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public void processAction(ActionRequest request, ActionResponse response) throws PortletException, IOException { //retrieve the to do list out of the user's session PortletSession session = request.getPortletSession(true); //the to do list is just stored as an ArrayList here, because //we are not going to persist it to a database or other storage. ArrayList list = (ArrayList) session.getAttribute("ToDoList", PortletSession.APPLICATION_SCOPE); //if the list doesn't exist, create an empty one. if (list == null) { list = new ArrayList(); } //set up a very simple controller here, based on a //request parameter called COMMAND String command = request.getParameter("COMMAND"); String itemParam = request.getParameter("ITEM_ID");

class ElementWithLink : Element { public ElementWithLink (Element part, Element next) { Next = next; Part = part; } } } abstract class IVisitor { public void ReflectiveVisit(Element element) { // Use reflection to find and invoke the correct Visit method Type[] types = new Type[] {element.GetType( )}; MethodInfo methodInfo = this.GetType( ).GetMethod("Visit", types); if (methodInfo != null) methodInfo.Invoke(this, new object[] {element});

In addition, you ll see that the Default.aspx file created by the template will have a ScriptManager on it (see Figure 12-7).

int itemId = -1; if (itemParam != null) { itemId = Integer.parseInt(itemParam); } if ("MARK_FINISHED".equals(command)) { ToDoItemBean item = (ToDoItemBean) list.get(itemId); item.setStatus(true); } else if ("DELETE".equals(command)) { list.remove(itemId); } else if ("MARK_UNFINISHED".equals(command)) { ToDoItemBean item = (ToDoItemBean) list.get(itemId); item.setStatus(false); } else if ("EDIT".equals(command)) { ToDoItemBean item = (ToDoItemBean) list.get(itemId); String desc = request.getParameter("DESCRIPTION"); item.setDescription(desc); String priority = request.getParameter("PRIORITY"); if (priority != null) { try { int p = Integer.parseInt(priority); item.setPriority(p); } catch (NumberFormatException nfe) { getPortletContext().log( "Error trying to format " + priority + " as a number."); } } }

5

else Console.WriteLine("Unexpected Visit"); } } // Visitor class CountVisitor : IVisitor { public int Count {get; set;} public void CountElements(Element element) { ReflectiveVisit(element); if (element.Part!=null) CountElements(element.Part); if (element.Next!=null) CountElements(element.Next); } public void Visit(ElementWithLink element) { Console.WriteLine("Not counting"); } // Only Elements are counted public void Visit(Element element) { Count++; } } // Client class Client { static void Main( ) { // Set up the object structure Element objectStructure = new Element( new Element( new ElementWithLink( new Element( new Element( new ElementWithLink( new Element(null), new Element( null)))), new Element( new Element( new Element(null)))))); Console.WriteLine ("Count the elements"); CountVisitor visitor = new CountVisitor( ); visitor.CountElements(objectStructure); Console.WriteLine("Number of Elements is: "+visitor.Count); } } /* Count the elements Not counting Not counting Number of Elements is: 9 */

Now take a look at the source code for the default page you ll see the following, including the new <asp:ScriptManager> reference:

else if ("NEW".equals(command)) { ToDoItemBean item = new ToDoItemBean(); String desc = request.getParameter("DESCRIPTION"); if (desc == null) { return; } item.setDescription(desc); item.setStatus(false); item.setSubmittedDate(new java.util.Date()); item.setPriority(0); list.add(item); } session.setAttribute("ToDoList", list, PortletSession.APPLICATION_SCOPE); }

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Example1._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> </div> </form> </body> </html>

The doView() method includes the homePage.jsp file in the portlet s response. We cover this JSP page in the next section of this chapter. The doView() method gets a request dispatcher from the portlet context for the /WEB-INF/jsp/homePage.jsp file. Then the portlet calls the include() method on the request dispatcher to add the content of the JSP page to the response. The doView(), doEdit(), and doHelp() methods are all very similar, because all of the content and presentation logic is contained in the JSP pages.

See the following code for an example of the Interpreter Pattern:

protected void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException { response.setContentType("text/html"); PortletContext portletContext = getPortletContext(); PortletRequestDispatcher prd = portletContext.getRequestDispatcher("/WEB-INF/jsp/homePage.jsp"); prd.include(request, response); }

As you can see, this is a pretty straightforward ASP.NET page, with nothing new other than the fact that the ScriptManager control has been added. Now run the page and take a look at the source code that the browser sees. Here s an example:

The doEdit() method also dispatches the request to a JSP page, but it checks the request parameter named DISPLAY to determine which page to include. By default, it displays the /WEB-INF/jsp/editPage.jsp file, which allows the user to choose a to-do list item to edit. When the portlet is first called, or it is switched into the VIEW portlet mode, this is the page it will display. We can construct links in the JSP pages to set the request parameter named DISPLAY to a value, and we check to see if we need to display the portlet page that allows editing of an individual to-do list item: