protected function createOptionResolver($name)
    {
        $resolverName = ucfirst($name) . 'OptionResolver';

        if(!isset($this->optionResolvers[$resolverName])) {
            $className = "\\Wangjian\\PinganPay\\OptionResolver\\$resolverName";
            $this->optionResolvers[$resolverName] = new $className();
        }

        return $this->optionResolvers[$resolverName];
    }