protected function checkContent()
    {
        if (is_array($this->content) && count($this->content)) {
            foreach ($this->content as $name => $value) {
                switch ($name) {
                    case 'category':
                    case 'mainMessage':
                    case 'buttonMessage':
                    case 'language':
                        $this->addContentOption($name, $value);
                        break;
                    case 'mainParams':
                    case 'buttonParams':
                        $this->addParamsOption($name, $value);
                        break;
                }
            }
        }
    }