outline-8.x-1.x-dev/modules/outline_graphql/src/Plugin/GraphQL/DataProducer/Outline/RootEid.php

<?php

namespace Drupal\outline_graphql\Plugin\GraphQL\DataProducer\Outline;

use Drupal\Core\Entity\EntityInterface;
use Drupal\graphql\Plugin\GraphQL\DataProducer\DataProducerPluginBase;
use Drupal\outline\Entity\Outline;

/**
 * @DataProducer(
 *   id = "root_eid",
 *   name = @Translation("Root Entry ID"),
 *   description = @Translation("Returns the root entry identifier."),
 *   produces = @ContextDefinition("integer",
 *     label = @Translation("Identifier")
 *   ),
 *   consumes = {
 *     "entity" = @ContextDefinition("entity",
 *       label = @Translation("Entity")
 *     )
 *   }
 * )
 */
class RootEid extends DataProducerPluginBase {

  /**
   * @param \Drupal\outline\Entity\Outline $outline
   *
   * @return mixed
   */
  public function resolve(Outline $outline) {
    return $outline->getRootEntryId();
  }

}