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There is no doubt that the DataSet class provides rich XML functionality, but what if you need to do the following in your application Sort, filter, and bind the data effectively in your application Apply XSLT transformations and run XPath expressions Work with your XML data in a relational manner, still keeping its hierarchical nature intact All the preceding requirements call for a technique that will bridge the relational model of DataSet and the hierarchical model of XmlDocument, and the XmlDataDocument provides just such a bridge. It allows you to synchronize data from a DataSet and an XML document, and inherits from XmlDocument as the base class. Naturally, it provides all the functionality of DOM. An XmlDataDocument class can be constructed in two ways depending on your requirement: From a DataSet From an XML document

clientPassword); System.out.println("Logged in " + subject); serverContext = GSSContextUtil.createOutgoingGSSContext( subject, clientPrincipal, serverPrincipal); System.out.println( "Server context established:" + serverContext.isEstablished()); } public GSSContext handshake() throws Exception { System.out.println("Performing handshake"); serverContext.requestConf(true); serverContext.requestMutualAuth(true); serverContext.requestReplayDet(true); while (!serverContext.isEstablished()) { System.out.println("Exchanging tokens"); serverContext.initSecContext(input, output); output.flush(); } System.out.println("Handshake completed"); return serverContext; } private Socket socket; private GSSContext serverContext; private InputStream input; private OutputStream output; public static void main(String[] argv) throws Exception { AuthClient client = new AuthClient("192.168.0.5", 3000); System.out.println("Establish server context"); client.createContext("dave", "MyPassword", "login/java"); GSSContext ctx = client.handshake(); System.out.println("Server context established:" + ctx.isEstablished());

Trim: Removes whitespace from the start and end of a string TrimStart: Removes whitespace from the start of a string TrimEnd: Removes whitespace from the end of a string

client.close(); System.out.println("OK"); } }

To see how the XmlDataDocument class can be used, let s consider the following scenario: assume that you wish to develop a data-entry screen for the same Employees.xml file that we used earlier. The data-entry screen should be grid based and should allow the user to export the data as an HTML file. The HTML file can then be published in a web application. The preceding scenario calls for a DataSet to bind with the grid and it also calls for XSLT processing so that the data can be exported to HTML. In such cases, XmlDataDocument provides an effective solution. Let s see how. You need to develop a Windows application like the one shown in Figure 7-20.

Summary

Following through the main method of the client, things progress in a quite straightforward manner. First we establish a socket connection between the client and server machines. Although we make use of sockets, any medium that is capable of exchanging an array of bytes (bi-directionally) is able to use the GSS-API to establish a secure context, so Remote Method Invocation (RMI) could be used as easily. At a pinch, you could even establish the secure context by e-mail!

The application consists of a DataGridView control that displays the data from the Employees.xml file. You can modify the data and click the Export as HTML Page button to save the data as an HTML file. The Load event of the form is shown in Listing 7-22. Listing 7-22. Creating an XmlDataDocument from an XML File XmlDataDocument doc = null; private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\employees.xml"); doc = new XmlDataDocument(ds); dataGridView1.DataSource = ds.Tables[0]; } The code declares a class-level variable of type XmlDataDocument. The Load event of the form creates an instance of DataSet and reads the Employees.xml file into it by using ReadXml(). Then a new instance of XmlDataDocument is created by passing the DataSet we just created to its constructor. Thus our example constructs an XmlDataDocument by using a DataSet. The DataTable from the DataSet is then assigned as the DataSource of the DataGridView control. This way, the data from Employees.xml is available for editing. The Click event of the Export as HTML Page button is shown in Listing 7-23. Listing 7-23. Applying XSLT Transformations on XmlDataDocument private void button1_Click(object sender, EventArgs e) { XslCompiledTransform xslt = new XslCompiledTransform(); xslt.Load(Application.StartupPath + @"\employees.xslt"); XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\employees.html", null); xslt.Transform(doc, writer); writer.Close(); } The code creates an instance of the XslCompiledTransform class, and the XSLT style sheet is loaded by using its Load() method. Then an instance of XmlTextWriter is created to write the transformed data into an HTML file (Employees.html). The Transform() method of XslCompiledTransform is then called, and the XmlDataDocument and XmlTextWriter objects are passed to it as parameters. The Transform() method accesses the XML data from the XmlDataDocument class, applies the style sheet to it, and writes the transformed data by using XmlTextWriter.