Created
April 20, 2015 20:29
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class FoodException < Exception | |
end | |
class Food | |
attr_reader :type | |
def initialize(type) | |
@type = type | |
end | |
end | |
class Diet | |
def initialize(acceptable_foods) | |
@acceptable_foods = acceptable_foods | |
end | |
def ensure_edible(food) | |
raise FoodException.new unless @acceptable_foods.include? food.type | |
end | |
end | |
class Animal | |
def initialize(stomach, diet) | |
@stomach = stomach | |
@diet = diet | |
end | |
def eat(food) | |
begin | |
@diet.ensure_edible(food) | |
@stomach.eat(food) | |
puts "Yum" | |
rescue FoodException => e | |
puts "Yuck" | |
end | |
end | |
end | |
class Stomach | |
SMALL = 3 | |
MEDIUM = 5 | |
LARGE = 8 | |
def initialize(size) | |
@size = size | |
@food = [] | |
end | |
def eat(food) | |
raise FoodException.new if @food.length >= size | |
@food << food | |
end | |
end | |
end | |
HerbivoreDiet = Diet.new([:vegtable, :fruit]) | |
small_herbivore = Animal.new(Stomach.new(Stomach::SMALL), HerbivoreDiet)) |
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