SitemapController::actionIndex PHP Method

    public function actionIndex()
    {
        $module = Yii::app()->getModule('sitemap');
        $sitemapFile = $module->getSiteMapPath();
        if (!file_exists($sitemapFile)) {
            $staticPages = SitemapPage::model()->getData();
            $this->generator->generate($sitemapFile, $staticPages);
        }
        $this->redirect(['/sitemap/sitemap/index'], 301);
    }