public function addPage(SearchPageData $data)
    {
        $url = $data->getUrl();
        $this->pages[$url] = array(
            'title' => $data->getTitle(),
            'text'  => $data->getContents(),
            'tags'  => $data->getTags(true),
            'url'   => $url,
        );

        return $this;
    }