BreadcrumbManager::build

public BreadcrumbManager::build(RouteMatchInterface $route_match)

public function build(RouteMatchInterface $route_match) {
  $breadcrumb = new Breadcrumb();
  $context = array('builder' => NULL);
  // Call the build method of registered breadcrumb builders,
  // until one of them returns an array.
  foreach ($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;
}