protected static function _getMessages($type = null)
{
$list = array();
if ($type !== null && isset(self::$_messages[$type])) {
$list = self::$_messages[$type];
self::$_messages[$type] = array();
} else {
$list = self::$_messages;
self::$_messages = array(self::MESSAGE_SUCCESS => array(), self::MESSAGE_ERROR => array());
}
self::_saveMessages();
return $list;
}
