Question

2. The online bookstore system needs to display different messages and enable/disable different buttons in the main window according to different types of users. The class diagram below shows a way of handling the differences by applying the Polymorphism Pattern in the GRASP collection. (a) (20) As the Bridge Pattern in the GoF collection is able to decouple an abstraction from its imple- mentation for the two to vary independently, draw a class diagram to show the application of the Bridge Pattern for this given problem. (b) (6) Use C#/Java codes to explain how your classes based on the Bridge Pattern can be used to handle the differences of this given problem. Regular User MainWindow Attributes Operations Attributes Operations UserData + PrepareMessage() Attributes 1 1 Operations + PrepareMessage() + VisibleButton() + VisibleButton() UserOwner Attributes Operations + PrepareMessage() + VisibleButton()

          2. The online bookstore system needs to display different messages and enable/disable different buttons in
the main window according to different types of users. The class diagram below shows a way of handling
the differences by applying the Polymorphism Pattern in the GRASP collection.
(a) (20) As the Bridge Pattern in the GoF collection is able to decouple an abstraction from its imple-
mentation for the two to vary independently, draw a class diagram to show the application of the
Bridge Pattern for this given problem.
(b) (6) Use C#/Java codes to explain how your classes based on the Bridge Pattern can be used to
handle the differences of this given problem.
Regular User
MainWindow
Attributes
Operations
Attributes
Operations
UserData
+ PrepareMessage()
Attributes
1
1 Operations
+ PrepareMessage()
+ VisibleButton()
+ VisibleButton()
UserOwner
Attributes
Operations
+ PrepareMessage()
+ VisibleButton()

2. The online bookstore system needs to display different messages and enable/disable different buttons in
the main window according to different types of users. The class diagram below shows a way of handling
the differences by applying the Polymorphism Pattern in the GRASP collection.
(a) (20) As the Bridge Pattern in the GoF collection is able to decouple an abstraction from its imple-
mentation for the two to vary independently, draw a class diagram to show the application of the
Bridge Pattern for this given problem.
(b) (6) Use C#/Java codes to explain how your classes based on the Bridge Pattern can be used to
handle the differences of this given problem.
Regular User
MainWindow
Attributes
Operations
Attributes
Operations
UserData
+ PrepareMessage()
Attributes
1
1 Operations
+ PrepareMessage()
+ VisibleButton()
+ VisibleButton()
UserOwner
Attributes
Operations
+ PrepareMessage()
+ VisibleButton()

Added by Victoria M.

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