alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ReplayingDecoderByteBuf.java)

This example Java source code file (ReplayingDecoderByteBuf.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuf, bytebufallocator, bytebuffer, byteorder, byteprocessor, charsequence, charset, filechannel, nio, override, replay, replayingdecoderbytebuf, string, swappedbytebuf, unsupportedoperationexception

The ReplayingDecoderByteBuf.java Java example source code

/*
 * Copyright 2012 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.handler.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.SwappedByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.util.ByteProcessor;
import io.netty.util.Signal;
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.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.nio.charset.Charset;

/**
 * Special {@link ByteBuf} implementation which is used by the {@link ReplayingDecoder}
 */
final class ReplayingDecoderByteBuf extends ByteBuf {

    private static final Signal REPLAY = ReplayingDecoder.REPLAY;

    private ByteBuf buffer;
    private boolean terminated;
    private SwappedByteBuf swapped;

    static final ReplayingDecoderByteBuf EMPTY_BUFFER = new ReplayingDecoderByteBuf(Unpooled.EMPTY_BUFFER);

    static {
        EMPTY_BUFFER.terminate();
    }

    ReplayingDecoderByteBuf() { }

    ReplayingDecoderByteBuf(ByteBuf buffer) {
        setCumulation(buffer);
    }

    void setCumulation(ByteBuf buffer) {
        this.buffer = buffer;
    }

    void terminate() {
        terminated = true;
    }

    @Override
    public int capacity() {
        if (terminated) {
            return buffer.capacity();
        } else {
            return Integer.MAX_VALUE;
        }
    }

    @Override
    public ByteBuf capacity(int newCapacity) {
        throw reject();
    }

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

    @Override
    public ByteBufAllocator alloc() {
        return buffer.alloc();
    }

    @Override
    public boolean isReadOnly() {
        return false;
    }

    @SuppressWarnings("deprecation")
    @Override
    public ByteBuf asReadOnly() {
        return Unpooled.unmodifiableBuffer(this);
    }

    @Override
    public boolean isDirect() {
        return buffer.isDirect();
    }

    @Override
    public boolean hasArray() {
        return false;
    }

    @Override
    public byte[] array() {
        throw new UnsupportedOperationException();
    }

    @Override
    public int arrayOffset() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean hasMemoryAddress() {
        return false;
    }

    @Override
    public long memoryAddress() {
        throw new UnsupportedOperationException();
    }

    @Override
    public ByteBuf clear() {
        throw reject();
    }

    @Override
    public boolean equals(Object obj) {
        return this == obj;
    }

    @Override
    public int compareTo(ByteBuf buffer) {
        throw reject();
    }

    @Override
    public ByteBuf copy() {
        throw reject();
    }

    @Override
    public ByteBuf copy(int index, int length) {
        checkIndex(index, length);
        return buffer.copy(index, length);
    }

    @Override
    public ByteBuf discardReadBytes() {
        throw reject();
    }

    @Override
    public ByteBuf ensureWritable(int writableBytes) {
        throw reject();
    }

    @Override
    public int ensureWritable(int minWritableBytes, boolean force) {
        throw reject();
    }

    @Override
    public ByteBuf duplicate() {
        throw reject();
    }

    @Override
    public ByteBuf retainedDuplicate() {
        throw reject();
    }

    @Override
    public boolean getBoolean(int index) {
        checkIndex(index, 1);
        return buffer.getBoolean(index);
    }

    @Override
    public byte getByte(int index) {
        checkIndex(index, 1);
        return buffer.getByte(index);
    }

    @Override
    public short getUnsignedByte(int index) {
        checkIndex(index, 1);
        return buffer.getUnsignedByte(index);
    }

    @Override
    public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
        checkIndex(index, length);
        buffer.getBytes(index, dst, dstIndex, length);
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, byte[] dst) {
        checkIndex(index, dst.length);
        buffer.getBytes(index, dst);
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuffer dst) {
        throw reject();
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
        checkIndex(index, length);
        buffer.getBytes(index, dst, dstIndex, length);
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuf dst, int length) {
        throw reject();
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuf dst) {
        throw reject();
    }

