signature.append("(");
            if (matcher.group(5).length() > 0) {
                String[] types = PARAM_DELIMITER.split(matcher.group(5));
                for (int i = 0; i < types.length; i++) {
                    String type = types[i];
                    Matcher typeMatcher = TYPE_PATTERN.matcher(type);
                    if (!typeMatcher.matches()) {
                        return null;
                    }