SelectionTrait.php

<?php

namespace Drupal\Core\Entity\EntityReferenceSelection;

use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
@trigger_error(__NAMESPACE__ . '\\SelectionTrait is deprecated in drupal:8.7.0 and will be removed before drupal:9.0.0. A custom constructor must be implemented instead. See https://www.drupal.org/node/3030634', E_USER_DEPRECATED);

/**
 * Provides common methods and injects services for core selection handlers.
 */
trait SelectionTrait {
    
    /**
     * The entity manager service.
     *
     * @var \Drupal\Core\Entity\EntityManagerInterface
     */
    protected $entityManager;
    
    /**
     * The module handler service.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $currentUser;
    
    /**
     * Constructs a new selection object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
     *   The entity manager service.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler service.
     * @param \Drupal\Core\Session\AccountInterface $current_user
     *   The current user.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityManagerInterface $entity_manager, ModuleHandlerInterface $module_handler, AccountInterface $current_user) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->entityManager = $entity_manager;
        $this->moduleHandler = $module_handler;
        $this->currentUser = $current_user;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity.manager'), $container->get('module_handler'), $container->get('current_user'));
    }

}