    @Override
    public int getBytes(int index, GatheringByteChannel out, int length) {
        throw reject();
    }

    @Override
    public int getBytes(int index, FileChannel out, long position, int length) {
        throw reject();
    }

    @Override
    public ByteBuf getBytes(int index, OutputStream out, int length) {
        throw reject();
    }

    @Override
    public int getInt(int index) {
        checkIndex(index, 4);
        return buffer.getInt(index);
    }

    @Override
    public int getIntLE(int index) {
        checkIndex(index, 4);
        return buffer.getIntLE(index);
    }

    @Override
    public long getUnsignedInt(int index) {
        checkIndex(index, 4);
        return buffer.getUnsignedInt(index);
    }

    @Override
    public long getUnsignedIntLE(int index) {
        checkIndex(index, 4);
        return buffer.getUnsignedIntLE(index);
    }

    @Override
    public long getLong(int index) {
        checkIndex(index, 8);
        return buffer.getLong(index);
    }

    @Override
    public long getLongLE(int index) {
        checkIndex(index, 8);
        return buffer.getLongLE(index);
    }

    @Override
    public int getMedium(int index) {
        checkIndex(index, 3);
        return buffer.getMedium(index);
    }

    @Override
    public int getMediumLE(int index) {
        checkIndex(index, 3);
        return buffer.getMediumLE(index);
    }

    @Override
    public int getUnsignedMedium(int index) {
        checkIndex(index, 3);
        return buffer.getUnsignedMedium(index);
    }

    @Override
    public int getUnsignedMediumLE(int index) {
        checkIndex(index, 3);
        return buffer.getUnsignedMediumLE(index);
    }

    @Override
    public short getShort(int index) {
        checkIndex(index, 2);
        return buffer.getShort(index);
    }

    @Override
    public short getShortLE(int index) {
        checkIndex(index, 2);
        return buffer.getShortLE(index);
    }

    @Override
    public int getUnsignedShort(int index) {
        checkIndex(index, 2);
        return buffer.getUnsignedShort(index);
    }

    @Override
    public int getUnsignedShortLE(int index) {
        checkIndex(index, 2);
        return buffer.getUnsignedShortLE(index);
    }

    @Override
    public char getChar(int index) {
        checkIndex(index, 2);
        return buffer.getChar(index);
    }

    @Override
    public float getFloat(int index) {
        checkIndex(index, 4);
        return buffer.getFloat(index);
    }

    @Override
    public double getDouble(int index) {
        checkIndex(index, 8);
        return buffer.getDouble(index);
    }

    @Override
    public CharSequence getCharSequence(int index, int length, Charset charset) {
        checkIndex(index, length);
        return buffer.getCharSequence(index, length, charset);
    }

    @Override
    public int hashCode() {
        throw reject();
    }

    @Override
    public int indexOf(int fromIndex, int toIndex, byte value) {
        if (fromIndex == toIndex) {
            return -1;
        }

        if (Math.max(fromIndex, toIndex) > buffer.writerIndex()) {
            throw REPLAY;
        }

        return buffer.indexOf(fromIndex, toIndex, value);
    }

    @Override
    public int bytesBefore(byte value) {
        int bytes = buffer.bytesBefore(value);
        if (bytes < 0) {
            throw REPLAY;
        }
        return bytes;
    }

    @Override
    public int bytesBefore(int length, byte value) {
        return bytesBefore(buffer.readerIndex(), length, value);
    }

    @Override
    public int bytesBefore(int index, int length, byte value) {
        final int writerIndex = buffer.writerIndex();
        if (index >= writerIndex) {
            throw REPLAY;
        }

        if (index <= writerIndex - length) {
            return buffer.bytesBefore(index, length, value);
        }

        int res = buffer.bytesBefore(index, writerIndex - index, value);
        if (res < 0) {
            throw REPLAY;
        } else {
            return res;
        }
    }

    @Override
    public int forEachByte(ByteProcessor processor) {
        int ret = buffer.forEachByte(processor);
        if (ret < 0) {
            throw REPLAY;
        } else {
            return ret;
        }
    }

