Builder

// Builder pattern -- Real World example

using System; using System.Collections; namespace DoFactory.GangOfFour.Builder.RealWorld {    // MainApp test application    public class MainApp   {      public static void Main()     {        // Create shop with vehicle builders       Shop shop = new Shop();       VehicleBuilder b1 = new ScooterBuilder();       VehicleBuilder b2 = new CarBuilder();       VehicleBuilder b3 = new MotorCycleBuilder();        // Construct and display vehicles       shop.Construct(b1);       b1.Vehicle.Show();       shop.Construct(b2);       b2.Vehicle.Show();       shop.Construct(b3);       b3.Vehicle.Show();        // Wait for user       Console.Read();     }   }    // "Director"    class Shop   {      // Builder uses a complex series of steps      public void Construct(VehicleBuilder vehicleBuilder)     {       vehicleBuilder.BuildFrame();       vehicleBuilder.BuildEngine();       vehicleBuilder.BuildWheels();       vehicleBuilder.BuildDoors();     }   }    // "Builder"    abstract class VehicleBuilder   {      protected Vehicle vehicle;      // Property      public Vehicle Vehicle     {        get{ return vehicle; }     }      public abstract void BuildFrame();      public abstract void BuildEngine();      public abstract void BuildWheels();      public abstract void BuildDoors();   }    // "ConcreteBuilder1"    class MotorCycleBuilder : VehicleBuilder   {      public override void BuildFrame()     {       vehicle = new Vehicle("MotorCycle");       vehicle["frame"] = "MotorCycle Frame";     }      public override void BuildEngine()     {       vehicle["engine"] = "500 cc";     }      public override void BuildWheels()     {       vehicle["wheels"] = "2";     }      public override void BuildDoors()     {       vehicle["doors"] = "0";     }   }    // "ConcreteBuilder2"    class CarBuilder : VehicleBuilder   {      public override void BuildFrame()     {       vehicle = new Vehicle("Car");       vehicle["frame"] = "Car Frame";     }      public override void BuildEngine()     {       vehicle["engine"] = "2500 cc";     }      public override void BuildWheels()     {       vehicle["wheels"] = "4";     }      public override void BuildDoors()     {       vehicle["doors"] = "4";     }   }    // "ConcreteBuilder3"    class ScooterBuilder : VehicleBuilder   {      public override void BuildFrame()     {       vehicle = new Vehicle("Scooter");       vehicle["frame"] = "Scooter Frame";     }      public override void BuildEngine()     {       vehicle["engine"] = "50 cc";     }      public override void BuildWheels()     {       vehicle["wheels"] = "2";     }      public override void BuildDoors()     {       vehicle["doors"] = "0";     }   }    // "Product"    class Vehicle   {      private string type;      private Hashtable parts = new Hashtable();      // Constructor      public Vehicle( string type)     {        this.type = type;     }      // Indexer (i.e. smart array)      public object this[ string key]     {        get{ return parts[key]; }        set{ parts[key] = value; }     }      public void Show()     {       Console.WriteLine("\n---------------------------");       Console.WriteLine("Vehicle Type: {0}", type);       Console.WriteLine(" Frame : {0}", parts["frame"]);       Console.WriteLine(" Engine : {0}", parts["engine"]);       Console.WriteLine(" #Wheels: {0}", parts["wheels"]);       Console.WriteLine(" #Doors : {0}", parts["doors"]);     }   } }