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The GSSContextUtil class provides a pair of messages for creating the GSSContext objects that we require to carry out the authentication, and a PrivilegedAction class that allows us to do the necessary setup while running with the privileges of the Subject that we retrieve from JAAS. To carry out the privileged action for the client, we invoke createOutgoingGSSContext(). The meat of this method is the following call:

GSSContext context = (GSSContext) Subject.doAs( subject, new CreateGSSContextPrivilegedAction( credentialPrincipal, contextPrincipal, GSSCredential.INITIATE_ONLY));

You can format a number using the format function. This uses a culture-independent value, based on the en-US culture. For example, if you want to format a number as a currency (c format), you can use the following:

While discussing DataSet and DataAdapter, we developed an application that allowed us to perform inserts, updates, and deletes on a DataSet and then save those changes back to the database (see Figure 7-6). In that application, we frequently used collections such as Tables and Rows. We also needed to remember column names while accessing their values from a DataRow. Don t you think it is a bit tedious to access data in this fashion To make things clearer, have a look at Listings 7-17 and 7-18.

public static Object doAs(Subject subject, PrivilegedExceptionAction action) throws PrivilegedActionException

var a = 20; var v = a.format("c");

Listing 7-17. Inserting a DataRow by Using an Untyped DataSet private void button2_Click(object sender, EventArgs e) { DataRow row = ds.Tables["Employees"].NewRow(); row["employeeid"] = comboBox1.Text; row["firstname"] = textBox1.Text; row["lastname"] = textBox2.Text; row["homephone"] = textBox3.Text; row["notes"] = textBox4.Text; ds.Tables["Employees"].Rows.Add(row); FillEmployees(); } Listing 7-18. Inserting a DataRow by Using a Typed DataSet private void button2_Click(object sender, EventArgs e) { EmployeesDataSet.EmployeesRow row = ds.Employees.NewEmployeesRow(); row.EmployeeID = int.Parse(comboBox1.Text); row.FirstName = textBox1.Text; row.LastName = textBox2.Text; row.HomePhone = textBox3.Text; row.Notes = textBox4.Text; ds.Employees.AddEmployeesRow(row); FillEmployees(); } Both of these listings represent code that inserts a new DataRow into a DataTable. Compare the listings carefully. In Listing 7-17, we access the Employees DataTable and its columns by specifying them in double quotes. That means you need to remember these names when you are coding. However, Listing 7-18 looks different. You will notice that it uses the Employees property to create a new row. Further, it uses column names such as FirstName and LastName as if they are properties. Obviously, the second version is far easier to code and is much neater, which demonstrates what typed DataSets are about. A typed DataSet is nothing but a class that internally derives from DataSet as a base class. It extends this base class further and adds certain properties and methods that make the developer s life easy. When using a typed DataSet, you can access DataTable and DataColumn objects by using strongly typed names instead of the collection syntax. A typed DataSet has an XSD schema attached to it that defines the DataTable and DataColumn objects of the DataSet.

8

to assume the privileges of the logged-in subject. The action that should be carried out is defined by the run() method of an instance of CreateGSSContextPrivilegedAction. We provide this method with the name of the principal associated with the subject, the name of the principal of the context that we would like to establish (effectively the principal that we want to connect to), and the direction in which the operation will take place in this case, the client is initiating the connection. The run() method of the privileged action then carries out a number of tasks in its privileged state:

To use the current culture to format the number, you can use the localeFormat function. This formats the number based on the current system locale. To understand how to configure this, you should check out the ASP.NET documentation on globalization and localization. The script to format the number according to the current culture is identical:

Now that you know what a typed DataSet is, let s create one for our Employees table. To do so, you first need to add a typed DataSet to your project. Figure 7-16 shows the Add New Item dialog box of Visual Studio, through which you can add a new typed DataSet.

We acquire a GSSManager object, which we will use to obtain other GSS objects to carry out the authentication:

var a = 20; var v = a.localeFormat("c");

GSSManager manager = GSSManager.getInstance();