1064 lines
23 KiB
Java
1064 lines
23 KiB
Java
/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
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import io.netty.util.ByteProcessor;
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import io.netty.util.internal.EmptyArrays;
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import io.netty.util.internal.PlatformDependent;
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import io.netty.util.internal.StringUtil;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.ReadOnlyBufferException;
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import java.nio.channels.FileChannel;
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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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import java.nio.charset.Charset;
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/**
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* An empty {@link ByteBuf} whose capacity and maximum capacity are all {@code 0}.
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*/
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public final class EmptyByteBuf extends ByteBuf {
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static final int EMPTY_BYTE_BUF_HASH_CODE = 1;
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private static final ByteBuffer EMPTY_BYTE_BUFFER = ByteBuffer.allocateDirect(0);
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private static final long EMPTY_BYTE_BUFFER_ADDRESS;
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static {
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long emptyByteBufferAddress = 0;
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try {
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if (PlatformDependent.hasUnsafe()) {
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emptyByteBufferAddress = PlatformDependent.directBufferAddress(EMPTY_BYTE_BUFFER);
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}
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} catch (Throwable t) {
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// Ignore
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}
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EMPTY_BYTE_BUFFER_ADDRESS = emptyByteBufferAddress;
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}
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private final ByteBufAllocator alloc;
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private final ByteOrder order;
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private final String str;
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private EmptyByteBuf swapped;
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public EmptyByteBuf(ByteBufAllocator alloc) {
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this(alloc, ByteOrder.BIG_ENDIAN);
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}
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private EmptyByteBuf(ByteBufAllocator alloc, ByteOrder order) {
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if (alloc == null) {
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throw new NullPointerException("alloc");
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}
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this.alloc = alloc;
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this.order = order;
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str = StringUtil.simpleClassName(this) + (order == ByteOrder.BIG_ENDIAN? "BE" : "LE");
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}
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@Override
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public int capacity() {
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return 0;
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}
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@Override
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public ByteBuf capacity(int newCapacity) {
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throw new ReadOnlyBufferException();
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}
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@Override
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public ByteBufAllocator alloc() {
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return alloc;
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}
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@Override
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public ByteOrder order() {
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return order;
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}
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@Override
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public ByteBuf unwrap() {
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return null;
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}
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@Override
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public ByteBuf asReadOnly() {
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return Unpooled.unmodifiableBuffer(this);
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}
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@Override
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public boolean isReadOnly() {
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return false;
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}
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@Override
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public boolean isDirect() {
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return true;
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}
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@Override
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public int maxCapacity() {
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return 0;
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}
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@Override
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public ByteBuf order(ByteOrder endianness) {
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if (endianness == null) {
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throw new NullPointerException("endianness");
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}
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if (endianness == order()) {
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return this;
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}
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EmptyByteBuf swapped = this.swapped;
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if (swapped != null) {
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return swapped;
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}
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this.swapped = swapped = new EmptyByteBuf(alloc(), endianness);
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return swapped;
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}
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@Override
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public int readerIndex() {
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return 0;
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}
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@Override
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public ByteBuf readerIndex(int readerIndex) {
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return checkIndex(readerIndex);
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}
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@Override
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public int writerIndex() {
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return 0;
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}
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@Override
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public ByteBuf writerIndex(int writerIndex) {
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return checkIndex(writerIndex);
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}
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@Override
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public ByteBuf setIndex(int readerIndex, int writerIndex) {
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checkIndex(readerIndex);
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checkIndex(writerIndex);
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return this;
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}
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@Override
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public int readableBytes() {
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return 0;
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}
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@Override
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public int writableBytes() {
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return 0;
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}
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@Override
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public int maxWritableBytes() {
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return 0;
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}
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@Override
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public boolean isReadable() {
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return false;
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}
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@Override
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public boolean isWritable() {
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return false;
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}
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@Override
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public ByteBuf clear() {
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return this;
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}
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@Override
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public ByteBuf markReaderIndex() {
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return this;
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}
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@Override
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public ByteBuf resetReaderIndex() {
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return this;
