/**
  * the singleton pattern
  *
  * @return ActiveSync_Controller_SyncDevices
  */
 public static function getInstance()
 {
     if (self::$_instance === NULL) {
         self::$_instance = new ActiveSync_Controller_SyncDevices();
     }
     return self::$_instance;
 }
 /**
  * deletes existing records
  *
  * @param  array  $ids
  * @return string
  */
 public function deleteSyncDevices($ids)
 {
     return $this->_delete($ids, ActiveSync_Controller_SyncDevices::getInstance());
 }