content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.beam.sdk.io;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import org.apache.beam.sdk.io.FileBasedSink.WritableByteChannelFactory;
  import org.apache.beam.sdk.util.MimeTypes;
  
  /**
   * {@link WritableByteChannelFactory} implementation useful for testing that creates a {@link
   * WritableByteChannel} that writes everything twice.
   */
  public class DrunkWritableByteChannelFactory implements WritableByteChannelFactory {
    @Override
    public WritableByteChannel create(WritableByteChannel channel) throws IOException {
      return new DrunkWritableByteChannel(channel);
    }
  
    @Override
    public String getMimeType() {
      return MimeTypes.TEXT;
    }
  
    @Override
    public String getSuggestedFilenameSuffix() {
      return ".drunk";
    }
  
    @Override
    public String toString() {
      return "DRUNK";
    }
  
    /** WritableByteChannel that writes everything twice. */
    private static class DrunkWritableByteChannel implements WritableByteChannel {
      protected final WritableByteChannel channel;
  
      public DrunkWritableByteChannel(final WritableByteChannel channel) {
        this.channel = channel;
      }
  
      @Override
      public boolean isOpen() {
        return channel.isOpen();
      }
  
      @Override
      public void close() throws IOException {
        channel.close();
      }
  
      @Override
      public int write(ByteBuffer src) throws IOException {
        final int w1 = channel.write(src);
        src.rewind();
        final int w2 = channel.write(src);
        return w1 + w2;
      }
    }
  }
  