    @Override
    public int forEachByte(int index, int length, ByteProcessor processor) {
        final int writerIndex = buffer.writerIndex();
        if (index >= writerIndex) {
            throw REPLAY;
        }

        if (index <= writerIndex - length) {
            return buffer.forEachByte(index, length, processor);
        }

        int ret = buffer.forEachByte(index, writerIndex - index, processor);
        if (ret < 0) {
            throw REPLAY;
        } else {
            return ret;
        }
    }

    @Override
    public int forEachByteDesc(ByteProcessor processor) {
        if (terminated) {
            return buffer.forEachByteDesc(processor);
        } else {
            throw reject();
        }
    }

    @Override
    public int forEachByteDesc(int index, int length, ByteProcessor processor) {
        if (index + length > buffer.writerIndex()) {
            throw REPLAY;
        }

        return buffer.forEachByteDesc(index, length, processor);
    }

    @Override
    public ByteBuf markReaderIndex() {
        buffer.markReaderIndex();
        return this;
    }

    @Override
    public ByteBuf markWriterIndex() {
        throw reject();
    }

    @Override
    public ByteOrder order() {
        return buffer.order();
    }

    @Override
    public ByteBuf order(ByteOrder endianness) {
        if (endianness == null) {
            throw new NullPointerException("endianness");
        }
        if (endianness == order()) {
            return this;
        }

        SwappedByteBuf swapped = this.swapped;
        if (swapped == null) {
            this.swapped = swapped = new SwappedByteBuf(this);
        }
        return swapped;
    }

    @Override
    public boolean isReadable() {
        return terminated? buffer.isReadable() : true;
    }

    @Override
    public boolean isReadable(int size) {
        return terminated? buffer.isReadable(size) : true;
    }

    @Override
    public int readableBytes() {
        if (terminated) {
            return buffer.readableBytes();
        } else {
            return Integer.MAX_VALUE - buffer.readerIndex();
        }
    }

    @Override
    public boolean readBoolean() {
        checkReadableBytes(1);
        return buffer.readBoolean();
    }

    @Override
    public byte readByte() {
        checkReadableBytes(1);
        return buffer.readByte();
    }

    @Override
    public short readUnsignedByte() {
        checkReadableBytes(1);
        return buffer.readUnsignedByte();
    }

    @Override
    public ByteBuf readBytes(byte[] dst, int dstIndex, int length) {
        checkReadableBytes(length);
        buffer.readBytes(dst, dstIndex, length);
        return this;
    }

    @Override
    public ByteBuf readBytes(byte[] dst) {
        checkReadableBytes(dst.length);
        buffer.readBytes(dst);
        return this;
    }

    @Override
    public ByteBuf readBytes(ByteBuffer dst) {
        throw reject();
    }

    @Override
    public ByteBuf readBytes(ByteBuf dst, int dstIndex, int length) {
        checkReadableBytes(length);
        buffer.readBytes(dst, dstIndex, length);
        return this;
    }

    @Override
    public ByteBuf readBytes(ByteBuf dst, int length) {
        throw reject();
    }

    @Override
    public ByteBuf readBytes(ByteBuf dst) {
        checkReadableBytes(dst.writableBytes());
        buffer.readBytes(dst);
        return this;
    }

    @Override
    public int readBytes(GatheringByteChannel out, int length) {
        throw reject();
    }

    @Override
    public int readBytes(FileChannel out, long position, int length) {
        throw reject();
    }

    @Override
    public ByteBuf readBytes(int length) {
        checkReadableBytes(length);
        return buffer.readBytes(length);
    }

    @Override
    public ByteBuf readSlice(int length) {
        checkReadableBytes(length);
        return buffer.readSlice(length);
    }

    @Override
    public ByteBuf readRetainedSlice(int length) {
        checkReadableBytes(length);
        return buffer.readRetainedSlice(length);
    }

    @Override
    public ByteBuf readBytes(OutputStream out, int length) {
        throw reject();
    }

    @Override
    public int readerIndex() {
        return buffer.readerIndex();
    }

    @Override
    public ByteBuf readerIndex(int readerIndex) {
        buffer.readerIndex(readerIndex);
        return this;
    }

    @Override
    public int readInt() {
        checkReadableBytes(4);
        return buffer.readInt();
    }

