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<?php
namespace Drupal\book;
use Drupal\Core\Breadcrumb\Breadcrumb;
use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Link;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\node\NodeInterface;
/**
* Provides a breadcrumb builder for nodes in a book.
*/
class BookBreadcrumbBuilder implements BreadcrumbBuilderInterface {
use StringTranslationTrait;
/**
* The node storage.
*
* @var \Drupal\Core\Entity\EntityStorageInterface
*/
protected $nodeStorage;
/**
* The current user account.
*
* @var \Drupal\Core\Session\AccountInterface
*/
protected $account;
/**
* Constructs the BookBreadcrumbBuilder.
*
* @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
* The entity manager service.
* @param \Drupal\Core\Session\AccountInterface $account
* The current user account.
*/
public function __construct(EntityManagerInterface $entity_manager, AccountInterface $account) {
$this->nodeStorage = $entity_manager->getStorage('node');
$this->account = $account;
}
/**
* {@inheritdoc}
*/
public function applies(RouteMatchInterface $route_match) {
$node = $route_match->getParameter('node');
return $node instanceof NodeInterface && !empty($node->book);
}
/**
* {@inheritdoc}
*/
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;
}
}