![]() Remember that (snippetslab://snippet/8F9987CE-7577-476C-8882-1F7712BE0B62/7BCB7847-572B-4466-8B19-B765CECA25DC/) makes two existing interfaces work together as opposed to defining an entirely new one.Diff line -44,19 +44,19 This pattern offers a proxy, or a substitute, to another complex object. As a consequence, Decorator supports recursive composition, which isn't possible with pure Adapters. Decorator is thus more transparent to the client. The client uses (is coupled to) the new interface The adapter/wrapper class "maps" the client interface to the adaptee interface. The adapter/wrapper class "has a" instance of the adaptee class. Design a "wrapper" class that can "impedance match" the adaptee to the client. Identify the interface that the client requires. the client), and the component that needs to adapt (i.e. Identify the players: the component(s) that want to be accommodated (i.e. You want to use an existing class, and it doesn't fit into your hierarchy JDK's offers many examples of the adapter pattern, for example Arrays.asList() / Collections.enumerate() / new InputStreamReader(new FileInputStream(*fileName*)) This is useful in cases where we want to take an existing class whose source code cannot be modified and make it work with another class, for example when working with legacy code or 3rd party libraries. It provides a different or translated view of that class. This strategy can be implemented either with inheritance or with aggregation.Īdapter functions as a wrapper or modifier of an existing class. Match interfaces of different classes and acts as an intermediary to convert an otherwise incompatible interface to one that a client expects.Ĭall methods on the Adapter object are redirected to the legacy component.
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