/// <summary>
/// Based on the event and current state to determine the next state
/// </summary>
/// <param name="systemEvent"></param>
/// <returns></returns>
internal SystemState GetNext(SystemStateEvent systemEvent)
{
var transition = new StateTransition<SystemState, SystemStateEvent>(_currentState, systemEvent);
SystemState nextState;
if (!Transitions.TryGetValue(transition, out nextState))
{
throw new SystemStateTransitionException(_currentState, systemEvent);
}
return nextState;
}
/// <summary>
/// Based on the event and current state to determine the next state
/// </summary>
/// <param name="systemEvent"></param>
/// <returns></returns>
internal SystemState GetNext(SystemStateEvent systemEvent)
{
var transition = new StateTransition <SystemState, SystemStateEvent>(_currentState, systemEvent);
SystemState nextState;
if (!Transitions.TryGetValue(transition, out nextState))
{
throw new SystemStateTransitionException(_currentState, systemEvent);
}
return(nextState);
}
/// <summary>
/// Move to next state based on the event given
/// </summary>
/// <param name="stateEvent"></param>
/// <returns></returns>
internal SystemState MoveNext(SystemStateEvent stateEvent)
{
_currentState = GetNext(stateEvent);
return(_currentState);
}
/// <summary>
/// Move to next state based on the event given
/// </summary>
/// <param name="stateEvent"></param>
/// <returns></returns>
internal SystemState MoveNext(SystemStateEvent stateEvent)
{
_currentState = GetNext(stateEvent);
return _currentState;
}
/// <summary>
/// Format a message
/// </summary>
/// <param name="systemState"></param>
/// <param name="stateEvent"></param>
/// <returns></returns>
private static string ExceptionMessage(SystemState systemState, SystemStateEvent stateEvent)
{
return(string.Format(CultureInfo.InvariantCulture, "Unexpected event {0} in state {1}.", stateEvent, systemState));
}
/// <summary>
/// Exception when error happens in system state transition
/// </summary>
/// <param name="systemState"></param>
/// <param name="stateEvent"></param>
internal SystemStateTransitionException(SystemState systemState, SystemStateEvent stateEvent)
: base(ExceptionMessage(systemState, stateEvent))
{
}
/// <summary>
/// Format a message
/// </summary>
/// <param name="systemState"></param>
/// <param name="stateEvent"></param>
/// <returns></returns>
private static string ExceptionMessage(SystemState systemState, SystemStateEvent stateEvent)
{
return string.Format(CultureInfo.InvariantCulture, "Unexpected event {0} in state {1}.", stateEvent, systemState);
}
/// <summary>
/// Exception when error happens in system state transition
/// </summary>
/// <param name="systemState"></param>
/// <param name="stateEvent"></param>
internal SystemStateTransitionException(SystemState systemState, SystemStateEvent stateEvent)
: base(ExceptionMessage(systemState, stateEvent))
{
}
