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python设计模式-抽象工厂模式
#! -*- coding: utf-8 -*-
"""
抽象工厂模式
"""
# 原料
class FreshClams:
def __str__(self):
return 'Fresh Clams'
class MarinaraSauce:
def __str__(self):
return "Marinara Sauce"
class ThickCrustDough:
def __str__(self):
return "Thick Crust Dough"
class ReggianoCheese:
def __str__(self):
return "Reggiano Cheese"
class SlicedPepperoni:
def __str__(self):
return "Sliced Pepperoni"
class Garlic:
def __str__(self):
return "Garlic"
class Onion:
def __str__(self):
return "Onion"
class RedPepper:
def __str__(self):
return "Red Pepper"
class PizzaIngredientFactory:
'''
定义原料工厂
'''
def create_dough(self):
raise NotImplementedError()
def create_sauce(self):
raise NotImplementedError()
def create_cheese(self):
raise NotImplementedError()
def create_pepperoni(self):
raise NotImplementedError()
def create_clam(self):
raise NotImplementedError()
def create_veggies(self):
raise NotImplementedError()
class NYPizzaIngredientFactory(PizzaIngredientFactory):
def create_dough(self):
print("Tossing %s" % ThickCrustDough())
return ThickCrustDough()
def create_sauce(self):
print("Adding %s..." % MarinaraSauce())
return MarinaraSauce()
def create_cheese(self):
print("Adding %s..." % ReggianoCheese())
return ReggianoCheese()
def create_pepperoni(self):
print("Adding %s..." % SlicedPepperoni())
return SlicedPepperoni()
def create_clam(self):
print("Adding %s..." % FreshClams())
return FreshClams()
def create_veggies(self):
veggies = [Garlic(), Onion(), RedPepper()]
for veggie in veggies:
print(" %s" % veggie)
return veggies
class Pizza:
'''
pizza 工厂
'''
dough = None
sauce = None
cheese = None
veggies = []
pepperoni = None
clam = None
def __init__(self, name, ingredient_factory):
self.name = name
self.ingredient_factory = ingredient_factory
def prepare(self):
raise NotImplementedError()
def bake(self):
print("Bake for 25 minutes at 350")
def cut(self):
print("Cutting the pizza into diagonal slices")
def box(self):
print("Place pizza in official PizzaStore box")
def __str__(self):
return self.name
class NYStyleCheesePizza(Pizza):
def prepare(self):
dough = self.ingredient_factory.create_dough()
sauce = self.ingredient_factory.create_sauce()
cheese = self.ingredient_factory.create_cheese()
clam = self.ingredient_factory.create_clam()
veggies = self.ingredient_factory.create_veggies()
class NYStyleClamPizza(Pizza):
def prepare(self):
dough = self.ingredient_factory.create_dough()
sauce = self.ingredient_factory.create_sauce()
cheese = self.ingredient_factory.create_cheese()
clam = self.ingredient_factory.create_clam()
class PizzaStore:
'''
pizza 店工厂
'''
ingredient_factory = None
def create_pizza(self, pizza_type):
# 每个需要子类实现的方法都会抛出NotImplementedError
# 我们也可以把 PizzaStore 的 metaclass 设置成 abc.ABCMeta
# 这样的话,这个类就是真正的抽象基类
raise NotImplementedError()
def order_pizza(self, pizza_type): # 现在把 pizza 的类型传入 order_pizza()
pizza = self.create_pizza(pizza_type)
# 一旦我们有了一个 pizza,需要做一些准备(擀面皮、加佐料),然后烘烤、切片、装盒
pizza.prepare()
pizza.bake()
pizza.cut()
pizza.box()
return pizza
# 下边是其他可能用到的方法
class NYStylePizzStore(PizzaStore):
ingredient_factory = NYPizzaIngredientFactory()
def create_pizza(self, pizza_type):
# 根据 pizza 类型,我们实例化正确的具体类,然后将其赋值给 pizza 实例变量
if pizza_type == 'cheese':
pizza = NYStyleCheesePizza('NY Style Sauce and Cheese Pizza',
self.ingredient_factory)
elif pizza_type == 'clam':
pizza = NYStyleClamPizza('NY Style Clam Pizza',
self.ingredient_factory)
return pizza
def main():
nystore = NYStylePizzStore()
pizza = nystore.order_pizza('cheese')
print('*' * 10)
print("goodspeed ordered a %s" % pizza)
print('*' * 10)
if __name__ == '__main__':
main()
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