io.netty.buffer.FixedCompositeByteBuf 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).
The newest version!
/*
* 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:
*
* https://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.EmptyArrays;
import io.netty.util.internal.RecyclableArrayList;
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.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.util.Collections;
/**
* {@link ByteBuf} implementation which allows to wrap an array of {@link ByteBuf} in a read-only mode.
* This is useful to write an array of {@link ByteBuf}s.
*/
final class FixedCompositeByteBuf extends AbstractReferenceCountedByteBuf {
private static final ByteBuf[] EMPTY = { Unpooled.EMPTY_BUFFER };
private final int nioBufferCount;
private final int capacity;
private final ByteBufAllocator allocator;
private final ByteOrder order;
private final ByteBuf[] buffers;
private final boolean direct;
FixedCompositeByteBuf(ByteBufAllocator allocator, ByteBuf... buffers) {
super(AbstractByteBufAllocator.DEFAULT_MAX_CAPACITY);
if (buffers.length == 0) {
this.buffers = EMPTY;
order = ByteOrder.BIG_ENDIAN;
nioBufferCount = 1;
capacity = 0;
direct = Unpooled.EMPTY_BUFFER.isDirect();
} else {
ByteBuf b = buffers[0];
this.buffers = buffers;
boolean direct = true;
int nioBufferCount = b.nioBufferCount();
int capacity = b.readableBytes();
order = b.order();
for (int i = 1; i < buffers.length; i++) {
b = buffers[i];
if (buffers[i].order() != order) {
throw new IllegalArgumentException("All ByteBufs need to have same ByteOrder");
}
nioBufferCount += b.nioBufferCount();
capacity += b.readableBytes();
if (!b.isDirect()) {
direct = false;
}
}
this.nioBufferCount = nioBufferCount;
this.capacity = capacity;
this.direct = direct;
}
setIndex(0, capacity());
this.allocator = allocator;
}
@Override
public boolean isWritable() {
return false;
}
@Override
public boolean isWritable(int size) {
return false;
}
@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
protected void _setShortLE(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
protected void _setMediumLE(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
protected void _setIntLE(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
protected void _setLongLE(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 setBytes(int index, FileChannel in, long position, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int capacity() {
return capacity;
}
@Override
public int maxCapacity() {
return capacity;
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBufAllocator alloc() {
return allocator;
}
@Override
public ByteOrder order() {
return order;
}
@Override
public ByteBuf unwrap() {
return null;
}
@Override
public boolean isDirect() {
return direct;
}
private Component findComponent(int index) {
int readable = 0;
for (int i = 0 ; i < buffers.length; i++) {
Component comp = null;
ByteBuf b = buffers[i];
if (b instanceof Component) {
comp = (Component) b;
b = comp.buf;
}
readable += b.readableBytes();
if (index < readable) {
if (comp == null) {
// Create a new component and store it in the array so it not create a new object
// on the next access.
comp = new Component(i, readable - b.readableBytes(), b);
buffers[i] = comp;
}
return comp;
}
}
throw new IllegalStateException();
}
/**
* Return the {@link ByteBuf} stored at the given index of the array.
*/
private ByteBuf buffer(int i) {
ByteBuf b = buffers[i];
return b instanceof Component ? ((Component) b).buf : b;
}
@Override
public byte getByte(int index) {
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
Component c = findComponent(index);
return c.buf.getByte(index - c.offset);
}
@Override
protected short _getShort(int index) {
Component c = findComponent(index);
if (index + 2 <= c.endOffset) {
return c.buf.getShort(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (short) ((_getByte(index) & 0xff) << 8 | _getByte(index + 1) & 0xff);
} else {
return (short) (_getByte(index) & 0xff | (_getByte(index + 1) & 0xff) << 8);
}
}
@Override
protected short _getShortLE(int index) {
Component c = findComponent(index);
if (index + 2 <= c.endOffset) {
return c.buf.getShortLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (short) (_getByte(index) & 0xff | (_getByte(index + 1) & 0xff) << 8);
} else {
return (short) ((_getByte(index) & 0xff) << 8 | _getByte(index + 1) & 0xff);
}
}
@Override
protected int _getUnsignedMedium(int index) {
Component c = findComponent(index);
if (index + 3 <= c.endOffset) {
return c.buf.getUnsignedMedium(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getShort(index) & 0xffff) << 8 | _getByte(index + 2) & 0xff;
} else {
return _getShort(index) & 0xFFFF | (_getByte(index + 2) & 0xFF) << 16;
}
}
@Override
protected int _getUnsignedMediumLE(int index) {
Component c = findComponent(index);
if (index + 3 <= c.endOffset) {
return c.buf.getUnsignedMediumLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getShortLE(index) & 0xffff | (_getByte(index + 2) & 0xff) << 16;
} else {
return (_getShortLE(index) & 0xffff) << 8 | _getByte(index + 2) & 0xff;
}
}
@Override
protected int _getInt(int index) {
Component c = findComponent(index);
if (index + 4 <= c.endOffset) {
return c.buf.getInt(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getShort(index) & 0xffff) << 16 | _getShort(index + 2) & 0xffff;
} else {
return _getShort(index) & 0xFFFF | (_getShort(index + 2) & 0xFFFF) << 16;
}
}
@Override
protected int _getIntLE(int index) {
Component c = findComponent(index);
if (index + 4 <= c.endOffset) {
return c.buf.getIntLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getShortLE(index) & 0xFFFF | (_getShortLE(index + 2) & 0xFFFF) << 16;
