public function checkEvent($params, $obj)
 {
     $this->initializeAction();
     $frameworkConfiguration = $this->configurationManager->getConfiguration(Tx_Extbase_Configuration_ConfigurationManagerInterface::CONFIGURATION_TYPE_FRAMEWORK, 'woehrlSeminare', 'Eventlist');
     //~ t3lib_utility_Debug::debug($params, 'addInformation: params: ');
     $gp = t3lib_div::_GP('tx_powermail_pi1');
     $formUid = $gp['form'];
     $form = $this->formsRepository->findByUid($formUid);
     if (!method_exists($form, 'getPages')) {
         return $this->isValid = FALSE;
     }
     foreach ($form->getPages() as $page) {
         // every page in current form
         foreach ($page->getFields() as $field) {
             // every field in current page
             switch ($field->getMarker()) {
                 case 'action':
                     $action = $params[$field->getUid()];
                     break;
                 case 'editcode':
                     $editcode = $params[$field->getUid()];
                     break;
                 case 'event':
                     $formIdEvent = $field->getUid();
                     $eventId = $params[$formIdEvent];
                     break;
                 case 'eventtitle':
                     $formIdEventtitle = $field->getUid();
                     break;
             }
         }
     }
     //~ t3lib_utility_Debug::debug($editcode, 'checkEvent: editcode... ');
     switch ($action) {
         case 'delete':
             //~ $subscriber = $this->subscriberRepository->findAllByFeuser($frameworkConfiguration['persistence']['storagePid'])->getFirst();
             $subscriber = $this->subscriberRepository->findAllByEditcode($editcode, $frameworkConfiguration['persistence']['storagePid'])->getFirst();
             if (empty($subscriber)) {
                 t3lib_utility_Debug::debug($subscriber, 'checkEvent: NO subscriber found... ');
                 $obj->isValid = FALSE;
                 // we have to use the language labels of powermail :-(
                 // --> for validationerror_validation:
                 $obj->setError('validation', $idEventTitle);
                 break;
             }
             //~ t3lib_utility_Debug::debug($subscriber, 'saveSubscription: delete... ');
             $event = $this->eventRepository->findByUid($eventId);
             if (empty($event)) {
                 $obj->isValid = FALSE;
                 // we have to use the language labels of powermail :-(
                 // --> for validationerror_validation:
                 $obj->setError('validation', $idEventTitle);
                 break;
             }
             $event->removeSubscriber($subscriber);
             break;
         case 'new':
             if ($eventId > 0) {
                 $event = $this->eventRepository->findByUid($eventId);
                 // limit reached already --> overbooked
                 if (count($event->getSubscribers()) >= $event->getMaxSubscriber()) {
                     $obj->isValid = FALSE;
                     // we have to use the language labels of powermail :-(
                     // --> for validationerror_validation:
                     $obj->setError('validation', $idEventTitle);
                 }
             }
             break;
         default:
             return;
     }
     return;
     //~ t3lib_utility_Debug::debug($eventId  , 'checkEvent: eventId');
     if ($eventId > 0) {
         $event = $this->eventRepository->findByUid($eventId);
         // limit reached already --> overbooked
         if (count($event->getSubscribers()) >= $event->getMaxSubscriber()) {
             $obj->isValid = FALSE;
             // we have to use the language labels of powermail :-(
             // --> for validationerror_validation:
             $obj->setError('validation', $idEventTitle);
         }
     }
     return;
 }