big to be loaded in memory");
-                    "File too big to be loaded in memory");
         }
         checkSize(newsize);
         FileInputStream inputStream = new FileInputStream(file);

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

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.spdy;
 
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.util.internal.StringUtil;
 
 /**
@@ -62,10 +64,7 @@ public class DefaultSpdyGoAwayFrame implements SpdyGoAwayFrame {
 
     @Override
     public SpdyGoAwayFrame setLastGoodStreamId(int lastGoodStreamId) {
-        if (lastGoodStreamId < 0) {
+        checkPositiveOrZero(lastGoodStreamId, "lastGoodStreamId");
-            throw new IllegalArgumentException("Last-good-stream-ID"
-                    + " cannot be negative: " + lastGoodStreamId);
-        }
         this.lastGoodStreamId = lastGoodStreamId;
         return this;
     }

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

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.spdy;
 
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+
 /**
  * The default {@link SpdyStreamFrame} implementation.
  */
@@ -39,10 +41,7 @@ public abstract class DefaultSpdyStreamFrame implements SpdyStreamFrame {
 
     @Override
     public SpdyStreamFrame setStreamId(int streamId) {
-        if (streamId <= 0) {
+        checkPositive(streamId, "streamId");
-            throw new IllegalArgumentException(
-                    "Stream-ID must be positive: " + streamId);
-        }
         this.streamId = streamId;
         return this;
     }

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

@@ -20,8 +20,7 @@ import io.netty.util.internal.StringUtil;
 /**
  * The default {@link SpdySynReplyFrame} implementation.
  */
-public class DefaultSpdySynReplyFrame extends DefaultSpdyHeadersFrame
+public class DefaultSpdySynReplyFrame extends DefaultSpdyHeadersFrame implements SpdySynReplyFrame {
-        implements SpdySynReplyFrame {
 
     /**
      * Creates a new instance.

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

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.spdy;
 
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.util.internal.StringUtil;
 
 /**
@@ -77,11 +79,7 @@ public class DefaultSpdySynStreamFrame extends DefaultSpdyHeadersFrame
 
     @Override
     public SpdySynStreamFrame setAssociatedStreamId(int associatedStreamId) {
-        if (associatedStreamId < 0) {
+        checkPositiveOrZero(associatedStreamId, "associatedStreamId");
-            throw new IllegalArgumentException(
-                    "Associated-To-Stream-ID cannot be negative: " +
-                    associatedStreamId);
-        }
         this.associatedStreamId = associatedStreamId;
         return this;
     }

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

@@ -15,6 +15,9 @@
  */
 package io.netty.handler.codec.spdy;
 
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.util.internal.StringUtil;
 
 /**
@@ -43,10 +46,7 @@ public class DefaultSpdyWindowUpdateFrame implements SpdyWindowUpdateFrame {
 
     @Override
     public SpdyWindowUpdateFrame setStreamId(int streamId) {
-        if (streamId < 0) {
+        checkPositiveOrZero(streamId, "streamId");
-            throw new IllegalArgumentException(
-                    "Stream-ID cannot be negative: " + streamId);
-        }
         this.streamId = streamId;
         return this;
     }
@@ -58,11 +58,7 @@ public class DefaultSpdyWindowUpdateFrame implements SpdyWindowUpdateFrame {
 
     @Override
     public SpdyWindowUpdateFrame setDeltaWindowSize(int deltaWindowSize) {
-        if (deltaWindowSize <= 0) {
+        checkPositive(deltaWindowSize, "deltaWindowSize");
-            throw new IllegalArgumentException(
-                    "Delta-Window-Size must be positive: " +
-                    deltaWindowSize);
-        }
         this.deltaWindowSize = deltaWindowSize;
         return this;
     }

