Design Pattern - Builder

dp_bulider.md

Builder

The builder pattern can be used for constructing complex objects with many configurable options.

The benefit of the Builder Pattern is that it allows for the creation of complex objects step by step, providing a clear and flexible way to configure and construct objects with varying attributes and options.

class Pizza:
    def __init__(self):
        self.size = None
        self.cheese = False
        self.pepperoni = False
        self.bacon = False

    def __str__(self):
        toppings = []
        if self.cheese:
            toppings.append("cheese")
        if self.pepperoni:
            toppings.append("pepperoni")
        if self.bacon:
            toppings.append("bacon")

        return f"Size: {self.size}, Toppings: {', '.join(toppings)}"

class PizzaBuilder:
    def __init__(self):
        self.pizza = Pizza()

    def set_size(self, size):
        self.pizza.size = size
        return self

    def add_cheese(self):
        self.pizza.cheese = True
        return self

    def add_pepperoni(self):
        self.pizza.pepperoni = True
        return self

    def add_bacon(self):
        self.pizza.bacon = True
        return self

    def build(self):
        return self.pizza

# Client code
builder = PizzaBuilder()
pizza = builder.set_size("Large").add_cheese().add_pepperoni().build()
print(pizza)