public Map act(Redirector redirector,
    SourceResolver resolver,
    Map objectModel,
    String source,
    Parameters param) throws Exception 
{
           
        Request request = ObjectModelHelper.getRequest(objectModel);
        Map map = new HashMap();
        map.put(MAP_URI, request.getRequestURI());
        String query = request.getQueryString();
        if (query != null && query.length()  > 0) {
            map.put(MAP_QUERY, "?" + query);
        } else {
            map.put(MAP_QUERY, "");
        }
        map.put(MAP_CONTEXTPATH, request.getContextPath());
        if ("true".equalsIgnoreCase(param.getParameter(PARAM_PARAMETERS, null))) {
            Enumeration e = request.getParameterNames();
            while (e.hasMoreElements()) {
                String name = (String)e.nextElement();
                String value = request.getParameter(name);
                if (value != null && !map.containsKey(name)) {
                    map.put(name, value);
                }
            }
            String[] paramNames = param.getNames();
            for (int i = 0; i <  paramNames.length; i++) {
                if (paramNames[i].startsWith(PARAM_DEFAULT_PREFIX)
                        && (request.getParameter(paramNames[i].substring(PARAM_DEFAULT_PREFIX.length())) == null)) {
                    map.put(paramNames[i].substring(PARAM_DEFAULT_PREFIX.length()),
                            param.getParameter(paramNames[i]));
                }
            }
        }
        return (map);
}