private function renderRequiredFilesLines()
    {
        $code = array();
        $indentation = $this->getIndentation();
        foreach ($this->requiredFiles as $requiredFile) {
            $code[] = $indentation . "require_once ('" . $requiredFile . "');";
        }

        if (count($this->requiredFiles) > 0) {
            $code[] = null;
        }

        return $code;
    }