class Ordering:
    ''' Contains ordering functions '''

    @staticmethod
    def ByName(image_a, image_b):
        keymaker = GLib.utf8_collate_key_for_filename
        key_a = keymaker(image_a.fullname, len(image_a.fullname))
        key_b = keymaker(image_b.fullname, len(image_b.fullname))
        return cmp(key_a, key_b)