# Filename : example.py
# Copyright : 2020 By Bianchenghao6
# Author by : bianchenghao6.com
# Date : 2020-08-22
#又提到了那个快餐点餐系统，不过今天我们只以其中的一个类作为主角：饮料类。首先，回忆下饮料类：
 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
 #除了基本配置，快餐店卖可乐时，可以选择加冰，如果加冰的话，要在原价上加0.3元；
 # 卖牛奶时，可以选择加糖，如果加糖的话，要原价上加0.5元。怎么解决这样的问题？
 # 可以选择装饰器模式来解决这一类的问题。首先，定义装饰器类：
 class drinkDecorator():
     def getName(self):
         pass
     def getPrice(self):
         pass
 class iceDecorator(drinkDecorator):
     def __init__(self, beverage):
         self.beverage = beverage
     def getName(self):
         return self.beverage.getName() + " +ice"
     def getPrice(self):
         return self.beverage.getPrice() + 0.3
 class sugarDecorator(drinkDecorator):
     def __init__(self, beverage):
         self.beverage = beverage
     def getName(self):
         return self.beverage.getName() + " +sugar"
     def getPrice(self):
         return self.beverage.getPrice() + 0.5
 #构建好装饰器后，在具体的业务场景中，就可以与饮料类进行关联。以可乐+冰为例，示例业务场景如下：
 if  __name__=="__main__":
     coke_cola=coke()
     print("Name:%s"%coke_cola.getName())
     print("Price:%s"%coke_cola.getPrice())
     ice_coke=iceDecorator(coke_cola)
     print("Name:%s" % ice_coke.getName())
     print("Price:%s" % ice_coke.getPrice())
 

Name:coke 

 Price:4.0 

 Name:coke +ice 

 Price:4.3