//中介者模式
//CopyRight(C) CAnca software Office.2006
//Created by CAnca.

public class MediatorMode{
 public static void main(String[] args){
  Mediator mediator = new ConcreteMediator();
  Colleague coleague1 = new ConcreteColleagueA(mediator);
  Colleague coleague2 = new ConcreteColleagueB(mediator);
  mediator.setColleagueA(coleague1);
  mediator.setColleagueB(coleague2);
  coleague1.send("Hello.How are you!");
  coleague2.send("I'm fine.Thank you!");
 }
}

//Mediator
abstract class Mediator{
 abstract void send(String message,Colleague colleague);
 abstract void setColleagueA(Colleague colleague);
 abstract void setColleagueB(Colleague colleague);
}

class ConcreteMediator extends Mediator{
 private Colleague colleagueA,colleagueB;
 
 public void setColleagueA(Colleague colleague){
  this.colleagueA = colleague;
 } 
 
 public void setColleagueB(Colleague colleague){
  this.colleagueB = colleague;
 }
 
 public void send(String message,Colleague colleague){
  if(colleague == colleagueA){
   colleagueB.notify(message);
  }else{
   colleagueA.notify(message);
  }
 }
}

abstract class Colleague{
 protected Mediator mediator;
 public Colleague(Mediator mediator){
  this.mediator = mediator;
 }
 
 abstract void send(String str);
 abstract void notify(String str);
}

class ConcreteColleagueA extends Colleague{
 public ConcreteColleagueA(Mediator mediator){
  super(mediator);
 }
 
 public void send(String str){
  this.mediator.send(str,this);
 }
 
 public void notify(String str){
  System.out.println("ConcreteColleagueA.send() - " + str);
 }
}

class ConcreteColleagueB extends Colleague{
 public ConcreteColleagueB(Mediator mediator){
  super(mediator);
 }
 public void send(String str){
  this.mediator.send(str,this);
 }
 public void notify(String str){
  System.out.println("ConcreteColleagueB.send() - " + str);
 }
}

---

//中介者模式--现实例子
//CopyRight(C) CAnca software Office.2006
//Created by CAnca.

import java.util.*;
  
  // MainApp test application 
 
public class MediatorMode_RealWorld{
 public static void main(String[] args){
      // Create chatroom 
      Chatroom chatroom = new Chatroom();
      // Create participants and register them 
      Participant George = new Beatle("George");
      Participant Paul = new Beatle("Paul");
      Participant Ringo = new Beatle("Ringo");
      Participant John = new Beatle("John") ;
      Participant Yoko = new NonBeatle("Yoko");
 
      chatroom.Register(George);
      chatroom.Register(Paul);
      chatroom.Register(Ringo);
      chatroom.Register(John);
      chatroom.Register(Yoko);
 
      // Chatting participants 
      Yoko.Send ("John", "Hi John!");
      Paul.Send ("Ringo", "All you need is love");
      Ringo.Send("George", "My sweet Lord");
      Paul.Send ("John", "Can't buy me love");
      John.Send ("Yoko", "My sweet love");
    }
  }
 
  // "Mediator" 
 
  abstract class AbstractChatroom
  {
    abstract void Register(Participant participant);
    abstract void Send(String from, String to, String message);
  }
 
  // "ConcreteMediator" 
 
  class Chatroom extends AbstractChatroom
  {
    private Hashtable participants = new Hashtable();
 
    public void Register(Participant participant)
    {
      if (participants.get(participant.getName()) == null)
      {
       participants.put(participant.getName(),participant);
      }
 
      participant.setChatroom(this);
    }
 
    public void Send(String from, String to, String message)
    {
      Participant pto = (Participant)participants.get(to);
      if (pto != null)
      {
        pto.Receive(from, message);
      }
    }
  }
 
  // "AbstractColleague" 
 
  class Participant
  {
    private Chatroom chatroom;
    private String name;
 
    // Constructor 
    public Participant(String name)
    {
      this.name = name;
    }
 
    // Properties 
    public String getName()
    {
      return name;
    }
 
    public Chatroom getChatroom()
    { 
      return chatroom;
    }
   
    public void setChatroom(Chatroom chatroom){
     this.chatroom = chatroom;
    }
 
    public void Send(String to, String message)
    {
      chatroom.Send(name, to, message);
    }
 
    public void Receive(String from, String message)
    {
      System.out.println(from + " to " + getName() + " : '" + message + "'");
    }
  }
 
  //" ConcreteColleague1" 
 
  class Beatle extends Participant
  {
    // Constructor 
    public Beatle(String name)
    {
     super(name);
    }
 
    public void Receive(String from, String message)
    {
      System.out.print("To a Beatle: ");
      super.Receive(from, message);
    }
  }
 
  //" ConcreteColleague2" 
 
  class NonBeatle extends Participant
  {
    // Constructor 
    public NonBeatle(String name)
    {
     super(name);
    }
 
    public void Receive(String from, String message)
    {
      System.out.print("To a non-Beatle: ");
      super.Receive(from, message);
    }
  }