private function parseIndisponibilities(HTTPRequest $request, Announcement $announce)
 {
     if ($request->postData('date-list') != '') {
         $unavailabilities = array();
         $dates = $request->postData('date-list');
         $dates = explode(',', $dates);
         foreach ($dates as $date) {
             $unavailability = new AnnouncementUnavailability();
             $unavailability->setDate($date);
             $unavailability->setDateOption($request->postData($date));
             $unavailability->setAnnouncementId($announce->id());
             $unavailabilities[] = $unavailability;
         }
         return $unavailabilities;
     }
     return null;
 }