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 io.netty.buffer.ByteBuf;
  
  import java.io.ByteArrayInputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.Channels;
  import java.nio.channels.ReadableByteChannel;
  
  /**
   * A simple {@link BlockReader} to use for testing purposes.
   */
  public final class MockBlockReader extends BlockReader {
    private final byte[] mBytes;
    private boolean mClosed;
  
    /**
     * Constructs a mock block reader which will read the given data.
     *
     * @param bytes the bytes to read from
     */
    public MockBlockReader(byte[] bytes) {
      mBytes = bytes;
      mClosed = false;
    }
  
    @Override
    public void close() {
      mClosed = true;
    }
  
    @Override
    public ByteBuffer read(long offset, long length) {
      return ByteBuffer.wrap(mBytes, (int) offset, (int) length);
    }
  
    @Override
    public int transferTo(ByteBuf buf) {
      int remaining = buf.readableBytes();
      return buf.writeBytes(mBytes).readableBytes() - remaining;
    }
  
    @Override
    public boolean isClosed() {
      return mClosed;
    }
  
    @Override
    public long getLength() {
      return mBytes.length;
    }
  
    @Override
    public ReadableByteChannel getChannel() {
      return Channels.newChannel(new ByteArrayInputStream(mBytes));
    }
  
    @Override
    public String getLocation() {
      return "mock";
    }
  }
  