} else {
return (_getShortLE(index) & 0xffff) << 16 | _getShortLE(index + 2) & 0xffff;
}
}
@Override
protected long _getLong(int index) {
Component c = findComponent(index);
if (index + 8 <= c.endOffset) {
return c.buf.getLong(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getInt(index) & 0xffffffffL) << 32 | _getInt(index + 4) & 0xffffffffL;
} else {
return _getInt(index) & 0xFFFFFFFFL | (_getInt(index + 4) & 0xFFFFFFFFL) << 32;
}
}
@Override
protected long _getLongLE(int index) {
Component c = findComponent(index);
if (index + 8 <= c.endOffset) {
return c.buf.getLongLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getIntLE(index) & 0xffffffffL | (_getIntLE(index + 4) & 0xffffffffL) << 32;
} else {
return (_getIntLE(index) & 0xffffffffL) << 32 | _getIntLE(index + 4) & 0xffffffffL;
}
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.length);
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, dst, dstIndex, localLength);
index += localLength;
dstIndex += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
int limit = dst.limit();
int length = dst.remaining();
checkIndex(index, length);
if (length == 0) {
return this;
}
try {
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
dst.limit(dst.position() + localLength);
s.getBytes(index - adjustment, dst);
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
} finally {
dst.limit(limit);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.capacity());
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, dst, dstIndex, localLength);
index += localLength;
dstIndex += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length)
throws IOException {
int count = nioBufferCount();
if (count == 1) {
return out.write(internalNioBuffer(index, length));
} else {
long writtenBytes = out.write(nioBuffers(index, length));
if (writtenBytes > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
} else {
return (int) writtenBytes;
}
}
}
@Override
public int getBytes(int index, FileChannel out, long position, int length)
throws IOException {
int count = nioBufferCount();
if (count == 1) {
return out.write(internalNioBuffer(index, length), position);
} else {
long writtenBytes = 0;
for (ByteBuffer buf : nioBuffers(index, length)) {
writtenBytes += out.write(buf, position + writtenBytes);
}
if (writtenBytes > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
} else {
return (int) writtenBytes;
}
}
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
checkIndex(index, length);
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, out, localLength);
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex(index, length);
boolean release = true;
ByteBuf buf = alloc().buffer(length);
try {
buf.writeBytes(this, index, length);
release = false;
return buf;
} finally {
if (release) {
buf.release();
}
}
}
@Override
public int nioBufferCount() {
return nioBufferCount;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex(index, length);
if (buffers.length == 1) {
ByteBuf buf = buffer(0);
if (buf.nioBufferCount() == 1) {
return buf.nioBuffer(index, length);
}
}
ByteBuffer merged = ByteBuffer.allocate(length).order(order());
ByteBuffer[] buffers = nioBuffers(index, length);
//noinspection ForLoopReplaceableByForEach
for (int i = 0; i < buffers.length; i++) {
merged.put(buffers[i]);
}
merged.flip();
return merged;
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
if (buffers.length == 1) {
return buffer(0).internalNioBuffer(index, length);
}
throw new UnsupportedOperationException();
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
checkIndex(index, length);
if (length == 0) {
return EmptyArrays.EMPTY_BYTE_BUFFERS;
}
RecyclableArrayList array = RecyclableArrayList.newInstance(buffers.length);
try {
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
switch (s.nioBufferCount()) {
case 0:
throw new UnsupportedOperationException();
case 1:
array.add(s.nioBuffer(index - adjustment, localLength));
break;
default:
Collections.addAll(array, s.nioBuffers(index - adjustment, localLength));
}
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return array.toArray(EmptyArrays.EMPTY_BYTE_BUFFERS);
} finally {
array.recycle();
}
}
@Override
public boolean hasArray() {
switch (buffers.length) {
case 0:
return true;
case 1:
return buffer(0).hasArray();
default:
return false;
}
}
@Override
public byte[] array() {
switch (buffers.length) {
case 0:
return EmptyArrays.EMPTY_BYTES;
case 1:
return buffer(0).array();
default:
throw new UnsupportedOperationException();
}
}
@Override
public int arrayOffset() {
switch (buffers.length) {
case 0:
return 0;
case 1:
return buffer(0).arrayOffset();
default:
throw new UnsupportedOperationException();
}
}
@Override
public boolean hasMemoryAddress() {
switch (buffers.length) {
case 0:
return Unpooled.EMPTY_BUFFER.hasMemoryAddress();
case 1:
return buffer(0).hasMemoryAddress();
default:
return false;
}
}
@Override
public long memoryAddress() {
switch (buffers.length) {
case 0:
return Unpooled.EMPTY_BUFFER.memoryAddress();
case 1:
return buffer(0).memoryAddress();
default:
throw new UnsupportedOperationException();
}
}
@Override
protected void deallocate() {
for (int i = 0; i < buffers.length; i++) {
buffer(i).release();
}
}
@Override
public String toString() {
String result = super.toString();
result = result.substring(0, result.length() - 1);
return result + ", components=" + buffers.length + ')';
}
private static final class Component extends WrappedByteBuf {
private final int index;
private final int offset;
private final int endOffset;
Component(int index, int offset, ByteBuf buf) {
super(buf);
this.index = index;
this.offset = offset;
endOffset = offset + buf.readableBytes();
}
}
}