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Design patterns

Display platform changing

Problem wording :

Design a system for changing the style of windows on the screen. Three types of window are possible: simple, with menu and transparent. The style of these windows depends on the platform of use. Two platforms are considered, Gnome and XFCE. The client code must be able to be written independently and without prior knowledge of the future execution platform.

Optimal solution :

Static diagram :

Static diagram

In this solution, there is a real separation between the windows style and their content. It is possible to add a new style or a new type without modifying existing code.

Alternative solution 1 :

Static diagram :

Static diagram

This solution has no extensibility and a lot of ConcreteImplementor

Click here to see the spoiled pattern deduced from this alternative solution

Alternative solution 2 :

Static diagram :

Static diagram

Probably the worst case with Implementor under Refined Abstraction

Click here to see the spoiled pattern deduced from this alternative solution

Alternative solution 3 :

Static diagram :

Static diagram

Probably the worst case with Abstraction under Concrete Implementor

Click here to see the spoiled pattern deduced from this alternative solution

Les têtes de mule
Cédric BOUHOURS
Cédric BOUHOURS
Cédric BOUHOURS