public void undo()
{
switch (_prevSpeed)
{
case CeilingFan.eSpeed.OFF:
_ceilingFan.Off();
break;
case CeilingFan.eSpeed.LOW:
_ceilingFan.Low();
break;
case CeilingFan.eSpeed.MEDIUM:
_ceilingFan.Medium();
break;
case CeilingFan.eSpeed.HIGH:
_ceilingFan.High();
break;
default:
break;
}
_prevSpeed = _ceilingFan.speed;
}
public void execute()
{
_prevSpeed = _ceilingFan.speed;
_ceilingFan.Medium();
}