def METHOD_NAME(self, rel_cls_name, object_class_name_list):
    display_icon = self.display_icons.get(rel_cls_name)
    if display_icon is not None:
        return self.class_renderer(rel_cls_name)
    if object_class_name_list not in self._rel_cls_renderers:
        self._create_rel_cls_renderer(object_class_name_list)
    return self._rel_cls_renderers[object_class_name_list]