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<?php
namespace Drupal\node\ContextProvider;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Plugin\Context\Context;
use Drupal\Core\Plugin\Context\ContextProviderInterface;
use Drupal\Core\Plugin\Context\EntityContext;
use Drupal\Core\Plugin\Context\EntityContextDefinition;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\node\Entity\Node;
use Drupal\Core\StringTranslation\StringTranslationTrait;
/**
* Sets the current node as a context on node routes.
*/
class NodeRouteContext implements ContextProviderInterface {
use StringTranslationTrait;
/**
* The route match object.
*
* @var \Drupal\Core\Routing\RouteMatchInterface
*/
protected $routeMatch;
/**
* Constructs a new NodeRouteContext.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match object.
*/
public function __construct(RouteMatchInterface $route_match) {
$this->routeMatch = $route_match;
}
/**
* {@inheritdoc}
*/
public function getRuntimeContexts(array $unqualified_context_ids) {
$result = [];
$context_definition = EntityContextDefinition::create('node')->setRequired(FALSE);
$value = NULL;
if (($route_object = $this->routeMatch->getRouteObject())) {
$route_contexts = $route_object->getOption('parameters');
// Check for a node revision parameter first.
if (isset($route_contexts['node_revision']) && $revision = $this->routeMatch->getParameter('node_revision')) {
$value = $revision;
}
elseif (isset($route_contexts['node']) && $node = $this->routeMatch->getParameter('node')) {
$value = $node;
}
elseif (isset($route_contexts['node_preview']) && $node = $this->routeMatch->getParameter('node_preview')) {
$value = $node;
}
elseif ($this->routeMatch->getRouteName() == 'node.add') {
$node_type = $this->routeMatch->getParameter('node_type');
$value = Node::create(['type' => $node_type->id()]);
}
}
$cacheability = new CacheableMetadata();
$cacheability->setCacheContexts(['route']);
$context = new Context($context_definition, $value);
$context->addCacheableDependency($cacheability);
$result['node'] = $context;
return $result;
}
/**
* {@inheritdoc}
*/
public function getAvailableContexts() {
$context = EntityContext::fromEntityTypeId('node', $this->t('Node from URL'));
return ['node' => $context];
}
}
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