/**
* @return bool
* @param string $s_input
* @param string[] field names $a_keys
* @desc Test whether a short URL is already taken by another page
*/
public function Test($s_input, $a_keys)
{
$short_url = new ShortUrl($s_input);
$short_url->SetFormat($this->object_with_short_url->GetShortUrlFormat());
$short_url->SetParameterValuesFromObject($this->object_with_short_url);
$manager = new ShortUrlManager($this->GetSiteSettings(), $this->GetDataConnection());
$taken = $manager->IsUrlTaken($short_url);
unset($manager);
return !$taken;
}