public function BookBreadcrumbBuilder::build in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/book/src/BookBreadcrumbBuilder.php \Drupal\book\BookBreadcrumbBuilder::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/book/src/BookBreadcrumbBuilder.php, line 58

Class

BookBreadcrumbBuilder

Provides a breadcrumb builder for nodes in a book.

Namespace

Drupal\book

Code

public function build(RouteMatchInterface $route_match) {
  $book_nids = [];
  $breadcrumb = new Breadcrumb();
  $links = [
    Link::createFromRoute($this
      ->t('Home'), '<front>'),
  ];
  $book = $route_match
    ->getParameter('node')->book;
  $depth = 1;

  // We skip the current node.
  while (!empty($book['p' . ($depth + 1)])) {
    $book_nids[] = $book['p' . $depth];
    $depth++;
  }
  $parent_books = $this->nodeStorage
    ->loadMultiple($book_nids);
  if (count($parent_books) > 0) {
    $depth = 1;
    while (!empty($book['p' . ($depth + 1)])) {
      if (!empty($parent_books[$book['p' . $depth]]) && ($parent_book = $parent_books[$book['p' . $depth]])) {
        $access = $parent_book
          ->access('view', $this->account, TRUE);
        $breadcrumb
          ->addCacheableDependency($access);
        if ($access
          ->isAllowed()) {
          $breadcrumb
            ->addCacheableDependency($parent_book);
          $links[] = Link::createFromRoute($parent_book
            ->label(), 'entity.node.canonical', [
            'node' => $parent_book
              ->id(),
          ]);
        }
      }
      $depth++;
    }
  }
  $breadcrumb
    ->setLinks($links);
  $breadcrumb
    ->addCacheContexts([
    'route.book_navigation',
  ]);
  return $breadcrumb;
}