工厂模式&抽象工厂——HeadFirst设计模式学习笔记

 1 public class SimplePizzaFactory {
 2     public Pizza createPizza(String type) {
 3         Pizza pizza = null;
 4 
 5         if (type.equals("cheese")) {
 6             pizza = new CheesePizza();
 7         } else if (type.equals("pepperoni")) {
 8             pizza = new PepperoniPizza();
 9         } else if (type.equals("clam")) {
10             pizza = new ClamPizza();
11         } else if (type.equals("veggie")) {
12             pizza = new VeggiePizza();
13         }
14         return pizza;
15     }
16 }

 1 public abstract class PizzaStore {
 2  
 3     //这里定义一个工厂方法
 4     abstract Pizza createPizza(String item);
 5  
 6     public Pizza orderPizza(String type) {
 7     
 8         Pizza pizza = createPizza(type);
 9         
10         System.out.println("--- Making a " + pizza.getName() + " ---");
11         pizza.prepare();
12         pizza.bake();
13         pizza.cut();
14         pizza.box();
15         
16         return pizza;
17     }
18 }

 1 public class ChicagoPizzaStore extends PizzaStore {
 2 
 3     Pizza createPizza(String item) {
 4             if (item.equals("cheese")) {
 5                     return new ChicagoStyleCheesePizza();
 6             } else if (item.equals("veggie")) {
 7                     return new ChicagoStyleVeggiePizza();
 8             } else if (item.equals("clam")) {
 9                     return new ChicagoStyleClamPizza();
10             } else if (item.equals("pepperoni")) {
11                     return new ChicagoStylePepperoniPizza();
12             } else return null;
13     }
14 }

 1 public class PizzaTestDrive {
 2  
 3     public static void main(String[] args) {
 4         PizzaStore nyStore = new NYPizzaStore();
 5  
 6         Pizza pizza = nyStore.orderPizza("cheese");
 7         System.out.println("Ethan ordered a " + pizza.getName() + "\n");
 8 
 9         pizza = nyStore.orderPizza("clam");
10         System.out.println("Ethan ordered a " + pizza.getName() + "\n");
11     }
12 }

 1 public interface PizzaIngredientFactory {
 2  
 3     public Dough createDough();
 4     public Sauce createSauce();
 5     public Cheese createCheese();
 6     public Veggies[] createVeggies();
 7     public Pepperoni createPepperoni();
 8     public Clams createClam();
 9  
10 }

 1 public class NYPizzaIngredientFactory implements PizzaIngredientFactory {
 2  
 3     public Dough createDough() {
 4         return new ThinCrustDough();
 5     }
 6  
 7     public Sauce createSauce() {
 8         return new MarinaraSauce();
 9     }
10  
11     public Cheese createCheese() {
12         return new ReggianoCheese();
13     }
14  
15     public Veggies[] createVeggies() {
16         Veggies veggies[] = { new Garlic(), new Onion(), new Mushroom(), new RedPepper() };
17         return veggies;
18     }
19  
20     public Pepperoni createPepperoni() {
21         return new SlicedPepperoni();
22     }
23 
24     public Clams createClam() {
25         return new FreshClams();
26     }
27 }

 1 public class CheesePizza extends Pizza {
 2     //这里组合了一个PizzaIngredientFactory对象的引用，用于提供不同的原料
 3     PizzaIngredientFactory ingredientFactory;
 4  
 5     /**
 6      * 通过传入一个PizzaIngredientFactory原料工厂，我们可以在制作Pizza的时候动态的产生所需要的原料
 7      * @param ingredientFactory
 8      */
 9     
10     public CheesePizza(PizzaIngredientFactory ingredientFactory) {
11         this.ingredientFactory = ingredientFactory;
12     }
13  
14     void prepare() {
15         System.out.println("Preparing " + name);
16         dough = ingredientFactory.createDough();
17         sauce = ingredientFactory.createSauce();
18         cheese = ingredientFactory.createCheese();
19     }
20 }

 1 public class NYPizzaStore extends PizzaStore {
 2  
 3     protected Pizza createPizza(String item) {
 4         Pizza pizza = null;
 5         PizzaIngredientFactory ingredientFactory = new NYPizzaIngredientFactory();
 6  
 7         if (item.equals("cheese")) {
 8   
 9             pizza = new CheesePizza(ingredientFactory);
10             pizza.setName("New York Style Cheese Pizza");
11   
12         } else if (item.equals("veggie")) {
13  
14             pizza = new VeggiePizza(ingredientFactory);
15             pizza.setName("New York Style Veggie Pizza");
16  
17         } else if (item.equals("clam")) {
18  
19             pizza = new ClamPizza(ingredientFactory);
20             pizza.setName("New York Style Clam Pizza");
21  
22         } else if (item.equals("pepperoni")) {
23 
24             pizza = new PepperoniPizza(ingredientFactory);
25             pizza.setName("New York Style Pepperoni Pizza");
26  
27         } 
28         return pizza;
29     }
30 }