public function success($message = null, $data = array(), $return = false)
    {
        if (!empty($data)) {
            foreach ($data as $key => $value) {
                $this->add($key, $value);
            }
        }
        $json = $this->jsonEncode(
            array(
                'success' => true,
                'message' => $message,
                'data' => $this->_data,
            )
        );
        if (!$return) {
            echo $json;
            Yii::app()->end();
        } else {
            return $json;
        }
    }