抽象工厂模式

【1】什么是抽象工厂模式？

为创建一组相关或相互依赖的对象提供一个接口，而且无需指定他们的具体类

【2】抽象工厂模式的代码示例：

代码示例：

#include <iostream>
#include <string>
using namespace std;

class IUser
{
public:
virtual void getUser() = 0;
virtual void setUser() = 0;
};

class SqlUser : public IUser
{
public:
void getUser()
{
cout << "在sql中返回user" << endl;
}
void setUser()
{
cout << "在sql中设置user" << endl;
}
};

class AccessUser : public IUser
{
public:
void getUser()
{
cout << "在Access中返回user" << endl;
}
void setUser()
{
cout << "在Access中设置user" << endl;
}
};

class IDepartment
{
public:
virtual void getDepartment() = 0;
virtual void setDepartment() = 0;
};

class SqlDepartment : public IDepartment
{
public:
void getDepartment()
{
cout << "在sql中返回Department" << endl;
}
void setDepartment()
{
cout << "在sql中设置Department" << endl;
}
};

class AccessDepartment : public IDepartment
{
public:
void getDepartment()
{
cout << "在Access中返回Department" << endl;
}
void setDepartment()
{
cout << "在Access中设置Department" << endl;
}
};

class IFactory
{
public:
virtual IUser *createUser() = 0;
virtual IDepartment *createDepartment() = 0;
};

class SqlFactory : public IFactory
{
public:
IUser *createUser()
{
return new SqlUser();
}
IDepartment *createDepartment()
{
return new SqlDepartment();
}
};

class AccessFactory : public IFactory
{
public:
IUser *createUser()
{
return new AccessUser();
}
IDepartment *createDepartment()
{
return new AccessDepartment();
}
};

/*************************************************************/

class DataAccess
{
private:
static string db;
public:
static IUser *createUser()
{
if (db == "access")
{
return new AccessUser();
}
else if (db == "sql")
{
return new SqlUser();
}
}
static IDepartment *createDepartment()
{
if (db == "access")
{
return new AccessDepartment();
}
else if (db == "sql")
{
return new SqlDepartment();
}
}
};

string DataAccess::db = "sql";

/*************************************************************/

int main()
{
IFactory *factory;
IUser *user;
IDepartment *department;

factory = new AccessFactory();
user = factory->createUser();
department = factory->createDepartment();

user->getUser();
user->setUser();
department->getDepartment();
department->setDepartment();

user = DataAccess::createUser();
department = DataAccess::createDepartment();

user->getUser();
user->setUser();
department->getDepartment();
department->setDepartment();

return 0;
}

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