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expression trees of the Query<T> instances. We will now go over the code of the three classes, Query<T>, QueryProvider<T>, and QueryExpressionVisitor<T>. You will see as an example a typical use of DLR Expression as a metaprogramming technique. Listing 8-14 shows the Query<T> class. To be a class that represents LINQ queries, Query<T> must implement the IQueryable<T> interface. Of the property accessors and interface methods we must implement in order to implement the IQueryable<T> interface, the two most important ones are the Expression property get accessor and the Provider property get accessor. As mentioned previously, the Query<T> class represents queries as DLR expression trees. The Expression property is the evidence of that. The property holds a DLR expression that can have child expressions. Those child expressions can have child expressions, and so on. All together, the expressions form an expression tree that represents a query. As to the Provider property, it s there in Query<T> to decouple queries from the actual data store. It is the link between queries and the actual store. Listing 8-14. The Query<T> Class public class Query<T> : IQueryable<T> { private IQueryProvider provider; private Expression expression; public Query(IQueryProvider provider) { this.provider = provider; this.expression = Expression.Constant(this); } public Query(IQueryProvider provider, Expression expression) { if (!typeof(IQueryable<T>).IsAssignableFrom(expression.Type)) throw new ArgumentException("expression"); this.provider = provider; this.expression = expression; } Expression IQueryable.Expression { get { return expression; } } Type IQueryable.ElementType { get { return typeof(T); } } IQueryProvider IQueryable.Provider { get { return provider; } } public IEnumerator<T> GetEnumerator()

/** * Form validation handler for the current password on the user_account_form(). * * @see user_account_form() */ function legalagree_user_form_validate($form, &$form_state) { global $user; // Did user agree if ($form_state['input']['decision'] <> 1) { form_set_error('decision', t('You must agree to the Legal Agreement before registration can be completed.')); } else { watchdog('user', t('User %user agreed to legal terms', array('%user' => $user->name))); } } The user hook gets called during the creation of the registration form, during the validation of that form, and after the user record has been inserted into the database. Our brief module will result in a registration form similar to the one shown in Figure 6-2.

As we mentioned in the introductory section of this chapter, you can use BitLocker on a computer that does not have a TPM chip in it. The main differences in BitLocker s operation in this scenario are as follows:

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If you plan to extend the user registration form to collect information about users, you would do well to try out profile.module before writing your own module. It allows you to create arbitrary forms to collect data, define whether the information is required and/or collected on the user registration form, and designate whether the information is public or private. Additionally, it allows the administrator to define pages so that users can be viewed by their profile choices using a URL constructed from site URL plus profile/ plus name of profile field plus value. For example, if you define a textual profile field named profile_color, you could view all the users who chose black for their favorite color at http://example.com/ q=profile/profile_color/black. Or suppose you are creating a conference web site and are responsible for planning dinner for attendees. You could define a check box profile field named profile_vegetarian and view all users who are vegetarians at http://example.com/ q=profile/profile_vegetarian (note that for check box fields, the value is implicit and thus ignored; that is, there is no value appended to the URL like the value black was for the profile_color field). As a real-world example, the list of users at http://drupal.org who attended the 2010 Drupal conference in San Francisco, California, can be viewed at profile/conference-sf-2010 (in this case, the name of the field is not prefixed with profile_).

You will need to have the USB start-up key inserted into the computer whenever it boots. You will not be able to boot the computer without getting prompted for the key; thus, this is best for individual computers and not necessarily machines that have multiple users. To use BitLocker with a start-up key, follow these steps: 1. Open the Control Panel. 2. Click Security, and then click BitLocker Drive Encryption. You may need to acknowledge the User Account Control prompt. 3. The BitLocker Drive Encryption screen appears. Click Turn on BitLocker. 4. The Use a Startup Key or PIN for Added Security screen appears. Choose the Save a Startup Key on a USB drive. If you do not choose this, you cannot run BitLocker. 5. On the next screen, choose the location of your USB drive, and then click Save. 6. The Create Recovery Password screen appears; click the button to do so. 7. The Save the Recovery Password screen appears. You can choose from saving the password to a USB drive, saving it to a folder, showing the password on the screen so you can write it down, or printing the password to any configured printer. You can select more than one of these choices by clicking the Back button after completing the screens for that option. Next, you ll be presented some information about disk encryption. 8. The Encrypt the Selected Disk Volume screen appears; here, click the Encrypt button. The status bar appears, and encryption commences. You can expect the process to take about one minute per gigabyte of stored data.

{ return ((IEnumerable<T>)provider.Execute(expression)).GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return ((IEnumerable)provider.Execute(expression)).GetEnumerator(); } }

Tip Automatic creation of profile summary pages works only if the field Page title is filled out in the profile field settings and is not available for textarea, URL, or date fields.

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