def get_assigned_object(self, object_type=None):
        """Return the current assigned object UUID.

        :param object_type: If it's specified, returns only if the PID
            object_type is the same, otherwise returns None. (default: None).
        :returns: The object UUID.
        """
        if object_type is not None:
            if self.object_type == object_type:
                return self.object_uuid
            else:
                return None
        return self.object_uuid