public void edit(Long altId, Vote vote)
throws NonExistingEntityException, RollbackFailureException, Exception {
Alternative alternative = em.find(Alternative.class, altId);
if (alternative == null) {
throw new NonExistingEntityException("Alternative with Id = " + altId + " does not exist");
}
vote.setAlternative(alternative);
Vote persistentVote = em.find(Vote.class, vote.getId());
Alternative alternativeOld = persistentVote.getAlternative();
Alternative alternativeNew = vote.getAlternative();
if (alternativeNew != null) {
alternativeNew = em.getReference(alternativeNew.getClass(), alternativeNew.getId());
vote.setAlternative(alternativeNew);
}
vote = em.merge(vote);
if (alternativeOld != null && !alternativeOld.equals(alternativeNew)) {
alternativeOld.getVotes().remove(vote);
alternativeOld = em.merge(alternativeOld);
}
if (alternativeNew != null && !alternativeNew.equals(alternativeOld)) {
alternativeNew.getVotes().add(vote);
alternativeNew = em.merge(alternativeNew);
}
}
public void destroy(Long id)
throws NonExistingEntityException, RollbackFailureException, Exception {
Vote vote;
try {
vote = em.getReference(Vote.class, id);
vote.getId();
} catch (EntityNotFoundException enfe) {
throw new NonExistingEntityException("The vote with id " + id + " no longer exists.", enfe);
}
Alternative alternative = vote.getAlternative();
if (alternative != null) {
alternative.getVotes().remove(vote);
alternative = em.merge(alternative);
}
em.remove(vote);
}