Another way of polymorphism

/*
Copyright (c) 2005 by vistal.sourceforge.net
All rights reserved.
*/

using System;

namespace Net.SourceForge.Vistal.Samples.DummySwitch
{
	interface IDummySwitch
	{
		void Display();
		void PressButton();
	}

	class DummySwitch : Machine
	{
		protected new class Main : Machine.Mode, IDummySwitch
		{
			public void Display()
			{
				Console.Out.WriteLine("main mode");
			}

			public void PressButton()
			{
				NextMode(typeof(Another));
			}
		}
		
		protected class Another : Machine.Mode, IDummySwitch
		{
			public void Display()
			{
				Console.Out.WriteLine("another mode");
			}

			public virtual void PressButton()
			{
				NextMode(typeof(Main));
			}
		}
	}

	class ExtendedSwitch : DummySwitch
	{
		protected new class Another : DummySwitch.Another, IDummySwitch
		{
			public override void PressButton()
			{
				NextMode(typeof(Extension));
			}
		}

		protected class Extension  : Machine.Mode, IDummySwitch
		{
			public void Display()
			{
				Console.Out.WriteLine("extension mode");
			}

			public void PressButton()
			{
				NextMode(typeof(Main));
			}
		}
	}

	class EntryPoint
	{
		static void PlayWith(IDummySwitch toy)
		{
			for (int i = 0; i < 5; i++)
			{
				toy.Display();
				toy.PressButton();
			}
		}

		[STAThread]
		static void Main(string[] args)
		{
			Console.Out.WriteLine("Play with the dummy object: ");
			PlayWith((IDummySwitch)Machine.Create(typeof(IDummySwitch), new DummySwitch()));

			Console.Out.WriteLine("\nThe same game with the EXTENDED dummy object: ");
			PlayWith((IDummySwitch)Machine.Create(typeof(IDummySwitch), new ExtendedSwitch()));
		}
	}
}