protected String getPrefix(Context context) 
{
        // Identify the URI from which we will match a module prefix
        ServletWebContext swcontext = (ServletWebContext) context;
        HttpServletRequest request = swcontext.getRequest();
        String uri =
            (String) request.getAttribute(Constants.INCLUDE_SERVLET_PATH);
        if (uri == null) {
            uri = request.getServletPath();
        }
        if (uri == null) {
            throw new IllegalArgumentException
                ("No path information in request");
        }
        // Identify the module prefix for the current module
        String prefix = "";  // Initialize to default prefix
        String prefixes[] = (String[])
            swcontext.getApplicationScope().get(Globals.MODULE_PREFIXES_KEY);
        int lastSlash = 0;
        while (prefix.equals("") &&
               ((lastSlash = uri.lastIndexOf("/"))  > 0)) {
            uri = uri.substring(0, lastSlash);
            for (int i = 0; i <  prefixes.length; i++) {
                if (uri.equals(prefixes[i])) {
                    prefix = prefixes[i];
                    break;
                }
            }
        }
        return (prefix);
}