package com.andowson.onlineuser;



import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;



/**

 * UserTraceFilter

 *

 * @version 0.0.1 2004/12/22

 * @author Andowson Chang

 */

public class UserTraceFilter implements Filter {



    protected FilterConfig filterConfig;

    private final static String FILTER_APPLIED = "_usertrace_filter_applied";



    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        // Ensure that filter is only applied once per session.

        HttpSession session = ((HttpServletRequest) request).getSession();

        if (session.getAttribute(FILTER_APPLIED) == null) {

            System.out.println("Applying usertrace filter to request.");

            session.setAttribute(FILTER_APPLIED, Boolean.TRUE);

            

            UserTrace user = new UserTrace();

            user.addRequest((HttpServletRequest) request);

            /*System.out.println("sessionId: " + user.getSessionId());

	  	      System.out.println("username: " + user.getUsername());

	  	      System.out.println("hostname: " + user.getHostname());

	  	      System.out.println("start: " + user.getStart());

	  	      System.out.println("lastRequest: " + user.getLastRequest());*/

            session.setAttribute("user", user);

        }

        else {

            System.out.println("Usertrace filter already applied, ignoring it.");

        }

        // pass the request on

        chain.doFilter(request, response);

    }



    public void init(FilterConfig filterConfig) throws ServletException {

        this.filterConfig = filterConfig;

    }



    public void destroy() {

    }

}