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模式設計c#－－創建型－－AbstractFactory

名稱	Abstract Factory
結構
意圖	提供一個創建一系列相關或相互依賴對象的接口，而無需指定它們具體的類。
適用性	一個系統要獨立于它的產品的創建、組合和表示時。一個系統要由多個產品系列中的一個來配置時。當你要強調一系列相關的產品對象的設計以便進行聯合使用時。當你提供一個產品類庫，而只想顯示它們的接口而不是實現時。

??????
Code Example
???????

namespace?AbstractFactory_DesignPattern

{

????using?System;

????//?These?classes?could?be?part?of?a?framework,

????//?which?we?will?call?DP

????//?===========================================

????

????abstract?class?DPDocument?

????{

????????abstract?public?void?Dump();????????

????}

????abstract?class?DPWorkspace

????{

????????abstract?public?void?Dump();

????}

????

????abstract?class?DPView?

????{

????????abstract?public?void?Dump();

????}????

????

????abstract?class?DPFactory?

????{

????????abstract?public?DPDocument?CreateDocument();

????????abstract?public?DPView?CreateView();

????????abstract?public?DPWorkspace?CreateWorkspace();

????}

????abstract?class?DPApplication?

????{

????????protected?DPDocument?doc;

????????protected?DPWorkspace?workspace;

????????protected?DPView?view;

????????

????????public?void?ConstructObjects(DPFactory?factory)

????????{

????????????//?Create?objects?as?needed

????????????doc?=?factory.CreateDocument();

????????????workspace?=?factory.CreateWorkspace();

????????????view?=?factory.CreateView();

????????}????????

????????

????????abstract?public?void?Dump();

????????public?void?DumpState()

????????{

????????????if?(doc?!=?null)?doc.Dump();

????????????if?(workspace?!=?null)?workspace.Dump();

????????????if?(view?!=?null)?view.Dump();

????????}

????}

????//?These?classes?could?be?part?of?an?application?

????class?MyApplication?:?DPApplication?

????{

????????MyFactory?myFactory?=?new?MyFactory();

????????override?public?void?Dump()

????????{

????????????Console.WriteLine("MyApplication?exists");

????????}

????????public?void?CreateFamily()

????????{

????????????MyFactory?myFactory?=?new?MyFactory();

????????????ConstructObjects(myFactory);????????????

????????}

????}????

????class?MyDocument?:?DPDocument?

????{

????????public?MyDocument()

????????{

????????????????Console.WriteLine("in?MyDocument?constructor");????????????

????????}

????????

????????override?public?void?Dump()

????????{

????????????Console.WriteLine("MyDocument?exists");

????????}

????}

????class?MyWorkspace?:?DPWorkspace?

????{

????????override?public?void?Dump()

????????{

????????????Console.WriteLine("MyWorkspace?exists");

????????}

????}

????class?MyView?:?DPView?

????{

????????override?public?void?Dump()

????????{

????????????Console.WriteLine("MyView?exists");

????????}

????}

????class?MyFactory?:?DPFactory?

????{

????????override?public?DPDocument?CreateDocument()

????????{

????????????return?new?MyDocument();

????????}

????????override?public?DPWorkspace?CreateWorkspace()

????????{

????????????return?new?MyWorkspace();

????????}????????

????????override?public?DPView?CreateView()

????????{

????????????return?new?MyView();

????????}

????}

????///?<summary>

????///????Summary?description?for?Client.

????///?</summary>

????public?class?Client

????{

????????public?static?int?Main(string[]?args)

????????{

????????????MyApplication?myApplication?=?new?MyApplication();

????????????myApplication.CreateFamily();

????????????myApplication.DumpState();

????????????

????????????return?0;

????????}

????}

}

//?Abstract?Factory?pattern?--?Structural?example??

using?System;

namespace?DoFactory.GangOfFour.Abstract.Structural

{

??//?MainApp?test?application?

??class?MainApp

??{

????public?static?void?Main()

????{

??????//?Abstract?factory?#1?

