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Figure 5-1 Two complete boards of the Dungeon game It s not hard to compact data if you know a bit about byte arithmetic And Java Micro Edition (Java ME) programmers naturally need to use byte arithmetic more than the average Java programmer Recall that you use the bitwise or operator for placing strings and images (see the Using the Graphics and Canvas Classes section in 2) and for layout directives (see the Using the Form and Item Classes section, also in 2), and you use a bitwise and operator to get all the information about the current key states (see the Using the GameCanvas Class section in 3) Another useful tool for bitwise arithmetic is the shift operator.

The Common assembly supports two major functions for the Enterprise Library application blocks. First, it provides a series of helper classes to assist in the management of configuration data. Second, it provides support for instrumentation for the various Enterprise Library application blocks. Here, we ll look at the configuration features. The instrumentation features are covered later in the chapter. As noted in earlier chapters, a major change from Enterprise Library for .NET Framework 1.1 is the removal of the Configuration Application Block. The main reason for the removal of this application block is that the new configuration features inside .NET Framework 2.0 and 3.0 allow for many of the features that were provided by the Configuration Application Block. The new Enterprise Library configuration features rely on the new ConfigurationSection class in the .NET Framework 2.0 and 3.0 System.Configuration namespace. The ConfigurationSection class provides methods and properties that represent a custom configuration section within a configuration file.

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9. Save and close this file; also close the file browser and the Bluetooth Devices dialog. If you have BricxCC open, close it and reopen it. Now, you should find the newly connected NXT in the left drop-down list in the Find Brick form. Click OK and BricxCC will get connected to your NXT in just a few seconds. It was laborious, but your efforts will be repaid! This time it takes just a moment to connect your NXT via Bluetooth. You can repeat the whole procedure to add all the NXT devices you want. At this point, you are online with your brick. Let me show you what can be done now.

To completely understand how Enterprise Library uses these new .NET Framework configuration features, it is important to understand the features themselves. Listings 4-1 through 4-4 demonstrate how to define a custom configuration section within an XML file (whether it is the application configuration or a stand-alone file), how to implement the code to serialize and deserialize XML data into inherited instances of the ConfigurationSection class, and how to utilize that custom configuration data within a simple console application. Listing 4-1 shows what a custom configuration section might look like within a configuration file. Listing 4-1. Sample Configuration File: myCustom.config < xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="myCustomSection" type="Samples.MyCustomSection, Samples, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" allowDefinition="Everywhere" allowExeDefinition="MachineToApplication" restartOnExternalChanges="true" /> </configSections> <myCustomSection myFirstSetting="1" mySecondSetting="A" /> </configuration> With the configuration file created, the next step is to be able to deserialize this information into something useful within an application. Listing 4-2 demonstrates how to inherit from the ConfigurationSection class to utilize the custom configuration section in Listing 4-1 using the programmatic model. Listing 4-2. Inherited ConfigurationSection Class Using the Programmatic Model using System.Configuration; public sealed class MyCustomSection : ConfigurationSection { // The collection (property bag) that contains the section properties. private static ConfigurationPropertyCollection m_Properties; // The myFirstSetting property. private static readonly ConfigurationProperty m_MyFirstSetting = new ConfigurationProperty("myFirstSetting", typeof(long), (long) 1, ConfigurationPropertyOptions.IsRequired); // The mySecondSetting property. private static readonly ConfigurationProperty m_MySecondSetting = new ConfigurationProperty("mySecondSetting", typeof(string), "A", ConfigurationPropertyOptions.IsRequired); // CustomSection constructor.

The shift operators are written in Java code as >> and <<, where the operand on the left is the byte to shift and the operand on the right is the number of places to shift it They have the effect of multiplying the value of the byte by a power of 2 For example, the result of myval >> 1 is the same as dividing myval by 2 All the shift operator is really doing is moving the values of the byte shifting them all in unison to the left or to the right so they can be used to make it easier to access each individual value (1 or 0) in the byte.

public MyCustomSection() { // Property initialization m_Properties = new ConfigurationPropertyCollection(); m_Properties.Add(m_MyFirstSetting); m_Properties.Add(m_MySecondSetting); }

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