protected function getCSSClassNames()
    {
        $classes = array('swat-tool-link');

        if (!$this->isSensitive()) {
            $classes[] = 'swat-tool-link-insensitive';
        }

        if ($this->stock_class !== null) {
            $classes[] = $this->stock_class;
        }

        $classes = array_merge($classes, $this->classes);

        return $classes;
    }