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Listing A-9. Enumerations for Representing RSS Tags and Attributes public enum RssElements { Rss,Channel,Title,Description,Link,Copyright,Generator,Item,PubDate } public enum RssAttributes { Version } The RssElements enumeration contains values for representing RSS elements. The RssAttributes enumeration contains just one value Version that represents the version attribute of the <rss> element.

<Window x:Class="WPFIntro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPFIntro" Height="300" Width="300"> <Grid> <Button Content="Hello, Web.Next Readers!" /> </Grid> </Window>

Portlets are allowed to be displayed in the three standard modes VIEW, EDIT, and HELP. They do not have to support any of them except VIEW. Many do not require any action handling. This results in a lot of boilerplate code to handle the requests for each of these modes and render the response. The GenericPortlet abstract class therefore provides an initial framework around which you can build your custom portlet. At its simplest, a portlet derived from GenericPortlet must implement a constructor, a getTitle() method, and a doView() method. GenericPortlet then provides your application with a variety of helper methods that you will make frequent use of. It is generally recommended that you override GenericPortlet rather than directly creating your own implementation of the Portlet interface. GenericPortlet s render() method calls the doDispatch() method. This method determines the current mode of the portlet render request, and calls doView(), doEdit(), and doHelp() as appropriate (the modes that are permissible for a portlet are configured in its deployment descriptor). The processAction() method throws

3

You can of course use multiple attributes to set multiple properties on the control. If you want to, for example, override the default background color, foreground color, and font type, you merely have to set the appropriate attributes on the <Button> element. Here s an example:

To emit the RSS feed, you need to write elements such as <rss> and <item> onto the output stream. We will create three methods for this purpose: WriteElement(), WriteElementString(), and WriteEndElement(). The complete code of these methods is shown in Listing A-10. Listing A-10. Writing Elements public void WriteStartElement(RssElements element) { string elementName = ""; switch (element) { case RssElements.Channel: elementName = "channel"; break; case RssElements.Copyright: elementName = "copyright"; break; case RssElements.Description: elementName = "description"; break; case RssElements.Generator: elementName = "generator"; break; case RssElements.Item: elementName = "item"; break;

an exception if invoked, so your class must override this if you wish to handle any actions. Since our crawler portlet provides only a view method and does not accept any actions, GenericPortlet provides the perfect starting point.

<Window x:Class="WPFIntro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPFIntro" Height="300" Width="300"> <Grid> <Button Background="Black" Foreground="White" FontFamily="Verdana" FontSize="20"

case RssElements.Link: elementName = "link"; break; case RssElements.PubDate: elementName = "pubDate"; break; case RssElements.Rss: elementName = "rss"; break; case RssElements.Title: elementName = "title"; break; } writer.WriteStartElement(elementName); } public void WriteElementString(RssElements element, string value) { string elementName = ""; switch (element) { case RssElements.Channel: elementName = "channel"; break; case RssElements.Copyright: elementName = "copyright"; break; case RssElements.Description: elementName = "description"; break; case RssElements.Generator: elementName = "generator"; break; case RssElements.Item: elementName = "item"; break; case RssElements.Link: elementName = "link"; break; case RssElements.PubDate: elementName = "pubDate"; break;

Our crawler overrides GenericPortlet; this will simplify the implementation of our very conventional design. The constructor is empty:

When programming in WPF and defining elements in XAML, you ll encounter many complex properties that cannot be expressed in a simple string. For these, XAML provides a sub-element syntax, called property element syntax, that allows you to define them. This works by using dot syntax to define a property element. This example shows how the dot syntax may be used for complex properties and the attribute syntax may be used for simple ones:

public CrawlerPortlet() { super(); }