* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Presta\SitemapBundle\Sitemap\Url; use Presta\SitemapBundle\Sitemap\Utils; /** * Decorate w/ google alternate language url guidelines * * @see http://support.google.com/webmasters/bin/answer.py?hl=en&answer=2620865 * * @author David Epely */ class GoogleMultilangUrlDecorator extends UrlDecorator { const REL_ALTERNATE = 'alternate'; /** * @var array */ protected $customNamespaces = ['xhtml' => 'http://www.w3.org/1999/xhtml']; /** * @var string */ protected $linkXml = ''; /** * add an alternative language to the url * * @param string $href Valid url of the translated page * @param string $hreflang Valid language code @see * http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_LanguageCode * @param string|null $rel (default is alternate) - valid link type @see * http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_LinkTypes * * @return GoogleMultilangUrlDecorator */ public function addLink($href, $hreflang, $rel = null) { $this->linkXml .= $this->generateLinkXml($href, $hreflang, $rel); return $this; } /** * @param string $href * @param string $hreflang * @param string|null $rel * * @return string */ protected function generateLinkXml($href, $hreflang, $rel = null) { if (null == $rel) { $rel = self::REL_ALTERNATE; } $xml = ''; return $xml; } /** * @inheritdoc */ public function toXml() { $baseXml = $this->urlDecorated->toXml(); return str_replace('', $this->linkXml . '', $baseXml); } }