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add python-design-patter-builder
#! -*- coding: utf-8 -*-
"""
建造者模式
"""
import time
STEP_DELAY = 0.1
PIZZA_PROGRESS = ['prepare', 'bake', 'cut', 'box']
class Pizza:
def __init__(self, name):
self.name = name
self.dough = None
self.sauce = None
self.toppings = []
def prepare_dough(self, dough):
self.dough = dough
print(self.dough)
print('preparing the {} dough of your {}...'.format(self.dough, self))
time.sleep(STEP_DELAY)
print('Done with the {} dough'.format(self.dough))
def __str__(self):
return self.name
class PizzaBuilder(object):
name = None
def __init__(self):
self.progress = PIZZA_PROGRESS
self.baking_time = 5
def prepare_dough(self):
raise NotImplementedError()
def add_sauce(self):
raise NotImplementedError()
def add_topping(self):
raise NotImplementedError()
def bake(self):
raise NotImplementedError()
def cut(self):
raise NotImplementedError()
def box(self):
raise NotImplementedError()
@property
def pizza(self):
return Pizza(self.name)
class NYStyleCheeseBuilder(PizzaBuilder):
name = 'NY Style Sauce and Cheese Pizza'
def prepare_dough(self):
self.progress = PIZZA_PROGRESS[0]
self.pizza.prepare_dough('thin')
def add_sauce(self):
print('adding the tomato sauce to your pizza..')
self.pizza.sauce = 'tomato'
time.sleep(STEP_DELAY)
print('done with the tomato sauce')
def add_topping(self):
print('adding the topping (grated reggiano cheese) to your pizza')
self.pizza.toppings.append(["Grated", "Reggiano", "Cheese"])
time.sleep(STEP_DELAY)
print('done with the topping (grated reggiano cheese)')
def bake(self):
self.progress = PIZZA_PROGRESS[1]
print('baking your pizza for {} seconds'.format(self.baking_time))
time.sleep(self.baking_time)
def cut(self):
self.progress = PIZZA_PROGRESS[2]
print("Cutting the pizza into diagonal slices")
def box(self):
self.progress = PIZZA_PROGRESS[3]
print("Place pizza in official PizzaStore box")
class ChicagoStyleCheeseBuilder(PizzaBuilder):
name = 'Chicago Style Deep Dish Cheese Pizza'
def prepare_dough(self):
self.progress = PIZZA_PROGRESS[0]
self.pizza.prepare_dough('cheese')
def add_sauce(self):
print('adding the dish sauce to your pizza..')
self.pizza.sauce = 'dish'
time.sleep(STEP_DELAY)
print('done with the dish sauce')
def add_topping(self):
print('adding the topping (Shredded, Mozzarella, Cheese) to your pizza')
self.pizza.toppings.append(["Shredded", "Mozzarella", "Cheese"])
time.sleep(STEP_DELAY)
print('done with the topping (Shredded, Mozzarella, Cheese)')
def bake(self):
self.progress = PIZZA_PROGRESS[1]
print('baking your pizza for {} seconds'.format(self.baking_time))
time.sleep(self.baking_time)
def cut(self):
self.progress = PIZZA_PROGRESS[2]
print("Cutting the pizza into diagonal slices")
def box(self):
self.progress = PIZZA_PROGRESS[3]
print("Place pizza in official PizzaStore box")
class Waiter:
# 指挥者
def __init__(self):
self.builder = None
def construct_pizza(self, builder):
self.builder = builder
# 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
[step() for step in (builder.prepare_dough, builder.add_sauce,
builder.add_topping, builder.bake,
builder.cut, builder.box)]
@property
def pizza(self):
return self.builder.pizza
def validate_style(builders):
try:
pizza_style = input('What pizza would you like, [N]YStyleCheesePizza or [C]hicagoStyleCheesePizza?')
builder = builders[pizza_style]
except KeyError as err:
print('Sorry, only NYStyleCheesePizza and ChicagoStyleCheesePizza are avaliable')
return False, None
return True, builder
def main():
builders = dict(N=NYStyleCheeseBuilder, C=ChicagoStyleCheeseBuilder)
valid_input = False
while not valid_input:
valid_input, builder = validate_style(builders)
waiter = Waiter()
waiter.construct_pizza(builder())
pizza = waiter.pizza
print('Enjoy your {}!'.format(pizza))
if __name__ == '__main__':
main()
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