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.file;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  
  /**
   * Mock implementation of {@link FileOutStream} which delegates to a {@link ByteArrayOutputStream}.
   */
  public final class MockFileOutStream extends FileOutStream {
    private final ByteArrayOutputStream mStream;
  
    /**
     * Creates a mock {@link FileOutputStream} which will store any bytes written to it for later
     * inspection during tests.
     */
    public MockFileOutStream(FileSystemContext fsContext) throws IOException {
      mStream = new ByteArrayOutputStream();
    }
  
    @Override
    public void cancel() {}
  
    @Override
    public void close() throws IOException {
      mStream.close();
    }
  
    @Override
    public void flush() throws IOException {
      mStream.flush();
    }
  
    @Override
    public void write(int b) {
      mStream.write(b);
    }
  
    @Override
    public void write(byte[] b) throws IOException {
      mStream.write(b);
    }
  
    @Override
    public void write(byte[] b, int off, int len) {
      mStream.write(b, off, len);
    }
  
    /**
     * @return the bytes that have been written to the output stream
     */
    public byte[] toByteArray() {
      return mStream.toByteArray();
    }
  }
  