public final function toClass(string $class): ?array
    {
        $data = null;
        if (!empty($this->data)) {
            $data = $this->data;
            foreach ($data as &$dat) {
                $datClass = new $class();
                foreach ((array) $dat as $key => $value) {
                    $datClass->{$key} = $value;
                }
                $dat = $datClass;
            }
        }

        return $data;
    }