import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class UserManager {
    /** Session variable pointing to a user object */
    public static final String SESSION_MEMBER = "user";

    /** Indicates currently logged in (could be just visiting site) */
    public static final String SESSION_LOGGEDIN = "loggedin";

    public static void login(HttpSession session, User user)
    {
	session.putValue(SESSION_LOGGEDIN, "true");
	session.putValue(SESSION_MEMBER, user);
    }

    public static void logout(HttpSession session) {
	session.removeValue(SESSION_LOGGEDIN);
	session.removeValue(SESSION_MEMBER);
	session.invalidate();
    }
}