public String getInfo() 
{
    // ------------------------------------------------------------- Properties
        return (info);
}

Return descriptive information about this Valve implementation.

 public  void invoke(Request request,
    Response response) throws IOException, ServletException 
{
        process(request.getRequest().getRemoteHost(), request, response);
}

Extract the desired request property, and pass it (along with the specified request and response objects) to the protected process() method to perform the actual filtering. This method must be implemented by a concrete subclass.