C#设计模式(8)-Builder Pattern
2006-08-31 10:02
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一、 建造者(Builder)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。对象性质的建造
有些情况下,一个对象会有一些重要的性质,在它们没有恰当的值之前,对象不能作为一个完整的产品使用。比如,一个电子邮件有发件人地址、收件人地址、主题、内容、附录等部分,而在最起码的收件人地址未被赋值之前,这个电子邮件不能发出。
有些情况下,一个对象的一些性质必须按照某个顺序赋值才有意义。在某个性质没有赋值之前,另一个性质则无法赋值。这些情况使得性质本身的建造涉及到复杂的商业逻辑。
这时候,此对象相当于一个有待建造的产品,而对象的这些性质相当于产品的零件,建造产品的过程就是组合零件的过程。由于组合零件的过程很复杂,因此,这些"零件"的组合过程往往被"外部化"到一个称作建造者的对象里,建造者返还给客户端的是一个全部零件都建造完毕的产品对象。
命名的考虑
之所以使用"建造者"而没有用"生成器"就是因为用零件生产产品,"建造"更为合适,"创建"或"生成"不太恰当。
二、 Builder模式的结构:
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/Pic53.gif)
建造者(Builder)角色: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。一般而言,此接口独立于应用程序的商业逻辑。模式中直接创建产品对象的是具体建造者(ConcreteBuilder)角色。具体建造者类必须实现这个接口所要求的方法:一个是建造方法,另一个是结果返还方法。
具体建造者(Concrete Builder)角色:担任这个角色的是于应用程序紧密相关的类,它们在应用程序调用下创建产品实例。这个角色主要完成的任务包括:
实现Builder角色提供的接口,一步一步完成创建产品实例的过程。
在建造过程完成后,提供产品的实例。
指导者(Director)角色:担任这个角色的类调用具体建造者角色以创建产品对象。导演者并没有产品类的具体知识,真正拥有产品类的具体知识的是具体建造者对象。
产品(Product)角色:产品便是建造中的复杂对象。
指导者角色是于客户端打交道的角色。导演者角色将客户端创建产品的请求划分为对各个零件的建造请求,再将这些请求委派给具体建造者角色。具体建造者角色是做具体建造工作的,但却不为客户端所知。
三、 程序举例:
该程序演示了Builder模式一步一步完成构件复杂产品的过程。用户可以控制生成过程以及生成不同对象。![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// Builder pattern -- Structural example
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using System;
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using System.Collections;
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// "Director"
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class Director
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{
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// Methods
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public void Construct( Builder builder )
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{
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builder.BuildPartA();
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builder.BuildPartB();
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}
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}
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// "Builder"
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abstract class Builder
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{
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// Methods
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abstract public void BuildPartA();
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abstract public void BuildPartB();
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abstract public Product GetResult();
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}
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// "ConcreteBuilder1"
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class ConcreteBuilder1 : Builder
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{
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// Fields
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private Product product;
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// Methods
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override public void BuildPartA()
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{
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product = new Product();
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product.Add( "PartA" );
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}
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override public void BuildPartB()
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{
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product.Add( "PartB" );
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}
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override public Product GetResult()
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{
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return product;
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}
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}
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// "ConcreteBuilder2"
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class ConcreteBuilder2 : Builder
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{
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// Fields
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private Product product;
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// Methods
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override public void BuildPartA()
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{
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product = new Product();
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product.Add( "PartX" );
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}
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override public void BuildPartB()
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{
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product.Add( "PartY" );
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}
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override public Product GetResult()
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{
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return product;
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}
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}
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// "Product"
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class Product
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{
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// Fields
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ArrayList parts = new ArrayList();
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// Methods
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public void Add( string part )
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{
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parts.Add( part );
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}
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public void Show()
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{
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Console.WriteLine( " Product Parts -------" );
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foreach( string part in parts )
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Console.WriteLine( part );
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}
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}
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/**//// <summary>
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/// Client test
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/// </summary>
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public class Client
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{
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public static void Main( string[] args )
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{
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// Create director and builders
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Director director = new Director( );
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Builder b1 = new ConcreteBuilder1();
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Builder b2 = new ConcreteBuilder2();
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// Construct two products
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director.Construct( b1 );
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Product p1 = b1.GetResult();
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p1.Show();
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director.Construct( b2 );
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Product p2 = b2.GetResult();
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p2.Show();
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}
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}
四、 建造者模式的活动序列:
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/Pic54.gif)
客户端负责创建指导者和具体建造者对象。然后,客户把具体建造者对象交给指导者。客户一声令下,指导者操纵建造者开始创建产品。当产品创建完成后,建造者把产品返还给客户端。
五、 建造者模式的实现:
下面的程序代码演示了Shop对象使用VehicleBuilders来建造不同的交通工具。该例子使用了Builder模式顺序建造交通工具的不同部分。![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// Builder pattern -- Real World example
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
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using System.Collections;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// "Director"
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class Shop
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{
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// Methods
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public void Construct( VehicleBuilder vehicleBuilder )
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{
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vehicleBuilder.BuildFrame();
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vehicleBuilder.BuildEngine();
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vehicleBuilder.BuildWheels();
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vehicleBuilder.BuildDoors();
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}
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}
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// "Builder"
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abstract class VehicleBuilder
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{