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}
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@Override
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public ByteBuf markWriterIndex() {
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return this;
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}
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@Override
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public ByteBuf resetWriterIndex() {
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return this;
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}
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@Override
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public ByteBuf discardReadBytes() {
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return this;
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}
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@Override
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public ByteBuf discardSomeReadBytes() {
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return this;
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}
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@Override
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public ByteBuf ensureWritable(int minWritableBytes) {
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checkPositiveOrZero(minWritableBytes, "minWritableBytes");
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if (minWritableBytes != 0) {
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throw new IndexOutOfBoundsException();
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}
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return this;
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}
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@Override
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public int ensureWritable(int minWritableBytes, boolean force) {
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checkPositiveOrZero(minWritableBytes, "minWritableBytes");
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if (minWritableBytes == 0) {
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return 0;
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}
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return 1;
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}
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@Override
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public boolean getBoolean(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public byte getByte(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short getUnsignedByte(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short getShort(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short getShortLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getUnsignedShort(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getUnsignedShortLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getMedium(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getMediumLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getUnsignedMedium(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getUnsignedMediumLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getInt(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int getIntLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public long getUnsignedInt(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public long getUnsignedIntLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public long getLong(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public long getLongLE(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public char getChar(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public float getFloat(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public double getDouble(int index) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuf dst) {
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return checkIndex(index, dst.writableBytes());
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuf dst, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf getBytes(int index, byte[] dst) {
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return checkIndex(index, dst.length);
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}
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@Override
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public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuffer dst) {
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return checkIndex(index, dst.remaining());
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}
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@Override
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public ByteBuf getBytes(int index, OutputStream out, int length) {
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return checkIndex(index, length);
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}
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@Override
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public int getBytes(int index, GatheringByteChannel out, int length) {
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checkIndex(index, length);
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return 0;
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}
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@Override
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public int getBytes(int index, FileChannel out, long position, int length) {
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checkIndex(index, length);
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return 0;
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}
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@Override
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public CharSequence getCharSequence(int index, int length, Charset charset) {
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checkIndex(index, length);
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return null;
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}
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@Override
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public ByteBuf setBoolean(int index, boolean value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setByte(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setShort(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setShortLE(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setMedium(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setMediumLE(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setInt(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setIntLE(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setLong(int index, long value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setLongLE(int index, long value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setChar(int index, int value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setFloat(int index, float value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setDouble(int index, double value) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuf src) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuf src, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf setBytes(int index, byte[] src) {
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return checkIndex(index, src.length);
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}
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@Override
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public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
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return checkIndex(index, length);
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuffer src) {
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return checkIndex(index, src.remaining());
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}
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@Override
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public int setBytes(int index, InputStream in, int length) {
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checkIndex(index, length);
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return 0;
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}
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@Override
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public int setBytes(int index, ScatteringByteChannel in, int length) {
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checkIndex(index, length);
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return 0;
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}
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@Override
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public int setBytes(int index, FileChannel in, long position, int length) {
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checkIndex(index, length);
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return 0;
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}
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@Override
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public ByteBuf setZero(int index, int length) {
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return checkIndex(index, length);
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}
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@Override
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public int setCharSequence(int index, CharSequence sequence, Charset charset) {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public boolean readBoolean() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public byte readByte() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short readUnsignedByte() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short readShort() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public short readShortLE() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int readUnsignedShort() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int readUnsignedShortLE() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int readMedium() {
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throw new IndexOutOfBoundsException();
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}
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@Override
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public int readMediumLE() {
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throw new IndexOutOfBoundsException();
|
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}
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@Override
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|
