public function checkFile($sFile)
    {
        $aCheckCache = \OxidEsales\Eshop\Core\Registry::getSession()->getVariable("checkcache");

        if (isset($aCheckCache[$sFile])) {
            return $aCheckCache[$sFile];
        }

        $blRet = true;
        if (!is_readable($sFile)) {
            $blRet = $this->urlValidate($sFile);
        }

        $aCheckCache[$sFile] = $blRet;
        \OxidEsales\Eshop\Core\Registry::getSession()->setVariable("checkcache", $aCheckCache);

        return $blRet;
    }