public static FactoryFinder getInstance()
{
if (theInstance == null)
{
theInstance = new FactoryFinder();
}
return(theInstance);
}
public static void install()
{
var finder = FactoryFinder.getInstance();
var dieselFactory = new DieselFactory();
var hybridFactory = new HybridFactory();
var hybridicFactory = new HybridicFactory();
var electricFactory = new ElectricFactory();
finder.registerFactory(InterfaceID.ID_Diesel, dieselFactory);
finder.registerFactory(InterfaceID.ID_Electric, electricFactory);
finder.registerFactory(InterfaceID.ID_Hybrid, hybridFactory);
finder.registerFactory(InterfaceID.ID_Hybridic, hybridicFactory);
}
public static void Main(string[] args)
{
// Register car factories with factory finder
CarInstaller.install();
// Access factory finder
var finder = FactoryFinder.getInstance();
try
{
IFactory factory = null;
IDiesel dCar = null;
IElectric eCar = null;
IHybrid hCar = null;
factory = finder.findFactory(InterfaceID.ID_Diesel);
dCar = (IDiesel)factory.create();
dCar.fuel();
factory = finder.findFactory(InterfaceID.ID_Electric);
eCar = (IElectric)factory.create();
eCar.charge();
factory = finder.findFactory(InterfaceID.ID_Hybrid);
dCar = (IDiesel)factory.create();
dCar.fuel();
eCar = (IElectric)dCar.getExtension(InterfaceID.ID_Electric);
eCar.charge();
factory = finder.findFactory(InterfaceID.ID_Hybridic);
hCar = (IHybrid)factory.create();
hCar.fuel();
hCar.charge();
// oder mit Rollenwechsel
ICar car = null;
factory = finder.findFactory(InterfaceID.ID_Hybrid); // supports only IDiesel und IElectric
car = factory.create();
((IDiesel)car).fuel();
((IElectric)car).charge();
car = car.getExtension(InterfaceID.ID_Diesel); // Role ID_Diesel
((IDiesel)car).fuel();
car = car.getExtension(InterfaceID.ID_Electric); // Role ID_Electric
((IElectric)car).charge();
// car = car.getExtension(InterfaceID.ID_Hybrid); // UnknownExtensionException: IHybrid not supported
// ((IDiesel) car).fuel();
// ((IElectric) car).charge();
// car = car.getExtension(InterfaceID.ID_Hybridic); // UnknownExtensionException: IHybridic not supported
// ((IHybrid) car).fuel();
// ((IHybrid) car).charge();
/* Result
*
* Filled up with Diesel
* Charged with Electricity
* Filled up with Diesel
* Charged with Electricity
* Filled up with Diesel
* Charged with Electricity
* Filled up with Diesel
* Charged with Electricity
* Filled up with Diesel
* Charged with Electricity
*
*/
}
catch (UnknownExtensionException ex)
{
Console.WriteLine(ex);
throw;
}
}
