设计模式 Design Parttern ——抽象工厂Abstract Factory

 设计模式 Design Parttern ——抽象工厂Abstract Factory

http://blog.csdn.net/leeidea

1:头文件

  #ifndef _ABSTRCT_FACTORY_H_VANEY_#define _ABSTRCT_FACTORY_H_VANEY_#include <iostream>using namespace std;/******************************************************************名称 ：AbstractFactory.h版本 ：1.00描述 ：演示抽象工厂类的概念作者 ：[e-mail] http://blog.csdn.net/leeidea日期 ：2010年10月13日版权 ：[e-mail] http://blog.csdn.net/leeidea******************************************************************//*官方解释：The purpose of the Abstract Factory is to provide an interface for creating families of related objects without specifying concrete classes.我的理解：工厂就是一些函数接口的集合，不同的工厂有不同的方法，但如果要使用抽象工厂模式， 需要找到这些工厂的共同点，即在接口上做文章，让各个工厂的接口名称相同，这样就 可以统一接口，在C++中就为这些工厂抽象出一个基类即：抽象工厂类。我的应用：用途很广，可以用在任何程序模块架构中。如为不同的模块可以看作不同的工厂，注意 要保持各个模块间有相同的接口。调用模块的时候就直接通过抽象工厂创建。*///抽象工厂中需要处理事务的抽象基类class CDataBaseHelper{public:CDataBaseHelper(){cout << "CDataBaseHelper()" << endl;}virtual ~CDataBaseHelper(){cout << "~CDataBaseHelper()" << endl;}public:virtual int Insert(int data) = 0;virtual int find(int index) = 0;};//处理事务的具体类class CHelperSQL : public CDataBaseHelper{public:CHelperSQL(){cout << "CHelperSQL()" << endl;}virtual ~CHelperSQL(){cout << "~CHelperSQL()" << endl;}public:virtual int Insert(int data){cout << "CHelperSQL Insert" << endl;return 1;}virtual int find(int index){cout << "CHelperSQL Insert" << endl;return 1;}};//处理事务的具体类class CHelperAccess : public CDataBaseHelper{public:CHelperAccess(){cout << "CHelperAccess()" << endl;}virtual ~CHelperAccess(){cout << "~CHelperAccess()" << endl;}public:virtual int Insert(int data){cout << "CHelperAccess Insert" << endl;return 1;}virtual int find(int index){cout << "CHelperAccess Insert" << endl;return 1;}};//抽象工厂类class CAbstractFactory{public:CAbstractFactory(){cout << "CAbstractFactory()" << endl;}virtual ~CAbstractFactory(){cout << "~CAbstractFactory()" << endl;}public:virtual CDataBaseHelper* GetHelper() = 0;};//具体工厂class CFactorySQL : public CAbstractFactory{public:CFactorySQL(){cout << "CFactorySQL()" << endl;}virtual ~CFactorySQL(){cout << "~CFactorySQL()" << endl;}public:virtual CDataBaseHelper* GetHelper(){cout << "get CHelperSQL helper" << endl;return new CHelperSQL();}};//具体工厂class CFactoryAccess : public CAbstractFactory{public:CFactoryAccess(){cout << "CFactoryAccess()" << endl;}virtual ~CFactoryAccess(){cout << "~CFactoryAccess()" << endl;}public:virtual CDataBaseHelper* GetHelper(){cout << "get CHelperAccess helper" << endl;return new CHelperAccess();}};#define VANEY_API//用户extern "C" VANEY_API int UsingAB();#endif

 

2:源文件

#include "AbstractFactory.h"VANEY_API int UsingAB(){/*使用SQL工厂*/CAbstractFactory* factorySQL = new CFactorySQL();CDataBaseHelper* helperSQL = factorySQL->GetHelper();helperSQL->find(10);helperSQL->Insert(10);/*使用Access工厂*/CAbstractFactory* factoryAccess = new CFactoryAccess();CDataBaseHelper* helperAccess = factoryAccess->GetHelper();helperAccess->find(10);helperAccess->Insert(10);return 1;}   

3：用户文件main.c

 extern int UsingAB();//系统默认入口int _tmain(int argc, _TCHAR* argv[]){ return UsingAB();}