public function addLinksFrom(Service $service) {
	    $links = $service->getLinks();
	    foreach($links as $name => $link) {
	        if (is_numeric($name)) {
                $this->addLink($link);
            } else {
                $this->addLink($link, $name);
            }
        }

        $externalLinks = $service->getExternalLinks();
	    foreach($externalLinks as $name => $link) {
	        if (is_numeric($name)) {
                $this->addExternalLink($link);
            } else {
                $this->addExternalLink($link, $name);
            }
        }

	}