/* */package com.sun.j2ee.workflow.control.actions;import java.util.HashMap;import java.util.ArrayList;import java.util.Enumeration;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import com.sun.j2ee.workflow.control.exceptions.WorkflowAppException;import com.sun.j2ee.workflow.util.WebKeys;import com.sun.j2ee.workflow.util.Debug;import com.sun.j2ee.workflow.control.web.UserBean;/** SigninFlow Handler * @author Jian (James) Cai */public class SigninFlowHandler implements FlowHandler {    public void doStart(HttpServletRequest request) {    }    public String processFlow(HttpServletRequest request) throws WorkflowAppException {        Debug.println("SigninFlowHandler:processRequest");        HttpSession session = request.getSession();        UserBean user = getUserBean(session);        String nextScreen = null;        if (user.isLoggedIn()) {            String targetScreen = (String)session.getAttribute(WebKeys.SigninTargetURL);            if (targetScreen != null) return "TARGET_URL";            else return "1";        } else {            return nextScreen = "2";        }    }    public void doEnd(HttpServletRequest request) {    }        public UserBean getUserBean(HttpSession session) {        UserBean user = (UserBean)        session.getAttribute(WebKeys.UserBeanKey);        if (user == null) {            user = new UserBean();            session.setAttribute(WebKeys.UserBeanKey, user);        }        return user;    }}