code: def _GetDataStreams(self):
      
      if self._data_streams is None:
        if self._directory is None:
          self._directory = self._GetDirectory()
  
        self._data_streams = []
  
        # It is assumed that directory and link file entries typically
        # do not have data streams.
        if not self._directory and not self.link:
          data_stream = DataStream()
          self._data_streams.append(data_stream)
  
      return self._data_streams
docs: Retrieves the data streams.
  
      Returns:
        list[DataStream]: data streams.