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JavaScript has an Error object and is often used in conjunction with try/catch blocks. However, this is a generic Error object used to encapsulate all types of errors and report them to the user. The ASP.NET AJAX client library Error extension provides support for some degree of typed exceptions on the client. It contains some of the commonly typed exceptions found in the .NET Framework. The Error extension allows developers to not only handle exceptions based on the type of the error generated but also manually throw errors of a certain type as needed. The ASP.NET AJAX client library takes care of all necessary work required to properly serialize these typed errors into and from JSON. When using the Error extension to throw

Figure 3-2. Clicking either of the buttons on the page loads the XML document from the server and displays the appropriate results in an alert box.

completion, and design error detection, which can sometimes be tedious to support with the framework approach since these tools perform less type checking. Although the language and framework approaches sometimes compete, our feeling is that they should be seen as complementary, since they have very different properties. The work done with AspectJ 5, which aims to integrate the AspectJ language and the AspectWerkz framework, is a step in the right direction. However, a lot of work is still needed to create an ideal tool that cleanly integrates the fexibility of frameworks and the type-checking capabilities of languages.

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an exception, a new type of exception based on the underlying exception type in the Sys namespace (discussed in a later section in this chapter) is generated. You can even generate custom errors and make specific references pertaining to the original source of the error. Table 4-4 lists all ten of the supported static methods of the Error extension.

esign patterns offer generic solutions for recurring design problems. Most developers who use object-oriented programming are familiar with their use. Patterns are not specific to a particular language; in fact, most of the problems they tackle are not even specific to a particular programming paradigm. Consequently, many design problems usually resolved through object-oriented programming can be solved using AOP. The core design patterns became popular in 1995 with Addison-Wesley s publishing of Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (commonly known as the Gang of Four, or GoF). Although several other design patterns have been defined since then, most are based on this work. This chapter aims to redefine selected design patterns with the aspect-oriented approach. We compare these redefined patterns with their object-oriented definitions so that the advantages of AOP will be highlighted. The first section of this chapter gives a quick introduction to these reusable models. We then present and discuss the design patterns that show the most significant modularity improvements with an AOP implementation.

Listing 3-4 shows parseXML.html. Listing 3-4. parseXML.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Parsing XML Responses with the W3C DOM</title> <script type="text/javascript"> var xmlHttp; var requestType = ""; function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } }

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Design patterns are one approach for reusability, which is one of the key concepts of objectoriented programming. The idea of a pattern is not unique to programming; in fact, the idea stems from a similar concept that is used in architecture and town planning, an idea formalized by architect Christopher Alexander. The ideas were adapted to object-oriented programming by Ward Cunningham and Ken Beck in their article Using Pattern Languages for Object-Oriented Programs, which was presented in 1987 at a conference in Orlando, Florida. As stated previously, design patterns offer generic solutions to recurrent problems in specific contexts. The context in which a design pattern is used is important because a problem may be solved differently depending on the context. A good quality design pattern must be the abstraction of a concrete and well-tested solution. A design pattern must be well documented if it is to be used efficiently. Several catalogues of design patterns are available, the GoF book being the most well known. Each catalogue is split into sections that contain descriptions of the design patterns.

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