//Event handlers
protected void DoorOpened(object sender, EventArgs e)
{
switch (_doorControlStates)
{
//Door should be opening here
case DoorControlStates.DoorOpening:
//Change state
_doorControlStates = DoorControlStates.DoorClosing;
//Close door
_door.Close();
//End case
break;
//In case of breach where door is expected closed
case DoorControlStates.DoorClosed:
//Change state
_doorControlStates = DoorControlStates.DoorAlarm;
//Raise alarm
_alarm.Raise();
//End case
break;
}
}
protected void DoorClosed(object sender, EventArgs e)
{
switch (_doorControlStates)
{
case DoorControlStates.DoorClosing:
//Change state
_doorControlStates = DoorControlStates.DoorClosed;
//End case
break;
}
}
//Constructor
DoorControl(IAlarm alarm, IUserValidation userValidation, IEntryNotification entryNotification, IDoor door)
{
//Save reference to all dependencies
_alarm = alarm;
_userValidation = userValidation;
_entryNotification = entryNotification;
_door = door;
//Subscribe to all needed events
_door.DoorOpen += DoorOpened; //Event invoked when door is opened
_door.DoorClosed += DoorClosed; //Event invoked when door is closed
//Set initial state
_doorControlStates = DoorControlStates.DoorClosed;
}
public void RequestEntry(String id)
{
//Door is closed and ready for new request
switch (_doorControlStates)
{
case DoorControlStates.DoorClosed:
//Validate user
if (!_userValidation.ValidateEntryRequest(id))
{
return;
}
//Change state
_doorControlStates = DoorControlStates.DoorOpening;
//Open door
_door.Open();
//Notify user
_entryNotification.NotifyEntryGranted();
//End case
break;
//Alarm is currently active, userValidation disables alarm
case DoorControlStates.DoorAlarm:
//Validate user
if (!_userValidation.ValidateEntryRequest(id))
{
return;
}
//Change state
_doorControlStates = DoorControlStates.DoorClosed;
//Lower alarm
_alarm.Lower();
//End case
break;
}
}