Builder(建造者)模式

建造者模式可以将一个产品的内部表象与产品的生成过程分割开来，从而可以使一个建造过程生成具有不同的内部表象的产品对象。

Director：担任这个角色的类调用具体建造者角色以创建产品对象。

Builder：给出一个抽象接口，以规范产品对象的各个组成成分的建造。如汽车由车轮、方向盘、车厢等等组成。

　　　  public void BuildPart()方法给与其子类去实现，就是由子类去创建车轮、方向盘、车厢等等。

ConcreteBuilder：用于实例化操作的子类，继承自Builder。

　　　　public void BuildPart（）实例化各个部件

　　　　public Product GetResult（）返回结果

Product：对象。车轮、方向盘、车厢

using System;
 using System.Collections;
 
 // "Director"
 class Shop
  {
   // Methods
   public void Construct( VehicleBuilder vehicleBuilder )
    {
     vehicleBuilder.BuildFrame();
     vehicleBuilder.BuildEngine();
     vehicleBuilder.BuildWheels();
     vehicleBuilder.BuildDoors();
   }
 }
 
 // "Builder"
 abstract class VehicleBuilder
  {
   // Fields
   protected Vehicle vehicle;
 
   // Properties
   public Vehicle Vehicle
    {
      get{ return vehicle; }
   }
 
   // Methods
   abstract public void BuildFrame();
   abstract public void BuildEngine();
   abstract public void BuildWheels();
   abstract public void BuildDoors();
 }
 
 // "ConcreteBuilder1"
 class MotorCycleBuilder : VehicleBuilder
  {
   // Methods
   override public void BuildFrame()
    {
     vehicle = new Vehicle( "MotorCycle" );
     vehicle[ "frame" ] = "MotorCycle Frame";
   }
 
   override public void BuildEngine()
    {
     vehicle[ "engine" ] = "500 cc";
   }
 
   override public void BuildWheels()
    {
     vehicle[ "wheels" ] = "2";
   }
 
   override public void BuildDoors()
    {
     vehicle[ "doors" ] = "0";
   }
 }
 
 // "ConcreteBuilder2"
 class CarBuilder : VehicleBuilder
  {
   // Methods
   override public void BuildFrame()
    {
     vehicle = new Vehicle( "Car" );
     vehicle[ "frame" ] = "Car Frame";
   }
 
   override public void BuildEngine()
    {
     vehicle[ "engine" ] = "2500 cc";
   }
 
   override public void BuildWheels()
    {
     vehicle[ "wheels" ] = "4";
   }
 
   override public void BuildDoors()
    {
     vehicle[ "doors" ] = "4";
   }
 }
 
 // "ConcreteBuilder3"
 class ScooterBuilder : VehicleBuilder
  {
   // Methods
   override public void BuildFrame()
    {
     vehicle = new Vehicle( "Scooter" );
     vehicle[ "frame" ] = "Scooter Frame";
   }
 
   override public void BuildEngine()
    {
     vehicle[ "engine" ] = "none";
   }
 
   override public void BuildWheels()
    {
     vehicle[ "wheels" ] = "2";
   }
 
   override public void BuildDoors()
    {
     vehicle[ "doors" ] = "0";
   }
 }
 
 // "Product"
 class Vehicle
  {
   // Fields
   private string type;
   private Hashtable parts = new Hashtable();
 
   // Constructors
   public Vehicle( string type )
    {
     this.type = type;
   }
 
   // Indexers
   public object this[ string key ]
    {
      get{ return parts[ key ]; }
      set{ parts[ key ] = value; }
   }
 
   // Methods
   public void Show()
    {
     Console.WriteLine( " ---------------------------");
     Console.WriteLine( "Vehicle Type: "+ type );
     Console.WriteLine( " Frame : " + parts[ "frame" ] );
     Console.WriteLine( " Engine : "+ parts[ "engine"] );
     Console.WriteLine( " #Wheels: "+ parts[ "wheels"] );
     Console.WriteLine( " #Doors : "+ parts[ "doors" ] );
   }
 }
 
  /// <summary>
 /// BuilderApp test
 /// </summary>
 public class BuilderApp
  {
   public static void Main( string[] args )
    {
     // Create shop and 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();
   }
 }

 

using System;
using System.Collections;

// "Director"
class Shop
{
  // Methods
  public void Construct( VehicleBuilder vehicleBuilder )
  {
    vehicleBuilder.BuildFrame();
    vehicleBuilder.BuildEngine();
    vehicleBuilder.BuildWheels();
    vehicleBuilder.BuildDoors();
  }
}

// "Builder"
abstract class VehicleBuilder
{
  // Fields
  protected Vehicle vehicle;

  // Properties
  public Vehicle Vehicle
  {
    get{ return vehicle; }
  }

  // Methods
  abstract public void BuildFrame();
  abstract public void BuildEngine();
  abstract public void BuildWheels();
  abstract public void BuildDoors();
}

// "ConcreteBuilder1"
class MotorCycleBuilder : VehicleBuilder
{
  // Methods
  override public void BuildFrame()
  {
    vehicle = new Vehicle( "MotorCycle" );
    vehicle[ "frame" ] = "MotorCycle Frame";
  }

  override public void BuildEngine()
  {
    vehicle[ "engine" ] = "500 cc";
  }

  override public void BuildWheels()
  {
    vehicle[ "wheels" ] = "2";
  }

  override public void BuildDoors()
  {
    vehicle[ "doors" ] = "0";
  }
}

// "ConcreteBuilder2"
class CarBuilder : VehicleBuilder
{
  // Methods
  override public void BuildFrame()
  {
    vehicle = new Vehicle( "Car" );
    vehicle[ "frame" ] = "Car Frame";
  }

  override public void BuildEngine()
  {
    vehicle[ "engine" ] = "2500 cc";
  }

  override public void BuildWheels()
  {
    vehicle[ "wheels" ] = "4";
  }

  override public void BuildDoors()
  {
    vehicle[ "doors" ] = "4";
  }
}

// "ConcreteBuilder3"
class ScooterBuilder : VehicleBuilder
{
  // Methods
  override public void BuildFrame()
  {
    vehicle = new Vehicle( "Scooter" );
    vehicle[ "frame" ] = "Scooter Frame";
  }

  override public void BuildEngine()
  {
    vehicle[ "engine" ] = "none";
  }

  override public void BuildWheels()
  {
    vehicle[ "wheels" ] = "2";
  }

  override public void BuildDoors()
  {
    vehicle[ "doors" ] = "0";
  }
}

// "Product"
class Vehicle
{
  // Fields
  private string type;
  private Hashtable parts = new Hashtable();

  // Constructors
  public Vehicle( string type )
  {
    this.type = type;
  }

  // Indexers
  public object this[ string key ]
  {
    get{ return parts[ key ]; }
    set{ parts[ key ] = value; }
  }

  // Methods
  public void Show()
  {
    Console.WriteLine( " ---------------------------");
    Console.WriteLine( "Vehicle Type: "+ type );
    Console.WriteLine( " Frame : " + parts[ "frame" ] );
    Console.WriteLine( " Engine : "+ parts[ "engine"] );
    Console.WriteLine( " #Wheels: "+ parts[ "wheels"] );
    Console.WriteLine( " #Doors : "+ parts[ "doors" ] );
  }
}

/**//// <summary>
/// BuilderApp test
/// </summary>
public class BuilderApp
{
  public static void Main( string[] args )
  {
    // Create shop and 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();
  }
}