print barcode in asp.net c# Figure 13.14 The security prompt notifies the user about the request for access rights. in Java

Creation QR in Java Figure 13.14 The security prompt notifies the user about the request for access rights.

Figure 13.14 The security prompt notifies the user about the request for access rights.
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Refactoring
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access XML feeds from any site without having to open multiple tabs or windows by using this reader. We also have the ability to alter this application to obtain other information from the Web, such as weather and comics.
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13.6.2 Changing the application scope
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This application is not limited to being an XML syndication reader from sites. We can easily adapt it as a banner ad rotator, company news updater, an event calendar, and so much more. For instance, we can store our banner ads within an XML document. That way, anyone can update the XML file with new ads without having to touch any of the HTML files or the server-side code. We can preload the banner ads and have them displayed in the reader. Instead of just having one ad on the screen, we can have them rotate through as the user is reading the site. We can set up the XML document to hold the company news so we can display our current articles to the employees or customers. We just need to fill in the basic items of the XML feed. We can also make it display the updates to the site or any other information we want. As you can see, we are not limited to just the plain XML feeds.
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13.7 Refactoring
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Now that we have a fully developed script for reading RSS feeds, let s take the time once again to improve upon our efforts. As mentioned earlier, there are lots of possibilities for extending our script in terms of perusing different types of content. In this section, we concentrate on reorganizing the script along ModelView-Controller (MVC) boundaries. As we explained in chapters 3 and 4, the MVC pattern is a very common design pattern for separating the responsibilities of software. We ll start our discussion with defining the Model types, then we ll create a View for the Model, and finally we ll round out the discussion with the Controller that ties everything together.
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13.7.1 RSS reader Model
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The RSS reader we ve developed in this example will definitely benefit from having some first-class Model types to deal with. This will make the software conceptually cleaner and easier to read and maintain. With Ajax-based applications putting a heavier emphasis on the client DHTML than more traditional web applications, it becomes increasingly important to write clean, maintainable software. The Model classes we develop should also be generally applicable to other
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applications that deal with RSS feeds. As a syntactic simplification, we ll use the Prototype library to define types just as we did in chapter 10. Let s start by defining a Model class for an RSS feed. An RSS feed is for our purposes an XML document that adheres to a predefined structure and has a URL that specifies how it can be accessed. The primary attributes of the structure are the title, link, and description, with many other optional attributes, as discussed earlier. The feed also has several items, which can be thought of as the articles of its content. Let s start by capturing what we know so far, as represented in listing 13.21.
Listing 13.21 The RSSFeed Model class
RSSFeed = Class.create(); RSSFeed.prototype = { initialize: function( this.title = this.link = this.description = this.items = }, title, link, description ) { title; link; description; [];
addItem: function(anItem) { this.items.push(anItem); } };
This code defines the RSSFeed type via the Prototype library Class.create(). You will recall that using this idiom, the initialize method is invoked by the generated constructor. So with this definition of our RSS feed Model class, a feed could be constructed via the following line of code:
var rssFeed = new RSSFeed( 'JavaRanch News', 'http://radio.javaranch.com/news/', 'Stories from around the ranch' );
This is pretty much all that s required for the definition of an RSSFeed Model object. Notice that the RSSFeed has an addItem API that enables the addition of items to the internal item s array. Each item should be a Model object as well one that encapsulates the attributes of each item in the feed. Given what we know about the RSS items, let s define our item Model class as shown in listing 13.22.
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