io.netty.buffer.SlicedByteBuf Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
/**
* A derived buffer which exposes its parent's sub-region only. It is
* recommended to use {@link ByteBuf#slice()} and
* {@link ByteBuf#slice(int, int)} instead of calling the constructor
* explicitly.
*/
public class SlicedByteBuf extends AbstractDerivedByteBuf {
private final ByteBuf buffer;
private final int adjustment;
private final int length;
public SlicedByteBuf(ByteBuf buffer, int index, int length) {
super(length);
if (index < 0 || index > buffer.capacity() - length) {
throw new IndexOutOfBoundsException(buffer + ".slice(" + index + ", " + length + ')');
}
if (buffer instanceof SlicedByteBuf) {
this.buffer = ((SlicedByteBuf) buffer).buffer;
adjustment = ((SlicedByteBuf) buffer).adjustment + index;
} else if (buffer instanceof DuplicatedByteBuf) {
this.buffer = buffer.unwrap();
adjustment = index;
} else {
this.buffer = buffer;
adjustment = index;
}
this.length = length;
writerIndex(length);
}
@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 int capacity() {
return length;
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new UnsupportedOperationException("sliced buffer");
}
@Override
public boolean hasArray() {
return buffer.hasArray();
}
@Override
public byte[] array() {
return buffer.array();
}
@Override
public int arrayOffset() {
return idx(buffer.arrayOffset());
}
@Override
public boolean hasMemoryAddress() {
return buffer.hasMemoryAddress();
}
@Override
public long memoryAddress() {
return buffer.memoryAddress() + adjustment;
}
@Override
protected byte _getByte(int index) {
return buffer.getByte(idx(index));
}
@Override
protected short _getShort(int index) {
return buffer.getShort(idx(index));
}
@Override
protected int _getUnsignedMedium(int index) {
return buffer.getUnsignedMedium(idx(index));
}
@Override
protected int _getInt(int index) {
return buffer.getInt(idx(index));
}
@Override
protected long _getLong(int index) {
return buffer.getLong(idx(index));
}
@Override
public ByteBuf duplicate() {
ByteBuf duplicate = buffer.slice(adjustment, length);
duplicate.setIndex(readerIndex(), writerIndex());
return duplicate;
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex0(index, length);
return buffer.copy(idx(index), length);
}
@Override
public ByteBuf slice(int index, int length) {
checkIndex0(index, length);
return buffer.slice(idx(index), length);
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkIndex0(index, length);
buffer.getBytes(idx(index), dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkIndex0(index, length);
buffer.getBytes(idx(index), dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
checkIndex0(index, dst.remaining());
buffer.getBytes(idx(index), dst);
return this;
}
@Override
protected void _setByte(int index, int value) {
buffer.setByte(idx(index), value);
}
@Override
protected void _setShort(int index, int value) {
buffer.setShort(idx(index), value);
}
@Override
protected void _setMedium(int index, int value) {
buffer.setMedium(idx(index), value);
}
@Override
protected void _setInt(int index, int value) {
buffer.setInt(idx(index), value);
}
@Override
protected void _setLong(int index, long value) {
buffer.setLong(idx(index), value);
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
checkIndex0(index, length);
buffer.setBytes(idx(index), src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
checkIndex0(index, length);
buffer.setBytes(idx(index), src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
checkIndex0(index, src.remaining());
buffer.setBytes(idx(index), src);
return this;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
checkIndex0(index, length);
buffer.getBytes(idx(index), out, length);
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
checkIndex0(index, length);
return buffer.getBytes(idx(index), out, length);
}
@Override
public int setBytes(int index, InputStream in, int length) throws IOException {
checkIndex0(index, length);
return buffer.setBytes(idx(index), in, length);
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
checkIndex0(index, length);
return buffer.setBytes(idx(index), in, length);
}
@Override
public int nioBufferCount() {
return buffer.nioBufferCount();
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex0(index, length);
return buffer.nioBuffer(idx(index), length);
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
checkIndex0(index, length);
return buffer.nioBuffers(idx(index), length);
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
return nioBuffer(index, length);
}
@Override
public int forEachByte(int index, int length, ByteBufProcessor processor) {
checkIndex0(index, length);
int ret = buffer.forEachByte(idx(index), length, processor);
if (ret >= adjustment) {
return ret - adjustment;
} else {
return -1;
}
}
@Override
public int forEachByteDesc(int index, int length, ByteBufProcessor processor) {
checkIndex0(index, length);
int ret = buffer.forEachByteDesc(idx(index), length, processor);
if (ret >= adjustment) {
return ret - adjustment;
} else {
return -1;
}
}
/**
* Returns the index with the needed adjustment.
*/
final int idx(int index) {
return index + adjustment;
}
}
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