니젤프림/Builder Pattern

/** "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. */
class BuilderExample {
  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();
  }
}

// PlanComponent
package nijel.product;

public class PlanComponent {	
	protected String name;
	protected String description;

	public PlanComponent(String name, String description) {
		this.name = name;
		this.description = description;
	}
	
	public void add(PlanComponent planComponent) {
		throw new UnsupportedOperationException();
	}
	
	public void remove(PlanComponent planComponent) {
		throw new UnsupportedOperationException();
	}
	public PlanComponent getChild(int index) {
		throw new UnsupportedOperationException();
	}
	
	public String getName() {
		throw new UnsupportedOperationException();
	}
	
	public String getDescription() {
		throw new UnsupportedOperationException();
	}
	
	public void print() {
		throw new UnsupportedOperationException();
	}
}

// Plan
package nijel.product;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Plan extends PlanComponent {
	private List<PlanComponent> planComponents;

	public String getName() {
		return name;
	}
	
	public String getDescription() {
		return description;
	}
	
	public Plan(String name, String description) {
		super(name, description);
		
		planComponents = new ArrayList<PlanComponent>();
	}

	public void add(PlanComponent planComponent) {
		planComponents.add(planComponent);
	}

	public PlanComponent getChild(int index) {
		return planComponents.get(index);
	}

	public void remove(PlanComponent planComponent) {
		planComponents.remove(planComponent);
	}
	
	public void print() {
		System.out.println("\n" + getName());
		System.out.println(", " + getDescription());
		System.out.println("------------------------------");
		
		Iterator iterator = planComponents.iterator();
		while (iterator.hasNext()) {
			PlanComponent planComponent = (PlanComponent) iterator.next();
			planComponent.print();
		}
	}
}

// PlanItem
package nijel.product;

public class PlanItem extends PlanComponent {
	
	public PlanItem(String name, String description) {
		super(name, description);
	}
	
	public String getName() {
		return name;
	}
	
	public String getDescription() {
		return description;
	}
	
	public void print() {
		System.out.println("\t" + getName() + "\n");
		System.out.println("\t\t" + getDescription() + "\n");
	}
}

// director
package nijel.builder;

import nijel.product.PlanComponent;

public abstract class Planner {
	abstract public PlanComponent makePlan();
}

// concrete director
package nijel.builder;

import nijel.product.PlanComponent;

public class MyPlanner extends Planner {
	
	private Builder builder;

	public MyPlanner(Builder builder) {
		this.builder = builder;
	}
	
	public PlanComponent makePlan() {
		int first, second, third;
		
		first = 1;
		builder.buildDay(first);
		
		builder.addHotel(first, "Patternsland 5 star Hotel");
		builder.addTickets(first, "Park Ticket: R");
		builder.addReservation(first, "Dinner at VERY expensive French restaurant");
		
		second = 2;
		builder.buildDay(second);
		
		builder.addHotel(second, "Maybe Hotel");
		builder.addTickets(second, "Park Ticket: A");
		builder.addSpecialEvent(second, "Patterns on Ice");
		builder.addReservation(second, "just dinner");
		
		third = 3;
		builder.buildDay(third);
		builder.addHotel(third, "Wannabe Hotel");
		builder.addTickets(third, "Ticket for Children!");
		
		return builder.getVacationPlan();
	}
}

// builder
package nijel.builder;

import nijel.product.PlanComponent;

public interface Builder {
	abstract public void buildDay(int date);
	abstract public void addHotel(int date, String hotel);
	abstract public void addTickets(int date, String ticket);
	abstract public void addSpecialEvent(int date, String event);
	abstract public void addReservation(int date, String restaurant);
	
	abstract public PlanComponent getVacationPlan();
}

// concrete builder
package nijel.builder;

import nijel.product.Plan;
import nijel.product.PlanComponent;
import nijel.product.PlanItem;

public class VacationBuilder implements Builder {
	private PlanComponent plan;
	
	public VacationBuilder(String description) {
		plan = new Plan(description);
	}
	
	public void addHotel(int date, String hotel) {
		PlanComponent hotelReservation = new PlanItem(hotel);
		
		plan.getChild(date - 1).add(hotelReservation);
	}

	public void addSpecialEvent(int date, String event) {
		PlanComponent specialEvent = new Plan("Special Event");
		specialEvent.add(new PlanItem(event));
		
		plan.getChild(date - 1).add(specialEvent);
	}

	public void addTickets(int date, String ticket) {
		PlanComponent admissionTicket = new PlanItem(ticket);
		
		plan.getChild(date - 1).add(admissionTicket);
	}

	public void buildDay(int date) {
		plan.add(new Plan(date + "day's plan"));
	}

	public PlanComponent getVacationPlan() {
		return plan;
	}

	public void addReservation(int date, String restaurant) {
		PlanComponent reservation = new Plan("Dining");
		reservation.add(new PlanItem(restaurant));
		
		plan.getChild(date - 1).add(reservation);
		
	}
}

package nijel.client;

import nijel.builder.*;
import nijel.product.*;

public class Client {
	public static void main(String[] args) {
		PlanComponent perfectVacationPlan;
		Planner perfectPlanner =
					new MyPlanner(new VacationBuilder("Perfect Vacation Plan"));
		
		perfectVacationPlan = perfectPlanner.makePlan();
		
		perfectVacationPlan.print();
	}
}