public void addWorkoutParticipants(
final User user, final Long workoutId, final Long... participants)
throws AccessDeniedException {
final WorkoutImpl workout = entityManager.find(WorkoutImpl.class, workoutId);
if (!workout.getUser().equals(user)) throw new AccessDeniedException();
final Set<Long> participantsSet = new HashSet<Long>(Arrays.asList(participants));
final Query query = createParticipantsInsertUnionQuery(workoutId, participantsSet);
query.executeUpdate();
}
public void removeWorkoutParticipants(
final User user, final Long workoutId, final Long... participants)
throws AccessDeniedException {
final WorkoutImpl workout = entityManager.find(WorkoutImpl.class, workoutId);
if (!workout.getUser().equals(user)) throw new AccessDeniedException();
final Set<Long> participantsWithoutSelf = new HashSet<Long>(Arrays.asList(participants));
participantsWithoutSelf.remove(user.getId());
final Query query = createParticipantsDeleteQuery(workoutId, participantsWithoutSelf);
query.executeUpdate();
}