public function createNamespace($type, $user, array $params = array())
{
$class = 'Horde_Kolab_Storage_Folder_Namespace_' . Horde_String::ucfirst($type);
if (!class_exists($class)) {
throw new Horde_Kolab_Storage_Exception(sprintf(Horde_Kolab_Storage_Translation::t('Invalid "namespace" type "%s"!'), $type));
}
return new $class($user, $params);
}