/**
  * Lookup mapping status
  * @param int $a_server_id
  * @param int $a_tree_id
  * @return int
  */
 public static function lookupMappingStatus($a_server_id, $a_mid, $a_tree_id)
 {
     include_once './Services/WebServices/ECS/classes/Mapping/class.ilECSNodeMappingAssignments.php';
     if (ilECSNodeMappingAssignments::hasAssignments($a_server_id, $a_mid, $a_tree_id)) {
         if (ilECSNodeMappingAssignments::isWholeTreeMapped($a_server_id, $a_mid, $a_tree_id)) {
             return self::MAPPED_WHOLE_TREE;
         }
         return self::MAPPED_MANUAL;
     }
     return self::MAPPED_UNMAPPED;
 }