#DP : Abstract Factory Pattern

Author: dhananjay-ng

.idea/workspace.xml

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+package designpatterns.creational.abstractfactory;
+
+
+public abstract class Car {
+    private CarType model;
+    private Location location;
+
+    public Car(CarType carType, Location location) {
+        this.model = carType;
+        this.location = location;
+
+    }
+
+    //each car subclass will construct car in different way
+    protected abstract void construct();
+
+    public CarType getModel() {
+        return model;
+    }
+
+    public void setModel(CarType model) {
+        this.model = model;
+    }
+
+    @Override
+    public String toString() {
+        return "Model- "+model + " built in "+location;
+    }
+
+}

src/main/java/designpatterns/creational/abstractfactory/Car.java

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+package designpatterns.creational.abstractfactory;
+
+public class CarFactory {
+    private CarFactory() {
+
+    }
+
+    public static Car buildCar(CarType carType) {
+        Car car;
+        Location location = Location.INDIA; // access location from some configuration.
+
+        switch (location) {
+
+            case INDIA:
+                car =  IndianCarFactory.buildCar(carType);
+                break;
+
+            case USA:
+                car =  USACarFactory.buildCar(carType);
+                break;
+
+            default:
+                car =  DefaultCarFactory.buildCar(carType);
+                break;
+        }
+        return car;
+    }
+}

src/main/java/designpatterns/creational/abstractfactory/CarFactory.java

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+package designpatterns.creational.abstractfactory;
+
+public enum CarType {
+    SMALL,
+    SEDAN,
+    LUXURY
+}

src/main/java/designpatterns/creational/abstractfactory/CarType.java

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+package designpatterns.creational.abstractfactory;
+
+public class DefaultCarFactory {
+    public static Car buildCar(CarType carType)
+    {
+        Car car = null;
+        switch (carType)
+        {
+            case SMALL:
+                car = new SmallCar(Location.DEFAULT);
+                break;
+
+            case SEDAN:
+                car = new SedanCar(Location.DEFAULT);
+                break;
+
+            case LUXURY:
+                car = new LuxuryCar(Location.DEFAULT);
+                break;
+
+            default:
+                //throw some exception
+                break;
+        }
+        return car;
+    }
+}

src/main/java/designpatterns/creational/abstractfactory/DefaultCarFactory.java

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+package designpatterns.creational.abstractfactory;
+
+public class IndianCarFactory {
+    public static Car buildCar(CarType carType) {
+        Car car = null;
+        switch (carType) {
+            case SMALL:
+                car = new SmallCar(Location.INDIA);
+                break;
+
+            case SEDAN:
+                car = new SedanCar(Location.INDIA);
+                break;
+
+            case LUXURY:
+                car = new LuxuryCar(Location.INDIA);
+                break;
+
+            default:
+                //throw some exception
+                break;
+        }
+        return car;
+    }
+}

src/main/java/designpatterns/creational/abstractfactory/IndianCarFactory.java

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+package designpatterns.creational.abstractfactory;
+
+public enum Location {
+    INDIA,
+    USA,
+    DEFAULT
+}

src/main/java/designpatterns/creational/abstractfactory/Location.java

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+package designpatterns.creational.abstractfactory;
+
+public class LuxuryCar extends Car {
+
+    public LuxuryCar(Location location) {
+        super(CarType.LUXURY, location);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building Luxury Car ..");
+
+    }
+}

src/main/java/designpatterns/creational/abstractfactory/LuxuryCar.java

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+package designpatterns.creational.abstractfactory;
+
+public class SedanCar extends Car {
+
+    SedanCar(Location location) {
+        super(CarType.SEDAN, location);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building sedan car..");
+        // add accessories
+    }
+}

src/main/java/designpatterns/creational/abstractfactory/SedanCar.java

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+package designpatterns.creational.abstractfactory;
+
+public class SmallCar extends Car {
+
+    SmallCar(Location location) {
+        super(CarType.SMALL, location);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building small car..");
+        // add accessories
+    }
+}