class Type

class Type extends StringArgument {
  
  /**
   * NodeType storage handler.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected $nodeTypeStorage;
  
  /**
   * Constructs a new Node Type 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\EntityStorageInterface $node_type_storage
   *   The entity storage class.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityStorageInterface $node_type_storage) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->nodeTypeStorage = $node_type_storage;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    $entity_type_manager = $container->get('entity_type.manager');
    return new static($configuration, $plugin_id, $plugin_definition, $entity_type_manager->getStorage('node_type'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function summaryName($data) {
    return $this->node_type($data->{$this->name_alias});
  }
  
  /**
   * {@inheritdoc}
   */
  public function title() {
    return $this->node_type($this->argument);
  }
  
  /**
   * Returns the label for the given node type.
   */
  public function node_type($type_name) {
    $type = $this->nodeTypeStorage
      ->load($type_name);
    $output = $type ? $type->label() : $this->t('Unknown content type');
    return $output;
  }

}