public function index()
    {
        $deliveryService = DeliveryAssemblyService::singleton();
        if($this->getRequestParameter('classUri') !== $deliveryService->getRootClass()->getUri()) {
            $filter = $this->getRequestParameter('filter');
            $uri = $this->getRequestParameter('uri');
            if (!\common_Utils::isUri(tao_helpers_Uri::decode($uri))) {
                throw new \tao_models_classes_MissingRequestParameterException('uri');
            }
            $this->setData('filter', $filter);
            $this->setData('uri', $uri);
            $this->setView('resultTable.tpl');
        } else {
            $this->setData('type', 'info');
            $this->setData('error',__('No tests have been taken yet. As soon as a test-taker will take a test his results will be displayed here.'));
            $this->setView('index.tpl');
        }
    }