DisplayUserListAction


1   /*
2   @COPYRIGHT@
3   */
4   package demo.tasklist.action;
5   
6   import demo.tasklist.common.Constants;
7   import demo.tasklist.service.DataKeeper;
8   import demo.tasklist.service.ErrorKeeper;
9   import javax.servlet.http.HttpServletRequest  ;
10  import javax.servlet.http.HttpServletResponse  ;
11  import javax.servlet.http.HttpSession  ;
12  import org.apache.struts.action.Action;
13  import org.apache.struts.action.ActionForm;
14  import org.apache.struts.action.ActionForward;
15  import org.apache.struts.action.ActionMapping;
16  import org.apache.struts.action.DynaActionForm;
17  
18  /**
19   * DisplayUserListAction processes the request to display the task list.
20   * Task list is fetched from the HttpSession object, and a dynamic form 
21   * (i.e., displayUserListForm) is populated with this data.
22   */
23  public class DisplayUserListAction extends Action {
24    public ActionForward execute( ActionMapping mapping, ActionForm form,
25      HttpServletRequest   request, HttpServletResponse   response) throws Exception   {
26      HttpSession   session = request.getSession();
27      ErrorKeeper errorKeeper = (ErrorKeeper) session.getAttribute(Constants.ERROR_KEY);
28      String   errorMsg = errorKeeper != null ? errorKeeper.getErrorMsg() : "";
29        
30      if(errorMsg == null) {
31        errorMsg = "";
32      }
33             
34      DataKeeper dkeeper = (DataKeeper) session.getAttribute(Constants.DATA_KEY );
35      if (dkeeper == null) {
36        dkeeper = new DataKeeper();
37      }
38      String   numTasks = Integer.toString(dkeeper.getListSize());
39  
40      ((DynaActionForm)form).set( "userList", dkeeper.getList());
41      ((DynaActionForm)form).set( "numTasks", numTasks);
42      ((DynaActionForm)form).set( "errorMsg", errorMsg);
43  
44      return mapping.findForward( Constants.SUCCESS_KEY );
45    }
46  }
47
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