Added messages to all IndexOutOfBoundsExceptions

I need to implement this to help myself finish more future pull requests which, so far, are plagued by these exceptions with no information available.

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

@@ -42,7 +42,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void readerIndex(int readerIndex) {
         if (readerIndex < 0 || readerIndex > writerIndex) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid readerIndex: " 
+                    + readerIndex + " - Maximum is " + writerIndex);
         }
         this.readerIndex = readerIndex;
     }
@@ -55,7 +56,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void writerIndex(int writerIndex) {
         if (writerIndex < readerIndex || writerIndex > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid writerIndex: " 
+                    + writerIndex + " - Maximum is " + readerIndex + " or " + capacity());
         }
         this.writerIndex = writerIndex;
     }
@@ -63,7 +65,9 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void setIndex(int readerIndex, int writerIndex) {
         if (readerIndex < 0 || readerIndex > writerIndex || writerIndex > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid indexes: readerIndex is "
+                    + readerIndex + ", writerIndex is "
+                    + writerIndex + ", capacity is " + capacity());
         }
         this.readerIndex = readerIndex;
         this.writerIndex = writerIndex;
@@ -129,7 +133,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void ensureWritableBytes(int writableBytes) {
         if (writableBytes > writableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Writable bytes exceeded: Got " 
+                    + writableBytes + ", maximum is " + writableBytes());
         }
     }
     
@@ -190,7 +195,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void getBytes(int index, ChannelBuffer dst, int length) {
         if (length > dst.writableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read: Need "
+                    + length + ", maximum is " + dst.writableBytes());
         }
         getBytes(index, dst, dst.writerIndex(), length);
         dst.writerIndex(dst.writerIndex() + length);
@@ -229,7 +235,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void setBytes(int index, ChannelBuffer src, int length) {
         if (length > src.readableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to write: Need "
+                    + length + ", maximum is " + src.readableBytes());
         }
         setBytes(index, src, src.readerIndex(), length);
         src.readerIndex(src.readerIndex() + length);
@@ -271,7 +278,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public byte readByte() {
         if (readerIndex == writerIndex) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Readable byte limit exceeded: "
+                    + readerIndex);
         }
         return getByte(readerIndex ++);
     }
@@ -391,7 +399,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void readBytes(ChannelBuffer dst, int length) {
         if (length > dst.writableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read: Need "
+                    + length + ", maximum is " + dst.writableBytes());
         }
         readBytes(dst, dst.writerIndex(), length);
         dst.writerIndex(dst.writerIndex() + length);
@@ -432,7 +441,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     public void skipBytes(int length) {
         int newReaderIndex = readerIndex + length;
         if (newReaderIndex > writerIndex) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Readable bytes exceeded - Need "
+                    + newReaderIndex + ", maximum is " + writerIndex);
         }
         readerIndex = newReaderIndex;
     }
@@ -505,7 +515,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
     @Override
     public void writeBytes(ChannelBuffer src, int length) {
         if (length > src.readableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to write - Need "
+                    + length + ", maximum is " + src.readableBytes());
         }
         writeBytes(src, src.readerIndex(), length);
         src.readerIndex(src.readerIndex() + length);
@@ -697,7 +708,8 @@ public abstract class AbstractChannelBuffer implements ChannelBuffer {
      */
     protected void checkReadableBytes(int minimumReadableBytes) {
         if (readableBytes() < minimumReadableBytes) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Not enough readable bytes - Need "
+                    + minimumReadableBytes + ", maximum is " + readableBytes());
         }
     }
 }

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

@@ -130,7 +130,8 @@ public class BigEndianHeapChannelBuffer extends HeapChannelBuffer {
     @Override
     public ChannelBuffer copy(int index, int length) {
         if (index < 0 || length < 0 || index + length > array.length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to copy - Need "
+                    + (index + length) + ", maximum is " + array.length);
         }
 
         byte[] copiedArray = new byte[length];

