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.worker.block.io;
  
  import com.google.common.io.Closer;
  import io.netty.buffer.ByteBuf;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.ReadableByteChannel;
  
  /**
   * An delegating reader class.
   */
  public class DelegatingBlockReader extends BlockReader {
    private final BlockReader mBlockReader;
    private final Closer mCloser;
  
    /**
     * Default constructor for the abstract reader implementations.
     * @param blockReader block reader
     * @param closeable closer
     */
    public DelegatingBlockReader(BlockReader blockReader, Closeable closeable) {
      mCloser = Closer.create();
      mBlockReader = mCloser.register(blockReader);
      mCloser.register(closeable);
    }
  
    /**
     * @return the delegate
     */
    public BlockReader getDelegate() {
      return mBlockReader;
    }
  
    @Override
    public ByteBuffer read(long offset, long length) throws IOException {
      return mBlockReader.read(offset, length);
    }
  
    @Override
    public long getLength() {
      return mBlockReader.getLength();
    }
  
    @Override
    public ReadableByteChannel getChannel() {
      return mBlockReader.getChannel();
    }
  
    @Override
    public int transferTo(ByteBuf buf) throws IOException {
      return mBlockReader.transferTo(buf);
    }
  
    @Override
    public boolean isClosed() {
      return mBlockReader.isClosed();
    }
  
    @Override
    public String getLocation() {
      return mBlockReader.getLocation();
    }
  
    @Override
    public String toString() {
      return mBlockReader.toString();
    }
  
    @Override
    public void close() throws IOException {
      mCloser.close();
    }
  }
  