protected internal override NSFEventStatus processEvent(NSFEvent nsfEvent)
{
NSFTransition elseTransition = null;
// Check transitions out of state
foreach (NSFTransition transition in outgoingTransitions)
{
if (!transition.Guards.isEmpty())
{
if (transition.processEvent(nsfEvent) == NSFEventStatus.NSFEventHandled)
{
return(NSFEventStatus.NSFEventHandled);
}
}
else
{
if (elseTransition != null)
{
// A choice is ill formed if it has more than one "else" transition
throw new Exception(Name + " invalid choice state with multiple else transitions");
}
elseTransition = transition;
}
}
if ((elseTransition != null) && (elseTransition.processEvent(nsfEvent) == NSFEventStatus.NSFEventHandled))
{
return(NSFEventStatus.NSFEventHandled);
}
// If no transition is taken, then the model is ill formed and an exception is thrown.
throw new Exception(Name + " invalid model with no transition taken from a choice state");
}
/// <summary>
/// Re-routes a transition between a specified source and destination
/// </summary>
/// <param name="transition">The transition to re-route.</param>
/// <param name="source">The new source for the transition.</param>
/// <param name="target">The new target for the transition.</param>
/// <remarks>
/// This method can be used when extending state machines.
/// Careful design consideration should be made before using this method.
/// Never change a state machines structure while it is running.
/// </remarks>
protected void rerouteTransition(NSFTransition transition, NSFState source, NSFState target)
{
transition.Source.removeOutgoingTransition(transition);
transition.Target.removeIncomingTransition(transition);
transition.Source = source;
transition.Target = target;
}
/// <summary>
/// Creates a state machine context.
/// </summary>
/// <param name="source">The state machine.</param>
/// <param name="enteringState">The state being entered.</param>
/// <param name="exitingState">The state being exited.</param>
/// <param name="transition">The associated transition.</param>
/// <param name="trigger">The triggering event.</param>
public NSFStateMachineContext(NSFStateMachine source, NSFState enteringState, NSFState exitingState, NSFTransition transition, NSFEvent trigger)
: base(source)
{
EnteringState = enteringState;
ExitingState = exitingState;
Transition = transition;
Trigger = trigger;
}
/// <summary>
/// Removes an outgoing transition.
/// </summary>
/// <param name="transition">The outgoing transition to remove.</param>
/// <remarks>
/// It is called when re-routing a transition.
/// </remarks>
internal void removeOutgoingTransition(NSFTransition transition)
{
outgoingTransitions.Remove(transition);
}
/// <summary>
/// Removes an incoming transition.
/// </summary>
/// <param name="transition">The incoming transition to remove.</param>
/// <remarks>
/// It is called when re-routing a transition.
/// </remarks>
internal void removeIncomingTransition(NSFTransition transition)
{
incomingTransitions.Remove(transition);
}
/// <summary>
/// Adds an incoming transition.
/// </summary>
/// <param name="transition">The incoming transition to add.</param>
/// <remarks>
/// This method is called from the base transition class constructor.
/// </remarks>
internal void addIncomingTransition(NSFTransition transition)
{
incomingTransitions.Add(transition);
}
/// <summary>
/// Re-routes a transition between a specified source and destination
/// </summary>
/// <param name="transition">The transition to re-route.</param>
/// <param name="source">The new source for the transition.</param>
/// <param name="target">The new target for the transition.</param>
/// <remarks>
/// This method can be used when extending state machines.
/// Careful design consideration should be made before using this method.
/// Never change a state machines structure while it is running.
/// </remarks>
protected void rerouteTransition(NSFTransition transition, NSFState source, NSFState target)
{
transition.Source.removeOutgoingTransition(transition);
transition.Target.removeIncomingTransition(transition);
transition.Source = source;
transition.Target = target;
}
/// <summary>
/// Creates a state machine context.
/// </summary>
/// <param name="source">The state machine.</param>
/// <param name="enteringState">The state being entered.</param>
/// <param name="exitingState">The state being exited.</param>
/// <param name="transition">The associated transition.</param>
/// <param name="trigger">The triggering event.</param>
public NSFStateMachineContext(NSFStateMachine source, NSFState enteringState, NSFState exitingState, NSFTransition transition, NSFEvent trigger)
: base(source)
{
EnteringState = enteringState;
ExitingState = exitingState;
Transition = transition;
Trigger = trigger;
}
/// <summary>
/// Removes an outgoing transition.
/// </summary>
/// <param name="transition">The outgoing transition to remove.</param>
/// <remarks>
/// It is called when re-routing a transition.
/// </remarks>
internal void removeOutgoingTransition(NSFTransition transition)
{
outgoingTransitions.Remove(transition);
}
/// <summary>
/// Removes an incoming transition.
/// </summary>
/// <param name="transition">The incoming transition to remove.</param>
/// <remarks>
/// It is called when re-routing a transition.
/// </remarks>
internal void removeIncomingTransition(NSFTransition transition)
{
incomingTransitions.Remove(transition);
}
/// <summary>
/// Adds an incoming transition.
/// </summary>
/// <param name="transition">The incoming transition to add.</param>
/// <remarks>
/// This method is called from the base transition class constructor.
/// </remarks>
internal void addIncomingTransition(NSFTransition transition)
{
incomingTransitions.Add(transition);
}