* Mongo Object IDs</a>
*/
public String fromIdToLong(String id, boolean isUser) {
DBObject objectIdLong = collectionMap.findOne(new BasicDBObject("element_id", id));
if (objectIdLong != null) {
Map<String,Object> idLong = (Map<String,Object>) objectIdLong.toMap();
Object value = idLong.get("long_value");
return value == null ? null : value.toString();
} else {
objectIdLong = new BasicDBObject();
String longValue = Long.toString(idCounter++);