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The Composite pattern makes the client simple:
Clients use the Component class interface to interact with objects in the composite structure.
If call is made to a Leaf, the request is handled directly.
If call is to a Composite, it forwards the request to its child components.
Disadvantage:
Once tree structure is defined, the composite design makes the tree overly general.
In specific cases, it is difficult to restrict the components of the tree to only particular types.
Therefore, to enforce such constraint, the program must rely on run-time checks, since it cannot use the type system the of programming language.
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