/**
  * {@inheritdoc}
  */
 public function buildForm(FormBuilderInterface $builder, array $options)
 {
     if ($builder->getForm()->getName() == CustomEntityType::NAME) {
         return;
     }
     $className = !empty($options['data_class']) ? $options['data_class'] : null;
     if (!$className) {
         return;
     }
     if (!$this->extendManager->getConfigProvider()->hasConfig($className)) {
         return;
     }
     if (!$this->hasActiveFields($className)) {
         return;
     }
     $builder->add('additional', CustomEntityType::NAME, array('inherit_data' => true, 'class_name' => $className));
 }
 /**
  * @param $entity
  * @return bool
  */
 public function isExtendEntity($entity)
 {
     return $this->extendManager->isExtend($entity);
 }
 /**
  * @param ExtendManager $extendManager
  */
 public function __construct(ExtendManager $extendManager)
 {
     $this->extendConfigProvider = $extendManager->getConfigProvider();
     $this->extendManager = $extendManager;
 }