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/*
* Copyright 2012 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 io.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 Unpooled#unmodifiableBuffer(ByteBuf)}
* instead of calling the constructor explicitly.
*/
public class ReadOnlyByteBuf extends AbstractDerivedByteBuf {
private final ByteBuf buffer;
public ReadOnlyByteBuf(ByteBuf buffer) {
super(buffer.maxCapacity());
if (buffer instanceof ReadOnlyByteBuf || buffer instanceof DuplicatedByteBuf) {
this.buffer = buffer.unwrap();
} else {
this.buffer = buffer;
}
setIndex(buffer.readerIndex(), buffer.writerIndex());
}
@Override
public boolean isWritable() {
return false;
}
@Override
public boolean isWritable(int numBytes) {
return false;
}
@Override
public ByteBuf unwrap() {
return buffer;
}
@Override
public ByteBufAllocator alloc() {
return buffer.alloc();
}
@Override
public ByteOrder order() {
return buffer.order();
}
@Override
public boolean isDirect() {
return buffer.isDirect();
}
@Override
public boolean hasArray() {
return false;
}
@Override
public byte[] array() {
throw new ReadOnlyBufferException();
}
@Override
public int arrayOffset() {
throw new ReadOnlyBufferException();
}
@Override
public boolean hasMemoryAddress() {
return false;
}
@Override
public long memoryAddress() {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf discardReadBytes() {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setByte(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setByte(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setShort(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setShort(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setMedium(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setMedium(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setInt(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setInt(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setLong(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setLong(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, InputStream in, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length)
throws IOException {
return buffer.getBytes(index, out, length);
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length)
throws IOException {
buffer.getBytes(index, out, length);
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
buffer.getBytes(index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
buffer.getBytes(index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
buffer.getBytes(index, dst);
return this;
}
@Override
public ByteBuf duplicate() {
return new ReadOnlyByteBuf(this);
}
@Override
public ByteBuf copy(int index, int length) {
return buffer.copy(index, length);
}
@Override
public ByteBuf slice(int index, int length) {
return Unpooled.unmodifiableBuffer(buffer.slice(index, length));
}
@Override
public byte getByte(int index) {
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
return buffer.getByte(index);
}
@Override
public short getShort(int index) {
return _getShort(index);
}
@Override
protected short _getShort(int index) {
return buffer.getShort(index);
}
@Override
public int getUnsignedMedium(int index) {
return _getUnsignedMedium(index);
}
@Override
protected int _getUnsignedMedium(int index) {
return buffer.getUnsignedMedium(index);
}
@Override
public int getInt(int index) {
return _getInt(index);
}
@Override
protected int _getInt(int index) {
return buffer.getInt(index);
}
@Override
public long getLong(int index) {
return _getLong(index);
}
@Override
protected long _getLong(int index) {
return buffer.getLong(index);
}
@Override
public int nioBufferCount() {
return buffer.nioBufferCount();
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
return buffer.nioBuffer(index, length).asReadOnlyBuffer();
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
return buffer.nioBuffers(index, length);
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
return nioBuffer(index, length);
}
@Override
public int forEachByte(int index, int length, ByteBufProcessor processor) {
return buffer.forEachByte(index, length, processor);
}
@Override
public int forEachByteDesc(int index, int length, ByteBufProcessor processor) {
return buffer.forEachByteDesc(index, length, processor);
}
@Override
public int capacity() {
return buffer.capacity();
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new ReadOnlyBufferException();
}
}
