using System;
using System.Collections;

namespace template_visitor
{
	//----------------------------------------------------
	// "Visitor"
	abstract class Visitor
	{
		// Methods
		abstract public void Process( GoodsProto gp );
	}
	//----------------------------------------------------
	// "ConcreteVisitor1"
	class PrintInfoVisitor : Visitor
	{
		// Methods
		public override void Process( GoodsProto gp )
		{
			Goods g = ((Goods)gp);
  			Console.WriteLine( "Print Info  Visitor: "+
				"{0} has prise: {1:C}", 
				g.Title, g.Prise );
		}
	}
	//----------------------------------------------------
	// "ConcreteVisitor2"
	class RisePriseVisitor : Visitor
	{
		public override void Process( GoodsProto gp )
		{
			Goods g = ((Goods)gp);
			// Provide 3 extra vacation days
			g.Prise += 2.5;
			Console.WriteLine( "Rise  Prise Visitor: "+
				"{0}'s prise will be increased by: {1}", 
				g.Title, 2.5 );
		}
	}
	//----------------------------------------------------
	// "Element"
	abstract class GoodsProto
	{
		// Methods
		abstract public void Operate( Visitor visitor );
	}
	//---------------------------------------------------
	// "ConcreteElement"
	class Goods : GoodsProto
	{
		// Fields
		private string		m_title;
		private double		m_prise;
	        
		// Constructor
		public Goods( string title, double prise)
		{
			m_title = title;
			m_prise = prise;
		}
	
		public double Prise
		{
			get { return m_prise; }
			set { m_prise = value; }
		}
		public string Title
		{
			get { return m_title;  }
			set { m_title = value; }
		}
		// Methods
		public override void Operate( Visitor visitor )
		{
			visitor.Process( this );
		}
		
	}

	//-------------------------------------------------
	// "ObjectStructure" - The Goods manager
	class StoreHouse
	{
		public Hashtable m_goods = new Hashtable();

		// Indexers
		public GoodsProto this[ string name ]
		{
			get{ return (GoodsProto)m_goods[ name ]; }
			set{ m_goods.Add( name, value ); }
		}
		public void Operate( Visitor visitor )
		{
			foreach( Goods g in m_goods )
				g.Operate( visitor );
		}
	}
	//-------------------------------------------------
	/// 

	///   TemplateVisitorExample test
	/// 
	public class TemplateVisitorExample
	{
		public static void Main( string[] args )
		{
			// Goods storehouse collection
			StoreHouse h = new StoreHouse();
			// Initialize with standard goods
			h[ "mobile motorola" ] = 
				new Goods( "mobile motorola", 20.1);
			h[ "mobile nokia" ] = 
				new Goods( "mobile nokia", 17.2);


			// Goods within the storehouse are visited
			foreach (DictionaryEntry e in h.m_goods)
			{
				GoodsProto gp  = (GoodsProto) e.Value;
				gp.Operate(new PrintInfoVisitor());
				gp.Operate(new RisePriseVisitor());
				gp.Operate(new PrintInfoVisitor());
			}
		
			Console.Read();
		}
	}
}

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