/** Factory for {@link ByteSource} instances. */
  public interface ByteSourceFactory extends SourceFactory<ByteSource, byte[]> {}

  /** Factory for {@link ByteSink} instances. */
  public interface ByteSinkFactory extends SinkFactory<ByteSink, byte[]> {}

  /** Factory for {@link CharSource} instances. */
  public interface CharSourceFactory extends SourceFactory<CharSource, String> {}

  /** Factory for {@link CharSink} instances. */