alluxio.network.protocol.databuffer.ByteArrayDataBuffer.java Source code

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Here is the source code for alluxio.network.protocol.databuffer.ByteArrayDataBuffer.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.network.protocol.databuffer;

import com.google.common.base.Preconditions;
import io.netty.buffer.Unpooled;

import java.io.OutputStream;
import java.nio.ByteBuffer;

/**
 * A DataBuffer backed by a byte[].
 */
public final class ByteArrayDataBuffer implements DataBuffer {
    private final byte[] mByteArray;
    private final long mOffset;
    private final long mLength;

    /**
     * @param byteArray the array representing the data
     * @param offset the offset into the byteArray
     * @param length the length of the data
     */
    public ByteArrayDataBuffer(byte[] byteArray, long offset, long length) {
        mByteArray = Preconditions.checkNotNull(byteArray, "byteArray");
        mOffset = offset;
        mLength = length;
    }

    @Override
    public Object getNettyOutput() {
        return Unpooled.wrappedBuffer(mByteArray, (int) mOffset, (int) mLength);
    }

    @Override
    public long getLength() {
        return mLength;
    }

    @Override
    public ByteBuffer getReadOnlyByteBuffer() {
        return ByteBuffer.wrap(mByteArray, (int) mOffset, (int) mLength).asReadOnlyBuffer();
    }

    @Override
    public void readBytes(byte[] dst, int dstIndex, int length) {
        throw new UnsupportedOperationException(
                "ByteArrayDataBuffer#readBytes(byte[] dst, int dstIndex, int length) is not implemented.");
    }

    @Override
    public void readBytes(OutputStream outputStream, int length) {
        throw new UnsupportedOperationException(
                "ByteArrayDataBuffer#readBytes(OutputStream outputStream, int length) is not implemented.");
    }

    @Override
    public void readBytes(ByteBuffer outputBuf) {
        throw new UnsupportedOperationException(
                "ByteArrayDataBuffer#readBytes(ByteBuffer outputBuf) is not implemented.");
    }

    @Override
    public int readableBytes() {
        throw new UnsupportedOperationException("ByteArrayDataBuffer#readableBytes() is not implemented.");
    }

    @Override
    public void release() {
        // Nothing we need to release explicitly, let GC take care of all objects.
    }
}