builderbags.cs

using System;
  using System.Diagnostics;
  using System.IO;
  using System.Threading;

  namespace BuilderPattern {
    //  Builder Pattern    D-J Miller and Judith Bishop Sept 2007

    // Abstract Factory : Builder Implementation
    interface IBuilder<Brand>
      where Brand : IBrand {
      IBag CreateBag();
    }

    // Abstract Factory now the Builder
    class Builder<Brand> : IBuilder<Brand>
      where Brand : IBrand, new() {

      Brand myBrand;
      public Builder() {
        myBrand = new Brand();
      }

      public IBag CreateBag() {
        return myBrand.CreateBag();
      }
    }

    // Product 1
    interface IBag {
      string Properties { get; set; }
    }

    // Concrete Product 1
    class Bag :IBag {
      public string Properties { get; set; }
    }

    // Directors
    interface IBrand {
      IBag CreateBag();
    }

    class Gucci : IBrand {
      public IBag CreateBag() {
        Bag b = new Bag();
        Program.DoWork("Cut Leather", 250);
        Program.DoWork("Sew leather", 1000);
        b.Properties += "Leather";
        Program.DoWork("Create Lining", 500);
        Program.DoWork("Attach Lining", 1000);
        b.Properties += " lined";
        Program.DoWork("Add Label", 250);
        b.Properties += " with label";
        return b;
      }
    }

    class Poochy : IBrand {
      public IBag CreateBag() {
        Bag b = new Bag();
        Program.DoWork("Hire cheap labour", 200);
        Program.DoWork("Cut Plastic", 125);
        Program.DoWork("Sew Plastic", 500);
        b.Properties += "Plastic";
        Program.DoWork("Add Label", 100);
        b.Properties += " with label";
        return b;
      }
    }

    class Client<Brand>
      where Brand : IBrand, new() {
        
      public void ClientMain() { //IFactory<Brand> factory)
        IBuilder<Brand> factory = new Builder<Brand>();

        DateTime date = DateTime.Now;
        Console.WriteLine("I want to buy a bag!");
        IBag bag = factory.CreateBag();

        Console.WriteLine("I got my Bag which took " + DateTime.Now.Subtract(date).TotalSeconds * 5 + " days");
        Console.WriteLine("  with the following properties " + bag.Properties+"\n");
      }
    }

    static class Program {
    
      static void Main() {
        // Call Client twice
        new Client<Poochy>().ClientMain();
        new Client<Gucci>().ClientMain();
      }

      public static void DoWork(string workitem, int time) {
        Console.Write("" + workitem + ": 0%");
        Thread.Sleep(time);
        Console.Write("....25%");
        Thread.Sleep(time);
        Console.Write("....50%");
        Thread.Sleep(time);
        Console.WriteLine("....100%");
      }
    }
  }
/*Output
I want to buy a bag!
Hire cheap labour: 0%....25%....50%....100%
Cut Plastic: 0%....25%....50%....100%
Sew Plastic: 0%....25%....50%....100%
Add Label: 0%....25%....50%....100%
I got my Bag which took 14.02016 days
  with the following properties Plastic with label

I want to buy a bag!
Cut Leather: 0%....25%....50%....100%
Sew leather: 0%....25%....50%....100%
Create Lining: 0%....25%....50%....100%
Attach Lining: 0%....25%....50%....100%
Add Label: 0%....25%....50%....100%
I got my Bag which took 45.0648 days
  with the following properties Leather lined with label

*/