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class Pie
def make
add_main_ingredient
add_secondary_ingredients
cook
add_toppings
let_cool
end
def add_ingredient(ingredient)
@ingredients << ingredient
end
def oven_time
25 # Default implementation for the oven time to make a generic pie.
end
def add_toppings
# This is a hook method.
# Since your concrete pie might or might not include toppings, this is empty for the subclasses to implement it if needed.
end
def cook
put_in_oven
wait_for_minutes(self.oven_time) # Asks for the oven time for the concrete pie.
take_out_from_oven
end
def let_cool
wait_for_minutes(30)
end
end
class ApplePie < Pie
def add_main_ingredient
add_ingredient(:apples)
end
def add_secondary_ingredients
add_ingredient(:sugar)
end
def add_toppings
add_ingredient(:apple_slices) # This hook method is defined by the ApplePie, but not by the MeatPie since it's not needed.
end
def oven_time
20 # We override the default implementation received by inheriting from Pie.
end
end
class MeatPie < Pie
def add_main_ingredient
add_ingredient(:grounded_meat)
end
def add_secondary_ingredients
add_ingredient(:salt)
add_ingredient(:pepper)
end
def oven_time
35 # We override the default implementation received by inheriting from Pie.
end
end
MeatPie.make
ApplePie.make
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