class Hook:

    def before_navigation(self, planner):
        pass

    def after_navigation(self, planner):
        pass

    def before_route(self, planner):
        pass

    def after_route(self, planner):
        pass

    def before_look_around(self, planner):
        pass

    def after_look_around(self, planner):
        pass
    

    