/**
  * @return AbstractConfDriver
  */
 public function getConfImpl()
 {
     if (!isset(self::$confImpl) || isset($this->pluginConf["UNIQUE_INSTANCE_CONFIG"]["instance_name"]) && self::$confImpl->getId() != $this->pluginConf["UNIQUE_INSTANCE_CONFIG"]["instance_name"]) {
         if (isset($this->pluginConf["UNIQUE_INSTANCE_CONFIG"])) {
             self::$confImpl = ConfService::instanciatePluginFromGlobalParams($this->pluginConf["UNIQUE_INSTANCE_CONFIG"], "AbstractConfDriver");
             AJXP_PluginsService::getInstance()->setPluginUniqueActiveForType("conf", self::$confImpl->getName());
         }
     }
     return self::$confImpl;
 }