public function onAnnouncementCreate(AnnouncementEvent $event)
 {
     $announcement = new Announcement();
     $announcement->setText($event->getText());
     $announcement->setType($event->getType());
     $announcement->setStartdate($event->getStart());
     $announcement->setEnddate($event->getEnd());
     $announcement->setUser($event->getUser());
     $this->doctrine->persist($announcement);
     $this->doctrine->flush();
 }