using System;

     using System.Collections;

     class FlyweightFactory

     {

         private ArrayList pool = new ArrayList();

         // the flyweightfactory can crete all entries in the pool at startup

         // (if the pool is small, and it is likely all will be used), or as

         // needed, if the pool si large and it is likely some will never be used

         public FlyweightFactory()

         {

             pool.Add(new ConcreteEvenFlyweight());

             pool.Add(new ConcreteUnevenFlyweight());

         }

         public Flyweight GetFlyweight(int key)

         {

             // here we would determine if the flyweight identified by key

             // exists, and if so return it. If not, we would create it.

             // As in this demo we have implementation all the possible

             // flyweights we wish to use, we retrun the suitable one.

             int i = key % ;

             return((Flyweight)pool[i]);

         }

     }

     abstract class Flyweight

     {

         abstract public void DoOperation(int extrinsicState);

     }

     class UnsharedConcreteFlyweight : Flyweight

     {

         override public void DoOperation(int extrinsicState)

         {

         }

     }

     class ConcreteEvenFlyweight : Flyweight

     {

         override public void DoOperation(int extrinsicState)

         {

             Console.WriteLine("In ConcreteEvenFlyweight.DoOperation: {0}", extrinsicState);

         }

     }

     class ConcreteUnevenFlyweight : Flyweight

     {

         override public void DoOperation(int extrinsicState)

         {

             Console.WriteLine("In ConcreteUnevenFlyweight.DoOperation: {0}", extrinsicState);

         }

     }

     /// <summary>

     ///    Summary description for Client.

     /// </summary>

     public class Client

     {

         public static int Main(string[] args)

         {

             int[] data = {,,,,,,,};

             FlyweightFactory f = new FlyweightFactory();

             int extrinsicState = ;

             foreach (int i in data)

             {

                 Flyweight flyweight = f.GetFlyweight(i);

                   flyweight.DoOperation(extrinsicState);

             }

             return ;

         }

     }