private function listAllSites(OutputInterface $output)
    {
        $output->writeln(sprintf(' % 5s - % -30s - %s', 'ID', 'Name', 'Url'));

        $sites = $this->getSiteManager()->findAll();

        foreach ($sites as $site) {
            $output->writeln(sprintf(' % 5s - % -30s - %s', $site->getId(), $site->getName(), $site->getUrl()));
        }
    }