compositephotolibrary.cs

  using System;
  using System.Collections.Generic;
  using System.IO;
  using CompositePattern;

  //  Composite Pattern    Judith Bishop August 2007
  //  The pattern is generic, and an example is given for a real world client
 
  // The Client
  class CompositePatternExample {
    static void Main () {
      IComponent <string> album = new Composite<string> ("Album");
      IComponent <string> point = album;
      string [] s;
      string command, parameter;
      // Create and manipulate a structure
      StreamReader instream = new StreamReader("composite.dat");
      do {
        string t= instream.ReadLine();
        Console.WriteLine("\t\t\t\t"+t);
        s = t.Split();
        command = s[0];
        if (s.Length>1) parameter = s[1]; else parameter = null;
        switch (command) {
          case "AddSet"   :   
            IComponent <string> c = new Composite <string> (parameter);
            point.Add(c);
            point = c;
            break;
          case "AddPhoto":  point.Add(new Component <string> (parameter)); break;
          case "Remove"   : point = point.Remove(parameter); break;
          case "Find"        : point = album.Find(parameter);  break;
          case "Display"    : Console.WriteLine(album.Display(0));  break;
          case "Quit"        : break;
        }

      } while (!command.Equals("Quit"));
    }
  }