# Module metric: proportion of Interface Inherited From
#
# Count interfaces that have at least a child
class MIFI
	super MModuleMetric
	super FloatMetric
	redef fun name do return "mifi"
	redef fun desc do return "proportion of interface_kind inherited from"

	redef fun collect(mmodules) do
		for mmodule in mmodules do
			var count = 0
			var nb = 0
			for mclass in mmodule.intro_mclasses do
				if mclass.kind == interface_kind then
					if mclass.in_hierarchy(mainmodule).direct_smallers.length > 0 then count += 1
				end
				nb += 1
			end
			if mmodule.intro_mclasses.is_empty then
				values[mmodule] = 0.0
			else
				values[mmodule] = count.to_f / nb.to_f
			end
		end
	end
end