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// Fields
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protected Vehicle vehicle;
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// Properties
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public Vehicle Vehicle
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{
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get
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{ return vehicle; }
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}
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// Methods
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abstract public void BuildFrame();
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abstract public void BuildEngine();
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abstract public void BuildWheels();
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abstract public void BuildDoors();
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}
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// "ConcreteBuilder1"
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class MotorCycleBuilder : VehicleBuilder
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{
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// Methods
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override public void BuildFrame()
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{
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vehicle = new Vehicle( "MotorCycle" );
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vehicle[ "frame" ] = "MotorCycle Frame";
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}
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override public void BuildEngine()
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{
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vehicle[ "engine" ] = "500 cc";
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}
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override public void BuildWheels()
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{
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vehicle[ "wheels" ] = "2";
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}
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override public void BuildDoors()
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{
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vehicle[ "doors" ] = "0";
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}
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}
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// "ConcreteBuilder2"
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class CarBuilder : VehicleBuilder
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildFrame()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle = new Vehicle( "Car" );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "frame" ] = "Car Frame";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildEngine()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "engine" ] = "2500 cc";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildWheels()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "wheels" ] = "4";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildDoors()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "doors" ] = "4";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// "ConcreteBuilder3"
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class ScooterBuilder : VehicleBuilder
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildFrame()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle = new Vehicle( "Scooter" );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "frame" ] = "Scooter Frame";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildEngine()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "engine" ] = "none";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildWheels()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "wheels" ] = "2";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
override public void BuildDoors()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
vehicle[ "doors" ] = "0";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// "Product"
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Vehicle
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Fields
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string type;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private Hashtable parts = new Hashtable();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Constructors
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Vehicle( string type )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.type = type;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Indexers
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public object this[ string key ]
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
get
![](http://www.cnblogs.com/Images/dot.gif)
{ return parts[ key ]; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
set
![](http://www.cnblogs.com/Images/dot.gif)
{ parts[ key ] = value; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void Show()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( " ---------------------------");
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( "Vehicle Type: "+ type );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( " Frame : " + parts[ "frame" ] );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( " Engine : "+ parts[ "engine"] );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( " #Wheels: "+ parts[ "wheels"] );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine( " #Doors : "+ parts[ "doors" ] );
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// BuilderApp test
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public class BuilderApp
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void Main( string[] args )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Create shop and vehicle builders
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Shop shop = new Shop();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
VehicleBuilder b1 = new ScooterBuilder();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
VehicleBuilder b2 = new CarBuilder();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
VehicleBuilder b3 = new MotorCycleBuilder();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Construct and display vehicles
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
shop.Construct( b1 );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b1.Vehicle.Show();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
shop.Construct( b2 );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b2.Vehicle.Show();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
shop.Construct( b3 );
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b3.Vehicle.Show();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
六、 建造者模式的演化
建造者模式在使用的过程中可以演化出多种形式。省略抽象建造者角色
如果系统中只需要一个具体建造者的话,可以省略掉抽象建造者。这时代码可能如下:
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// "Director"
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Director
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private ConcreteBuilder builder;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void Construct()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
builder.BuildPartA();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
builder.BuildPartB();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
省略指导者角色
在具体建造者只有一个的情况下,如果抽象建造者角色已经被省略掉,那么还可以省略掉指导者角色。让Builder角色自己扮演指导者与建造者双重角色。这时代码可能如下:
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public class Builder
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private Product product = new Product();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void BuildPartA()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//Some code here
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void BuildPartB()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//Some code here
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Product GetResult()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return product;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void Construct()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
BuildPartA();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
BuildPartB();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
同时,客户端也需要进行相应的调整,如下:
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public class Client
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static Builder builder;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void Main()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
builder = new Builder();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
builder.Construct();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Product product = builder.GetResult();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
C#中的StringBuilder就是这样一个例子。
七、 在什么情况下使用建造者模式
以下情况应当使用建造者模式:1、 需要生成的产品对象有复杂的内部结构。
2、 需要生成的产品对象的属性相互依赖,建造者模式可以强迫生成顺序。
3、 在对象创建过程中会使用到系统中的一些其它对象,这些对象在产品对象的创建过程中不易得到。
使用建造者模式主要有以下效果:
1、 建造模式的使用使得产品的内部表象可以独立的变化。使用建造者模式可以使客户端不必知道产品内部组成的细节。
2、 每一个Builder都相对独立,而与其它的Builder无关。
3、 模式所建造的最终产品更易于控制。
参考文献:
阎宏,《Java与模式》,电子工业出版社
[美]James W. Cooper,《C#设计模式》,电子工业出版社
[美]Alan Shalloway James R. Trott,《Design Patterns Explained》,中国电力出版社
[美]Robert C. Martin,《敏捷软件开发-原则、模式与实践》,清华大学出版社
[美]Don Box, Chris Sells,《.NET本质论 第1卷:公共语言运行库》,中国电力出版社
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