def _ReadEventDataIntoEvent(self, event):
    """Reads the data into the event.

    This function is intended to offer backwards compatible event behavior.

    Args:
      event (EventObject): event.
    """
    if self._storage_type != definitions.STORAGE_TYPE_SESSION:
      return

    event_data_identifier = event.GetEventDataIdentifier()
    if event_data_identifier:
      lookup_key = event_data_identifier.CopyToString()
      event_data = self._event_data[lookup_key]

      for attribute_name, attribute_value in event_data.GetAttributes():
        setattr(event, attribute_name, attribute_value)
Reads the data into the event.

    This function is intended to offer backwards compatible event behavior.

    Args:
      event (EventObject): event.