public function getSearchSortingDefaultOrderBySortOptionName($sortOptionName = '', $defaultIfEmpty = 'asc')
    {
        $sortOrderSpecificPath = 'plugin.tx_solr.search.sorting.options.' . $sortOptionName . '.defaultOrder';
        $specificSortOrder = $this->getValueByPathOrDefaultValue($sortOrderSpecificPath, null);

        // if we have a concrete setting, use it
        if ($specificSortOrder !== null) {
            return mb_strtolower($specificSortOrder);
        }

        // no specific setting, check common setting
        $commonPath = 'plugin.tx_solr.search.sorting.defaultOrder';
        $commonATagParamOrDefaultValue = $this->getValueByPathOrDefaultValue($commonPath, $defaultIfEmpty);
        return mb_strtolower($commonATagParamOrDefaultValue);
    }