??????AbstractFactory?factory1?=?new?ConcreteFactory1();

??????Client?c1?=?new?Client(factory1);

??????c1.Run();

??????//?Abstract?factory?#2?

??????AbstractFactory?factory2?=?new?ConcreteFactory2();

??????Client?c2?=?new?Client(factory2);

??????c2.Run();

??????//?Wait?for?user?input?

??????Console.Read();

????}

??}

??//?"AbstractFactory"?

??abstract?class?AbstractFactory

??{

????public?abstract?AbstractProductA?CreateProductA();

????public?abstract?AbstractProductB?CreateProductB();

??}

??//?"ConcreteFactory1"?

??class?ConcreteFactory1?:?AbstractFactory

??{

????public?override?AbstractProductA?CreateProductA()

????{

??????return?new?ProductA1();

????}

????public?override?AbstractProductB?CreateProductB()

????{

??????return?new?ProductB1();

????}

??}

??//?"ConcreteFactory2"?

??class?ConcreteFactory2?:?AbstractFactory

??{

????public?override?AbstractProductA?CreateProductA()

????{

??????return?new?ProductA2();

????}

????public?override?AbstractProductB?CreateProductB()

????{

??????return?new?ProductB2();

????}

??}

??//?"AbstractProductA"?

??abstract?class?AbstractProductA

??{

??}

??//?"AbstractProductB"?

??abstract?class?AbstractProductB

??{

????public?abstract?void?Interact(AbstractProductA?a);

??}

??//?"ProductA1"?

??class?ProductA1?:?AbstractProductA

??{

??}

??//?"ProductB1"?

??class?ProductB1?:?AbstractProductB

??{

????public?override?void?Interact(AbstractProductA?a)

????{

??????Console.WriteLine(this.GetType().Name?+?

????????"?interacts?with?"?+?a.GetType().Name);

????}

??}

??//?"ProductA2"?

??class?ProductA2?:?AbstractProductA

??{

??}

??//?"ProductB2"?

??class?ProductB2?:?AbstractProductB

??{

????public?override?void?Interact(AbstractProductA?a)

????{

??????Console.WriteLine(this.GetType().Name?+?

????????"?interacts?with?"?+?a.GetType().Name);

????}

??}

??//?"Client"?-?the?interaction?environment?of?the?products?

??class?Client

??{

????private?AbstractProductA?AbstractProductA;

????private?AbstractProductB?AbstractProductB;

????//?Constructor?

????public?Client(AbstractFactory?factory)

????{

??????AbstractProductB?=?factory.CreateProductB();

??????AbstractProductA?=?factory.CreateProductA();

????}

????public?void?Run()

????{

??????AbstractProductB.Interact(AbstractProductA);

????}

??}

}

Output

ProductB1 interacts with ProductA1
ProductB2 interacts with ProductA2

posted on 2006-01-03 14:43 夢在天涯閱讀(1060) 評論(3) 編輯收藏引用所屬分類: Design pattern

實際上，有些時候兩者是結合使用的。我見過BuilderFactory。在Java的DOM模型中就使用了BuilderFactory。

Java 環境中，解析文件是一個三步過程：

1、創建 DocumentBuilderFactory。 DocumentBuilderFactory 對象創建 DocumentBuilder。
2、創建 DocumentBuilder。 DocumentBuilder 執行實際的解析以創建 Document 對象。
3、解析文件以創建 Document 對象。

關鍵代碼如下：

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
import org.w3c.dom.Document;

public class OrderProcessor {
public static void main (String args[]) {
File docFile = new File("orders.xml");
Document doc = null;
try {

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(docFile);

} catch (Exception e) {
System.out.print("Problem parsing the file: "+e.getMessage());
}
}
}

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# re: 模式設計c#－－創建型－－AbstractFactory 2006-04-24 10:10 夢在天涯

# re: 模式設計c#－－創建型－－AbstractFactory 2006-04-24 10:34 夢在天涯

# re: 模式設計c#－－創建型－－AbstractFactory 2006-04-24 10:38 夢在天涯

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