private bool TryFindLocalHandler(TTrigger trigger, object[] args, out TriggerBehaviourResult handlerResult)
{
// Get list of candidate trigger handlers
if (!TriggerBehaviours.TryGetValue(trigger, out ICollection <TriggerBehaviour> possible))
{
handlerResult = null;
return(false);
}
// Guard functions are executed here
var actual = possible
.Select(h => new TriggerBehaviourResult(h, h.UnmetGuardConditions(args)))
.ToArray();
// Find a handler for the trigger
handlerResult = TryFindLocalHandlerResult(trigger, actual)
?? TryFindLocalHandlerResultWithUnmetGuardConditions(actual);
if (handlerResult == null)
{
return(false);
}
return(!handlerResult.UnmetGuardConditions.Any());
}
public void AddTriggerBehaviour(TriggerBehaviour triggerBehaviour)
{
if (!TriggerBehaviours.TryGetValue(triggerBehaviour.Trigger, out ICollection <TriggerBehaviour> allowed))
{
allowed = new List <TriggerBehaviour>();
TriggerBehaviours.Add(triggerBehaviour.Trigger, allowed);
}
allowed.Add(triggerBehaviour);
}
private bool TryFindLocalHandler(TTrigger trigger, out TriggerBehaviour handler, params Func <TriggerBehaviour, bool>[] filters)
{
ICollection <TriggerBehaviour> possible;
if (!TriggerBehaviours.TryGetValue(trigger, out possible))
{
handler = null;
return(false);
}
var actual = filters.Aggregate(possible, (current, filter) => current.Where(filter).ToArray());
if (actual.Count() > 1)
{
throw new InvalidOperationException(
string.Format(StateRepresentationResources.MultipleTransitionsPermitted,
trigger, UnderlyingState));
}
handler = actual.FirstOrDefault();
return(handler != null);
}