/* returns: >0 the intention was changed
* 1 = intention must continue running
* 2 = fail event was generated and added in C.E
* 3 = simply removed without event
*/
public override int DropDesire(Intention i, Trigger g, Reasoner rs, Unifier un)
{
if (i != null)
{
if (i.DropDesire(g, un))
{
//notify listener
if (rs.HasDesireListener())
{
foreach (Desire gl in rs.GetDesiresListeners())
{
gl.DesireFailed(g);
}
}
//generate failure event
Event failEvent = rs.FindEventForFailure(i, g); //find fail event for the goal just dropped
if (failEvent != null)
{
failEvent = new Event(failEvent.GetTrigger().Capply(un), failEvent.GetIntention());
rs.GetCircumstance().AddEvent(failEvent);
return(2);
}
else //i is finished or without failure plan
{
if (rs.HasDesireListener())
{
foreach (Desire gl in rs.GetDesiresListeners())
{
gl.DesireFinished(g, Desire.FinishStates.unachieved);
}
}
i.Fail(rs.GetCircumstance());
return(3);
}
}
}
return(0);
}