public function insertApp(AppLauncher $app)
 {
     $launcherPath = self::APPS_DIR . '/' . $app['name'] . '.xml';
     $xml = new TranslatedDOMDocument('1.0');
     $root = $xml->createElement('shortcut');
     $xml->appendChild($root);
     $appData = $app->toArray();
     foreach ($appData as $name => $value) {
         $attrEl = $xml->createElement('attribute');
         $root->appendChild($attrEl);
         $nameAttr = $xml->createAttribute('name');
         $nameAttr->appendChild($xml->createTextNode($name));
         $attrEl->appendChild($nameAttr);
         $valueAttr = $xml->createAttribute('value');
         $valueAttr->appendChild($xml->createTextNode($value));
         $attrEl->appendChild($valueAttr);
     }
     $this->dao->write($launcherPath, $xml->saveXML());
 }