public int readUnsignedMedium() {
|
|
throw new IndexOutOfBoundsException();
|
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}
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@Override
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public int readUnsignedMediumLE() {
|
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throw new IndexOutOfBoundsException();
|
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}
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@Override
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public int readInt() {
|
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throw new IndexOutOfBoundsException();
|
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}
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@Override
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public int readIntLE() {
|
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throw new IndexOutOfBoundsException();
|
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}
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@Override
|
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public long readUnsignedInt() {
|
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throw new IndexOutOfBoundsException();
|
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}
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@Override
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public long readUnsignedIntLE() {
|
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throw new IndexOutOfBoundsException();
|
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}
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@Override
|
|
public long readLong() {
|
|
throw new IndexOutOfBoundsException();
|
|
}
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@Override
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|
public long readLongLE() {
|
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throw new IndexOutOfBoundsException();
|
|
}
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|
@Override
|
|
public char readChar() {
|
|
throw new IndexOutOfBoundsException();
|
|
}
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|
|
@Override
|
|
public float readFloat() {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public double readDouble() {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
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|
|
@Override
|
|
public ByteBuf readBytes(int length) {
|
|
return checkLength(length);
|
|
}
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|
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@Override
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|
public ByteBuf readSlice(int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readRetainedSlice(int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(ByteBuf dst) {
|
|
return checkLength(dst.writableBytes());
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(ByteBuf dst, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(ByteBuf dst, int dstIndex, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(byte[] dst) {
|
|
return checkLength(dst.length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(byte[] dst, int dstIndex, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(ByteBuffer dst) {
|
|
return checkLength(dst.remaining());
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf readBytes(OutputStream out, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public int readBytes(GatheringByteChannel out, int length) {
|
|
checkLength(length);
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public int readBytes(FileChannel out, long position, int length) {
|
|
checkLength(length);
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public CharSequence readCharSequence(int length, Charset charset) {
|
|
checkLength(length);
|
|
return StringUtil.EMPTY_STRING;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf skipBytes(int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBoolean(boolean value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeByte(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeShort(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeShortLE(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeMedium(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeMediumLE(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeInt(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeIntLE(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeLong(long value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeLongLE(long value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeChar(int value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeFloat(float value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeDouble(double value) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(ByteBuf src) {
|
|
return checkLength(src.readableBytes());
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(ByteBuf src, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(ByteBuf src, int srcIndex, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(byte[] src) {
|
|
return checkLength(src.length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(byte[] src, int srcIndex, int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeBytes(ByteBuffer src) {
|
|
return checkLength(src.remaining());
|
|
}
|
|
|
|
@Override
|
|
public int writeBytes(InputStream in, int length) {
|
|
checkLength(length);
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public int writeBytes(ScatteringByteChannel in, int length) {
|
|
checkLength(length);
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public int writeBytes(FileChannel in, long position, int length) {
|
|
checkLength(length);
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf writeZero(int length) {
|
|
return checkLength(length);
|
|
}
|
|
|
|
@Override
|
|
public int writeCharSequence(CharSequence sequence, Charset charset) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
|
|
@Override
|
|
public int indexOf(int fromIndex, int toIndex, byte value) {
|
|
checkIndex(fromIndex);
|
|
checkIndex(toIndex);
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int bytesBefore(byte value) {
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int bytesBefore(int length, byte value) {
|
|
checkLength(length);
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int bytesBefore(int index, int length, byte value) {
|
|
checkIndex(index, length);
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int forEachByte(ByteProcessor processor) {
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int forEachByte(int index, int length, ByteProcessor processor) {
|
|
checkIndex(index, length);
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int forEachByteDesc(ByteProcessor processor) {
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public int forEachByteDesc(int index, int length, ByteProcessor processor) {
|
|
checkIndex(index, length);
|
|
return -1;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf copy() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf copy(int index, int length) {
|
|
return checkIndex(index, length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf slice() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf retainedSlice() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf slice(int index, int length) {
|
|
return checkIndex(index, length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf retainedSlice(int index, int length) {
|
|
return checkIndex(index, length);
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf duplicate() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf retainedDuplicate() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public int nioBufferCount() {
|
|
return 1;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuffer nioBuffer() {
|
|
return EMPTY_BYTE_BUFFER;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuffer nioBuffer(int index, int length) {
|
|
checkIndex(index, length);
|
|
return nioBuffer();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuffer[] nioBuffers() {
|
|
return new ByteBuffer[] { EMPTY_BYTE_BUFFER };
|
|
}
|
|
|
|
@Override
|
|
public ByteBuffer[] nioBuffers(int index, int length) {
|
|
checkIndex(index, length);
|
|
return nioBuffers();
|
|
}
|
|
|
|
@Override
|
|
public ByteBuffer internalNioBuffer(int index, int length) {
|
|
return EMPTY_BYTE_BUFFER;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasArray() {
|
|
return true;
|
|
}
|
|
|
|
@Override
|
|
public byte[] array() {
|
|
return EmptyArrays.EMPTY_BYTES;
|
|
}
|
|
|
|
@Override
|
|
public int arrayOffset() {
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasMemoryAddress() {
|
|
return EMPTY_BYTE_BUFFER_ADDRESS != 0;
|
|
}
|
|
|
|
@Override
|
|
public long memoryAddress() {
|
|
if (hasMemoryAddress()) {
|
|
return EMPTY_BYTE_BUFFER_ADDRESS;
|
|
} else {
|
|
throw new UnsupportedOperationException();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public String toString(Charset charset) {
|
|
return "";
|
|
}
|
|
|
|
@Override
|
|
public String toString(int index, int length, Charset charset) {
|
|
checkIndex(index, length);
|
|
return toString(charset);
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return EMPTY_BYTE_BUF_HASH_CODE;
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object obj) {
|
|
return obj instanceof ByteBuf && !((ByteBuf) obj).isReadable();
|
|
}
|
|
|
|
@Override
|
|
public int compareTo(ByteBuf buffer) {
|
|
return buffer.isReadable()? -1 : 0;
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return str;
|
|
}
|
|
|
|
@Override
|
|
public boolean isReadable(int size) {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean isWritable(int size) {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public int refCnt() {
|
|
return 1;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf retain() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf retain(int increment) {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf touch() {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf touch(Object hint) {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public boolean release() {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean release(int decrement) {
|
|
return false;
|
|
}
|
|
|
|
private ByteBuf checkIndex(int index) {
|
|
if (index != 0) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
return this;
|
|
}
|
|
|
|
private ByteBuf checkIndex(int index, int length) {
|
|
checkPositiveOrZero(length, "length");
|
|
if (index != 0 || length != 0) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
return this;
|
|
}
|
|
|
|
private ByteBuf checkLength(int length) {
|
|
checkPositiveOrZero(length, "length");
|
|
if (length != 0) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
return this;
|
|
}
|
|
}
|