public function TermBreadcrumbBuilder::build

Builds the breadcrumb.

Parameters

\Drupal\Core\Routing\RouteMatchInterface $route_match: The current route match.

Return value

\Drupal\Core\Breadcrumb\Breadcrumb A breadcrumb.

Overrides BreadcrumbBuilderInterface::build

File

core/modules/taxonomy/src/TermBreadcrumbBuilder.php, line 57

Class

TermBreadcrumbBuilder

Provides a custom taxonomy breadcrumb builder that uses the term hierarchy.

Namespace

Code

public function build(RouteMatchInterface $route_match) {
  $breadcrumb = new Breadcrumb();
  $breadcrumb
    ->addLink(Link::createFromRoute($this
    ->t('Home'), '<front>'));
  $term = $route_match
    ->getParameter('taxonomy_term');

  // Breadcrumb needs to have terms cacheable metadata as a cacheable
  // dependency even though it is not shown in the breadcrumb because e.g. its
  // parent might have changed.
  $breadcrumb
    ->addCacheableDependency($term);

  // @todo This overrides any other possible breadcrumb and is a pure
  //   hard-coded presumption. Make this behavior configurable per
  //   vocabulary or term.
  $parents = $this->entityTypeManager
    ->getStorage('taxonomy_term')
    ->loadAllParents($term
    ->id());

  // Remove current term being accessed.
  array_shift($parents);
  foreach (array_reverse($parents) as $term) {
    $term = $this->entityRepository
      ->getTranslationFromContext($term);
    $breadcrumb
      ->addCacheableDependency($term);
    $breadcrumb
      ->addLink(Link::createFromRoute($term
      ->getName(), 'entity.taxonomy_term.canonical', [
      'taxonomy_term' => $term
        ->id(),
    ]));
  }

  // This breadcrumb builder is based on a route parameter, and hence it
  // depends on the 'route' cache context.
  $breadcrumb
    ->addCacheContexts([
    'route',
  ]);
  return $breadcrumb;
}