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The formatting of logging information is important. On one hand, the more information, the better. On the other hand, each bit of information costs CPU memory. We need to carefully determine the formatting of logging information. XML formatting is costlier than simple textbased output, but the benefit of XML-formatted logging information is that it s more reusable and portable. PatternLayout objects in log4j provide extreme flexibility in terms of defining the elements of the final logging information and the formatting instructions. Using PatternLayout, we can precisely control the content of the logging information in any destination. For XML/HTMLbased logging information, we need to use separate Layout objects. PatternLayout is responsible for formatting the content of the logging information and is not involved in the presentation of that information. Dates are one of the main concerns when it comes to formatting, as they are complicated and slow down the logging performance. The log4j API provides several date formatting objects such as DateLayout and ISO8601DateFormat. The ISO8601DateFormat is the cheapest and fastest of all the date formats available.

You may be wondering why the DateRangeSearch function accepts string representations of the start and end dates instead of actual date types. The reasoning is that this function is designed for use with web-based applications, and web-based applications usually acquire dates as strings. Thus, the DateRangeSearch function encapsulates the logic for converting those strings into dates. Listing 8-19 is a simple example of how to use the DateRangeSearch function. Assume there are three text boxes named txtCustomerID, txtStartDate, and txtEndDate; a GridView control named myGrid; and a button named btnDateRangeQuery: Listing 8-19. CreateDateRange Function Example '*************************************************************************** Protected Sub btnDateRangeQuery_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles btnDateRangeQuery.Click Dim sqlQueryObj As New Reporting.SqlQuery Dim dbConn As New SqlConnection( _ ConnectionStrings("Northwind").ConnectionString) Dim dbCmd As SqlCommand Dim dr As SqlDataReader sqlQueryObj.From = "Orders" If Not Me.txtCustomerID.Text = String.Empty Then sqlQueryObj.Where.AddCondition( _ String.Format("CustomerID='{0}'", txtCustomerID.Text)) End If sqlQueryObj.Where.And() sqlQueryObj.Where.CreateDateRange(Me.txtStartDate.Text, _ Me.txtEndDate.Text, "OrderDate", _ Reporting.SqlEvaluationType.Inclusive, "MM/dd/yyyy")

dbConn.Open() dbCmd = New SqlCommand(SqlQueryObj.GetQuery(), dbConn) dr = dbCmd.ExecuteReader() myGrid.DataSource = dr myGrid.DataSource.DataBind() dr.Close() dbConn.Close() End Sub Listing 8-19 demonstrates how you can pass text directly into the CreateDateRange function, and how you can apply conditional logic to the SqlConditionGroup added by function. Take note of the sqlQueryObj.Where.And() call in the code. This means that if both the CustomerID and a date range are specified, then only rows matching the CustomerID AND the date range will be returned. If the sqlQueryObj.Where.Or() had been called, then OR logic would apply. Now let s move on to another useful search feature, the CreateKeywords function.

We have also looked at custom touch screen controls for phones that do not have a keyboard. You saw that the native interface class has callback listeners for clients that wish to receive C to Java callbacks, native methods invoked through JNI to start the game loop and send key and motion event information to the Native library, and C to Java callbacks used to delegate engine messages to the listener activity. We have looked at the native layer that glues the Java and C code together and provides the native method implementations. Changes to the original code are also required to remove invalid dependencies and insert the C to Java callbacks. Finally, you saw the Makefile required to compile the Native library and the IDE launch configuration to test the game in the emulator. Using the Java/C power combo, we have brought one of the great PC games, Doom, to the platform. Even though Google is pushing for Java-only development and provides little or no support for native development, Java alone is not the best choice when it comes to advanced mobile gaming. Java-only code works fine for the regular mobile app, but it is not enough for high-performance graphics. I hope that the material in this book has opened a new frontier for you to explore, and you re excited about the possibility of bringing thousands of PC games to Android with minimal time and effort.