/**
  * Build a realm tree structure
  * 
  * This method calls {@link buildRealmTree} to build a realm tree data 
  * structure. The returned structure does not contain any auth data 
  * as it would not make sense in this context. The main use for this is 
  * to get a hierarchical view of all the realms.
  * 
  * @return array A realm tree data structure
  */
 protected function buildRealmTreeForRealm()
 {
     return AuthUtil::buildRealmTree(null, null);
 }
 public static function buildRealmTreeForUser($uid)
 {
     return AuthUtil::buildRealmTree($uid, false);
 }