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<?php
namespace Drupal\Core\Breadcrumb;
use Drupal\Core\Cache\RefinableCacheableDependencyInterface;
use Drupal\Core\Cache\RefinableCacheableDependencyTrait;
use Drupal\Core\Link;
use Drupal\Core\Render\RenderableInterface;
/**
* Used to return generated breadcrumbs with associated cacheability metadata.
*/
class Breadcrumb implements RenderableInterface, RefinableCacheableDependencyInterface {
use RefinableCacheableDependencyTrait;
/**
* An ordered list of links for the breadcrumb.
*
* @var \Drupal\Core\Link[]
*/
protected $links = [];
/**
* Gets the breadcrumb links.
*
* @return \Drupal\Core\Link[]
*/
public function getLinks() {
return $this->links;
}
/**
* Sets the breadcrumb links.
*
* @param \Drupal\Core\Link[] $links
* The breadcrumb links.
*
* @return $this
*
* @throws \LogicException
* Thrown when setting breadcrumb links after they've already been set.
*/
public function setLinks(array $links) {
if (!empty($this->links)) {
throw new \LogicException('Once breadcrumb links are set, only additional breadcrumb links can be added.');
}
$this->links = $links;
return $this;
}
/**
* Appends a link to the end of the ordered list of breadcrumb links.
*
* @param \Drupal\Core\Link $link
* The link appended to the breadcrumb.
*
* @return $this
*/
public function addLink(Link $link) {
$this->links[] = $link;
return $this;
}
/**
* {@inheritdoc}
*/
public function toRenderable() {
$build = [
'#cache' => [
'contexts' => $this->cacheContexts,
'tags' => $this->cacheTags,
'max-age' => $this->cacheMaxAge,
],
];
if (!empty($this->links)) {
$build += [
'#theme' => 'breadcrumb',
'#links' => $this->links,
];
}
return $build;
}
}