/**
* If the current version number is not set, it looks in DB
* else it takes it from the static property current_version.
* TODO: compare it with a document_id, because current_version is only independent from same document
*/
public static function getCurrentVersionNb($id, $lang)
{
if (!isset(self::$current_version)) {
self::$current_version = Document::getCurrentVersionNumberFromIdAndCulture($id, $lang);
}
return self::$current_version;
}