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Java example source code file (UnpooledHeapByteBuf.java)

This example Java source code file (UnpooledHeapByteBuf.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, closedchannelexception, filechannel, gatheringbytechannel, ioexception, nio, nullpointerexception, outputstream, override, scatteringbytechannel, unpooledheapbytebuf, unsupportedoperationexception

The UnpooledHeapByteBuf.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.buffer;

import io.netty.util.internal.PlatformDependent;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;

/**
 * Big endian Java heap buffer implementation.
 */
public class UnpooledHeapByteBuf extends AbstractReferenceCountedByteBuf {

    private final ByteBufAllocator alloc;
    byte[] array;
    private ByteBuffer tmpNioBuf;

    /**
     * Creates a new heap buffer with a newly allocated byte array.
     *
     * @param initialCapacity the initial capacity of the underlying byte array
     * @param maxCapacity the max capacity of the underlying byte array
     */
    protected UnpooledHeapByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
        this(alloc, new byte[initialCapacity], 0, 0, maxCapacity);
    }

    /**
     * Creates a new heap buffer with an existing byte array.
     *
     * @param initialArray the initial underlying byte array
     * @param maxCapacity the max capacity of the underlying byte array
     */
    protected UnpooledHeapByteBuf(ByteBufAllocator alloc, byte[] initialArray, int maxCapacity) {
        this(alloc, initialArray, 0, initialArray.length, maxCapacity);
    }

    private UnpooledHeapByteBuf(
            ByteBufAllocator alloc, byte[] initialArray, int readerIndex, int writerIndex, int maxCapacity) {

        super(maxCapacity);

        if (alloc == null) {
            throw new NullPointerException("alloc");
        }
        if (initialArray == null) {
            throw new NullPointerException("initialArray");
        }
        if (initialArray.length > maxCapacity) {
            throw new IllegalArgumentException(String.format(
                    "initialCapacity(%d) > maxCapacity(%d)", initialArray.length, maxCapacity));
        }

        this.alloc = alloc;
        setArray(initialArray);
        setIndex(readerIndex, writerIndex);
    }

    private void setArray(byte[] initialArray) {
        array = initialArray;
        tmpNioBuf = null;
    }

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

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

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

    @Override
    public int capacity() {
        ensureAccessible();
        return array.length;
    }

    @Override
    public ByteBuf capacity(int newCapacity) {
        ensureAccessible();
        if (newCapacity < 0 || newCapacity > maxCapacity()) {
            throw new IllegalArgumentException("newCapacity: " + newCapacity);
        }

        int oldCapacity = array.length;
        if (newCapacity > oldCapacity) {
            byte[] newArray = new byte[newCapacity];
            System.arraycopy(array, 0, newArray, 0, array.length);
            setArray(newArray);
        } else if (newCapacity < oldCapacity) {
            byte[] newArray = new byte[newCapacity];
            int readerIndex = readerIndex();
            if (readerIndex < newCapacity) {
                int writerIndex = writerIndex();
                if (writerIndex > newCapacity) {
                    writerIndex(writerIndex = newCapacity);
                }
                System.arraycopy(array, readerIndex, newArray, readerIndex, writerIndex - readerIndex);
            } else {
                setIndex(newCapacity, newCapacity);
            }
            setArray(newArray);
        }
        return this;
    }

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

    @Override
    public byte[] array() {
        ensureAccessible();
        return array;
    }

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

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

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

    @Override
    public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
        checkDstIndex(index, length, dstIndex, dst.capacity());
        if (dst.hasMemoryAddress()) {
            PlatformDependent.copyMemory(array, index, dst.memoryAddress() + dstIndex, length);
        } else if (dst.hasArray()) {
            getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
        } else {
            dst.setBytes(dstIndex, array, index, length);
        }
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
        checkDstIndex(index, length, dstIndex, dst.length);
        System.arraycopy(array, index, dst, dstIndex, length);
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuffer dst) {
        ensureAccessible();
        dst.put(array, index, Math.min(capacity() - index, dst.remaining()));
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
        ensureAccessible();
        out.write(array, index, length);
        return this;
    }

