public void delete(Announcement announcement) {
assert announcement != null;
assert announcement.getId() != 0;
Assert.isTrue(announcementRepository.exists(announcement.getId()));
Assert.isTrue(!registrationService.existsRegistrationForAnnouncement(announcement));
announcementRepository.delete(announcement);
}
public void save(Announcement announcement) {
assert announcement != null;
Date currentMoment;
currentMoment = new Date();
Assert.isTrue(announcement.getCertification().getExtinctionDate().after(currentMoment));
Assert.isTrue(announcement.getCertification().getExams().contains(announcement.getExam()));
announcementRepository.save(announcement);
}