private static Privilege[] filterPrivileges( Privilege[] privileges, List<Privilege> privilegesToFilterOut) { Set<Privilege> filteredResult = new HashSet<Privilege>(); for (Privilege privilege : privileges) { if (!privilegesToFilterOut.contains(privilege)) { if (privilege.isAggregate() && areIntersecting(privilege.getDeclaredAggregatePrivileges(), privilegesToFilterOut)) { // We de-aggregate a privilege in case any of its children are to be filtered out, since a // privilege is valid only if all its children are valid. filteredResult.addAll( Arrays.asList( filterPrivileges( privilege.getDeclaredAggregatePrivileges(), privilegesToFilterOut))); } else { filteredResult.add(privilege); } } } return filteredResult.toArray(new Privilege[filteredResult.size()]); }