@Override
public Set<Integer> getCarIds(String company, String type) {
Set<Integer> out = new HashSet<Integer>();
try {
for (Car c : em.find(CarRentalCompany.class, company).getCars(type)) {
out.add(c.getId());
}
} catch (IllegalArgumentException ex) {
Logger.getLogger(ManagerSession.class.getName()).log(Level.SEVERE, null, ex);
return null;
}
return out;
}
