public function addParams($params)
    {
        if (isset($params['form_params'])) {
            $params = $params['form_params'];
            $params['form_token'] = drupal_get_token();
        } elseif (isset($params['query'])) {
            $params = $params['query'];
        }

        foreach ($params as $key => $value) {
            $this->params[$key] = $value;
        }

        return $this;
    }