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

@@ -38,6 +38,8 @@ import static io.netty.handler.codec.spdy.SpdyCodecUtil.getSignedInt;
 import static io.netty.handler.codec.spdy.SpdyCodecUtil.getUnsignedInt;
 import static io.netty.handler.codec.spdy.SpdyCodecUtil.getUnsignedMedium;
 import static io.netty.handler.codec.spdy.SpdyCodecUtil.getUnsignedShort;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 
@@ -95,10 +97,7 @@ public class SpdyFrameDecoder {
         if (delegate == null) {
             throw new NullPointerException("delegate");
         }
-        if (maxChunkSize <= 0) {
+        checkPositive(maxChunkSize, "maxChunkSize");
-            throw new IllegalArgumentException(
-                    "maxChunkSize must be a positive integer: " + maxChunkSize);
-        }
         this.spdyVersion = spdyVersion.getVersion();
         this.delegate = delegate;
         this.maxChunkSize = maxChunkSize;

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

@@ -38,6 +38,7 @@ import java.util.List;
 import java.util.Map;
 
 import static io.netty.handler.codec.spdy.SpdyHeaders.HttpNames.*;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
 
 /**
  * Decodes {@link SpdySynStreamFrame}s, {@link SpdySynReplyFrame}s,
@@ -103,10 +104,7 @@ public class SpdyHttpDecoder extends MessageToMessageDecoder<SpdyFrame> {
         if (version == null) {
             throw new NullPointerException("version");
         }
-        if (maxContentLength <= 0) {
+        checkPositive(maxContentLength, "maxContentLength");
-            throw new IllegalArgumentException(
-                    "maxContentLength must be a positive integer: " + maxContentLength);
-        }
         spdyVersion = version.getVersion();
         this.maxContentLength = maxContentLength;
         this.messageMap = messageMap;

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

@@ -26,6 +26,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 import static io.netty.handler.codec.spdy.SpdyCodecUtil.SPDY_SESSION_STREAM_ID;
 import static io.netty.handler.codec.spdy.SpdyCodecUtil.isServerId;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 
 /**
  * Manages streams within a SPDY session.
@@ -77,9 +78,7 @@ public class SpdySessionHandler extends ChannelDuplexHandler {
     }
 
     public void setSessionReceiveWindowSize(int sessionReceiveWindowSize) {
-      if (sessionReceiveWindowSize < 0) {
+        checkPositiveOrZero(sessionReceiveWindowSize, "sessionReceiveWindowSize");
-        throw new IllegalArgumentException("sessionReceiveWindowSize");
-      }
         // This will not send a window update frame immediately.
         // If this value increases the allowed receive window size,
         // a WINDOW_UPDATE frame will be sent when only half of the

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2ConnectionEncoder.java

@@ -30,6 +30,7 @@ import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_PRIORITY_WEIGH
 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 static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Integer.MAX_VALUE;
 import static java.lang.Math.min;
 
@@ -543,9 +544,7 @@ public class DefaultHttp2ConnectionEncoder implements Http2ConnectionEncoder {
 
         FlowControlledBase(final Http2Stream stream, int padding, boolean endOfStream,
                 final ChannelPromise promise) {
-            if (padding < 0) {
+            checkPositiveOrZero(padding, "padding");
-                throw new IllegalArgumentException("padding must be >= 0");
-            }
             this.padding = padding;
             this.endOfStream = endOfStream;
             this.stream = stream;

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriter.java

@@ -61,6 +61,8 @@ import static io.netty.handler.codec.http2.Http2FrameTypes.RST_STREAM;
 import static io.netty.handler.codec.http2.Http2FrameTypes.SETTINGS;
 import static io.netty.handler.codec.http2.Http2FrameTypes.WINDOW_UPDATE;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
@@ -614,15 +616,11 @@ public class DefaultHttp2FrameWriter implements Http2FrameWriter, Http2FrameSize
     }
 
     private static void verifyStreamId(int streamId, String argumentName) {
-        if (streamId <= 0) {
+        checkPositive(streamId, "streamId");
-            throw new IllegalArgumentException(argumentName + " must be > 0");
-        }
     }
 
     private static void verifyStreamOrConnectionId(int streamId, String argumentName) {
-        if (streamId < 0) {
+        checkPositiveOrZero(streamId, "streamId");
-            throw new IllegalArgumentException(argumentName + " must be >= 0");
-        }
     }
 