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

@@ -143,7 +143,8 @@ public class ByteBufferBackedChannelBuffer extends AbstractChannelBuffer {
         try {
             data.limit(index + length).position(index);
         } catch (IllegalArgumentException e) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to read - Need "
+                    + (index + length) + ", maximum is " + data.limit());
         }
         data.get(dst, dstIndex, length);
     }
@@ -155,7 +156,8 @@ public class ByteBufferBackedChannelBuffer extends AbstractChannelBuffer {
         try {
             data.limit(index + bytesToCopy).position(index);
         } catch (IllegalArgumentException e) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to read - Need "
+                    + (index + bytesToCopy) + ", maximum is " + data.limit());
         }
         dst.put(data);
     }
@@ -351,7 +353,8 @@ public class ByteBufferBackedChannelBuffer extends AbstractChannelBuffer {
         try {
             src = (ByteBuffer) buffer.duplicate().position(index).limit(index + length);
         } catch (IllegalArgumentException e) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to read - Need "
+                    + (index + length));
         }
 
         ByteBuffer dst = buffer.isDirect() ? ByteBuffer.allocateDirect(length) : ByteBuffer.allocate(length);

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

@@ -69,7 +69,8 @@ public class ChannelBufferInputStream extends InputStream implements DataInput {
             throw new IllegalArgumentException("length: " + length);
         }
         if (length > buffer.readableBytes()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read - Needs "
+                    + length + ", maximum is " + buffer.readableBytes());
         }
 
         this.buffer = buffer;
@@ -237,10 +238,11 @@ public class ChannelBufferInputStream extends InputStream implements DataInput {
 
     private void checkAvailable(int fieldSize) throws IOException {
         if (fieldSize < 0) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("fieldSize cannot be a negative number");
         }
         if (fieldSize > available()) {
-            throw new EOFException();
+            throw new EOFException("fieldSize is too long! Length is " + fieldSize 
+                    + ", but maximum is " + available());
         }
     }
 }

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

@@ -55,7 +55,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
         }
 
         if (index + length > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to decompose - Need "
+                    + (index + length) + ", capacity is " + capacity());
         }
 
         int componentId = componentId(index);
@@ -228,7 +229,9 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public void getBytes(int index, byte[] dst, int dstIndex, int length) {
         int componentId = componentId(index);
         if (index > capacity() - length || dstIndex > dst.length - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to read - Needs "
+                    + (index + length) + ", maximum is " + capacity() + " or " 
+                    + dst.length);
         }
 
         int i = componentId;
@@ -250,7 +253,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
         int limit = dst.limit();
         int length = dst.remaining();
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read - Needs "
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         int i = componentId;
@@ -274,7 +278,9 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
         int componentId = componentId(index);
         if (index > capacity() - length || dstIndex > dst.capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read - Needs "
+                    + (index + length) + " or " + (dstIndex + length) + ", maximum is "
+                    + capacity() + " or " + dst.capacity());
         }
 
         int i = componentId;
@@ -307,7 +313,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
             throws IOException {
         int componentId = componentId(index);
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be read - needs " 
+                    + (index + length) + ", maximum of " + capacity());
         }
 
         int i = componentId;
@@ -388,7 +395,9 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public void setBytes(int index, byte[] src, int srcIndex, int length) {
         int componentId = componentId(index);
         if (index > capacity() - length || srcIndex > src.length - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to read - needs "
+                    + (index + length) + " or " + (srcIndex + length) + ", maximum is "
+                    + capacity() + " or " + src.length);
         }
 
         int i = componentId;
@@ -410,7 +419,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
         int limit = src.limit();
         int length = src.remaining();
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be written - Needs "
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         int i = componentId;
@@ -434,7 +444,9 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
         int componentId = componentId(index);
         if (index > capacity() - length || srcIndex > src.capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to be written - Needs "
+                    + (index + length) + " or " + (srcIndex + length) + ", maximum is "
+                    + capacity() + " or " + src.capacity());
         }
 
