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runtime changes difficult. And even compile-time changes are hard: if the layer supertype changes, all derivations must change. In cases like these, we favor composition over inheritance. By extending the default ControllerActionInvoker (mentioned briefly in chapter 9) we can compose action filters at runtime without using attributes on actions, controllers, or a layer supertype controller. In listing 19.5 we extend ControllerActionInvoker to allow us to apply action filters without attributes.
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Appendix: Answers to Quizzes and Exercises
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Figure 16.7 Converting audio files in the terminal
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If you run this main() method (don t try this now you still need to configure Hibernate), the output on your console is as follows:
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public-read var sPublicReadDefault:String; public-read package var sPublicReadPackage:String; public-init protected var sPublicInitProtected:String; init { println("sDefault = {this.sDefault}"); println("sPackage = {this.sPackage}"); println("sProtected = {this.sProtected}");
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Context.MODE_PRIVATE (value 0) Context.MODE_WORLD_READABLE (value 1) Context.MODE_WORLD_WRITEABLE (value 2)
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An image consists of a series of pixels, and each pixel has a color. The color value of the sequence of pixels can be stored in a byte array, and the byte array can be compressed, for instance using zlib/flate compression. Figure 10.6 shows images that were created byte by byte.
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that are generalized in Mammal, but to differ in those characteristics that are specialized in cats. The specialization and generalization relationships are both reciprocal and hierarchical. Specialization is just generalization in the opposite direction: Mammal generalizes what is common among dogs and cats, and dogs and cats specialize mammals to their own specific subtypes. These relationships are hierarchical because they create a relationship tree, with specialized types branching off from more generalized types. As you move up the hierarchy, you achieve greater generalization. You move up toward Mammal to generalize that dogs, cats, and horses all bear live young. As you move down the hierarchy, you specialize. Thus, the cat specializes Mammal in having claws (a characteristic) and purring (a behavior). To use a more programming-specific example, every widget that you see in a standard Windows interface is called a control. So, when you say that ListBox and Button are Controls, you indicate that there are characteristics and behaviors of Controls that you expect to find in both of these types. In other words, Control generalizes the shared characteristics of both ListBox and Button, while each specializes its own particular characteristics and behaviors. To put it another way, all Controls, which includes ListBoxes and Buttons, have certain common behaviors they re all drawn on the screen, for one thing. But a Button can be clicked, which a ListBox can t. A ListBox has contents, which can be sorted. A Button can t do that. The Unified Modeling Language (UML) is a standardized language for describing an object-oriented system. UML has many different visual representations, but in this case, all you need to know is that classes are represented as boxes. The name of the class appears at the top of the box, and (optionally) methods and members can be listed in the sections within the box. You can use UML to model specialization relationships, as shown in Figure 11-1. Note that the arrow points from the more specialized class up to the more general class. In the figure, the more specialized Button and ListBox classes point up to the more general Control class. When you start out designing classes from scratch, you ll often find that you have several classes that do the same thing. When this occurs, you can factor out these commonalities into a shared base class, which is more general than the specialized classes. This factoring is beneficial to you, because it allows you to reuse common code, and anytime you can reuse code instead of copying it to a new class is a good thing. That gives you code that is easier to maintain, because the changes are located in a single class rather than scattered among numerous classes. For example, suppose you started out creating a series of objects, as illustrated in Figure 11-2. After working with RadioButtons, CheckBoxes, and Command buttons for a
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<%@ Master Language="C#" Inherits="System.Web.Mvc.ViewMasterPage" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" ""> <html xmlns=""> <head runat="server"> <title> <asp:ContentPlaceHolder ID="TitleContent" runat="server" /> </title> <link href="../../Content/Site.css" rel="stylesheet" type="text/css" /> </head> <body> <div class="page"> <div id="header"> <div id="title"> <h1>My MVC Application</h1>
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Using the connection Returning the connection
value of current when the trigger is activated, and newVal will contain the updated value. We use the old value to populate a second variable, previous, ensuring it is always one step behind current. Note: the equals sign used as part of the on replace construct is just a separator, not an assignment. I suppose oldVal and newVal could have been separated by a comma, but the language designers presumably thought the equals sign was more intuitive. The code block is called after the variable is updated, so newVal is already in place when our code starts. Actually, we could have just read current instead of newVal. For convenience, the trigger syntax can be abbreviated, as shown in listing 3.30.
An application like Pageflakes relies heavily on user interaction. In addition, the page needs to be light, effective, and mindful of system resources. For these reasons, a client-centric approach is the preferred model.
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RestaurantFinderApplication application = (RestaurantFinderApplication) getApplication(); application.setReviewCriteriaCuisine( this.cuisine.getSelectedItem().toString()); application.setReviewCriteriaLocation( this.location.getText().toString()); Intent intent = new Intent(Constants.INTENT_ACTION_VIEW_LIST); startActivity(intent);
Listing 1.1 Basic Html layout for the Default.aspx page
Asserts correct results Creates ActionExecutingContext
The last line in that code block shows a reference type String being assigned the String result of a function. You can also assign a brand-new instance of a reference instance to a reference type variable. And it s new. That is, it uses the special New keyword, which says, I m creating a new instance of the specific data type. There are a few different variations, but they all produce the same results.
Installing ASP.NET AJAX
We cover methods in detail in 8, but we mention them in virtually every chapter in this book. A comment (shown here in bold) appears just after the start of the Main( ) method:
In JMS, a message is a Java object with two parts: a header and a message body. The header is composed of delivery information and metadata, and the message body carries the application data, which can take several forms: text, Serializable objects, byte streams, etc. The JMS API defines several message types (TextMessage, MapMessage, ObjectMessage, and others) and provides methods for delivering messages to and receiving from other applications. For example, we can send a new user registration using a MapMessage:
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