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.grpc;
  
  import alluxio.network.protocol.databuffer.DataBuffer;
  
  import io.grpc.internal.ReadableBuffer;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  
  /**
   * Class for making wrapping {@link ReadableBuffer} as {@link DataBuffer}.
   */
  public class ReadableDataBuffer implements DataBuffer {
    private final ReadableBuffer mBuffer;
  
    /**
     * Creates {@link DataBuffer} for reading.
     * @param buffer internal buffer
     */
    public ReadableDataBuffer(ReadableBuffer buffer) {
      mBuffer = buffer;
    }
  
    @Override
    public Object getNettyOutput() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public long getLength() {
      return mBuffer.readableBytes();
    }
  
    @Override
    public ByteBuffer getReadOnlyByteBuffer() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public void readBytes(ByteBuffer outputBuf) {
      mBuffer.readBytes(outputBuf);
    }
  
    @Override
    public void readBytes(byte[] dst, int dstIndex, int length) {
      mBuffer.readBytes(dst, dstIndex, length);
    }
  
    @Override
    public void readBytes(OutputStream outputStream, int length) throws IOException {
      mBuffer.readBytes(outputStream, length);
    }
  
    @Override
    public int readableBytes() {
      return mBuffer.readableBytes();
    }
  
    @Override
    public void release() {
      mBuffer.close();
    }
  }
  