function BookBreadcrumbBuilder::build

Overrides BreadcrumbBuilderInterface::build

File

core/modules/book/src/BookBreadcrumbBuilder.php, line 81

Class

BookBreadcrumbBuilder

Provides a breadcrumb builder for nodes in a book.

Namespace

Code

public function build(RouteMatchInterface $route_match) {
    $book_nids = [];
    $breadcrumb = new Breadcrumb();
    $links = [
        Link::createFromRoute($this->t('Home'), '<front>', [], [
            'language' => $this->languageManager
                ->getCurrentLanguage(LanguageInterface::TYPE_CONTENT),
        ]),
    ];
    $breadcrumb->addCacheContexts([
        'languages:' . LanguageInterface::TYPE_CONTENT,
    ]);
    $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++;
    }
    
    /** @var \Drupal\node\NodeInterface[] $parent_books */
    $parent_books = $this->nodeStorage
        ->loadMultiple($book_nids);
    $parent_books = array_map([
        $this->entityRepository,
        'getTranslationFromContext',
    ], $parent_books);
    if (count($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[] = $parent_book->toLink();
                }
            }
            $depth++;
        }
    }
    $breadcrumb->setLinks($links);
    $breadcrumb->addCacheContexts([
        'route.book_navigation',
    ]);
    return $breadcrumb;
}