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This scenario shows that when the user logs in or otherwise changes their access rights, the interface adjusts its appearance according to the current set of access rights. Later on when the user selects an operation, only valid operations can be accessed, so further checks are unnecessary and the operation is passed on directly to the system. See figure on page 315.

creates InterfaceBuilder log-in createVisibleUI check belong to Access Rights rights for user isPermitted(UIElement)

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To implement LIMITED ACCESS (312), several aspects need to be considered: 1. Implement the association of access rights with users. CHECK POINT (287) and SECURITY SESSION (297) are typical means of providing a user log-in and attaching their access rights. In the case of CHECK POINT (287) the interface can rely on the Check Point object to provide access to the set of enabled user interface elements. For further details about user identification and authentication, see 7, Identification and Authentication (I&A). For the modeling and management of access rights, see 8, Access Control Models. 2. Design the user interface and define the mapping of access rights to interface elements. The issues surrounding the design of a good (graphical) user interface are far beyond the scope of this pattern. However, you should model your individual access rights close to the available user interface elements, so that management and checking of access rights for your application is straightforward. If your application requires complex rules to decide whether an option is valid for a user, evaluating these rules every time the interface is (re-) drawn can be too costly, so you should either use FULL ACCESS WITH ERRORS (305) in that case, or cache the results of such an evaluation, for example within the user s SECURITY SESSION (297). The latter approach is viable as long the user s rights will not change during a session. A third way to optimize a LIMITED ACCESS (312) user interface is to provide an individual design for each role in ROLE-BASED ACCESS CONTROL (249). This works if your system only needs to support a few defined, stable and clearlydistinguished user roles. You can opt to design separate visual user interface

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layouts for each user role However, you should rely on common layouts for functionality that is available across the different roles Regardless of the approach chosen, the interface builder is the component to implement the mapping of access rights to the UI 3 Decide how to present and implement accessible versus inaccessible interface elements Most UI toolkits already provide the Boolean attributes enabled/ disabled or show/hide Either of these can be used to control the appearance of user interface elements that depend on the access rights of a user Hiding is more appropriate for data elements that a user should not access, whereas disabling is better for operational elements such as buttons, menus, or menu items If possible, you should refrain from creating your own visual appearance mechanism for enabling and disabling options, instead follow the mechanisms suggested by your GUI platform s guidelines, to avoid confusing your users.

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