    @Override
    public int readIntLE() {
        checkReadableBytes(4);
        return buffer.readIntLE();
    }

    @Override
    public long readUnsignedInt() {
        checkReadableBytes(4);
        return buffer.readUnsignedInt();
    }

    @Override
    public long readUnsignedIntLE() {
        checkReadableBytes(4);
        return buffer.readUnsignedIntLE();
    }

    @Override
    public long readLong() {
        checkReadableBytes(8);
        return buffer.readLong();
    }

    @Override
    public long readLongLE() {
        checkReadableBytes(8);
        return buffer.readLongLE();
    }

    @Override
    public int readMedium() {
        checkReadableBytes(3);
        return buffer.readMedium();
    }

    @Override
    public int readMediumLE() {
        checkReadableBytes(3);
        return buffer.readMediumLE();
    }

    @Override
    public int readUnsignedMedium() {
        checkReadableBytes(3);
        return buffer.readUnsignedMedium();
    }

    @Override
    public int readUnsignedMediumLE() {
        checkReadableBytes(3);
        return buffer.readUnsignedMediumLE();
    }

    @Override
    public short readShort() {
        checkReadableBytes(2);
        return buffer.readShort();
    }

    @Override
    public short readShortLE() {
        checkReadableBytes(2);
        return buffer.readShortLE();
    }

    @Override
    public int readUnsignedShort() {
        checkReadableBytes(2);
        return buffer.readUnsignedShort();
    }

    @Override
    public int readUnsignedShortLE() {
        checkReadableBytes(2);
        return buffer.readUnsignedShortLE();
    }

    @Override
    public char readChar() {
        checkReadableBytes(2);
        return buffer.readChar();
    }

    @Override
    public float readFloat() {
        checkReadableBytes(4);
        return buffer.readFloat();
    }

    @Override
    public double readDouble() {
        checkReadableBytes(8);
        return buffer.readDouble();
    }

    @Override
    public CharSequence readCharSequence(int length, Charset charset) {
        checkReadableBytes(length);
        return buffer.readCharSequence(length, charset);
    }

    @Override
    public ByteBuf resetReaderIndex() {
        buffer.resetReaderIndex();
        return this;
    }

    @Override
    public ByteBuf resetWriterIndex() {
        throw reject();
    }

    @Override
    public ByteBuf setBoolean(int index, boolean value) {
        throw reject();
    }

    @Override
    public ByteBuf setByte(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, byte[] src) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuffer src) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuf src, int length) {
        throw reject();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuf src) {
        throw reject();
    }

    @Override
    public int setBytes(int index, InputStream in, int length) {
        throw reject();
    }

    @Override
    public ByteBuf setZero(int index, int length) {
        throw reject();
    }

    @Override
    public int setBytes(int index, ScatteringByteChannel in, int length) {
        throw reject();
    }

    @Override
    public int setBytes(int index, FileChannel in, long position, int length) {
        throw reject();
    }

    @Override
    public ByteBuf setIndex(int readerIndex, int writerIndex) {
        throw reject();
    }

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

    @Override
    public ByteBuf setIntLE(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setLong(int index, long value) {
        throw reject();
    }

    @Override
    public ByteBuf setLongLE(int index, long value) {
        throw reject();
    }

    @Override
    public ByteBuf setMedium(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setMediumLE(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setShort(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setShortLE(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setChar(int index, int value) {
        throw reject();
    }

    @Override
    public ByteBuf setFloat(int index, float value) {
        throw reject();
    }

    @Override
    public ByteBuf setDouble(int index, double value) {
        throw reject();
    }

    @Override
    public ByteBuf skipBytes(int length) {
        checkReadableBytes(length);
        buffer.skipBytes(length);
        return this;
    }

    @Override
    public ByteBuf slice() {
        throw reject();
    }

    @Override
    public ByteBuf retainedSlice() {
        throw reject();
    }

    @Override
    public ByteBuf slice(int index, int length) {
        checkIndex(index, length);
        return buffer.slice(index, length);
    }

    @Override
    public ByteBuf retainedSlice(int index, int length) {
        checkIndex(index, length);
        return buffer.slice(index, length);
    }

