class InaccessibleMenuLink

class InaccessibleMenuLink extends MenuLinkBase {
    
    /**
     * The wrapped menu link.
     *
     * @var \Drupal\Core\Menu\MenuLinkInterface
     */
    protected $wrappedLink;
    
    /**
     * Constructs a new InaccessibleMenuLink.
     *
     * @param \Drupal\Core\Menu\MenuLinkInterface $wrapped_link
     *   The menu link to wrap.
     */
    public function __construct(MenuLinkInterface $wrapped_link) {
        $this->wrappedLink = $wrapped_link;
        $plugin_definition = [
            'route_name' => '<front>',
            'route_parameters' => [],
            'url' => NULL,
        ] + $this->wrappedLink
            ->getPluginDefinition();
        parent::__construct([], $this->wrappedLink
            ->getPluginId(), $plugin_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTitle() {
        return $this->t('Inaccessible');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        return '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        return $this->wrappedLink
            ->getCacheContexts();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheTags() {
        return $this->wrappedLink
            ->getCacheTags();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheMaxAge() {
        return $this->wrappedLink
            ->getCacheMaxAge();
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateLink(array $new_definition_values, $persist) {
        throw new PluginException('Inaccessible menu link plugins do not support updating');
    }

}