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abstract_factory.lua
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/
abstract_factory.lua
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require('_class')
math.randomseed(os.time())
local PetShop = class()
function PetShop:ctor(animal_factory)
self.pet_factory = animal_factory
end
function PetShop:show_pet()
local pet = self.pet_factory:get_pet()
print(string.format("We have a lovely %s", pet:get_name()))
print(string.format("It says %s", pet:speak()))
print(string.format("We also have %s", self.pet_factory:get_food()))
end
-- Pet Class
local Dog = class()
function Dog:speak()
return "woof"
end
function Dog:get_name()
return "Dog"
end
local Cat = class()
function Cat:speak()
return "meow"
end
function Cat:get_name()
return "Cat"
end
-- Factory Class
local DogFactory = class()
function DogFactory:get_pet()
return Dog.new()
end
function DogFactory:get_food()
return "dog food"
end
local CatFactory = class()
function CatFactory:get_pet()
return Cat.new()
end
function CatFactory:get_food()
return "cat food"
end
-- Create the proper family
local factories_ = {DogFactory, CatFactory}
local function random_factory()
return factories_[math.random(2)]
end
for i = 1, 3 do
local shop = PetShop.new(random_factory())
shop:show_pet()
print("---------------------")
end
---------------------------------------------------------------------------
-- OUTPUT
---------------------------------------------------------------------------
-- We have a lovely Dog
-- It says woof
-- We also have dog food
-- ---------------------
-- We have a lovely Cat
-- It says meow
-- We also have cat food
-- ---------------------
-- We have a lovely Dog
-- It says woof
-- We also have dog food
-- ---------------------