中介模式-- 解决对象之间的交互依赖交织

Colleague.java    中含有中介者的抽象类

package com.godv.mediator;

//抽象的同事类     最终中介的就是其实现类的功能
public abstract class Colleague {
	private Mediator mediator;
	public String name;

	//强制子类构造器中包含Mediator 中介者的抽象类
	public Colleague(Mediator mediator, String name) {
		this.mediator = mediator;
		this.name = name;
	}

	public Mediator GetMediator() {
		return this.mediator;
	}

	//发送消息的抽象方法
	public abstract void SendMessage(int stateChange);
}

TV.java    /    CoffeeMachine.java    /    Alarm.java     /    CoffeeMachine.java

package com.godv.mediator;

//具体的同事类
public class Alarm extends Colleague {

	//构造器
	public Alarm(Mediator mediator, String name) {
		super(mediator, name);
		// TODO Auto-generated constructor stub
		//在创建Alarm 同事对象时，将自己放入到ConcreteMediator 对象中[集合]
		mediator.Register(name, this);
	}

	public void SendAlarm(int stateChange) {
		SendMessage(stateChange);
	}

	@Override
	public void SendMessage(int stateChange) {
		// TODO Auto-generated method stub
		//调用的中介者对象的getMessage
		this.GetMediator().GetMessage(stateChange, this.name);
	}

}

Mediator.java    中介类的抽象类

package com.godv.mediator;

//抽象中介类
public abstract class Mediator {
	//将给中介者对象，加入到集合中
	public abstract void Register(String colleagueName, Colleague colleague);

	//接收消息, 具体的同事对象发出
	public abstract void GetMessage(int stateChange, String colleagueName);

	public abstract void SendMessage();
}

ConcreteMediator.java    中介类的具体实现类    在这个类中完成对各个同事对象的协调调用

package com.godv.mediator;

import java.util.HashMap;

//具体的中介者类
public class ConcreteMediator extends Mediator {
	//集合，放入所有的同事对象
	private HashMap<String, Colleague> colleagueMap;
	private HashMap<String, String> interMap;

	public ConcreteMediator() {
		colleagueMap = new HashMap<String, Colleague>();
		interMap = new HashMap<String, String>();
	}

	@Override
	public void Register(String colleagueName, Colleague colleague) {
		// TODO Auto-generated method stub
		colleagueMap.put(colleagueName, colleague);

		// TODO Auto-generated method stub

		if (colleague instanceof Alarm) {
			interMap.put("Alarm", colleagueName);
		} else if (colleague instanceof CoffeeMachine) {
			interMap.put("CoffeeMachine", colleagueName);
		} else if (colleague instanceof TV) {
			interMap.put("TV", colleagueName);
		} else if (colleague instanceof Curtains) {
			interMap.put("Curtains", colleagueName);
		}

	}

	//具体中介者的核心方法
	//1. 根据得到消息，完成对应任务
	//2. 中介者在这个方法，协调各个具体的同事对象，完成任务
	@Override
	public void GetMessage(int stateChange, String colleagueName) {
		// TODO Auto-generated method stub

		//处理闹钟发出的消息
		if (colleagueMap.get(colleagueName) instanceof Alarm) {
			if (stateChange == 0) {
				((CoffeeMachine) (colleagueMap.get(interMap
						.get("CoffeeMacahine")))).StartCoffee();
				((TV) (colleagueMap.get(interMap.get("TV")))).StartTv();
				
				
			} else if (stateChange == 1) {
				((TV) (colleagueMap.get(interMap.get("TV")))).StopTv();
			}

		} else if (colleagueMap.get(colleagueName) instanceof CoffeeMachine) {
			((Curtains) (colleagueMap.get(interMap.get("Curtains"))))
					.UpCurtains();

		} else if (colleagueMap.get(colleagueName) instanceof TV) {//如果TV发现消息

		} else if (colleagueMap.get(colleagueName) instanceof Curtains) {
			//如果是以窗帘发出的消息，这里处理...
		}

	}

	@Override
	public void SendMessage() {
		// TODO Auto-generated method stub

	}

}

ClientTest.java

package com.godv.mediator;

public class ClientTest {

	public static void main(String[] args) {
		//创建一个中介者对象
		Mediator mediator = new ConcreteMediator();
		
		//创建Alarm 并且加入到  ConcreteMediator 对象的HashMap
		Alarm alarm = new Alarm(mediator, "alarm");
		
		//创建了CoffeeMachine 对象，并  且加入到  ConcreteMediator 对象的HashMap
		CoffeeMachine coffeeMachine = new CoffeeMachine(mediator,"coffeeMachine");
		
		//创建 Curtains , 并  且加入到  ConcreteMediator 对象的HashMap
		Curtains curtains = new Curtains(mediator, "curtains");
		TV tV = new TV(mediator, "TV");
		
		//让闹钟发出消息
		alarm.SendAlarm(0);
		coffeeMachine.FinishCoffee();
		alarm.SendAlarm(1);
	}

}

标签：mediator,--,交织,get,colleagueName,TV,colleagueMap,交互,public
来源： https://blog.csdn.net/we1less/article/details/112597371