工廠模式(2)

Demo場景：PizzaStore添加加盟店NYStylePizzaStore，PizzaStore需要控制Pizza製作流程，不控制具體Pizza的口味，加盟店NYStylePizzaStore可以修改Pizza。

相較於上一篇，這裏主要關注通過抽象工廠模式，解決不同原料的問題。

（1）總店還是作爲加盟店的基類：PizzaStore

package designpattern.factory.pizzaingredient;

public abstract class PizzaStore {

    public Pizza orderPizza(String type){
        Pizza pizza;

        pizza = createPizza(type);

        pizza.prepare();
        pizza.bake();
        pizza.cut();
        pizza.box();

        return pizza;
    }

    protected abstract Pizza createPizza(String type);
}

（2）Pizza原料工廠：PizzaIngredientFactory

package designpattern.factory.pizzaingredient;

public interface PizzaIngredientFactory {

    public Dough createDough();
    public Sauce createSauce();
    public Cheese createCheese();
    public Veggies[] createVeggies();
    public Pepperoni createPepperoni();
    public Clams createClam();
}

（3）具體的一種類型原料工廠：CheesePizza

package designpattern.factory.pizzaingredient;

public class CheesePizza extends Pizza {

    PizzaIngredientFactory ingredientFactory;

    public CheesePizza(PizzaIngredientFactory ingredientFactory){
        this.ingredientFactory = ingredientFactory;
    }

    @Override
    void prepare() {
        System.out.println("Preparing " + name);
        dough = ingredientFactory.createDough();
        sauce = ingredientFactory.createSauce();
        cheese = ingredientFactory.createCheese();
    }

}

（4）具體加盟店：NYPizzaStore

package designpattern.factory.pizzaingredient;

public class NYPizzaStore extends PizzaStore{

    @Override
    protected Pizza createPizza(String type) {
        Pizza pizza = null;
        PizzaIngredientFactory ingredientFactory = new NYPizzaIngredientFactory();
        if(type.equals("cheese")){
            pizza = new CheesePizza(ingredientFactory);
            pizza.setName("New York Style Cheese Pizza");
        }else if(type.equals("veggie")){
            pizza = new VeggiePizza(ingredientFactory);
            pizza.setName("New York Style Veggie Pizza");
        }else if(type.equals("clam")){
            pizza = new ClamPizza(ingredientFactory);
            pizza.setName("New York Style Clam Pizza");
        }else if(type.equals("pepperoni")){
            pizza = new PepperoniPizza(ingredientFactory);
            pizza.setName("New York Style Pepperoni Pizza");
        }
        return pizza;
    }

}

加盟店生產pizza演示：

package designpattern.factory.pizzaingredient;

public class PizzaTest {

    public static void main(String[] args) {
        PizzaStore pizzaStore = new NYPizzaStore();

        Pizza pizza = pizzaStore.orderPizza("cheese");
        System.out.println("A " + pizza.getName() + " had been ordered. ");
    }

}