interface ParamConverterManagerInterface

interface ParamConverterManagerInterface {
    
    /**
     * Registers a parameter converter with the manager.
     *
     * @param \Drupal\Core\ParamConverter\ParamConverterInterface $param_converter
     *   The added param converter instance.
     * @param string $id
     *   The parameter converter service id to register.
     *
     * @return $this
     */
    public function addConverter(ParamConverterInterface $param_converter, $id);
    
    /**
     * Lazy-loads converter services.
     *
     * @param string $id
     *   The service id of converter service to load.
     *
     * @return \Drupal\Core\ParamConverter\ParamConverterInterface
     *   The loaded converter service identified by the given service id.
     *
     * @throws \InvalidArgumentException
     *   If the given service id is not a registered converter.
     */
    public function getConverter($id);
    
    /**
     * Saves a list of applicable converters to each route.
     *
     * @param \Symfony\Component\Routing\RouteCollection $routes
     *   A collection of routes to apply converters to.
     */
    public function setRouteParameterConverters(RouteCollection $routes);
    
    /**
     * Invokes the registered converter for each defined parameter on a route.
     *
     * @param array $defaults
     *   The route defaults array.
     *
     * @return array
     *   The modified defaults.
     *
     * @throws \Drupal\Core\ParamConverter\ParamNotConvertedException
     *   If one of the assigned converters returned NULL because the given
     *   variable could not be converted.
     */
    public function convert(array $defaults);

}