Sunday, 5 January 2014

Decorator Design pattern - Implementation [Car]



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Decorator Design pattern - Implementation [Car]


Decorator Design pattern - Implementation [Car] - Class Diagram

















Car.java

public interface Car
{
public Car manufactureCar();
}

BMWCar.java

public class BMWCar implements Car
{

private final String CARNAME = "BMW";
private String       carBody;
private String       carDoor;
private String       carWheels;
private String       carGlass;
private String       engine;

public String getCarBody()
{
return carBody;
}

public void setCarBody( String carBody )
{
this.carBody = carBody;
}

public String getCarDoor()
{
return carDoor;
}

public void setCarDoor( String carDoor )
{
this.carDoor = carDoor;
}

public String getCarWheels()
{
return carWheels;
}

public void setCarWheels( String carWheels )
{
this.carWheels = carWheels;
}

public String getCarGlass()
{
return carGlass;
}

public void setCarGlass( String carGlass )
{
this.carGlass = carGlass;
}

public String getCARNAME()
{
return CARNAME;
}

public String getEngine()
{
return engine;
}

public void setEngine( String engine )
{
this.engine = engine;
}

@Override
public String toString()
{
return "BMWCar [CARNAME=" + CARNAME + ", carBody=" + carBody + ", carDoor=" + carDoor + ", carWheels="
               + carWheels + ", carGlass=" + carGlass + ", engine=" + engine + "]";
}

@Override
public Car manufactureCar()
{
this.carBody = "carbon fiber material";
this.carDoor = "4 car doors";
this.carGlass = "6 car glasses";
this.carWheels = "4 MRF wheels";
return this;
}
}

CarDecorator.java

public abstract class CarDecorator implements Car
{
Car car;

public CarDecorator( Car car )
{
super();
this.car = car;
}

public Car manufactureCar()
{
return car.manufactureCar();
}
}

DieselCarDecorator.java

public class DieselCarDecorator extends CarDecorator
{

public DieselCarDecorator( Car car )
{
super(car);

}

public Car manufactureCar()
{
car.manufactureCar();
addEngine(car);
return car;
}

public void addEngine( Car car )
{
if( car instanceof BMWCar )
{
BMWCar BMWCar = (BMWCar) car;
BMWCar.setEngine("Diesel Engine");
System.out.println("DieselCarDecorator added Diesel Engine to the Car : " + car);
}

}
}

PetrolCarDecorator.java

public class PetrolCarDecorator extends CarDecorator
{

public PetrolCarDecorator( Car car )
{
super(car);
}
public Car manufactureCar()
{
car.manufactureCar();
addEngine(car);
return car;
}

public void addEngine( Car car )
{
if( car instanceof BMWCar )
{
BMWCar BMWCar = (BMWCar) car;
BMWCar.setEngine("Petrol Engine");
System.out.println("PetrolEngineDecorator added Petrol Engine to the Car : " + car);
}

}
}

DecoratorClient.java

public class DecoratorClient
{

public static void main( String[] args )
{
Car bmwCar1 = new BMWCar();
System.out.println(bmwCar1+"\n");

DieselCarDecorator carWithDieselEngine = new DieselCarDecorator(bmwCar1);
carWithDieselEngine.manufactureCar();

System.out.println("\n*******************************************************");

Car bmwCar2 = new BMWCar();

PetrolCarDecorator carWithPetrolEngine = new PetrolCarDecorator(bmwCar2);
carWithPetrolEngine.manufactureCar();

}
}

Output

BMWCar [CARNAME=BMW, carBody=null, carDoor=null, carWheels=null, carGlass=null, engine=null]

DieselCarDecorator added Diesel Engine to the Car : BMWCar [CARNAME=BMW, carBody=carbon fiber material, carDoor=4 car doors, carWheels=4 MRF wheels, carGlass=6 car glasses, engine=Diesel Engine]

*******************************************************
PetrolEngineDecorator added Petrol Engine to the Car : BMWCar [CARNAME=BMW, carBody=carbon fiber material, carDoor=4 car doors, carWheels=4 MRF wheels, carGlass=6 car glasses, engine=Petrol Engine]


See also:

  • Decorator Design pattern - Introduction
  • Decorator Design pattern - Real Time Example [Dosa]
  • Decorator Design pattern - Real Time Example [Ice Cream]
  • Decorator Design pattern - Real Time Example [Pizza]
  • Decorator Design pattern - Real Time Example [Car]
  • Decorator Design pattern - Class Diagram
  • Decorator Design pattern - Sequence Diagram
  • Decorator Design pattern - Implementation [Dosa]
  • Decorator Design pattern - Implementation [Pizza]
  • Decorator Design pattern - Implementation [Ice Cream]
  • Decorator Design pattern - Implementation [Shape]
  • Decorator Design pattern - Key Points
  • All Design Patterns Links
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