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/*
* 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 static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
import io.netty.util.ByteProcessor;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.StringUtil;
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.nio.charset.Charset;
/**
* An empty {@link ByteBuf} whose capacity and maximum capacity are all {@code 0}.
*/
public final class EmptyByteBuf extends ByteBuf {
static final int EMPTY_BYTE_BUF_HASH_CODE = 1;
private static final ByteBuffer EMPTY_BYTE_BUFFER = ByteBuffer.allocateDirect(0);
private static final long EMPTY_BYTE_BUFFER_ADDRESS;
static {
long emptyByteBufferAddress = 0;
try {
if (PlatformDependent.hasUnsafe()) {
emptyByteBufferAddress = PlatformDependent.directBufferAddress(EMPTY_BYTE_BUFFER);
}
} catch (Throwable t) {
// Ignore
}
EMPTY_BYTE_BUFFER_ADDRESS = emptyByteBufferAddress;
}
private final ByteBufAllocator alloc;
private final ByteOrder order;
private final String str;
private EmptyByteBuf swapped;
public EmptyByteBuf(ByteBufAllocator alloc) {
this(alloc, ByteOrder.BIG_ENDIAN);
}
private EmptyByteBuf(ByteBufAllocator alloc, ByteOrder order) {
this.alloc = ObjectUtil.checkNotNull(alloc, "alloc");
this.order = order;
str = StringUtil.simpleClassName(this) + (order == ByteOrder.BIG_ENDIAN? "BE" : "LE");
}
@Override
public int capacity() {
return 0;
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBufAllocator alloc() {
return alloc;
}
@Override
public ByteOrder order() {
return order;
}
@Override
public ByteBuf unwrap() {
return null;
}
@Override
public ByteBuf asReadOnly() {
return Unpooled.unmodifiableBuffer(this);
}
@Override
public boolean isReadOnly() {
return false;
}
@Override
public boolean isDirect() {
return true;
}
@Override
public int maxCapacity() {
return 0;
}
@Override
public ByteBuf order(ByteOrder endianness) {
if (ObjectUtil.checkNotNull(endianness, "endianness") == order()) {
return this;
}
EmptyByteBuf swapped = this.swapped;
if (swapped != null) {
return swapped;
}
this.swapped = swapped = new EmptyByteBuf(alloc(), endianness);
return swapped;
}
@Override
public int readerIndex() {
return 0;
}
@Override
public ByteBuf readerIndex(int readerIndex) {
return checkIndex(readerIndex);
}
@Override
public int writerIndex() {
return 0;
}
@Override
public ByteBuf writerIndex(int writerIndex) {
return checkIndex(writerIndex);
}
@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
checkIndex(readerIndex);
checkIndex(writerIndex);
return this;
}
@Override
public int readableBytes() {
return 0;
}
@Override
public int writableBytes() {
return 0;
}
@Override
public int maxWritableBytes() {
return 0;
}
@Override
public boolean isReadable() {
return false;
}
@Override
public boolean isWritable() {
return false;
}
@Override
public ByteBuf clear() {
return this;
}
@Override
public ByteBuf markReaderIndex() {
return this;
}
@Override
public ByteBuf resetReaderIndex() {
return this;
}
@Override
public ByteBuf markWriterIndex() {
return this;
}
@Override
public ByteBuf resetWriterIndex() {
return this;
}
@Override
public ByteBuf discardReadBytes() {
return this;
}
@Override
public ByteBuf discardSomeReadBytes() {
return this;
}
@Override
public ByteBuf ensureWritable(int minWritableBytes) {
checkPositiveOrZero(minWritableBytes, "minWritableBytes");
if (minWritableBytes != 0) {
throw new IndexOutOfBoundsException();
}
return this;
}
@Override
public int ensureWritable(int minWritableBytes, boolean force) {
checkPositiveOrZero(minWritableBytes, "minWritableBytes");
if (minWritableBytes == 0) {
return 0;
}
return 1;
}
@Override
public boolean getBoolean(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public byte getByte(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public short getUnsignedByte(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public short getShort(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public short getShortLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getUnsignedShort(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getUnsignedShortLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getMedium(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getMediumLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getUnsignedMedium(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getUnsignedMediumLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getInt(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int getIntLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public long getUnsignedInt(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public long getUnsignedIntLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public long getLong(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public long getLongLE(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public char getChar(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public float getFloat(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public double getDouble(int index) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst) {
