public function getAdapters()
    {
        $registry = $this->getRegistry();
        $config = [];
        if ($registry->isRegistered(self::REGISTRY_ENTRY_KEY)) {
            $config = $registry->get(self::REGISTRY_ENTRY_KEY);
        }

        if (isset($config[self::PREVIEWERS_KEY])) {
            return $config[self::PREVIEWERS_KEY];
        }
        return [];
    }