code: def GetSources(self, event):
      
      if self.DATA_TYPE != event.data_type:
        raise errors.WrongFormatter('Unsupported data type: {0:s}.'.format(
            event.data_type))
  
      file_system_type = getattr(event, 'file_system_type', 'UNKNOWN')
      timestamp_desc = getattr(event, 'timestamp_desc', 'Time')
      source_long = '{0:s} {1:s}'.format(file_system_type, timestamp_desc)
  
      return self.SOURCE_SHORT, source_long
docs: Determines the the short and long source for an event object.
  
      Args:
        event (EventObject): event.
  
      Returns:
        tuple(str, str): short and long source string.
  
      Raises:
        WrongFormatter: if the event object cannot be formatted by the formatter.