         int i = componentId;
@@ -455,7 +467,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
             throws IOException {
         int componentId = componentId(index);
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to write - Needs "
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         int i = componentId;
@@ -494,7 +507,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
             throws IOException {
         int componentId = componentId(index);
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to write - Needs "
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         int i = componentId;
@@ -531,7 +545,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public ChannelBuffer copy(int index, int length) {
         int componentId = componentId(index);
         if (index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to copy - Needs "
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         ChannelBuffer dst = factory().getBuffer(order(), length);
@@ -564,7 +579,9 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
                 return ChannelBuffers.EMPTY_BUFFER;
             }
         } else if (index < 0 || index > capacity() - length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid index: " + index
+                    + " - Bytes needed: " + (index + length) + ", maximum is "
+                    + capacity());
         } else if (length == 0) {
             return ChannelBuffers.EMPTY_BUFFER;
         }
@@ -599,7 +616,8 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
     public ByteBuffer[] toByteBuffers(int index, int length) {
         int componentId = componentId(index);
         if (index + length > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Too many bytes to convert - Needs"
+                    + (index + length) + ", maximum is " + capacity());
         }
 
         List<ByteBuffer> buffers = new ArrayList<ByteBuffer>(components.length);
@@ -642,7 +660,7 @@ public class CompositeChannelBuffer extends AbstractChannelBuffer {
             }
         }
 
-        throw new IndexOutOfBoundsException();
+        throw new IndexOutOfBoundsException("Invalid index: " + index + ", maximum: " + indices.length);
     }
 
     @Override

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

@@ -130,7 +130,8 @@ public class LittleEndianHeapChannelBuffer extends HeapChannelBuffer {
     @Override
     public ChannelBuffer copy(int index, int length) {
         if (index < 0 || length < 0 || index + length > array.length) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Copy could not be completed. Bytes needed: "
+                    + (index + length) + ", maximum: " + array.length);
         }
 
         byte[] copiedArray = new byte[length];

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

@@ -38,11 +38,13 @@ public class SlicedChannelBuffer extends AbstractChannelBuffer implements Wrappe
 
     public SlicedChannelBuffer(ChannelBuffer buffer, int index, int length) {
         if (index < 0 || index > buffer.capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid index of " + index
+                    + ", maximum is " + buffer.capacity());
         }
 
         if (index + length > buffer.capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid combined index of "
+                    + (index + length) + ", maximum is " + buffer.capacity());
         }
 
         this.buffer = buffer;
@@ -245,7 +247,8 @@ public class SlicedChannelBuffer extends AbstractChannelBuffer implements Wrappe
 
     private void checkIndex(int index) {
         if (index < 0 || index >= capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid index: " + index
+                    + ", maximum is " + capacity());
         }
     }
 
@@ -255,10 +258,11 @@ public class SlicedChannelBuffer extends AbstractChannelBuffer implements Wrappe
                     "length is negative: " + length);
         }
         if (startIndex < 0) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("startIndex cannot be negative");
         }
         if (startIndex + length > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Index too big - Bytes needed: "
+                    + (startIndex + length) + ", maximum is " + capacity());
         }
     }
 }

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

@@ -37,7 +37,8 @@ public class TruncatedChannelBuffer extends AbstractChannelBuffer implements Wra
 
     public TruncatedChannelBuffer(ChannelBuffer buffer, int length) {
         if (length > buffer.capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Length is too large, got "
+                    + length + " but can't go higher than " + buffer.capacity());
         }
 
         this.buffer = buffer;
@@ -239,7 +240,8 @@ public class TruncatedChannelBuffer extends AbstractChannelBuffer implements Wra
 
     private void checkIndex(int index) {
         if (index < 0 || index >= capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid index of " + index
+                    + ", maximum is " + capacity());
         }
     }
 
@@ -249,7 +251,8 @@ public class TruncatedChannelBuffer extends AbstractChannelBuffer implements Wra
                     "length is negative: " + length);
         }
         if (index + length > capacity()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Invalid index of "
+                    + (index + length) + ", maximum is " + capacity());
         }
     }
 }