123 lines
3.5 KiB
Python
123 lines
3.5 KiB
Python
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from abc import ABC, abstractmethod
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class Car:
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def __init__(self):
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self.seats = None
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self.engine = None
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self.trip_computer = None
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self.gps = None
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def __str__(self):
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return (f"Car with {self.seats} seats, {self.engine} engine, "
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f"trip computer: {self.trip_computer}, GPS: {self.gps}")
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class CarManual:
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def __init__(self):
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self.seats = None
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self.engine = None
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self.trip_computer = None
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self.gps = None
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def __str__(self):
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return (f"Car manual:\nSeats: {self.seats}\nEngine: {self.engine}\n"
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f"trip computer: {self.trip_computer}\nGPS: {self.gps}")
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class Builder(ABC):
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@abstractmethod
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def reset(self):
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pass
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@abstractmethod
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def set_seats(self, number):
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pass
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@abstractmethod
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def set_engine(self, engine_type):
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pass
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@abstractmethod
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def set_trip_computer(self, has_trip_computer):
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pass
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@abstractmethod
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def set_gps(self, has_gps):
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pass
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@abstractmethod
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def get_result(self):
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pass
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class CarBuilder(Builder):
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def __init__(self):
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self.reset()
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def reset(self):
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self._car = Car()
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return self
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def set_seats(self, number):
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self._car.seats = number
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return self
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def set_engine(self, engine_type):
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self._car.engine = engine_type
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return self
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def set_trip_computer(self, has_trip_computer):
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self._car.trip_computer = has_trip_computer
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return self
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def set_gps(self, has_gps):
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self._car.gps = has_gps
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return self
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def get_result(self):
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car = self._car
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self.reset()
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return car
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class CarManualBuilder(Builder):
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def __init__(self):
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self.reset()
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def reset(self):
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self._manual = CarManual()
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return self
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def set_seats(self, number):
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self._manual.seats = f"{number} seats"
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return self
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def set_engine(self, engine_type):
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self._manual.engine = f"engine type: {engine_type}"
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return self
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def set_trip_computer(self, has_trip_computer):
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self._manual.trip_computer = "Equipped with a trip computer" if has_trip_computer else "No trip computer"
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return self
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def set_gps(self, has_gps):
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self._manual.gps = "includes GPS navigation" if has_gps else "No GPS navigation"
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return self
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def get_result(self):
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manual = self._manual
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self.reset()
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return manual
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class Director:
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def __init__(self, builder: Builder):
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self._builder = builder
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def set_builder(self, builder: Builder):
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self._builder = builder
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def construct_sport_car(self):
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self._builder.reset()
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self._builder.set_seats(2)
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self._builder.set_engine("V8")
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self._builder.set_trip_computer(True)
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self._builder.set_gps(True)
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def construct_suv(self):
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self._builder.reset()
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self._builder.set_seats(7)
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self._builder.set_engine("V6")
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self._builder.set_trip_computer(True)
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self._builder.set_gps(False)
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director = Director(CarBuilder())
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director.construct_sport_car()
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print(director._builder.get_result())
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director.set_builder(CarManualBuilder())
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director.construct_sport_car()
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print(director._builder.get_result())
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director.set_builder(CarBuilder())
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director.construct_suv()
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print(director._builder.get_result())
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director.set_builder(CarManualBuilder())
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director.construct_suv()
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print(director._builder.get_result())
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