282 lines
8.1 KiB
Java
282 lines
8.1 KiB
Java
/*
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* JBoss, Home of Professional Open Source
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*
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* Copyright 2008, Red Hat Middleware LLC, and individual contributors
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* by the @author tags. See the COPYRIGHT.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jboss.netty.buffer;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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/**
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* A dynamic capacity buffer which increases its capacity as needed. It is
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* recommended to use {@link ChannelBuffers#dynamicBuffer(int)} instead of
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* calling the constructor explicitly.
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*
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* @author The Netty Project (netty-dev@lists.jboss.org)
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* @author Trustin Lee (tlee@redhat.com)
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*
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* @version $Rev$, $Date$
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*
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*/
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public class DynamicChannelBuffer extends AbstractChannelBuffer {
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private final ChannelBufferFactory factory;
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private final int initialCapacity;
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private final ByteOrder endianness;
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private ChannelBuffer buffer = ChannelBuffers.EMPTY_BUFFER;
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public DynamicChannelBuffer(int estimatedLength) {
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this(ByteOrder.BIG_ENDIAN, estimatedLength);
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}
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public DynamicChannelBuffer(ByteOrder endianness, int estimatedLength) {
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this(endianness, estimatedLength, HeapChannelBufferFactory.getInstance(endianness));
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}
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public DynamicChannelBuffer(ByteOrder endianness, int estimatedLength, ChannelBufferFactory factory) {
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if (estimatedLength < 0) {
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throw new IllegalArgumentException("estimatedLength: " + estimatedLength);
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}
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if (endianness == null) {
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throw new NullPointerException("endianness");
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}
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if (factory == null) {
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throw new NullPointerException("factory");
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}
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this.factory = factory;
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initialCapacity = estimatedLength;
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this.endianness = endianness;
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}
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public ChannelBufferFactory factory() {
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return factory;
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}
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public ByteOrder order() {
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return endianness;
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}
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public int capacity() {
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return buffer.capacity();
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}
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public byte getByte(int index) {
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return buffer.getByte(index);
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}
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public short getShort(int index) {
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return buffer.getShort(index);
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}
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public int getUnsignedMedium(int index) {
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return buffer.getUnsignedMedium(index);
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}
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public int getInt(int index) {
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return buffer.getInt(index);
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}
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public long getLong(int index) {
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return buffer.getLong(index);
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}
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public void getBytes(int index, byte[] dst, int dstIndex, int length) {
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buffer.getBytes(index, dst, dstIndex, length);
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}
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public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
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buffer.getBytes(index, dst, dstIndex, length);
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}
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public void getBytes(int index, ByteBuffer dst) {
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buffer.getBytes(index, dst);
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}
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public int getBytes(int index, GatheringByteChannel out, int length)
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throws IOException {
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return buffer.getBytes(index, out, length);
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}
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public void getBytes(int index, OutputStream out, int length)
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throws IOException {
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buffer.getBytes(index, out, length);
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}
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public void setByte(int index, byte value) {
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buffer.setByte(index, value);
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}
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public void setShort(int index, short value) {
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buffer.setShort(index, value);
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}
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public void setMedium(int index, int value) {
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buffer.setMedium(index, value);
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}
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public void setInt(int index, int value) {
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buffer.setInt(index, value);
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}
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public void setLong(int index, long value) {
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buffer.setLong(index, value);
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}
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public void setBytes(int index, byte[] src, int srcIndex, int length) {
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buffer.setBytes(index, src, srcIndex, length);
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}
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public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
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buffer.setBytes(index, src, srcIndex, length);
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}
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public void setBytes(int index, ByteBuffer src) {
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buffer.setBytes(index, src);
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}
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public int setBytes(int index, InputStream in, int length)
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throws IOException {
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return buffer.setBytes(index, in, length);
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}
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public int setBytes(int index, ScatteringByteChannel in, int length)
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throws IOException {
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return buffer.setBytes(index, in, length);
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}
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@Override
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public void writeByte(byte value) {
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ensureWritableBytes(1);
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super.writeByte(value);
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}
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@Override
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public void writeShort(short value) {
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ensureWritableBytes(2);
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super.writeShort(value);
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}
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@Override
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public void writeMedium(int value) {
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ensureWritableBytes(3);
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super.writeMedium(value);
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}
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@Override
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public void writeInt(int value) {
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ensureWritableBytes(4);
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super.writeInt(value);
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}
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@Override
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public void writeLong(long value) {
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ensureWritableBytes(8);
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super.writeLong(value);
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}
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@Override
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public void writeBytes(byte[] src, int srcIndex, int length) {
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ensureWritableBytes(length);
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super.writeBytes(src, srcIndex, length);
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}
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@Override
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public void writeBytes(ChannelBuffer src, int srcIndex, int length) {
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ensureWritableBytes(length);
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super.writeBytes(src, srcIndex, length);
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}
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@Override
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public void writeBytes(ByteBuffer src) {
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ensureWritableBytes(src.remaining());
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super.writeBytes(src);
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}
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@Override
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public void writeZero(int length) {
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ensureWritableBytes(length);
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super.writeZero(length);
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}
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public ChannelBuffer duplicate() {
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return new DuplicatedChannelBuffer(this);
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}
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public ChannelBuffer copy(int index, int length) {
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DynamicChannelBuffer copiedBuffer = new DynamicChannelBuffer(order(), Math.max(length, 64), factory());
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copiedBuffer.buffer = buffer.copy(index, length);
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copiedBuffer.setIndex(0, length);
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return copiedBuffer;
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}
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public ChannelBuffer slice(int index, int length) {
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if (index == 0) {
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if (length == 0) {
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return ChannelBuffers.EMPTY_BUFFER;
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}
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return new TruncatedChannelBuffer(this, length);
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} else {
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if (length == 0) {
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return ChannelBuffers.EMPTY_BUFFER;
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}
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return new SlicedChannelBuffer(this, index, length);
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}
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}
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public ByteBuffer toByteBuffer(int index, int length) {
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return buffer.toByteBuffer(index, length);
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}
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public String toString(int index, int length, String charsetName) {
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return buffer.toString(index, length, charsetName);
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}
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private void ensureWritableBytes(int requestedBytes) {
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if (requestedBytes <= writableBytes()) {
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return;
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}
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int newCapacity;
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if (capacity() == 0) {
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newCapacity = initialCapacity;
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if (newCapacity == 0) {
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newCapacity = 1;
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}
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} else {
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newCapacity = capacity();
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}
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int minNewCapacity = writerIndex() + requestedBytes;
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while (newCapacity < minNewCapacity) {
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newCapacity <<= 1;
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}
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ChannelBuffer newBuffer = factory().getBuffer(order(), newCapacity);
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newBuffer.writeBytes(buffer, readerIndex(), readableBytes());
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buffer = newBuffer;
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}
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}
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