Generating doctrine slugs manually

I'm using sluggable behavior in my Symfony2 project, but now I would like to make many slugs for one page, based on different texts (current title, old title(s), users text from form input), and keep it in another table. And my question is - how to manually use doctrine extensions for any text? I can't find it anywhere. Perfect would be something like:

/* careful - it's not a real, working code! */
$sluggable = new DoctrineSluggable();
$slug = $sluggable->generate('My own text!');
echo $slug; // my-own-text

I found solution by accident here. Code:

use Gedmo\Sluggable\Util as Sluggable;    

$string = 'My own text!';
$slug = Sluggable\Urlizer::urlize($string, '-');
    if(empty($slug)) // if $string is like '=))' or 'トライアングル・サービス' an empty slug will be returned, that causes troubles and throws no exception
        echo 'error, empty slug!!!';
    else
        echo $slug;