How to use

MoreThanOneResultException

in

io.yawp.repository.query

private T executeQueryOnly() throws MoreThanOneResultException {
  List<T> list = executeQuery();
  if (list.size() == 0) {
    throw new NoResultException();
  }
  if (list.size() == 1) {
    return list.get(0);
  }
  throw new MoreThanOneResultException();
}

public IdRef<T> onlyId() throws NoResultException, MoreThanOneResultException {
  List<IdRef<T>> ids = ids();
  if (ids.size() == 0) {
    throw new NoResultException();
  }
  if (ids.size() > 1) {
    throw new MoreThanOneResultException();
  }
  return ids.get(0);
}