设计模式——建造者模式

       HeadFirst中并没有把建造者模式（生成器模式）当做常用的设计模式来讲解，只是在附录中一带而过。

       建造者模式的本质：
       分离了对象组件的单独构造（由Builder来负责）和装配（由Director）来负责。从而可以构建出复杂的对象。这个模式适用于：某个对象的构建
       过程复杂的情况先使用。由于实现了构建和装配的解耦。不同的构建器，相同的装配，也可以做出不同的对象相同的构建器不同的装配顺序也可以

       做出不同的对象。也就是实现了构建算法、装配算法的解耦，实现了更好的复用。

       Demo：

      

package com.wxisme.builder;

/**
 * 飞船
 * @author Administrator
 *
 */
public class AirShip {
	
	private OrbitalModule orbitalModule;  //轨道仓
	private Engine engine; //发动机
	private EscapeTower escapeTower;  //逃逸塔
	
	
	public void launch(){
		System.out.println("发射！");
	}
	
	
	
	public OrbitalModule getOrbitalModule() {
		return orbitalModule;
	}
	public void setOrbitalModule(OrbitalModule orbitalModule) {
		this.orbitalModule = orbitalModule;
	}
	public Engine getEngine() {
		return engine;
	}
	public void setEngine(Engine engine) {
		this.engine = engine;
	}
	public EscapeTower getEscapeTower() {
		return escapeTower;
	}
	public void setEscapeTower(EscapeTower escapeTower) {
		this.escapeTower = escapeTower;
	}
	
	
	
}

class OrbitalModule{
	private String name;

	public OrbitalModule(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
}

class Engine {
	private String name;

	public Engine(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	
}

class EscapeTower{
	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public EscapeTower(String name) {
		super();
		this.name = name;
	}
	
}





public interface AirShipBuilder {
	Engine builderEngine();
	OrbitalModule builderOrbitalModule();
	EscapeTower  builderEscapeTower();
}


public interface AirShipDirector {
	
	AirShip   directAirShip();
	
}



public class MyAirShipBuilder implements AirShipBuilder {

	//StringBuilder, 以后学习XML解析中，JDOM库中的类：DomBuilder,SaxBuilder
	@Override
	public Engine builderEngine() {
		System.out.println("构建发动机");
		return new Engine("MyEngine");
	}

	@Override
	public EscapeTower builderEscapeTower() {
		
		System.out.println("构建逃逸塔");
		return new EscapeTower("MyEscapeTower");
	}

	@Override
	public OrbitalModule builderOrbitalModule() {
		System.out.println("构建轨道仓");
		return new OrbitalModule("MyOrbitalModule");
	}	
	
}



public class MyAirshipDirector implements AirShipDirector {

	private AirShipBuilder builder;

	public MyAirshipDirector(AirShipBuilder builder) {
		this.builder = builder;
	}


	@Override
	public AirShip directAirShip() {
		Engine e = builder.builderEngine();
		OrbitalModule o = builder.builderOrbitalModule();
		EscapeTower et = builder.builderEscapeTower();
		
		//装配飞船对象
		AirShip ship = new AirShip();
		ship.setEngine(e);
		ship.setEscapeTower(et);
		ship.setOrbitalModule(o);
		
		return ship;
	}

}


public class Client {
	public static void main(String[] args) {
		
		AirShipDirector director = new MyAirshipDirector(new MyAirShipBuilder());

		AirShip ship = director.directAirShip();
		
		System.out.println(ship.getEngine().getName());
		
		ship.launch();
		
	}
}