    @Override
    public int nioBufferCount() {
        return buffer.nioBufferCount();
    }

    @Override
    public ByteBuffer nioBuffer() {
        throw reject();
    }

    @Override
    public ByteBuffer nioBuffer(int index, int length) {
        checkIndex(index, length);
        return buffer.nioBuffer(index, length);
    }

    @Override
    public ByteBuffer[] nioBuffers() {
        throw reject();
    }

    @Override
    public ByteBuffer[] nioBuffers(int index, int length) {
        checkIndex(index, length);
        return buffer.nioBuffers(index, length);
    }

    @Override
    public ByteBuffer internalNioBuffer(int index, int length) {
        checkIndex(index, length);
        return buffer.internalNioBuffer(index, length);
    }

    @Override
    public String toString(int index, int length, Charset charset) {
        checkIndex(index, length);
        return buffer.toString(index, length, charset);
    }

    @Override
    public String toString(Charset charsetName) {
        throw reject();
    }

    @Override
    public String toString() {
        return StringUtil.simpleClassName(this) + '(' +
               "ridx=" +
               readerIndex() +
               ", " +
               "widx=" +
               writerIndex() +
               ')';
    }

    @Override
    public boolean isWritable() {
        return false;
    }

    @Override
    public boolean isWritable(int size) {
        return false;
    }

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

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

    @Override
    public ByteBuf writeBoolean(boolean value) {
        throw reject();
    }

    @Override
    public ByteBuf writeByte(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(byte[] src, int srcIndex, int length) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(byte[] src) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(ByteBuffer src) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(ByteBuf src, int srcIndex, int length) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(ByteBuf src, int length) {
        throw reject();
    }

    @Override
    public ByteBuf writeBytes(ByteBuf src) {
        throw reject();
    }

    @Override
    public int writeBytes(InputStream in, int length) {
        throw reject();
    }

    @Override
    public int writeBytes(ScatteringByteChannel in, int length) {
        throw reject();
    }

    @Override
    public int writeBytes(FileChannel in, long position, int length) {
        throw reject();
    }

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

    @Override
    public ByteBuf writeIntLE(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeLong(long value) {
        throw reject();
    }

    @Override
    public ByteBuf writeLongLE(long value) {
        throw reject();
    }

    @Override
    public ByteBuf writeMedium(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeMediumLE(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeZero(int length) {
        throw reject();
    }

    @Override
    public int writerIndex() {
        return buffer.writerIndex();
    }

    @Override
    public ByteBuf writerIndex(int writerIndex) {
        throw reject();
    }

    @Override
    public ByteBuf writeShort(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeShortLE(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeChar(int value) {
        throw reject();
    }

    @Override
    public ByteBuf writeFloat(float value) {
        throw reject();
    }

    @Override
    public ByteBuf writeDouble(double value) {
        throw reject();
    }

    @Override
    public int setCharSequence(int index, CharSequence sequence, Charset charset) {
        throw reject();
    }

    @Override
    public int writeCharSequence(CharSequence sequence, Charset charset) {
        throw reject();
    }

    private void checkIndex(int index, int length) {
        if (index + length > buffer.writerIndex()) {
            throw REPLAY;
        }
    }

    private void checkReadableBytes(int readableBytes) {
        if (buffer.readableBytes() < readableBytes) {
            throw REPLAY;
        }
    }

    @Override
    public ByteBuf discardSomeReadBytes() {
        throw reject();
    }

    @Override
    public int refCnt() {
        return buffer.refCnt();
    }

    @Override
    public ByteBuf retain() {
        throw reject();
    }

    @Override
    public ByteBuf retain(int increment) {
        throw reject();
    }

    @Override
    public ByteBuf touch() {
        buffer.touch();
        return this;
    }

    @Override
    public ByteBuf touch(Object hint) {
        buffer.touch(hint);
        return this;
    }

    @Override
    public boolean release() {
        throw reject();
    }

    @Override
    public boolean release(int decrement) {
        throw reject();
    }

    @Override
    public ByteBuf unwrap() {
        throw reject();
    }

    private static UnsupportedOperationException reject() {
        return new UnsupportedOperationException("not a replayable operation");
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java ReplayingDecoderByteBuf.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.