def valid(self):
"""Returns if this object is valid."""
if self.target_id is None or self.target_type is None or \
not EnumsAI.check_validity(self.target_id):
return False
if TargetType.TARGET_EMPIRE == self.target_type:
return self.target_id in fo.AllEmpireIDs()
else:
return self.target_obj is not None
