guavasupport/src/main/java/com/streamsets/pipeline/lib/io/fileref/AbstractWrapperStream.java
@Override
  public long skip(long n) throws IOException {
    checkState(InputStream.class);
    return ((InputStream)stream).skip(n);
  }
@Override
  public long skip(long n) throws IOException {
    checkState(InputStream.class);
    return ((InputStream)stream).skip(n);
  }
InputStream