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一、定义抽象产品接口

//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
//   abstract product > declares an interface for a type of products
//+------------------------------------------------------------------+
//| participants > abstract product                                  |
//+------------------------------------------------------------------+
interface AbstractProductA{};
//+------------------------------------------------------------------+
//| participants > abstract product                                  |
//+------------------------------------------------------------------+
interface AbstractProductB{void Interact(AbstractProductA*);};

二、定义抽象工厂接口

//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
interface AbstractFactory
//   declares an interface for operations that create abstract products
{AbstractProductA* CreateProductA(void);AbstractProductB* CreateProductB(void);
};

三、定义具体产品

//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
//   concrete product 
//      defines > product object to be created > by concrete factory
//      implements > abstract product interface
//+------------------------------------------------------------------+
//| participants > concrete product                                  |
//+------------------------------------------------------------------+
class ProductA1:public AbstractProductA
{public:ProductA1(void);
};
void ProductA1::ProductA1(void) {Print("product a1 constructed");}
//+------------------------------------------------------------------+
//| participants > concrete product                                  |
//+------------------------------------------------------------------+
class ProductA2:public AbstractProductA
{public:ProductA2(void);
};
void ProductA2::ProductA2(void) {Print("product a2 constructed");}
//+------------------------------------------------------------------+
//| participants > concrete product                                  |
//+------------------------------------------------------------------+
class ProductB1:public AbstractProductB
{public:ProductB1(void);void              Interact(AbstractProductA*);
};
void ProductB1::ProductB1(void) {Print("product b1 constructed");}
void ProductB1::Interact(AbstractProductA*src)
{Print("product b1: ",&this," is interacting with product a: ",src);
}
//+------------------------------------------------------------------+
//| participants > concrete product                                  |
//+------------------------------------------------------------------+
class ProductB2:public AbstractProductB
{public:ProductB2(void);void              Interact(AbstractProductA*);
};
void ProductB2::ProductB2(void) {Print("product b2 constructed");}
void ProductB2::Interact(AbstractProductA*src)
{Print("product b2: ",&this," is interacting with product a: ",src);
}
//
//

四、定义具体工厂

//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
//   concrete factory > implements operations > create concrete products
//+------------------------------------------------------------------+
//| participants > concrete factory                                  |
//+------------------------------------------------------------------+
class Factory1:public AbstractFactory
{public:Factory1(void);AbstractProductA* CreateProductA(void);AbstractProductB* CreateProductB(void);
};
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 1                      |
//+------------------------------------------------------------------+
void Factory1::Factory1(void)
{Print("factory 1: ",&this," constructed");
}
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 1                      |
//+------------------------------------------------------------------+
AbstractProductA* Factory1::CreateProductA(void)
{printf("factory 1 is creating and returning product a1");return new ProductA1;
}
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 1                      |
//+------------------------------------------------------------------+
AbstractProductB* Factory1::CreateProductB(void)
{printf("factory 1 is creating and returning product b1");return new ProductB1;
}
//+------------------------------------------------------------------+
//| participants > concrete factory                                  |
//+------------------------------------------------------------------+
class Factory2:public AbstractFactory
{public:Factory2(void);AbstractProductA* CreateProductA(void);AbstractProductB* CreateProductB(void);
};
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 2                      |
//+------------------------------------------------------------------+
void Factory2::Factory2(void)
{Print("factory 2: ",&this," constructed");
}
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 2                      |
//+------------------------------------------------------------------+
AbstractProductA* Factory2::CreateProductA(void)
{printf("factory 2 is creating and returning product a2");return new ProductA2;
}
//+------------------------------------------------------------------+
//| participants > concrete factory > factory 2                      |
//+------------------------------------------------------------------+
AbstractProductB* Factory2::CreateProductB(void)
{printf("factory 2 is creating and returning product b2");return new ProductB2;
}