     private static void verifyWeight(short weight) {
@@ -638,9 +636,7 @@ public class DefaultHttp2FrameWriter implements Http2FrameWriter, Http2FrameSize
     }
 
     private static void verifyWindowSizeIncrement(int windowSizeIncrement) {
-        if (windowSizeIncrement < 0) {
+        checkPositiveOrZero(windowSizeIncrement, "windowSizeIncrement");
-            throw new IllegalArgumentException("WindowSizeIncrement must be >= 0");
-        }
     }
 
     private static void verifyPingPayload(ByteBuf data) {

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2GoAwayFrame.java

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.http2;
 
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.DefaultByteBufHolder;
 import io.netty.buffer.Unpooled;
@@ -98,9 +100,7 @@ public final class DefaultHttp2GoAwayFrame extends DefaultByteBufHolder implemen
 
     @Override
     public Http2GoAwayFrame setExtraStreamIds(int extraStreamIds) {
-        if (extraStreamIds < 0) {
+        checkPositiveOrZero(extraStreamIds, "extraStreamIds");
-            throw new IllegalArgumentException("extraStreamIds must be non-negative");
-        }
         this.extraStreamIds = extraStreamIds;
         return this;
     }

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2LocalFlowController.java

@@ -24,6 +24,7 @@ import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
 import static io.netty.handler.codec.http2.Http2Exception.streamError;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 import io.netty.buffer.ByteBuf;
@@ -173,9 +174,7 @@ public class DefaultHttp2LocalFlowController implements Http2LocalFlowController
     @Override
     public boolean consumeBytes(Http2Stream stream, int numBytes) throws Http2Exception {
         assert ctx != null && ctx.executor().inEventLoop();
-        if (numBytes < 0) {
+        checkPositiveOrZero(numBytes, "numBytes");
-            throw new IllegalArgumentException("numBytes must not be negative");
-        }
         if (numBytes == 0) {
             return false;
         }

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2RemoteFlowController.java

@@ -31,6 +31,7 @@ import static io.netty.handler.codec.http2.Http2Error.STREAM_CLOSED;
 import static io.netty.handler.codec.http2.Http2Exception.streamError;
 import static io.netty.handler.codec.http2.Http2Stream.State.HALF_CLOSED_LOCAL;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
@@ -635,9 +636,7 @@ public class DefaultHttp2RemoteFlowController implements Http2RemoteFlowControll
         }
 
         void initialWindowSize(int newWindowSize) throws Http2Exception {
-            if (newWindowSize < 0) {
+            checkPositiveOrZero(newWindowSize, "newWindowSize");
-                throw new IllegalArgumentException("Invalid initial window size: " + newWindowSize);
-            }
 
             final int delta = newWindowSize - initialWindowSize;
             initialWindowSize = newWindowSize;

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

@@ -33,6 +33,7 @@ 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 static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 
 /**
  * A HTTP2 frame listener that will decompress data frames according to the {@code content-encoding} header for each
@@ -398,9 +399,7 @@ public class DelegatingDecompressorFrameListener extends Http2FrameListenerDecor
          * @return The number of pre-decompressed bytes that have been consumed.
          */
         int consumeBytes(int streamId, int decompressedBytes) throws Http2Exception {
-            if (decompressedBytes < 0) {
+            checkPositiveOrZero(decompressedBytes, "decompressedBytes");
-                throw new IllegalArgumentException("decompressedBytes must not be negative: " + decompressedBytes);
-            }
             if (decompressed - decompressedBytes < 0) {
                 throw streamError(streamId, INTERNAL_ERROR,
                         "Attempting to return too many bytes for stream %d. decompressed: %d " +

