/**
  * Retrieve all database table names.
  *
  * @param GetPropertyOptionsEvent $event The event.
  *
  * @return void
  */
 public static function getCountriesByContinent(GetPropertyOptionsEvent $event)
 {
     if ($event->getEnvironment()->getDataDefinition()->getName() !== 'tl_metamodel_attribute' || $event->getPropertyName() !== 'geoprotection') {
         return;
     }
     // Get the current values.
     $arrValues = $event->getOptions();
     // Call the helper to get all data.
     $arrValues = Helper::getCountriesByContinent($arrValues);
     // Set the new options.
     $event->setOptions($arrValues);
 }
 /**
  * Returns an array with selected countries.
  *
  * @return array|null
  */
 public function getSelectedCountries()
 {
     $objValue = \Database::getInstance()->prepare('SELECT geoprotection FROM tl_metamodel_attribute WHERE id = ?')->limit(1)->execute($this->get('id'));
     return Helper::getCountriesByContinent(deserialize($objValue->geoprotection));
 }