创建类设计模式-工厂类相关模式

"""
一、快餐点餐系统
点餐系统，有三类可选择产品，主餐，小食，饮料。我们可以任意选择，下单，支付完成之后，订单完成。
工厂模式-生成这些食物的逻辑主题


"""

class Burger():
    name = ""
    price = 0.0

    def getPrice(self):
        return self.price

    def setPrice(self, price):
        self.price = price

    def getName(self):
        return self.name


class cheeseBurger(Burger):
    def __init__(self):
        self.name = "cheese burger"
        self.price = 10.0


class spicychickenBurger(Burger):

    def __init__(self):
        self.name = "spicy chicken burger"

        self.price = 15.0

class Snack():
    name = ""
    price = 0.0

    type = "SNACK"

    def getPrice(self):
        return self.price

    def setPrice(self, price):
        self.price = price

    def getName(self):
        return self.name


class chips(Snack):

    def __init__(self):
        self.name = "chips"
        self.price = 6.0


class chickenwings(Snack):

    def __init__(self):
        self.anme = "chickenwings"
        self.pric = 12.0

class Beverage():
    name = ""
    price = 0.0
    type = "BEVERAGE"

    def getPrice(self):
        return self.price

    def setPrice(self, price):
        self.price = price

    def getName(self):
        return self.name


class coke(Beverage):
    def __init__(self):
        self.name = "coke"
        self.price = 4.0


class milk(Beverage):
    def __init__(self):
        self.name = "milk"
        self.price = 5.0

"""
以上的Burger，Snack，Beverage，都可以认为是该快餐店的产品，由于只提供了抽象方法，我们把它们叫抽象产品类，
而cheese burger等6个由抽象产品类衍生出的子类，叫作具体产品类。
接下来，“工厂”就要出现了。

"""

class FoodFactory():
    type = ""

    def createFood(self, foodClass):
        print(self.type, " factory produce a instance.")
        foodIns = foodClass()
        return foodIns


class burgerFactory(FoodFactory):
    def __init__(self):
        self.type = "BURGER"


class snackFactory(FoodFactory):
    def __init__(self):
        self.type = "SNACK"


class bevergeFactory(FoodFactory):

    def __init__(self):
        self.type = "BEVERAGE"


"""
同样，foodFactory为抽象的工厂类，
而burgerFactory，snackFactory，beverageFactory为具体的工厂类。

"""

if __name__=="__main__":
    burgerF=burgerFactory()
    snackF=snackFactory()
    beverage_factory = bevergeFactory()
    cheese_burger = beverage_factory.createFood(cheeseBurger)
    print(cheese_burger.getName(), cheese_burger.getPrice())
    chicken_wings = snackF.createFood(chickenwings)
    print(chicken_wings.getName(), chicken_wings.getPrice())
    coke_drink = beverage_factory.createFood(coke)
    print(coke_drink.getName(),coke_drink.getPrice())

BEVERAGE  factory produce a instance.
cheese burger 10.0
SNACK  factory produce a instance.
 0.0
BEVERAGE  factory produce a instance.
coke 4.0