public function get($key, $default = null) {
        if (strpos($key, '.') === false) {
            $value = isset($this->_data[$key]) ? $this->_data[$key] : null;
        } else {
            $value = Hash::get($this->_data, $key);
        }

        if ($value === null) {
            return $default;
        }

        return $value;
    }