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97 lines
2.7 KiB
97 lines
2.7 KiB
6 years ago
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<?php
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namespace Drupal\islandora_breadcrumbs;
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use Drupal\Core\Config\ConfigFactoryInterface;
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use Drupal\Core\Entity\EntityInterface;
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use Drupal\Core\Breadcrumb\Breadcrumb;
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use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
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use Drupal\Core\Routing\RouteMatchInterface;
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/**
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* Provides breadcrumbs for nodes using a configured entity reference field.
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*/
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class IslandoraBreadcrumbBuilder implements BreadcrumbBuilderInterface {
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/**
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* The configuration.
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*
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* @var \Drupal\Core\Config\ImmutableConfig
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*/
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protected $config;
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/**
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* Constructs a breadcrumb builder.
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*
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* @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
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* The configuration factory.
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*/
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public function __construct(ConfigFactoryInterface $config_factory) {
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$this->config = $config_factory->get('islandora.breadcrumbs');
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}
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/**
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* {@inheritdoc}
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*/
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public function applies(RouteMatchInterface $attributes) {
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$parameters = $attributes->getParameters()->all();
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if (!empty($parameters['node'])) {
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return ($parameters['node']->hasField($this->config->get('referenceField')) &&
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!$parameters['node']->get($this->config->get('referenceField'))->isEmpty());
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function build(RouteMatchInterface $route_match) {
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$node = $route_match->getParameter('node');
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$breadcrumb = new Breadcrumb();
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$chain = [];
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$this->walkMembership($node, $chain);
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if (!$this->config->get('includeSelf')) {
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array_pop($chain);
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}
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$breadcrumb->addCacheableDependency($node);
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// Add membership chain to the breadcrumb.
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foreach ($chain as $chainlink) {
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$breadcrumb->addCacheableDependency($chainlink);
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$breadcrumb->addLink($chainlink->toLink());
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}
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$breadcrumb->addCacheContexts(['route']);
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return $breadcrumb;
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}
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/**
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* Follows chain of field_member_of links.
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*
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* We pass crumbs by reference to enable checking for looped chains.
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*/
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protected function walkMembership(EntityInterface $entity, &$crumbs) {
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// Avoid infinate loops, return if we've seen this before.
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foreach ($crumbs as $crumb) {
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if ($crumb->uuid == $entity->uuid) {
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return;
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}
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}
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// Add this item onto the pile.
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array_unshift($crumbs, $entity);
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if ($this->config->get('maxDepth') > 0 && count($crumbs) >= $this->config->get('maxDepth')) {
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return;
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}
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// Find the next in the chain, if there are any.
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if ($entity->hasField($this->config->get('referenceField')) &&
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!$entity->get($this->config->get('referenceField'))->isEmpty()) {
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$this->walkMembership($entity->get($this->config->get('referenceField'))->entity, $crumbs);
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}
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}
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}
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