protected function buildSPIUrlAlias(URLAlias $urlAlias)
    {
        return new SPIURLAlias(
            array(
                'id' => $urlAlias->id,
                'type' => $urlAlias->type,
                'destination' => $urlAlias->destination,
                'isCustom' => $urlAlias->isCustom,
            )
        );
    }