public function isMemberInStem()
 {
     $groups = $this->_grouperClient->getGroups($this->_stem);
     return !empty($groups);
 }
 protected function _getGrouperClient()
 {
     if (!isset($this->_grouperClient)) {
         $applicationConfig = EngineBlock_ApplicationSingleton::getInstance()->getConfiguration();
         $configReader = new EngineBlock_Group_Provider_ProviderConfig();
         $config = $configReader->createFromDatabaseFor($applicationConfig->defaultGroupProvider);
         $this->_grouperClient = Grouper_Client_Rest::createFromConfig($config->current());
     }
     return $this->_grouperClient;
 }