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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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.ReadOnlyBufferException;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;

/**
 * A derived buffer which forbids any write requests to its parent.  It is
 * recommended to use {@link ChannelBuffers#unmodifiableBuffer(ChannelBuffer)}
 * instead of calling the constructor explicitly.
 *
 * @author The Netty Project
 * @author Trustin Lee
 *
 * @version $Rev: 2206 $, $Date: 2010-03-03 14:35:01 +0900 (Wed, 03 Mar 2010) $
 *
 */
public class ReadOnlyChannelBuffer extends AbstractChannelBuffer implements WrappedChannelBuffer {

    private final ChannelBuffer buffer;

    public ReadOnlyChannelBuffer(ChannelBuffer buffer) {
        if (buffer == null) {
            throw new NullPointerException("buffer");
        }
        this.buffer = buffer;
        setIndex(buffer.readerIndex(), buffer.writerIndex());
    }

    private ReadOnlyChannelBuffer(ReadOnlyChannelBuffer buffer) {
        this.buffer = buffer.buffer;
        setIndex(buffer.readerIndex(), buffer.writerIndex());
    }

    public ChannelBuffer unwrap() {
        return buffer;
    }

    public ChannelBufferFactory factory() {
        return buffer.factory();
    }

    public ByteOrder order() {
        return buffer.order();
    }

    public boolean isDirect() {
        return buffer.isDirect();
    }

    public boolean hasArray() {
        return false;
    }

    public byte[] array() {
        throw new ReadOnlyBufferException();
    }

    public int arrayOffset() {
        throw new ReadOnlyBufferException();
    }

    @Override
    public void discardReadBytes() {
        throw new ReadOnlyBufferException();
    }

    public void setByte(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
        throw new ReadOnlyBufferException();
    }

    public void setBytes(int index, byte[] src, int srcIndex, int length) {
        throw new ReadOnlyBufferException();
    }

    public void setBytes(int index, ByteBuffer src) {
        throw new ReadOnlyBufferException();
    }

    public void setShort(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    public void setMedium(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    public void setInt(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    public void setLong(int index, long value) {
        throw new ReadOnlyBufferException();
    }

    public int setBytes(int index, InputStream in, int length)
            throws IOException {
        throw new ReadOnlyBufferException();
    }

    public int setBytes(int index, ScatteringByteChannel in, int length)
            throws IOException {
        throw new ReadOnlyBufferException();
    }

    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 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 ChannelBuffer duplicate() {
        return new ReadOnlyChannelBuffer(this);
    }

    public ChannelBuffer copy(int index, int length) {
        return buffer.copy(index, length);
    }

    public ChannelBuffer slice(int index, int length) {
        return new ReadOnlyChannelBuffer(buffer.slice(index, length));
    }

    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 ByteBuffer toByteBuffer(int index, int length) {
        return buffer.toByteBuffer(index, length).asReadOnlyBuffer();
    }

    @Override
    public ByteBuffer[] toByteBuffers(int index, int length) {
        ByteBuffer[] bufs = buffer.toByteBuffers(index, length);
        for (int i = 0; i < bufs.length; i ++) {
            bufs[i] = bufs[i].asReadOnlyBuffer();
        }
        return bufs;
    }

    public int capacity() {
        return buffer.capacity();
    }
}