#encoding=utf-8
#
#by panda
#抽象工廠模式


def printInfo(info):
    print unicode(info, 'utf-8').encode('gbk')
    
#抽象產品A：user表
class IUser():
    def Insert(self):
        pass
    def GetUser(self):
        pass

#sqlserver實現的User
class SqlserverUser(IUser):
    def Insert(self):
        printInfo("在SQL Server中給User表增加一條記錄")
    def GetUser(self):
        printInfo("在SQL Server中得到User表的一條記錄")

#Access實現的User
class AccessUser(IUser):
    def Insert(self):
        printInfo("在Access中給User表增加一條記錄")
    def GetUser(self):
        printInfo("在Access中得到User表一條記錄")


#抽象產品B：部門表
class IDepartment():
    def Insert(self):
        pass
    def GetUser(self):
        pass

#sqlserver實現的Department
class SqlserverDepartment(IUser):
    def Insert(self):
        printInfo("在SQL Server中給Department表增加一條記錄")
    def GetUser(self):
        printInfo("在SQL Server中得到Department表的一條記錄")

#Access實現的Department
class AccessDepartment(IUser):
    def Insert(self):
        printInfo("在Access中給Department表增加一條記錄")
    def GetUser(self):
        printInfo("在Access中得到Department表一條記錄")


#抽象工廠
class IFactory():
    def CreateUser(self):
        pass
    def CreateDepartment(self):
        pass    

#sql server工廠
class SqlServerFactory(IFactory):
    def CreateUser(self):
        return SqlserverUser()
    def CreateDepartment(self):
        return SqlserverDepartment()

#access工廠
class AccessFactory(IFactory):
    def CreateUser(self):
        return AccessUser()
    def CreateDepartment(self):
        return AccessDepartment()
    
#優化一：採用一個簡單工廠類，封裝邏輯判斷操作
class DataAccess():
#    db = "Sqlserver"
    db = "Access"
    @staticmethod
    def CreateUser():
        if (DataAccess.db == "Sqlserver"):
            return SqlserverUser()
        elif(DataAccess.db == "Access"):
            return AccessUser()
    @staticmethod
    def CreateDepartment():
        if (DataAccess.db == "Sqlserver"):
            return SqlserverDepartment()
        elif(DataAccess.db == "Access"):
            return AccessDepartment()
        
#優化二：採用反射機制，避免使用太多判斷
##以下資訊可以從配置檔案中獲取
DBType = 'Sqlserver' #'Access'
DBTab_User = 'User'
DBTab_Department = 'Department'

class DataAccessPro():
#    db = "Sqlserver"
    db = "Access"
    @staticmethod
    def CreateUser():
        funName = DBType + DBTab_User
        return eval(funName)()  #eval 將其中的字串轉化為python表示式
    @staticmethod
    def CreateDepartment():
        funName = DBType + DBTab_Department
        return eval(funName)()
        
def clientUI():
    printInfo("\n--------抽象工廠方法--------")
    factory = SqlServerFactory()
    iu = factory.CreateUser()
    iu.Insert()
    iu.GetUser()
    id = factory.CreateDepartment()
    id.Insert()
    id.GetUser()
    
    printInfo("\n--抽象工廠方法+簡單工廠方法--")
    iu = DataAccess.CreateUser()
    iu.Insert()
    iu.GetUser()
    id = DataAccess.CreateDepartment()
    id.Insert()
    id.GetUser()
    
    printInfo("\n-抽象工廠方法+簡單工廠方法+反射-")
    iu = DataAccessPro.CreateUser()
    iu.Insert()
    iu.GetUser()
    id = DataAccessPro.CreateDepartment()
    id.Insert()
    id.GetUser()    
    return


if __name__ == '__main__':
    clientUI();
 

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