code: public byte[] getFileHandle() throws IOException {
          if (_isRootFile) {
              return getNfs().getRootFileHandle();
          }
          if (_fileHandle == null) {
              setFileHandle();
          }
          return (_fileHandle == null) ? null : _fileHandle.clone();
      }
docs: /*
  (non-Javadoc)
  
  @see com.emc.ecs.nfsclient.util.NfsFile#getFileHandle()