    @Override
    public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
        ensureAccessible();
        return getBytes(index, out, length, false);
    }

    @Override
    public int getBytes(int index, FileChannel out, long position, int length) throws IOException {
        ensureAccessible();
        return getBytes(index, out, position, length, false);
    }

    private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
        ensureAccessible();
        ByteBuffer tmpBuf;
        if (internal) {
            tmpBuf = internalNioBuffer();
        } else {
            tmpBuf = ByteBuffer.wrap(array);
        }
        return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length));
    }

    private int getBytes(int index, FileChannel out, long position, int length, boolean internal) throws IOException {
        ensureAccessible();
        ByteBuffer tmpBuf = internal ? internalNioBuffer() : ByteBuffer.wrap(array);
        return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length), position);
    }

    @Override
    public int readBytes(GatheringByteChannel out, int length) throws IOException {
        checkReadableBytes(length);
        int readBytes = getBytes(readerIndex, out, length, true);
        readerIndex += readBytes;
        return readBytes;
    }

    @Override
    public int readBytes(FileChannel out, long position, int length) throws IOException {
        checkReadableBytes(length);
        int readBytes = getBytes(readerIndex, out, position, length, true);
        readerIndex += readBytes;
        return readBytes;
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
        checkSrcIndex(index, length, srcIndex, src.capacity());
        if (src.hasMemoryAddress()) {
            PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, array, index, length);
        } else  if (src.hasArray()) {
            setBytes(index, src.array(), src.arrayOffset() + srcIndex, length);
        } else {
            src.getBytes(srcIndex, array, index, length);
        }
        return this;
    }

    @Override
    public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
        checkSrcIndex(index, length, srcIndex, src.length);
        System.arraycopy(src, srcIndex, array, index, length);
        return this;
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuffer src) {
        ensureAccessible();
        src.get(array, index, src.remaining());
        return this;
    }

    @Override
    public int setBytes(int index, InputStream in, int length) throws IOException {
        ensureAccessible();
        return in.read(array, index, length);
    }

    @Override
    public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
        ensureAccessible();
        try {
            return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length));
        } catch (ClosedChannelException ignored) {
            return -1;
        }
    }

    @Override
    public int setBytes(int index, FileChannel in, long position, int length) throws IOException {
        ensureAccessible();
        try {
            return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length), position);
        } catch (ClosedChannelException ignored) {
            return -1;
        }
    }

    @Override
    public int nioBufferCount() {
        return 1;
    }

    @Override
    public ByteBuffer nioBuffer(int index, int length) {
        ensureAccessible();
        return ByteBuffer.wrap(array, index, length).slice();
    }

    @Override
    public ByteBuffer[] nioBuffers(int index, int length) {
        return new ByteBuffer[] { nioBuffer(index, length) };
    }

    @Override
    public ByteBuffer internalNioBuffer(int index, int length) {
        checkIndex(index, length);
        return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
    }

    @Override
    public byte getByte(int index) {
        ensureAccessible();
        return _getByte(index);
    }

    @Override
    protected byte _getByte(int index) {
        return HeapByteBufUtil.getByte(array, index);
    }

    @Override
    public short getShort(int index) {
        ensureAccessible();
        return _getShort(index);
    }

    @Override
    protected short _getShort(int index) {
        return HeapByteBufUtil.getShort(array, index);
    }

    @Override
    public short getShortLE(int index) {
        ensureAccessible();
        return _getShortLE(index);
    }

    @Override
    protected short _getShortLE(int index) {
        return HeapByteBufUtil.getShortLE(array, index);
    }

    @Override
    public int getUnsignedMedium(int index) {
        ensureAccessible();
        return _getUnsignedMedium(index);
    }

    @Override
    protected int _getUnsignedMedium(int index) {
        return HeapByteBufUtil.getUnsignedMedium(array, index);
    }

    @Override
    public int getUnsignedMediumLE(int index) {
        ensureAccessible();
        return _getUnsignedMediumLE(index);
    }

    @Override
    protected int _getUnsignedMediumLE(int index) {
        return HeapByteBufUtil.getUnsignedMediumLE(array, index);
    }

