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o reinforce the concepts we have discussed thus far, let s consider an application that deals with several customer orders. The application processes the orders and sends appropriate responses back to the customers. All the orders the system processes are logged and can be used for future reference. Let s also assume that the system requires flexibility in terms of logging so that it can decide to log only orders with product codes falling within a certain range. The application will typically pass to the logging framework the order information to be printed. From a design point of view, the application will need to keep the logging methods generic and will have configurable appenders, filters, layouts, etc. The application will use certain Logger(s), each of which will have its own set of appenders, filters, and layouts. It will be possible to change logging behavior completely by switching the Logger being used or by changing the associated appenders, filters, and layouts. This design will offer more flexibility for and maintainability of the system. From the logging point of view, this system will need the following objects to be in place: CustomerOrder: This object will hold the basic information about the order each customer is placing. ProductFilter: This object is capable of filtering the logging information based on a predefined product code range. OrderRenderer: This object is capable of rendering the CustomerOrder object as a String representation. Listing 7-1, CustomerOrder.java, represents the business object that holds the customer order information. Listing 7-1. CustomerOrder.java package com.apress.business; public class CustomerOrder { /** Holds value of property productName. */ private String productName; /** Holds value of property productCode. */ private int productCode;

All you have to do is run though and return an appropriate default value from each one of the functions, and you ll have a working IWebPart interface implementation, complete with default values specific to your Web Part This is a whole lot easier than having to continually set up the same properties and fields in a Web Part Finally, the WebPartUserControl also gives you access to the GenericWebPart object that represents the UserControl in the Web Part Framework by means of WebPartData property This property gives you access to a variety of other Web Part properties outside of the IWebPart interface, such as the desired Width and Height, HelpUrl, Zone, ZoneIndex, and so on To acquire a reference to the GenericWebPart, the WebPartData property uses WebPartManagerGet CurrentWebPartManager(Page) to locate the WebPartManager control for the page Then the property calls GetGenericWebPart(Me), passing in a reference to the current UserControl.

The WebPartManager looks through all the GenericWebParts on the page until it finds the one representing the current UserControl and returns the GenericWebPart as a result of the function or nothing if no match was found Other than that, the rest of the class is just a series of simple property implementations..

The line gcc -o myapp $(OBJ) $(LIB) will be expanded as follows: gcc -o myapp file1o file2o .. -lc -lm -Lpath1 -Lpath2 This will produce the final binary myapp, which can then be run from the console This works fine for a x86 PC system However, it will not work in an Android device for several reasons One is that the GCC produces binary files for an x86 architecture; desktop binaries will not run in an ARM processor (This could be easily fixed by replacing gcc with arm-none-linux-gnueabi-gcc) Another problem is that commands such as arm-none-linux-gnueabi-gcc -c file1c -Ifolder1 Ifolder2 .. will compile the source code using standard header files (for the C runtime and others) bundled with the toolchain Depending on the version you are using, this could cause undesired side effects, such as missing symbols at linkage time.

DateTimeWebPart.ascx (UserControl Markup)

/** Holds value of property productPrice. */ private int productPrice; /** Creates a new instance of CustomerOrder */ public CustomerOrder() { } public CustomerOrder(String name, int code, int price) { this.productCode = code; this.productPrice = price; this.productName = name; }

Because the Date/Time Display Web Part is extremely simple, it does not require many controls to implement. Listing 7-21 is the entire markup for the DateDisplayWebPart.ascx file.