python 设计模式之建造者模式

python 建造者模式
例：以快餐点餐系统来阐述这个模式，从订单的角度来构造这个系统
1.汉堡以2种为例

class Burger(object):
    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

2.小食

class Snack(object):
    name = ""
    price = 0.0
    type = 'SNACK'

    def getPrice(self):
        return self.price

    def setPrice(self, price):
        self.pirce = 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.name = "chicken wings"
        self.price = 12.0

3.饮料

class Beverage(object):
    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


class order():
    burger = ""
    snack = ""
    beverage = ""

    def __init__(self, orderBuilder):
        self.burger = orderBuilder.bBurger
        self.snack = orderBuilder.bSnack
        self.beverage = orderBuilder.bBeverage


    def show(self):
        print("Burger:%s" % self.burger.getName())
        print("Snack:%s" % self.snack.getName())
        print("Beverage:%s" % self.beverage.getName())


class orderBuilder():
    bBurger = ""
    bSnack = ""
    bBeverage = ""

    def addBurger(self, xBurger):
        self.bBurger = xBurger

    def addSnack(self, xSnack):
        self.bSnack = xSnack

    def addBeverage(self, xBeverage):
        self.bBeverage = xBeverage

    def build(self):
        return order(self)


if __name__ == '__main__':
    order_builder = orderBuilder()
    order_builder.addBurger(spicyChickenBurger())
    order_builder.addSnack(chips())
    order_builder.addBeverage(milk())
    order_1 = order_builder.build()
    order_1.show()
  
#打印结果：
Burger:spicy chicken burger
Snack:chips
Beverage:milk