Method getProductFilesByProductId

public static function getProductFilesByProductId($productId, $return = 0)
{
    $db = Factory::getDBO();
    $query = 'SELECT a.id, a.download_file, a.download_token, a.download_days';
    $query .= ' FROM #__phocacart_product_files AS a' . ' WHERE a.product_id = ' . (int) $productId . ' ORDER BY a.ordering';
    $db->setQuery($query);
    if ($return == 0) {
        return $db->loadObjectList();
    } else {
        if ($return == 1) {
            return $db->loadAssocList();
        } else {
            $files = $db->loadAssocList();
            $filesSubform = array();
            $i = 0;
            if (!empty($files)) {
                foreach ($files as $k => $v) {
                    $filesSubform['additional_download_files' . $i]['id'] = (string) $v['id'];
                    $filesSubform['additional_download_files' . $i]['download_file'] = (string) $v['download_file'];
                    $filesSubform['additional_download_files' . $i]['download_token'] = (string) $v['download_token'];
                    $filesSubform['additional_download_files' . $i]['download_days'] = (string) $v['download_days'];
                    $i++;
                }
            }
            return $filesSubform;
        }
    }
    return false;
}