抽象工厂模式

  1 #include <iostream>
  2 #include <string>
  3 using namespace std;
  4 
  5 class IUser
  6 {
  7 public:
  8     virtual void getUser() = 0;
  9     virtual void setUser() = 0;
 10 };
 11 
 12 class SqlUser : public IUser
 13 {
 14 public:
 15     void getUser()
 16     {
 17         cout << "在sql中返回user" << endl;
 18     }
 19     void setUser()
 20     {
 21         cout << "在sql中设置user" << endl;
 22     }
 23 };
 24 
 25 class AccessUser : public IUser
 26 {
 27 public:
 28     void getUser()
 29     {
 30         cout << "在Access中返回user" << endl;
 31     }
 32     void setUser()
 33     {
 34         cout << "在Access中设置user" << endl;
 35     }
 36 };
 37 
 38 class IDepartment
 39 {
 40 public:
 41     virtual void getDepartment() = 0;
 42     virtual void setDepartment() = 0;
 43 };
 44 
 45 class SqlDepartment : public IDepartment
 46 {
 47 public:
 48     void getDepartment()
 49     {
 50         cout << "在sql中返回Department" << endl;
 51     }
 52     void setDepartment()
 53     {
 54         cout << "在sql中设置Department" << endl;
 55     }
 56 };
 57 
 58 class AccessDepartment : public IDepartment
 59 {
 60 public:
 61     void getDepartment()
 62     {
 63         cout << "在Access中返回Department" << endl;
 64     }
 65     void setDepartment()
 66     {
 67         cout << "在Access中设置Department" << endl;
 68     }
 69 };
 70 
 71 class IFactory
 72 {
 73 public:
 74     virtual IUser *createUser() = 0;
 75     virtual IDepartment *createDepartment() = 0;
 76 };
 77 
 78 class SqlFactory : public IFactory
 79 {
 80 public:
 81     IUser *createUser() 
 82     {
 83         return new SqlUser();
 84     }
 85     IDepartment *createDepartment() 
 86     {
 87         return new SqlDepartment();
 88     }
 89 };
 90 
 91 class AccessFactory : public IFactory
 92 {
 93 public:
 94     IUser *createUser()
 95     {
 96         return new AccessUser();
 97     }
 98     IDepartment *createDepartment() 
 99     {
100         return new AccessDepartment();
101     }
102 };
103 
104 /*************************************************************/
105 
106 class DataAccess
107 {
108 private:
109     static string db;
110 public:
111     static IUser *createUser()
112     {
113         if (db == "access")
114         {
115             return new AccessUser();
116         }
117         else if (db == "sql")
118         {
119             return new SqlUser();
120         }
121     }
122     static IDepartment *createDepartment()
123     {
124         if (db == "access")
125         {
126             return new AccessDepartment();
127         }
128         else if (db == "sql")
129         {
130             return new SqlDepartment();
131         }    
132     }
133 };
134 
135 string DataAccess::db = "sql";
136 
137 /*************************************************************/
138 
139 int main()
140 {
141     IFactory *factory;
142     IUser *user;
143     IDepartment *department;
144 
145     factory = new AccessFactory();
146     user = factory->createUser();
147     department = factory->createDepartment();
148     
149     user->getUser();
150     user->setUser();
151     department->getDepartment();
152     department->setDepartment();
153 
154     user = DataAccess::createUser();
155     department = DataAccess::createDepartment();
156 
157     user->getUser();
158     user->setUser();
159     department->getDepartment();
160     department->setDepartment();
161 
162     return 0;
163 }