/// <summary>
/// Fires the trigger towards this <see cref="IState"/>.
/// </summary>
/// <param name="trigger">The trigger as an instance of <see cref="EventMessage"/>.</param>
/// <returns>
/// The reference to the <see cref="IState"/> which has been reached after the transition.
/// </returns>
/// <exception cref="ArgumentNullException">Is thrown when <paramref name="trigger"/> is a <see langword="null"/> reference.</exception>
protected internal virtual IState ProcessTrigger(EventMessage trigger)
{
if (trigger == null)
{
throw new ArgumentNullException("trigger");
}
this.transitions[trigger.Name].PerformTransition(trigger);
return this.transitions[trigger.Name].ToState;
}
/// <summary>
/// Triggers the <see cref="IStateMachine"/> to handle the given <see cref="EventMessage"/> according to the actual <see cref="IState"/>.
/// </summary>
/// <param name="eventToHandle">The <see cref="EventMessage"/> to handle.</param>
/// <exception cref="ArgumentNullException">Is thrown when <paramref name="eventToHandle"/> is a <see langword="null"/> reference.</exception>
public void HandleEvent(EventMessage eventToHandle)
{
if (eventToHandle == null)
{
throw new ArgumentNullException("eventToHandle");
}
logger.DebugFormat("Handling event named {0} on state {1}", eventToHandle.Name, this.actualState.Name);
if (this.actualState.HasTransitionForTrigger(eventToHandle.Name))
{
IState target = this.actualState.ProcessTrigger(eventToHandle);
if (target.Name != this.actualState.Name)
{
this.actualState = (State)target;
}
}
else
{
logger.Info("No transitions defined for this trigger.");
}
}
