chapter 3

Author: rebuild-123

decorator/io/I don't know how to implement it in python.txt

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+I don't know how to implement it in python.

decorator/pizza/Cheese.py

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+from Pizza import Pizza
+from ToppingDecorator import ToppingDecorator
+
+
+class Cheese(ToppingDecorator):
+ def __init__(self, pizza: Pizza):
+ self.pizza = pizza
+ 
+ def getDescription(self) -> str:
+ return self.pizza.getDescription() + ", Cheese"
+ 
+ def cost(self) -> float:
+ return self.pizza.cost() # cheese is free

decorator/pizza/Olives.py

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+from Pizza import Pizza
+from ToppingDecorator import ToppingDecorator
+
+
+class Olives(ToppingDecorator):
+ def __init__(self, pizza: Pizza):
+ self.pizza = pizza
+ 
+ def getDescription(self) -> str:
+ return self.pizza.getDescription() + ", Olives"
+ 
+ def cost(self) -> float:
+ return self.pizza.cost() + 0.30

decorator/pizza/Pizza.py

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+from abc import ABC, abstractmethod
+
+
+class Pizza(ABC):
+ description: str = "Basic Pizza"
+ 
+ def getDescription(self) -> str:
+ return self.description
+ 
+ @abstractmethod
+ def cost(self) -> float:
+ raise NotImplementedError

decorator/pizza/PizzaStore.py

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+from Cheese import Cheese
+from Olives import Olives
+from Pizza import Pizza
+from ThincrustPizza import ThincrustPizza
+
+
+class PizzaStore:
+ @staticmethod
+ def main(*args) -> None:
+ pizza: Pizza = ThincrustPizza()
+ cheesePizza: Pizza = Cheese(pizza)
+ greekPizza: Pizza = Olives(cheesePizza)
+ 
+ print(f'{greekPizza.getDescription()} ${greekPizza.cost()}')
+ 
+if __name__ == '__main__':
+ PizzaStore.main()

decorator/pizza/ThickcrustPizza.py

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+from Pizza import Pizza
+
+
+class ThickcrustPizza(Pizza):
+ def __init__(self):
+ self.description = "Thick crust pizza, with tomato sauce"
+ 
+ def cost(self) -> float:
+ return 7.99

decorator/pizza/ThincrustPizza.py

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+from Pizza import Pizza
+
+
+class ThincrustPizza(Pizza):
+ def __init__(self):
+ self.description = "Thin crust pizza, with tomato sauce"
+ 
+ def cost(self) -> float:
+ return 7.99

decorator/pizza/ToppingDecorator.py

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+from abc import abstractmethod
+
+from Pizza import Pizza
+
+
+class ToppingDecorator(Pizza):
+ pizza: Pizza
+ 
+ @abstractmethod
+ def getDescription(self) -> str:
+ raise NotImplementedError

decorator/starbuzz/Beverage.py

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+from abc import ABC, abstractmethod
+
+
+class Beverage(ABC):
+ description: str = "Unknown Beverage"
+ 
+ def getDescription(self) -> str:
+ return self.description
+ 
+ @abstractmethod
+ def cost(self) -> float:
+ raise NotImplementedError

decorator/starbuzz/CondimentDecorator.py

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+from abc import ABC, abstractmethod
+
+from Beverage import Beverage
+
+
+class CondimentDecorator(Beverage):
+ beverage: Beverage
+ 
+ @abstractmethod
+ def getDescription(self) -> str:
+ raise NotImplementedError