Example - "Builder" design pattern in Java

Java, шаблоны проектирования, Builder

Example of "Builder" design pattern in Java

/* "Product" */
class Pizza {
    private String dough = "";
    private String sauce = "";
    private String topping = "";
 
    public void setDough(String dough) {
        this.dough = dough;
    }
 
    public void setSauce(String sauce) {
        this.sauce = sauce;
    }
 
    public void setTopping(String topping) {
        this.topping = topping;
    }
}
 
/* "Abstract Builder" */
abstract class PizzaBuilder {
    protected Pizza pizza;
 
    public Pizza getPizza() {
        return pizza;
    }
 
    public void createNewPizzaProduct() {
        pizza = new Pizza();
    }
 
    public abstract void buildDough();
    public abstract void buildSauce();
    public abstract void buildTopping();
}
 
/* "ConcreteBuilder" */
class HawaiianPizzaBuilder extends PizzaBuilder {
    public void buildDough() {
        pizza.setDough("cross");
    }
 
    public void buildSauce() {
        pizza.setSauce("mild");
    }
 
    public void buildTopping() {
        pizza.setTopping("ham+pineapple");
    }
}
 
/* "ConcreteBuilder" */
class SpicyPizzaBuilder extends PizzaBuilder {
    public void buildDough() {
        pizza.setDough("pan baked");
    }
 
    public void buildSauce() {
        pizza.setSauce("hot");
    }
 
    public void buildTopping() {
        pizza.setTopping("pepperoni+salami");
    }
}
 
/* "Director" */
class Waiter {
    private PizzaBuilder pizzaBuilder;
 
    public void setPizzaBuilder(PizzaBuilder pb) {
        pizzaBuilder = pb;
    }
 
    public Pizza getPizza() {
        return pizzaBuilder.getPizza();
    }
 
    public void constructPizza() {
        pizzaBuilder.createNewPizzaProduct();
        pizzaBuilder.buildDough();
        pizzaBuilder.buildSauce();
        pizzaBuilder.buildTopping();
    }
}
 
/* A customer ordering a pizza. */
public class PizzaBuilderDemo {
    public static void main(String[] args) {
        Waiter waiter = new Waiter();
        PizzaBuilder hawaiianPizzabuilder = new HawaiianPizzaBuilder();
        PizzaBuilder spicyPizzaBuilder = new SpicyPizzaBuilder();
 
        waiter.setPizzaBuilder( hawaiianPizzabuilder );
        waiter.constructPizza();
 
        Pizza pizza = waiter.getPizza();
    }
}