public void Undo()
{
switch (_previousSpeed)
{
case CeilingFanSpeed.High:
_ceilingFan.High();
break;
case CeilingFanSpeed.Medium:
_ceilingFan.Medium();
break;
case CeilingFanSpeed.Low:
_ceilingFan.Low();
break;
case CeilingFanSpeed.Off:
_ceilingFan.Off();
break;
}
}
public void Execute()
{
_previousSpeed = _ceilingFan.Speed;
_ceilingFan.Medium();
}