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.client.block.stream;
  
  import io.netty.buffer.ByteBuf;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Optional;
  
  /**
   * A {@link DataWriter} which writes data to a bytebuffer.
   */
  public class TestDataWriter implements DataWriter {
    private final ByteBuffer mBuffer;
  
    public TestDataWriter(ByteBuffer buffer) {
      mBuffer = buffer;
    }
  
    @Override
    public Optional<String> getUfsContentHash() {
      return Optional.empty();
    }
  
    @Override
    public void writeChunk(ByteBuf chunk) throws IOException {
      try {
        mBuffer.limit(mBuffer.position() + chunk.readableBytes());
        chunk.readBytes(mBuffer);
      } finally {
        chunk.release();
      }
    }
  
    @Override
    public void cancel() {
      return;
    }
  
    @Override
    public void flush() {
      return;
    }
  
    @Override
    public int chunkSize() {
      return 128;
    }
  
    @Override
    public long pos() {
      return mBuffer.position();
    }
  
    @Override
    public void close() {
      return;
    }
  }
  