How do you make a Factory that can return derived types?
- by Seth Spearman
I have created a factory class called AlarmFactory as such...
1 class AlarmFactory
2 {
3 public static Alarm GetAlarm(AlarmTypes alarmType) //factory ensures that correct alarm is returned and right func pointer for trigger creator.
4 {
5 switch (alarmType)
6 {
7 case AlarmTypes.Heartbeat:
8 HeartbeatAlarm alarm = HeartbeatAlarm.GetAlarm();
9 alarm.CreateTriggerFunction = QuartzAlarmScheduler.CreateMinutelyTrigger;
10 return alarm;
11
12 break;
13 default:
14
15 break;
16 }
17 }
18 }
Heartbeat alarm is derived from Alarm. I am getting a compile error "cannot implicitly convert type...An explicit conversion exists (are you missing a cast?)". How do I set this up to return a derived type?
Seth
