@Override
    public TagHandler childElement(String localName) throws SAXException {

        // Start parsing of authorize tags, add to list of all authorizations
        if (localName.equals("authorize"))
            return new AuthorizeTagHandler(user_mapping);

        return null;

    }
The UserMapping which will contain all data parsed by this tag handler.
guacamole/src/main/java/org/apache/guacamole/auth/file/UserMappingTagHandler.java