io.netty.buffer.ReadOnlyByteBufferBuf Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS 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 2013 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 io.netty.util.internal.StringUtil;
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;
/**
* Read-only ByteBuf which wraps a read-only ByteBuffer.
*/
class ReadOnlyByteBufferBuf extends AbstractReferenceCountedByteBuf {
protected final ByteBuffer buffer;
private final ByteBufAllocator allocator;
private ByteBuffer tmpNioBuf;
ReadOnlyByteBufferBuf(ByteBufAllocator allocator, ByteBuffer buffer) {
super(buffer.remaining());
if (!buffer.isReadOnly()) {
throw new IllegalArgumentException("must be a readonly buffer: " + StringUtil.simpleClassName(buffer));
}
this.allocator = allocator;
this.buffer = buffer.slice().order(ByteOrder.BIG_ENDIAN);
writerIndex(this.buffer.limit());
}
@Override
protected void deallocate() { }
@Override
public byte getByte(int index) {
ensureAccessible();
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
return buffer.get(index);
}
@Override
public short getShort(int index) {
ensureAccessible();
return _getShort(index);
}
@Override
protected short _getShort(int index) {
return buffer.getShort(index);
}
@Override
public int getUnsignedMedium(int index) {
ensureAccessible();
return _getUnsignedMedium(index);
}
@Override
protected int _getUnsignedMedium(int index) {
return (getByte(index) & 0xff) << 16 | (getByte(index + 1) & 0xff) << 8 | getByte(index + 2) & 0xff;
}
@Override
public int getInt(int index) {
ensureAccessible();
return _getInt(index);
}
@Override
protected int _getInt(int index) {
return buffer.getInt(index);
}
@Override
public long getLong(int index) {
ensureAccessible();
return _getLong(index);
}
@Override
protected long _getLong(int index) {
return buffer.getLong(index);
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.capacity());
if (dst.hasArray()) {
getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
} else if (dst.nioBufferCount() > 0) {
for (ByteBuffer bb: dst.nioBuffers(dstIndex, length)) {
int bbLen = bb.remaining();
getBytes(index, bb);
index += bbLen;
}
} else {
dst.setBytes(dstIndex, this, index, length);
}
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.length);
if (dstIndex < 0 || dstIndex > dst.length - length) {
throw new IndexOutOfBoundsException(String.format(
"dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dst.length));
}
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + length);
tmpBuf.get(dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
checkIndex(index);
if (dst == null) {
throw new NullPointerException("dst");
}
int bytesToCopy = Math.min(capacity() - index, dst.remaining());
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + bytesToCopy);
dst.put(tmpBuf);
return this;
}
@Override
protected void _setByte(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setShort(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setMedium(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setInt(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setLong(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
public int capacity() {
return maxCapacity();
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBufAllocator alloc() {
return allocator;
}
@Override
public ByteOrder order() {
return ByteOrder.BIG_ENDIAN;
}
@Override
public ByteBuf unwrap() {
return null;
}
@Override
public boolean isDirect() {
return buffer.isDirect();
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
ensureAccessible();
if (length == 0) {
return this;
}
if (buffer.hasArray()) {
out.write(buffer.array(), index + buffer.arrayOffset(), length);
} else {
byte[] tmp = new byte[length];
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index);
tmpBuf.get(tmp);
out.write(tmp);
}
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
ensureAccessible();
if (length == 0) {
return 0;
}
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + length);
return out.write(tmpBuf);
}
@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 int setBytes(int index, InputStream in, int length) throws IOException {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
throw new ReadOnlyBufferException();
}
protected final ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.tmpNioBuf;
if (tmpNioBuf == null) {
this.tmpNioBuf = tmpNioBuf = buffer.duplicate();
}
return tmpNioBuf;
}
@Override
public ByteBuf copy(int index, int length) {
ensureAccessible();
ByteBuffer src;
try {
src = (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
} catch (IllegalArgumentException ignored) {
throw new IndexOutOfBoundsException("Too many bytes to read - Need " + (index + length));
}
ByteBuffer dst = ByteBuffer.allocateDirect(length);
dst.put(src);
dst.order(order());
dst.clear();
return new UnpooledDirectByteBuf(alloc(), dst, maxCapacity());
}
@Override
public int nioBufferCount() {
return 1;
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
return new ByteBuffer[] { nioBuffer(index, length) };
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
return (ByteBuffer) buffer.duplicate().position(index).limit(index + length);
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
ensureAccessible();
return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
}
@Override
public boolean hasArray() {
return buffer.hasArray();
}
@Override
public byte[] array() {
return buffer.array();
}
@Override
public int arrayOffset() {
return buffer.arrayOffset();
}
@Override
public boolean hasMemoryAddress() {
return false;
}
@Override
public long memoryAddress() {
throw new UnsupportedOperationException();
}
}