2008-08-08 02:37:18 +02:00
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/*
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2009-08-28 09:15:49 +02:00
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* Copyright 2009 Red Hat, Inc.
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2008-08-08 02:37:18 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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2008-08-08 02:37:18 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2008-08-08 03:27:24 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2008-08-08 02:37:18 +02:00
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*/
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2008-08-08 03:40:10 +02:00
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package org.jboss.netty.buffer;
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2008-08-08 02:37:18 +02:00
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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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2008-08-08 12:17:26 +02:00
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import java.io.UnsupportedEncodingException;
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2008-08-08 02:37:18 +02:00
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import java.nio.ByteBuffer;
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2008-11-16 14:52:47 +01:00
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import java.nio.channels.ClosedChannelException;
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2008-08-08 02:37:18 +02:00
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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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2008-08-08 12:17:26 +02:00
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import java.nio.charset.UnsupportedCharsetException;
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2008-08-08 02:37:18 +02:00
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/**
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2008-09-02 09:13:20 +02:00
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* A skeletal implementation for Java heap buffers.
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2008-08-08 02:37:18 +02:00
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*
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2008-08-08 03:27:24 +02:00
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* @author The Netty Project (netty-dev@lists.jboss.org)
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2009-10-14 07:46:40 +02:00
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* @author Trustin Lee (trustin@gmail.com)
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2008-08-08 02:37:18 +02:00
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*
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* @version $Rev$, $Date$
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*/
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public abstract class HeapChannelBuffer extends AbstractChannelBuffer {
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2008-09-02 09:13:20 +02:00
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/**
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* The underlying heap byte array that this buffer is wrapping.
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*/
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2008-08-08 02:37:18 +02:00
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protected final byte[] array;
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2008-09-02 09:13:20 +02:00
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/**
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* Creates a new heap buffer with a newly allocated byte array.
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*
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* @param length the length of the new byte array
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*/
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2008-08-08 02:37:18 +02:00
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public HeapChannelBuffer(int length) {
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this(new byte[length], 0, 0);
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}
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2008-09-02 09:13:20 +02:00
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/**
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* Creates a new heap buffer with an existing byte array.
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*
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* @param array the byte array to wrap
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*/
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2008-08-08 02:37:18 +02:00
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public HeapChannelBuffer(byte[] array) {
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this(array, 0, array.length);
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}
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2008-09-02 09:13:20 +02:00
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/**
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* Creates a new heap buffer with an existing byte array.
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*
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* @param array the byte array to wrap
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* @param readerIndex the initial reader index of this buffer
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* @param writerIndex the initial writer index of this buffer
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*/
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2008-08-08 02:37:18 +02:00
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protected HeapChannelBuffer(byte[] array, int readerIndex, int writerIndex) {
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if (array == null) {
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throw new NullPointerException("array");
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}
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this.array = array;
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setIndex(readerIndex, writerIndex);
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}
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public int capacity() {
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return array.length;
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}
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public byte getByte(int index) {
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return array[index];
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}
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public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
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if (dst instanceof HeapChannelBuffer) {
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getBytes(index, ((HeapChannelBuffer) dst).array, dstIndex, length);
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} else {
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dst.setBytes(dstIndex, array, index, length);
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}
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}
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public void getBytes(int index, byte[] dst, int dstIndex, int length) {
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System.arraycopy(array, index, dst, dstIndex, length);
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}
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public void getBytes(int index, ByteBuffer dst) {
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dst.put(array, index, Math.min(capacity() - index, dst.remaining()));
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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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out.write(array, index, length);
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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 out.write(ByteBuffer.wrap(array, index, length));
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}
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public void setByte(int index, byte value) {
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array[index] = value;
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}
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public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
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if (src instanceof HeapChannelBuffer) {
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setBytes(index, ((HeapChannelBuffer) src).array, srcIndex, length);
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} else {
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src.getBytes(srcIndex, array, index, length);
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}
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}
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public void setBytes(int index, byte[] src, int srcIndex, int length) {
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System.arraycopy(src, srcIndex, array, index, length);
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}
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public void setBytes(int index, ByteBuffer src) {
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src.get(array, index, src.remaining());
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}
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2008-08-20 05:09:23 +02:00
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public int setBytes(int index, InputStream in, int length) throws IOException {
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int readBytes = 0;
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2008-08-26 09:12:04 +02:00
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do {
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2008-08-20 05:09:23 +02:00
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int localReadBytes = in.read(array, index, length);
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if (localReadBytes < 0) {
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if (readBytes == 0) {
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return -1;
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} else {
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break;
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}
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2008-08-08 02:37:18 +02:00
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}
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2008-08-20 05:09:23 +02:00
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readBytes += localReadBytes;
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index += localReadBytes;
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length -= localReadBytes;
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2008-08-26 09:12:04 +02:00
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} while (length > 0);
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2008-08-20 05:09:23 +02:00
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return readBytes;
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2008-08-08 02:37:18 +02:00
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}
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public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
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ByteBuffer buf = ByteBuffer.wrap(array, index, length);
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2008-08-20 05:09:23 +02:00
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int readBytes = 0;
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2008-08-26 09:12:04 +02:00
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do {
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2008-11-16 14:52:47 +01:00
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int localReadBytes;
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try {
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localReadBytes = in.read(buf);
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} catch (ClosedChannelException e) {
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localReadBytes = -1;
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}
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2008-08-20 05:09:23 +02:00
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if (localReadBytes < 0) {
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if (readBytes == 0) {
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return -1;
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} else {
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break;
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}
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} else if (localReadBytes == 0) {
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2008-08-08 02:37:18 +02:00
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break;
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}
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2008-08-20 05:09:23 +02:00
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readBytes += localReadBytes;
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2008-08-26 09:12:04 +02:00
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} while (readBytes < length);
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2008-08-08 02:37:18 +02:00
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2008-08-20 05:09:23 +02:00
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return readBytes;
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2008-08-08 02:37:18 +02:00
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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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2008-08-26 17:37:08 +02:00
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if (length == 0) {
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return ChannelBuffers.EMPTY_BUFFER;
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}
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2008-08-08 02:37:18 +02:00
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if (length == array.length) {
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return duplicate();
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} else {
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return new TruncatedChannelBuffer(this, length);
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}
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} else {
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2008-08-26 17:37:08 +02:00
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if (length == 0) {
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return ChannelBuffers.EMPTY_BUFFER;
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}
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2008-08-08 02:37:18 +02:00
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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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2009-06-17 10:08:11 +02:00
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return ByteBuffer.wrap(array, index, length).order(order());
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2008-08-08 02:37:18 +02:00
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}
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2008-08-08 12:17:26 +02:00
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public String toString(int index, int length, String charsetName) {
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try {
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return new String(array, index, length, charsetName);
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} catch (UnsupportedEncodingException e) {
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throw new UnsupportedCharsetException(charsetName);
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}
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}
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2008-08-08 02:37:18 +02:00
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}
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