class Nid

class Nid extends NumericArgument {
    
    /**
     * The node storage.
     *
     * @var \Drupal\node\NodeStorageInterface
     */
    protected $nodeStorage;
    
    /**
     * Constructs the Nid 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\node\NodeStorageInterface $node_storage
     *   The node storage handler.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, NodeStorageInterface $node_storage) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->nodeStorage = $node_storage;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity_type.manager')
            ->getStorage('node'));
    }
    
    /**
     * Override the behavior of title(). Get the title of the node.
     */
    public function titleQuery() {
        $titles = [];
        $nodes = $this->nodeStorage
            ->loadMultiple($this->value);
        foreach ($nodes as $node) {
            $titles[] = $node->label();
        }
        return $titles;
    }

}