中介者模式
//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);
}
}