    @Override
    public int getInt(int index) {
        ensureAccessible();
        return _getInt(index);
    }

    @Override
    protected int _getInt(int index) {
        return HeapByteBufUtil.getInt(array, index);
    }

    @Override
    public int getIntLE(int index) {
        ensureAccessible();
        return _getIntLE(index);
    }

    @Override
    protected int _getIntLE(int index) {
        return HeapByteBufUtil.getIntLE(array, index);
    }

    @Override
    public long getLong(int index) {
        ensureAccessible();
        return _getLong(index);
    }

    @Override
    protected long _getLong(int index) {
        return HeapByteBufUtil.getLong(array, index);
    }

    @Override
    public long getLongLE(int index) {
        ensureAccessible();
        return _getLongLE(index);
    }

    @Override
    protected long _getLongLE(int index) {
        return HeapByteBufUtil.getLongLE(array, index);
    }

    @Override
    public ByteBuf setByte(int index, int value) {
        ensureAccessible();
        _setByte(index, value);
        return this;
    }

    @Override
    protected void _setByte(int index, int value) {
        HeapByteBufUtil.setByte(array, index, value);
    }

    @Override
    public ByteBuf setShort(int index, int value) {
        ensureAccessible();
        _setShort(index, value);
        return this;
    }

    @Override
    protected void _setShort(int index, int value) {
        HeapByteBufUtil.setShort(array, index, value);
    }

    @Override
    public ByteBuf setShortLE(int index, int value) {
        ensureAccessible();
        _setShortLE(index, value);
        return this;
    }

    @Override
    protected void _setShortLE(int index, int value) {
        HeapByteBufUtil.setShortLE(array, index, value);
    }

    @Override
    public ByteBuf setMedium(int index, int   value) {
        ensureAccessible();
        _setMedium(index, value);
        return this;
    }

    @Override
    protected void _setMedium(int index, int value) {
        HeapByteBufUtil.setMedium(array, index, value);
    }

    @Override
    public ByteBuf setMediumLE(int index, int   value) {
        ensureAccessible();
        _setMediumLE(index, value);
        return this;
    }

    @Override
    protected void _setMediumLE(int index, int value) {
        HeapByteBufUtil.setMediumLE(array, index, value);
    }

    @Override
    public ByteBuf setInt(int index, int   value) {
        ensureAccessible();
        _setInt(index, value);
        return this;
    }

    @Override
    protected void _setInt(int index, int value) {
        HeapByteBufUtil.setInt(array, index, value);
    }

    @Override
    public ByteBuf setIntLE(int index, int   value) {
        ensureAccessible();
        _setIntLE(index, value);
        return this;
    }

    @Override
    protected void _setIntLE(int index, int value) {
        HeapByteBufUtil.setIntLE(array, index, value);
    }

    @Override
    public ByteBuf setLong(int index, long  value) {
        ensureAccessible();
        _setLong(index, value);
        return this;
    }

    @Override
    protected void _setLong(int index, long value) {
        HeapByteBufUtil.setLong(array, index, value);
    }

    @Override
    public ByteBuf setLongLE(int index, long  value) {
        ensureAccessible();
        _setLongLE(index, value);
        return this;
    }

    @Override
    protected void _setLongLE(int index, long value) {
        HeapByteBufUtil.setLongLE(array, index, value);
    }

    @Override
    public ByteBuf copy(int index, int length) {
        checkIndex(index, length);
        byte[] copiedArray = new byte[length];
        System.arraycopy(array, index, copiedArray, 0, length);
        return new UnpooledHeapByteBuf(alloc(), copiedArray, maxCapacity());
    }

    private ByteBuffer internalNioBuffer() {
        ByteBuffer tmpNioBuf = this.tmpNioBuf;
        if (tmpNioBuf == null) {
            this.tmpNioBuf = tmpNioBuf = ByteBuffer.wrap(array);
        }
        return tmpNioBuf;
    }

    @Override
    protected void deallocate() {
        array = null;
    }

    @Override
    public ByteBuf unwrap() {
        return null;
    }
}

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