추상 팩토리 패턴

추상팩토리 패턴

예제

추상팩토리는(animal_factory)는 Class 또는 method 그 자체를 받는다.

그리고 추상팩토리를 정의한 클래스 내 메서드 안에서 추상팩토리를 사용한다.

import random

class PetShop:

    def __init__(self, animal_factory=None):
        self.pet_factory = animal_factory

    def show_pet(self):
        pet = self.pet_factory()
        print("We have a lovely {}".format(pet))
        print("It says {}".format(pet.speak()))

class Dog:
    def speak(self):
        return "woof"

    def __str__(self):
        return "Dog"

class Cat:
    def speak(self):
        return "meow"

    def __str__(self):
        return "Cat"

def random_animal():
    return random.choice([Dog, Cat])()

def main():
    shop = PetShop(random_animal)
    shop.show_pet()
        
main()

 

예제

import enum
from abc import *

class Button:
    @abstractmethod
    def Paint(self):
        pass

class WinButton(Button):
    def Paint(self):
        print ("Render a button in a Windows style")

class OSXButton(Button):
    def Paint(self):
        print ("Render a button in a Mac OSX style")

class MousePointer:
    @abstractmethod
    def Paint(self):
        pass

class WinMousePointer(MousePointer):
    def Paint(self):
        print("Render a mousepointer in a Windows style")

class OSXMousePointer(MousePointer):
    def Paint(self):
        print ("Render a mousepointer in a OSX style")

class GUIFactory:
    @abstractmethod
    def CreateButton(self):
        return Button

    @abstractmethod
    def CreateMousePointer(self):
        return MousePointer

class WinFactory(GUIFactory):
    def CreateButton(self):
        return WinButton()
    def CreateMousePointer(self):
        return WinMousePointer()

class OSXFactory(GUIFactory):
    def CreateButton(self):
        return OSXButton()
    def CreateMousePointer(self):
        return OSXMousePointer()

class Settings:
    @staticmethod
    def Default():
        return Appearance.WIN

class Appearance(enum.Enum):
    WIN = 0
    OSX = 1

def main():
    apperance = Settings.Default()
    if apperance == Appearance.WIN:
        factory = WinFactory()
    elif apperance == Appearance.OSX:
        factory = OSXFactory()
    button = factory.CreateButton()
    mousePointer = factory.CreateMousePointer()
    button.Paint()
    mousePointer.Paint()

if __name__ == '__main__':
    main()