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

@@ -24,6 +24,7 @@ import static io.netty.handler.codec.http2.Http2CodecUtil.streamableBytes;
 import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
 import static io.netty.util.internal.ObjectUtil.checkNotNull;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
@@ -72,9 +73,7 @@ public final class UniformStreamByteDistributor implements StreamByteDistributor
      * Must be > 0.
      */
     public void minAllocationChunk(int minAllocationChunk) {
-        if (minAllocationChunk <= 0) {
+        checkPositive(minAllocationChunk, "minAllocationChunk");
-            throw new IllegalArgumentException("minAllocationChunk must be > 0");
-        }
         this.minAllocationChunk = minAllocationChunk;
     }
 

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

@@ -37,6 +37,8 @@ import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_PRIORITY_WEIGH
 import static io.netty.handler.codec.http2.Http2CodecUtil.streamableBytes;
 import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
 import static java.lang.Integer.MAX_VALUE;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
@@ -96,9 +98,8 @@ public final class WeightedFairQueueByteDistributor implements StreamByteDistrib
     }
 
     public WeightedFairQueueByteDistributor(Http2Connection connection, int maxStateOnlySize) {
-        if (maxStateOnlySize < 0) {
+        checkPositiveOrZero(maxStateOnlySize, "maxStateOnlySize");
-            throw new IllegalArgumentException("maxStateOnlySize: " + maxStateOnlySize + " (expected: >0)");
+        if (maxStateOnlySize == 0) {
-        } else if (maxStateOnlySize == 0) {
             stateOnlyMap = IntCollections.emptyMap();
             stateOnlyRemovalQueue = EmptyPriorityQueue.instance();
         } else {
@@ -281,9 +282,7 @@ public final class WeightedFairQueueByteDistributor implements StreamByteDistrib
      * @param allocationQuantum the amount of bytes that will be allocated to each stream. Must be &gt; 0.
      */
     public void allocationQuantum(int allocationQuantum) {
-        if (allocationQuantum <= 0) {
+        checkPositive(allocationQuantum, "allocationQuantum");
-            throw new IllegalArgumentException("allocationQuantum must be > 0");
-        }
         this.allocationQuantum = allocationQuantum;
     }
 

codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/AbstractBinaryMemcacheDecoder.java

@@ -15,6 +15,8 @@
  */
 package io.netty.handler.codec.memcache.binary;
 
+import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
+
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandlerContext;
@@ -59,9 +61,7 @@ public abstract class AbstractBinaryMemcacheDecoder<M extends BinaryMemcacheMess
      * @param chunkSize the maximum chunk size of the payload.
      */
     protected AbstractBinaryMemcacheDecoder(int chunkSize) {
-        if (chunkSize < 0) {
+        checkPositiveOrZero(chunkSize, "chunkSize");
-            throw new IllegalArgumentException("chunkSize must be a positive integer: " + chunkSize);
-        }
 
         this.chunkSize = chunkSize;
     }

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

@@ -30,6 +30,7 @@ import io.netty.util.internal.AppendableCharSequence;
 
 import static io.netty.buffer.ByteBufUtil.indexOf;
 import static io.netty.buffer.ByteBufUtil.readBytes;
+import static io.netty.util.internal.ObjectUtil.checkPositive;
 
 /**
  * Decodes {@link ByteBuf}s into {@link StompHeadersSubframe}s and
@@ -90,16 +91,8 @@ public class StompSubframeDecoder extends ReplayingDecoder<State> {
 
     public StompSubframeDecoder(int maxLineLength, int maxChunkSize, boolean validateHeaders) {
         super(State.SKIP_CONTROL_CHARACTERS);
-        if (maxLineLength <= 0) {
+        checkPositive(maxLineLength, "maxLineLength");
-            throw new IllegalArgumentException(
+        checkPositive(maxChunkSize, "maxChunkSize");
-                    "maxLineLength must be a positive integer: " +
-                            maxLineLength);
-        }
-        if (maxChunkSize <= 0) {
-            throw new IllegalArgumentException(
-                    "maxChunkSize must be a positive integer: " +
-                            maxChunkSize);
-        }
         this.maxChunkSize = maxChunkSize;
         this.maxLineLength = maxLineLength;
         this.validateHeaders = validateHeaders;