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);
  }
@ Override public long skip ( long n ) throws IOException { checkState ( InputStream . class ) ; return ( ( InputStream ) stream ) . skip ( n ) ; }
InputStream
InputStream