五、定义工厂客户端

//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
class FactoryClient
//   uses interfaces > declared by > abstract factory, abstract product
{public:void              Run(void);void              Switch(AbstractFactory*);FactoryClient(AbstractFactory*);~FactoryClient(void);protected:AbstractProductA* apa;AbstractProductB* apb;AbstractFactory*  factory;void              Delete(void);
};
//+------------------------------------------------------------------+
//| participants > factory client                                    |
//+------------------------------------------------------------------+
void FactoryClient::FactoryClient(AbstractFactory* af)
{Print("factory client created and received abstract factory ",af);Print("factory client is requesting to accept/switch the factories");Switch(af);
}
//+------------------------------------------------------------------+
//| participants > factory client                                    |
//+------------------------------------------------------------------+
void FactoryClient::~FactoryClient(void)
{Delete();
}
//+------------------------------------------------------------------+
//| participants > factory client                                    |
//+------------------------------------------------------------------+
void FactoryClient::Run(void)
{Print("factory client is running abstract product b");apb.Interact(apa);
}
//+------------------------------------------------------------------+
//| participants > factory client                                    |
//+------------------------------------------------------------------+
void FactoryClient::Delete(void)
{delete apa;delete apb;delete factory;
}
//+------------------------------------------------------------------+
//| participants > factory client                                    |
//+------------------------------------------------------------------+
void FactoryClient::Switch(AbstractFactory *af)
{string sFactory;StringConcatenate(sFactory,sFactory,factory);int iFactory=(int)StringToInteger(sFactory);if(iFactory>0){Print("factory client is switching old factory ",factory," to new factory ",af);}else{Print("factory client is accepting new factory ",af);}Delete();factory=af;Print("factory client saved the new factory");Print("factory client is requesting its new factory to create product a");apa=factory.CreateProductA();Print("factory client is requesting its new factory to create product b");apb=factory.CreateProductB();
}

六、客户端调用工厂客户端

//+------------------------------------------------------------------+
//| interface for patterns                                           |
//+------------------------------------------------------------------+
interface ClientExample //pattern client
{string Output(void); //returns headervoid Run(void); //execute the pattern client
};//+------------------------------------------------------------------+
//| participants                                                     |
//+------------------------------------------------------------------+
class Client:public ClientExample{
public:string            Output(void);void              Run(void);};
string Client::Output(void) {return __FUNCTION__;}
//+------------------------------------------------------------------+
//| collaborations                                                   |
//+------------------------------------------------------------------+
void Client::Run(void)
//   concrete factory
//      a single instance > normally created at run-time
//      creates products > with particular implementation
//      client uses other factory > for different product objects 
//   abstract factory
//      defers creation > product objects > concrete factory subclass{Print("client is requesting to create factory 1");Print("client is requesting to create the factory client");Print("client is requesting the factory client to manage factory 1");FactoryClient client(new Factory1);Print("client is requesting the factory client to operate");client.Run();Print("client is requesting to create new factory 2 and asking factory client to switch factories");client.Switch(new Factory2);Print("client is requesting the factory client to run again");client.Run();}
}

七、抽象工厂模式的结构

//+------------------------------------------------------------------+
//| structure                                                        |
//+------------------------------------------------------------------+
//
//            | AbstractFactory|<-----------------------------------------|Client|
//            |----------------|                                              |
//            |CreateProductA()|                                              |
//            |CreateProductA()|                    |AbstractProductA|<-------+
//                     ^                                    ^                 |
//                     |                                    |                 |
//         +-----------+----------+                   +-----+-----+           |
//         |                      |                   |           |           |
//|ConcreteFactory1|- +  |ConcreteFactory2|- + ->|ProductA2| |ProductA1|<- +  |
//|----------------|  |  |----------------|  |                             |  |
//|CreateProductA()|     |CreateProductA()|                                   |
//|CreateProductB()|  |  |CreateProductB()|  |                             |  |
//                                                  |AbstractProductB|<----+--+
//                    |                      |              ^              |
//                                                          |
//                    |                      |        +-----+-----+        |
//                                                    |           |
//                    |                      + ->|ProductB2| |ProductB1|<- +
//                                                                         |
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