private void collectGranteeIdsOnACL(ACL acl, Set<String>[] idHolders) { if (acl != null) { for (ACL.Grant grant : acl.getGrants()) { int idx = getGranteeBucket(grant.getGranteeType()); if (idx != -1) { if (idHolders[idx] == null) { idHolders[idx] = new HashSet<String>(); } idHolders[idx].add(grant.getGranteeId()); } } } }