class1.cs

《深入浅出设计模式》的完整源代码

using System;
using System.Collections;
//中介者接口
interface IChatroom
{
	void Register( Participant participant );
	void Send( string from, string to, string message );
}
//具体中介者-聊天室类
class Chatroom : IChatroom
{
	//参与者
	private Hashtable participants = new Hashtable();
	//先注册参与者
	public void Register( Participant participant )
	{
		if( participants[ participant.Name ] == null )
			participants[ participant.Name ] = participant;

		participant.Chatroom = this;
	}
    //发送信息
	public void Send( string from, string to, string message )
	{
		Participant pto = (Participant)participants[ to ];
		if( pto != null )
			pto.Receive( from, message );
	}
}
//（同事）参与者基类
class Participant
{
	private Chatroom chatroom;
	private string name;
	//构造函数始初化名称
	public Participant( string name )
	{
		this.name = name;
	}
	public string Name
	{
		get{ return name; }
	}
	//具有聊天室属性
	public Chatroom Chatroom
	{
		set{ chatroom = value; }
		get{ return chatroom; }
	}
	//发送信息，调用聊天类的发送方法
	public void Send( string to, string message )
	{
		chatroom.Send( name, to, message );
	}
   //虚拟接收函数
	virtual public void Receive(
		string from, string message )
	{
		Console.WriteLine( "{0} to {1}: '{2}'",
			from, this.name, message );
	}
}

//具体同事类-Beatle参与者(有个乐队组合叫Beatles)

class BeatleParticipant : Participant
{
	// Constructors
	public BeatleParticipant( string name )
		: base ( name ) { }

	override public void Receive(
		string from, string message )
	{
		Console.Write( "To a Beatle: " );
		base.Receive( from, message );
	}
}
//具体同事类-非Beatle参与者
class NonBeatleParticipant : Participant
{
	//调用基类的构造函数
	public NonBeatleParticipant( string name )
		: base ( name ) { }
	override public void Receive(
		string from, string message )
	{
		Console.Write( "To a non-Beatle: " );
		base.Receive( from, message );
	}
}
/// <summary>
/// 中介者模式测试程序
/// </summary>
public class MediatorApp
{
	public static void Main(string[] args)
	{
		//创建聊天室
		Chatroom c = new Chatroom();
		//创造参与者及登记入聊天室
		Participant George = new BeatleParticipant("George");
		Participant Paul = new BeatleParticipant("Paul");
		Participant Ringo = new BeatleParticipant("Ringo");
		Participant John = new BeatleParticipant("John") ;
		Participant Yoko = new NonBeatleParticipant("Yoko");
		c.Register( George );
		c.Register( Paul );
		c.Register( Ringo );
		c.Register( John );
		c.Register( Yoko );
		//成员间聊天
		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" ) ;
		Console.Read();
	}
}