簡(jiǎn)單工廠模式

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基于一個(gè)包含do_say()方法的Animal的抽象類創(chuàng)建兩個(gè)類

• Cat
• Dog

from abc import ABCMeta, abstractmethod

class Animal(metaclass=ABCMeta):
    @abstractmethod
    def do_say(self):
        pass


class Dog(Animal):
    def do_say(self):
        print("Bhow Bhow!!")


class Cat(Animal):
    def do_say(self):
        print("Meow Meow!!")

創(chuàng)建一個(gè)包含make_sound()方法的工廠類ForestFactory

class ForestFactory(object):
    def make_sound(self, object_type):
        return eval(object_type)().do_say()

制造點(diǎn)聲音

if __name__ == '__main__':
    ff = ForestFactory()
    animal = input("Which animal should make_sound?[Dog or Cat]")
    ff.make_sound(animal)

運(yùn)行結(jié)果

類關(guān)系圖

類關(guān)系圖

工廠方法模式

有兩個(gè)社交網(wǎng)站LinkedIn和Facebook历葛，它們的個(gè)人簡(jiǎn)介界面有各自不同的內(nèi)容

內(nèi)容抽象類Section

from abc import ABCMeta, abstractmethod


class Section(metaclass=ABCMeta):
    @abstractmethod
    def describe(self):
        pass

不同的內(nèi)容

• PersonalSection
• AlbumSection
• PatenSection
• PublicationSection

class PersonalSection(Section):
    def describe(self):
        print("Personal Section")


class AlbumSection(Section):
    def describe(self):
        print("Album Section")


class PatenSection(Section):
    def describe(self):
        print("Patent Section")


class PublicationSection(Section):
    def describe(self):
        print("Publication Section")

公司抽象類Profile

class Profile(metaclass=ABCMeta):
    def __init__(self):
        self.sections = []
        self.createProfile()

    @abstractmethod
    def createProfile(self):
        pass

    def getSections(self):
        return self.sections

    def addSections(self, section):
        self.sections.append(section)

公司類

• linkedin
• facebook

class linkedin(Profile):
    def createProfile(self):
        self.addSections(PersonalSection())
        self.addSections(PatenSection())
        self.addSections(PublicationSection())


class facebook(Profile):
    def createProfile(self):
        self.addSections(PersonalSection())
        self.addSections(AlbumSection())

選擇一個(gè)社交網(wǎng)站

if __name__ == '__main__':
    profile_type = input("Which Profile you`d like to create?[LinkedIn or FaceBook]")
    profile = eval(profile_type.lower())()
    print("Creating Profile..", type(profile).__name__)
    print("Profile has sections --", profile.getSections())

測(cè)試結(jié)果

類關(guān)系圖

工廠方法模式

抽象工廠模式

一家提供印式和美式披薩的店（抽象類PizzFactory）

class PizzFactory(metaclass=ABCMeta):
    @abstractmethod
    def createVegPizza(self):
        pass

    @abstractmethod
    def createNonVegPizza(self):
        pass

• IndianPizzaFactory
• USPizzaFactory

class IndianPizzaFactory(PizzFactory):
    def createVegPizza(self):
        return DeluxVeggiePizza()

    def createNonVegPizza(self):
        return ChickenPizza()


class USPizzaFactory(PizzFactory):
    def createVegPizza(self):
        return MexicanVegPizza()

    def createNonVegPizza(self):
        return HamPizza()

兩種不同的披薩(抽象類)

• 素食披薩NonVegPizza
• 非素食披薩VegPizza

class VegPizza(metaclass=ABCMeta):
    @abstractmethod
    def prepare(self):
        pass


class NonVegPizza(metaclass=ABCMeta):
    @abstractmethod
    def serve(self, VegPizza):
        pass

四種不同的披薩

• DeluxVeggiePizza
• ChickenPizza
• MexicanVegPizza
• HamPizza

class DeluxVeggiePizza(VegPizza):
    def prepare(self):
        print("Prepare ", type(self).__name__)


class ChickenPizza(NonVegPizza):
    def serve(self, VegPizza):
        print(type(self).__name__, " is served with Chicken on", type(VegPizza).__name__)


class MexicanVegPizza(VegPizza):
    def prepare(self):
        print("Prepare ", type(self).__name__)


class HamPizza(NonVegPizza):
    def serve(self, VegPizza):
        print(type(self).__name__, " is served with Ham on", type(VegPizza).__name__)

到此就完成了一家披薩店肢预，有兩個(gè)國(guó)家口味，各有葷素的披薩。

整合為一個(gè)制造披薩的工廠

class PizzaStore:
    def __init__(self):
        pass

    def makePizzas(self):
        for factory in [IndianPizzaFactory(), USPizzaFactory()]:
            self.factory = factory
            self.NonVegPizza = self.factory.createNonVegPizza()
            self.VegPizza = self.factory.createVegPizza()
            self.VegPizza.prepare()
            self.NonVegPizza.serve(self.VegPizza)

測(cè)試

if __name__ == '__main__':
    pizza = PizzaStore()
    pizza.makePizzas()

測(cè)試結(jié)果

類關(guān)系圖

類關(guān)系圖

工廠方法和抽象工廠方法