protected function getUploadTempFile()
    {
        $sUploadDir = $this->getOption('upload.default.dir');
        $sUploadDir = rtrim(trim($sUploadDir), DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
        $sUploadDir .= 'tmp' . DIRECTORY_SEPARATOR;
        $sUploadTempFile = $sUploadDir . $this->sTempFile . '.json';
        if(!is_readable($sUploadTempFile))
        {
            throw new \Jaxon\Exception\Error($this->trans('errors.upload.access'));
        }
        return $sUploadTempFile;
    }