/// <summary>
/// Throws an exception if the specified transition is already defined on this state.
/// </summary>
/// <param name="transitionDefinition">The transition.</param>
private void CheckTransitionDoesNotYetExist(TransitionDefinition <TState, TEvent> transitionDefinition)
{
if (transitionDefinition.Source != null)
{
throw new InvalidOperationException(TransitionsExceptionMessages.TransitionDoesAlreadyExist(transitionDefinition, this.state));
}
}
/// <summary>
/// Adds the specified event id.
/// </summary>
/// <param name="eventId">The event id.</param>
/// <param name="transitionDefinition">The transition.</param>
public void Add(TEvent eventId, TransitionDefinition <TState, TEvent> transitionDefinition)
{
Guard.AgainstNullArgument("transition", transitionDefinition);
this.CheckTransitionDoesNotYetExist(transitionDefinition);
transitionDefinition.Source = this.state;
this.MakeSureEventExistsInTransitionList(eventId);
this.transitions[eventId].Add(transitionDefinition);
}