io.netty.buffer.EmptyByteBuf 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).
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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:
 *
 *   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.EmptyArrays;
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.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 {

    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) {
        if (alloc == null) {
            throw new NullPointerException("alloc");
        }

        this.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 boolean isDirect() {
        return true;
    }

    @Override
    public int maxCapacity() {
        return 0;
    }

    @Override
    public ByteBuf order(ByteOrder endianness) {
        if (endianness == null) {
            throw new NullPointerException("endianness");
        }
        if (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) {
        if (minWritableBytes < 0) {
            throw new IllegalArgumentException("minWritableBytes: " + minWritableBytes + " (expected: >= 0)");
        }
        if (minWritableBytes != 0) {
            throw new IndexOutOfBoundsException();
        }
        return this;
    }

    @Override
    public int ensureWritable(int minWritableBytes, boolean force) {
        if (minWritableBytes < 0) {
            throw new IllegalArgumentException("minWritableBytes: " + minWritableBytes + " (expected: >= 0)");
        }

        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 int getUnsignedShort(int index) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int getMedium(int index) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int getUnsignedMedium(int index) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int getInt(int index) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public long getUnsignedInt(int index) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public long getLong(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 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 setMedium(int index, int value) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public ByteBuf setInt(int index, int value) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public ByteBuf setLong(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 ByteBuf setZero(int index, int length) {
        return checkIndex(index, length);
    }

    @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 int readUnsignedShort() {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int readMedium() {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int readUnsignedMedium() {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int readInt() {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public long readUnsignedInt() {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public long readLong() {
        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 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 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 writeMedium(int value) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public ByteBuf writeInt(int value) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    public ByteBuf writeLong(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) {
        throw new IndexOutOfBoundsException();
    }

    @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 ByteBuf writeZero(int length) {
        return checkLength(length);
    }

    @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(ByteBufProcessor processor) {
        return -1;
    }

    @Override
    public int forEachByte(int index, int length, ByteBufProcessor processor) {
        checkIndex(index, length);
        return -1;
    }

    @Override
    public int forEachByteDesc(ByteBufProcessor processor) {
        return -1;
    }

    @Override
    public int forEachByteDesc(int index, int length, ByteBufProcessor 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 slice(int index, int length) {
        return checkIndex(index, length);
    }

    @Override
    public ByteBuf duplicate() {
        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 0;
    }

    @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 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) {
        if (length < 0) {
            throw new IllegalArgumentException("length: " + length);
        }
        if (index != 0 || length != 0) {
            throw new IndexOutOfBoundsException();
        }
        return this;
    }

    private ByteBuf checkLength(int length) {
        if (length < 0) {
            throw new IllegalArgumentException("length: " + length + " (expected: >= 0)");
        }
        if (length != 0) {
            throw new IndexOutOfBoundsException();
        }
        return this;
    }
}