The Composite Pattern
The key concept of the Composite Pattern is to enable us to treat a collection of objects in the same way as we treat a single object instance. Manipulating a composition by using a method on the collection will result in applying the manipulation to each part of it. Such methods can be applied successfully, regardless of the number of elements that are part of the composite collection, or even when the collection contains no elements.
Also, the objects of a composite collection do not necessarily have to provide the exact same methods. The Composite Object can either expose only the methods that are common among the objects of the collection, or can provide an abstracted API and appropriately handle the method differentiations ...
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