class HelpBreadcrumbBuilder

class HelpBreadcrumbBuilder implements BreadcrumbBuilderInterface {
    
    /**
     * {@inheritdoc}
     */
    public function applies(RouteMatchInterface $route_match) {
        return $route_match->getRouteName() == 'help.help_topic';
    }
    
    /**
     * {@inheritdoc}
     */
    public function build(RouteMatchInterface $route_match) {
        $breadcrumb = new Breadcrumb();
        $breadcrumb->addCacheContexts([
            'url.path.parent',
        ]);
        $breadcrumb->addLink(Link::createFromRoute(new TranslatableMarkup('Home'), '<front>'));
        $breadcrumb->addLink(Link::createFromRoute(new TranslatableMarkup('Administration'), 'system.admin'));
        $breadcrumb->addLink(Link::createFromRoute(new TranslatableMarkup('Help'), 'help.main'));
        return $breadcrumb;
    }

}