content: /*
   * 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.
    }
  }
  