# This way the client code can support both simple components. The Decorator delegates all work to the wrapped component.Ĭoncrete Decorators call the wrapped object and alter its result in someĭecorators may call parent implementation of the operation, instead ofĬalling the wrapped object directly. This takes place at compile-time, and all the instances of that class get the extended behavior. We use inheritance to extend the behavior of the class. Self._component = component(self) -> Component: Decorator design pattern allows us to dynamically add functionality and behavior to an object without affecting the behavior of other existing objects within the same class. Might include a field for storing a wrapped component and the means toĭef _init_(self, component: Component) -> None: The default implementation of the wrapping code The primary purpose of this class is to define the wrapping interface forĪll concrete decorators. The base Decorator class follows the same interface as the other components. Might be several variations of these classes. The base Component interface defines operations that can be altered byĬoncrete Components provide default implementations of the operations. Main.py: Conceptual example class Component(): In what way the elements of the pattern are related?.This example illustrates the structure of the Decorator design pattern. Identification: Decorator can be recognized by creation methods or constructors that accept objects of the same class or interface as a current class. Usage examples: The Decorator is pretty standard in Python code, especially in code related to streams.
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