/*
* Copyright 2011 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 org.jboss.netty.buffer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
/**
* A dynamic capacity buffer which increases its capacity as needed. It is
* recommended to use {@link ChannelBuffers#dynamicBuffer(int)} instead of
* calling the constructor explicitly.
*/
public class DynamicChannelBuffer extends AbstractChannelBuffer {
private final ChannelBufferFactory factory;
private final ByteOrder endianness;
private ChannelBuffer buffer;
public DynamicChannelBuffer(int estimatedLength) {
this(ByteOrder.BIG_ENDIAN, estimatedLength);
}
public DynamicChannelBuffer(ByteOrder endianness, int estimatedLength) {
this(endianness, estimatedLength, HeapChannelBufferFactory.getInstance(endianness));
}
public DynamicChannelBuffer(ByteOrder endianness, int estimatedLength, ChannelBufferFactory factory) {
if (estimatedLength < 0) {
throw new IllegalArgumentException("estimatedLength: " + estimatedLength);
}
if (endianness == null) {
throw new NullPointerException("endianness");
}
if (factory == null) {
throw new NullPointerException("factory");
}
this.factory = factory;
this.endianness = endianness;
buffer = factory.getBuffer(order(), estimatedLength);
}
@Override
public void ensureWritableBytes(int minWritableBytes) {
if (minWritableBytes <= writableBytes()) {
return;
}
int newCapacity;
if (capacity() == 0) {
newCapacity = 1;
} else {
newCapacity = capacity();
}
int minNewCapacity = writerIndex() + minWritableBytes;
while (newCapacity < minNewCapacity) {
newCapacity <<= 1;
// Check if we exceeded the maximum size of 2gb if this is the case then
// newCapacity == 0
//
// https://github.com/netty/netty/issues/258
if (newCapacity == 0) {
throw new IllegalStateException("Maximum size of 2gb exceeded");
}
}
ChannelBuffer newBuffer = factory().getBuffer(order(), newCapacity);
newBuffer.writeBytes(buffer, 0, writerIndex());
buffer = newBuffer;
}
public ChannelBufferFactory factory() {
return factory;
}
public ByteOrder order() {
return endianness;
}
public boolean isDirect() {
return buffer.isDirect();
}
public int capacity() {
return buffer.capacity();
}
public boolean hasArray() {
return buffer.hasArray();
}
public byte[] array() {
return buffer.array();
}
public int arrayOffset() {
return buffer.arrayOffset();
}
public byte getByte(int index) {
return buffer.getByte(index);
}
public short getShort(int index) {
return buffer.getShort(index);
}
public int getUnsignedMedium(int index) {
return buffer.getUnsignedMedium(index);
}
public int getInt(int index) {
return buffer.getInt(index);
}
public long getLong(int index) {
return buffer.getLong(index);
}
public void getBytes(int index, byte[] dst, int dstIndex, int length) {
buffer.getBytes(index, dst, dstIndex, length);
}
public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
buffer.getBytes(index, dst, dstIndex, length);
}
public void getBytes(int index, ByteBuffer dst) {
buffer.getBytes(index, dst);
}
public int getBytes(int index, GatheringByteChannel out, int length)
throws IOException {
return buffer.getBytes(index, out, length);
}
public void getBytes(int index, OutputStream out, int length)
throws IOException {
buffer.getBytes(index, out, length);
}
public void setByte(int index, int value) {
buffer.setByte(index, value);
}
public void setShort(int index, int value) {
buffer.setShort(index, value);
}
public void setMedium(int index, int value) {
buffer.setMedium(index, value);
}
public void setInt(int index, int value) {
buffer.setInt(index, value);
}
public void setLong(int index, long value) {
buffer.setLong(index, value);
}
public void setBytes(int index, byte[] src, int srcIndex, int length) {
buffer.setBytes(index, src, srcIndex, length);
}
public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
buffer.setBytes(index, src, srcIndex, length);
}
public void setBytes(int index, ByteBuffer src) {
buffer.setBytes(index, src);
}
public int setBytes(int index, InputStream in, int length)
throws IOException {
return buffer.setBytes(index, in, length);
}
public int setBytes(int index, ScatteringByteChannel in, int length)
throws IOException {
return buffer.setBytes(index, in, length);
}
@Override
public void writeByte(int value) {
ensureWritableBytes(1);
super.writeByte(value);
}
@Override
public void writeShort(int value) {
ensureWritableBytes(2);
super.writeShort(value);
}
@Override
public void writeMedium(int value) {
ensureWritableBytes(3);
super.writeMedium(value);
}
@Override
public void writeInt(int value) {
ensureWritableBytes(4);
super.writeInt(value);
}
@Override
public void writeLong(long value) {
ensureWritableBytes(8);
super.writeLong(value);
}
@Override
public void writeBytes(byte[] src, int srcIndex, int length) {
ensureWritableBytes(length);
super.writeBytes(src, srcIndex, length);
}
@Override
public void writeBytes(ChannelBuffer src, int srcIndex, int length) {
ensureWritableBytes(length);
super.writeBytes(src, srcIndex, length);
}
@Override
public void writeBytes(ByteBuffer src) {
ensureWritableBytes(src.remaining());
super.writeBytes(src);
}
@Override
public int writeBytes(InputStream in, int length) throws IOException {
ensureWritableBytes(length);
return super.writeBytes(in, length);
}
@Override
public int writeBytes(ScatteringByteChannel in, int length)
throws IOException {
ensureWritableBytes(length);
return super.writeBytes(in, length);
}
@Override
public void writeZero(int length) {
ensureWritableBytes(length);
super.writeZero(length);
}
public ChannelBuffer duplicate() {
return new DuplicatedChannelBuffer(this);
}
public ChannelBuffer copy(int index, int length) {
DynamicChannelBuffer copiedBuffer = new DynamicChannelBuffer(order(), Math.max(length, 64), factory());
copiedBuffer.buffer = buffer.copy(index, length);
copiedBuffer.setIndex(0, length);
return copiedBuffer;
}
public ChannelBuffer slice(int index, int length) {
if (index == 0) {
if (length == 0) {
return ChannelBuffers.EMPTY_BUFFER;
}
return new TruncatedChannelBuffer(this, length);
} else {
if (length == 0) {
return ChannelBuffers.EMPTY_BUFFER;
}
return new SlicedChannelBuffer(this, index, length);
}
}
public ByteBuffer toByteBuffer(int index, int length) {
return buffer.toByteBuffer(index, length);
}
}