python-patterns/adapter.py at master · Problematic/python-patterns · GitHub

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# http://ginstrom.com/scribbles/2008/11/06/generic-adapter-class-in-python/

import os

class Dog(object):

def __init__(self):

self.name = "Dog"

def bark(self):

return "woof!"

class Cat(object):

def __init__(self):

self.name = "Cat"

def meow(self):

return "meow!"

class Human(object):

def __init__(self):

self.name = "Human"

def speak(self):

return "'hello'"

class Car(object):

def __init__(self):

self.name = "Car"

def make_noise(self, octane_level):

return "vroom%s" % ("!" * octane_level)

class Adapter(object):

"""

Adapts an object by replacing methods.

Usage:

dog = Dog

dog = Adapter(dog, dict(make_noise=dog.bark))

"""

def __init__(self, obj, adapted_methods):

"""We set the adapted methods in the object's dict"""

self.obj = obj

self.__dict__.update(adapted_methods)

def __getattr__(self, attr):

"""All non-adapted calls are passed to the object"""

return getattr(self.obj, attr)

def main():

objects = []

dog = Dog()

objects.append(Adapter(dog, dict(make_noise=dog.bark)))

cat = Cat()

objects.append(Adapter(cat, dict(make_noise=cat.meow)))

human = Human()

objects.append(Adapter(human, dict(make_noise=human.speak)))

car = Car()

car_noise = lambda : car.make_noise(3)

objects.append(Adapter(car, dict(make_noise=car_noise)))

for obj in objects:

print("A", obj.name, "goes", obj.make_noise())

if __name__ == "__main__":

main()

python-patterns/adapter.py at master · Problematic/python-patterns · GitHub

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