public function run( $credentials )
    {
        $status = self::STATUS_INVALID_USER;
        $count = eZPersistentObject::count( eZUser::definition(), array( 'contentobject_id' => (int)$credentials->id ) );
        if ( $count > 0 )
        {
            $status = self::STATUS_OK;
        }

        return $status;
    }