AddToListAction


1   /*
2   @COPYRIGHT@
3   */
4   package demo.tasklist.action;
5   
6   import demo.tasklist.common.Constants;
7   import demo.tasklist.form.AddToListForm;
8   import demo.tasklist.service.DataKeeper;
9   import demo.tasklist.service.ErrorKeeper;
10  import javax.servlet.http.HttpServletRequest  ;
11  import javax.servlet.http.HttpServletResponse  ;
12  import javax.servlet.http.HttpSession  ;
13  import org.apache.struts.action.Action;
14  import org.apache.struts.action.ActionForm;
15  import org.apache.struts.action.ActionForward;
16  import org.apache.struts.action.ActionMapping;
17  
18  /**
19   * AddToListAction processes the request to add an item to the task list.  
20   * Task list is fetched from the HttpSession object, the item indicated in 
21   * the AddToListForm is added to the list, and the modified list is loaded back 
22   * into the HttpSession object.
23   */
24  public class AddToListAction extends Action {
25    public ActionForward execute(ActionMapping mapping,
26                                 ActionForm form,
27                                 HttpServletRequest   request,
28                                 HttpServletResponse   response)
29      throws Exception   {
30      HttpSession   session = (HttpSession  )request.getSession();
31  
32      AddToListForm addToListForm = (AddToListForm) form;
33      String   newListItem = addToListForm.getNewListItem();
34      String   errorMsg = addToListForm.getErrorMsg();
35  
36      if(errorMsg != null) {
37        session.setAttribute(Constants.ERROR_KEY, new ErrorKeeper(errorMsg));
38      } else {
39        session.removeAttribute(Constants.ERROR_KEY);
40      }
41        
42      DataKeeper dkeeper = (DataKeeper)session.getAttribute( Constants.DATA_KEY);
43      if (dkeeper == null) {
44        dkeeper = new DataKeeper();
45      }
46      dkeeper.addListItem(newListItem);
47        
48      session.setAttribute( Constants.DATA_KEY, dkeeper );
49            
50      return mapping.findForward(Constants.SUCCESS_KEY ); 
51    }
52  }
53
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