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As per the role-based ACL shown in Table 1-3, a backup operator is allowed to read data from all user home directories (/home/*) so that the data can be archived. However, a principal with an administrator role, such as Alice, may be able to read, write, and execute files anywhere on the file system. Users that have multiple roles would declare their role just prior to conducting an action, such as doing a backup or modifying a file. While a user such as Bob may have both read and write privileges to some files (such as those in his home directory), the purpose of the role would be to ensure that he could not inadvertently modify a file while doing a backup. Another example might use the concept of a group in the UNIX operating system to implement RBAC. All users with a particular role would be placed in a group with the same name as their role (e.g., Alice and Bob would be members of the group programmer). To make the file /home/Alice/product_specs.txt available to all programmers, one could use the command chgrp programmer /home/Alice/product_specs.txt. As long as the file has group read privileges, all users within the programmer group will have read privileges for the file. The results of such a command are shown in Table 1-5, which contains a third row that specifies that any user with the programmer role can read the file /home/Alice/product_specs.txt. Table 1-5. The ACL Based on the RBAC Model

The ModelMetadataProvider class includes methods to get ModelMetadata for each member in the type ModelMetadata for a specific property, and ModelMetadata for a particular type, all of which can be seen in listing 15.4. To customize the display text for a particular property, we only need to override specific behavior of the existing DataAnnotationsModelMetadataProvider class. To assist in model metadata scenarios where the metadata is pulled from traditional classes, properties, and attributes, the AssociatedMetadataProvider class provides some common functionality. Derived classes, such as the DataAnnotationsModelMetadataProvider class, only need to build ModelMetadata from already-discovered attributes. In our case, we want to modify the behavior of the DisplayName model metadata. By default, the ModelMetadata s DisplayName property comes from the DisplayNameAttribute if supplied. We may still want to supply the DisplayName value through an attribute. In listing 15.5, we extend the built-in DataAnnotationsModelMetadataProvider to construct the DisplayName from the name of the property, split into separate words.

You can easily set the exact position of the resize bar with gtk_paned_set_position(). The position is calculated in pixels with respect to the top or left side of the container. If you set the position of the bar to zero, it will be moved all the way to the top or left if the widget allows shrinking. void gtk_paned_set_position (GtkPaned *paned, gint position); Most applications will want to remember the position of the resize bar, so it can be restored to the same location when the user next loads the application. The current position of the resize bar can be retrieved with gtk_paned_get_position(). gint gtk_paned_get_position (GtkPaned *paned); GtkPaned provides multiple signals, but one of the most useful is move-handle, which will tell you when the resizing bar has been moved. If you want to remember the position of the resize bar, this will tell you when you need to retrieve a new value. A full list of GtkPaned signals can be found in Appendix B.

public class ConventionProvider : DataAnnotationsModelMetadataProvider { protected override ModelMetadata CreateMetadata( IEnumerable<Attribute> attributes, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName) { var meta = base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);

Cookies are divided into two classes with respect to how long they are cached by the browser By default, a cookie is cached by the browser until the browser is shut down We refer to such cookies as temporary or non-persistent cookies4 Web servers have the option to annotate cookies sent to a browser with an explicit expiry date Such cookies persist until the indicated expiry time, even across restarts of the browser or reboots of the operating system, and are thus called persistent cookies In popular browser implementations, when the user opens an additional browser window or tab from within an already open browser, the new window reflects the same cookie state (ie, a request made to the same URL in either window would send the exact same set of cached cookies to the server).

So far, all of the layout container widgets I have covered only allow children to be packed in one dimension. The GtkTable widget, however, allows you to pack children in two-dimensional space. One advantage of using the GtkTable widget over using multiple GtkHBox and GtkVBox widgets is that children in adjacent rows and columns are automatically aligned with each other, which is not the case with boxes within boxes. However, this is also a disadvantage, because you will not always want everything to be lined up in this way. Figure 3-4 shows a simple table that contains three widgets. Notice that the single label spans two columns. This illustrates the fact that tables allow one widget to span multiple columns and/or rows as long as the region is rectangular.

if (meta.DisplayName == null) meta.DisplayName = meta.PropertyName.ToSeparatedWords(); return meta; } }