public void Undo()
{
switch (Previous)
{
case CeilingFanSpeed.Off:
_ceilingFan.Off();
break;
case CeilingFanSpeed.High:
_ceilingFan.High();
break;
case CeilingFanSpeed.Low:
_ceilingFan.Low();
break;
case CeilingFanSpeed.Medium:
_ceilingFan.Medium();
break;
default:
throw new NotImplementedException("Um....");
}
}
public override void Execute()
{
Previous = _ceilingFan.FanSpeed;
_ceilingFan.High();
}