dp-decorator-java's Introduction
A demonstration of the GOF Decorator design pattern. A discount is decorated depending on the discount type to be applied. The discount is decorated with the various applicable discounts at run time. Intent: Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality. Benefits: More flexible than static inheritance. Avoids function-laden classes high up the hierarchy. Limitations: A decorator and its components aren't identical. Lots of little objects. Applicability: - To add responsibilies to individual objects dynamically and transparantly, without afftecting other objects. - For responsibilities that can be withdrawn. - When extention by subclassing is impractical. Sometimes a large number of independent extentions are possible and would produce an explosion of subclasses to support every combination. Or a class definition may be hidden or otherwise unavailable for subclassing.
dp-decorator-java's People
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