using System;
using System.Collections;

namespace design_pattern_mediator
{

	// "Mediator"
	class Mediator
	{
		// Fields
		private Hashtable m_plugins = new Hashtable();
		static Mediator  m_mediator = null;

		// Methods
		private Mediator() {}
		public static Mediator GetMediator()
		{
			if (m_mediator == null)
				m_mediator = new Mediator();
			return m_mediator;
		}
		public void AddPlugin( Plugin plugin )
		{
			if( m_plugins[ plugin.Name ] == null )
				m_plugins[ plugin.Name ] = plugin;
			plugin.Mediator = m_mediator;
		}

		public void SendMessage( string from, 
                              string to, string message )
		{
			Plugin p = (Plugin)m_plugins[ to ];
			if( p != null )
				p.Receive( from, message );
		}
	}

	// "Abstract Colleague"
	interface IPlugin
	{
		void Send(string to, string msg);
		void Receive(string from, string msg);
	}

	// "Concrete Colleague"
	class Plugin 
	{
		// Fields
		private Mediator m_mediator;
		private string name;

		// Constructors
		public Plugin( string name )
		{
			this.name = name;
		}

		// Properties
		public string Name
		{
			get{ return name; }
		}

		public Mediator Mediator
		{
			set{ m_mediator = value; }
			get{ return m_mediator; }
		}

		// Methods
		public void Send( string to, string message )
		{
			Mediator.SendMessage( name, to, message );
		}

		virtual public void Receive( 
			string from, string message )
		{
			Console.WriteLine( "{0} to {1}: '{2}'",
				from, this.name, message );
		}
	}

	/// 

	///   MediatorApp test
	/// 
	public class MediatorApp
	{
		public static void Main(string[] args)
		{
			// Create mediator
			Mediator m = Mediator.GetMediator();

			// Create plugins and register them
			Plugin Plugin1 = new Plugin("Plugin 1");
			Plugin Plugin2 = new Plugin("Plugin 2");

			m.AddPlugin( Plugin1 );
			m.AddPlugin( Plugin2 );

			// Messages exchanging
			Plugin1.Send( "Plugin 2",
                "Message from Plugin 1 to Plugin 2" );
			Plugin2.Send( "Plugin 1",
                "Message from Plugin 2 to Plugin 1" );

			Console.Read();

		}
	}
}

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