public static function getAdapters()
    {
        static $adapterNames = array(
            // currently supported by Piwik
            'Pdo\Mysql',
            'Mysqli',

            // other adapters supported by Zend_Db
//			'Pdo_Pgsql',
//			'Pdo_Mssql',
//			'Sqlsrv',
//			'Pdo_Ibm',
//			'Db2',
//			'Pdo_Oci',
//			'Oracle',
        );

        $adapters = array();

        foreach ($adapterNames as $adapterName) {
            $className = '\Piwik\Db\Adapter\\' . $adapterName;
            if (call_user_func(array($className, 'isEnabled'))) {
                $adapters[strtoupper($adapterName)] = call_user_func(array($className, 'getDefaultPort'));
            }
        }

        return $adapters;
    }