code: def _CalculateElementsDataSize(self, context):
      
      elements_data_size = None
  
      if self._HasElementsDataSize():
        elements_data_size = self._EvaluateElementsDataSize(context)
  
      elif self._HasNumberOfElements():
        element_byte_size = self._element_data_type_definition.GetByteSize()
        if element_byte_size is not None:
          number_of_elements = self._EvaluateNumberOfElements(context)
          elements_data_size = number_of_elements * element_byte_size
  
      return elements_data_size
docs: Calculates the elements data size.
  
      Args:
        context (Optional[DataTypeMapContext]): data type map context, used to
            determine the size hint.
  
      Returns:
        int: the elements data size or None if not available.