return checkIndex(index, dst.writableBytes());
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf getBytes(int index, byte[] dst) {
return checkIndex(index, dst.length);
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
return checkIndex(index, dst.remaining());
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) {
return checkIndex(index, length);
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) {
checkIndex(index, length);
return 0;
}
@Override
public int getBytes(int index, FileChannel out, long position, int length) {
checkIndex(index, length);
return 0;
}
@Override
public CharSequence getCharSequence(int index, int length, Charset charset) {
checkIndex(index, length);
return null;
}
@Override
public ByteBuf setBoolean(int index, boolean value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setByte(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setShort(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setShortLE(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setMedium(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setMediumLE(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setInt(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setIntLE(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setLong(int index, long value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setLongLE(int index, long value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setChar(int index, int value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setFloat(int index, float value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setDouble(int index, double value) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setBytes(int index, ByteBuf src) {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf setBytes(int index, byte[] src) {
return checkIndex(index, src.length);
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
return checkIndex(index, length);
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
return checkIndex(index, src.remaining());
}
@Override
public int setBytes(int index, InputStream in, int length) {
checkIndex(index, length);
return 0;
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) {
checkIndex(index, length);
return 0;
}
@Override
public int setBytes(int index, FileChannel in, long position, int length) {
checkIndex(index, length);
return 0;
}
@Override
public ByteBuf setZero(int index, int length) {
return checkIndex(index, length);
}
@Override
public int setCharSequence(int index, CharSequence sequence, Charset charset) {
throw new IndexOutOfBoundsException();
}
@Override
public boolean readBoolean() {
throw new IndexOutOfBoundsException();
}
@Override
public byte readByte() {
throw new IndexOutOfBoundsException();
}
@Override
public short readUnsignedByte() {
throw new IndexOutOfBoundsException();
}
@Override
public short readShort() {
throw new IndexOutOfBoundsException();
}
@Override
public short readShortLE() {
throw new IndexOutOfBoundsException();
}
@Override
public int readUnsignedShort() {
throw new IndexOutOfBoundsException();
}
@Override
public int readUnsignedShortLE() {
throw new IndexOutOfBoundsException();
}
@Override
public int readMedium() {
throw new IndexOutOfBoundsException();
}
@Override
public int readMediumLE() {
throw new IndexOutOfBoundsException();
}
@Override
public int readUnsignedMedium() {
throw new IndexOutOfBoundsException();
}
@Override
public int readUnsignedMediumLE() {
throw new IndexOutOfBoundsException();
}
@Override
public int readInt() {
throw new IndexOutOfBoundsException();
}
@Override
public int readIntLE() {
throw new IndexOutOfBoundsException();
}
@Override
public long readUnsignedInt() {
throw new IndexOutOfBoundsException();
}
@Override
public long readUnsignedIntLE() {
throw new IndexOutOfBoundsException();
}
@Override
public long readLong() {
throw new IndexOutOfBoundsException();
}
@Override
public long readLongLE() {
throw new IndexOutOfBoundsException();
}
@Override
public char readChar() {
throw new IndexOutOfBoundsException();
}
@Override
public float readFloat() {
throw new IndexOutOfBoundsException();
}
@Override
public double readDouble() {
throw new IndexOutOfBoundsException();
}
@Override
public ByteBuf readBytes(int length) {
return checkLength(length);
}
@Override
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 boolean isContiguous() {
return true;
}
@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;
}
}
