public function BreadcrumbManager::build

File

core/lib/Drupal/Core/Breadcrumb/BreadcrumbManager.php, line 72

Class

BreadcrumbManager

Provides a breadcrumb manager.

Namespace

Code

public function build(RouteMatchInterface $route_match) {
  $breadcrumb = new Breadcrumb();
  $context = [
    'builder' => NULL,
  ];

  // Call the build method of registered breadcrumb builders,
  // until one of them returns an array.
  foreach ($this
    ->getSortedBuilders() as $builder) {
    if (!$builder
      ->applies($route_match)) {

      // The builder does not apply, so we continue with the other builders.
      continue;
    }
    $breadcrumb = $builder
      ->build($route_match);
    if ($breadcrumb instanceof Breadcrumb) {
      $context['builder'] = $builder;
      break;
    }
    else {
      throw new \UnexpectedValueException('Invalid breadcrumb returned by ' . get_class($builder) . '::build().');
    }
  }

  // Allow modules to alter the breadcrumb.
  $this->moduleHandler
    ->alter('system_breadcrumb', $breadcrumb, $route_match, $context);
  return $breadcrumb;
}