code: def _GetDataStreams(self):
      
      if self._data_streams is None:
        self._data_streams = []
        if self._fsntfs_file_entry.has_default_data_stream():
          data_stream = NTFSDataStream(None)
          self._data_streams.append(data_stream)
  
        for fsntfs_data_stream in self._fsntfs_file_entry.alternate_data_streams:
          data_stream = NTFSDataStream(fsntfs_data_stream)
          self._data_streams.append(data_stream)
  
      return self._data_streams
docs: Retrieves the data streams.
  
      Returns:
        list[NTFSDataStream]: data streams.