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Decorator UML class diagram. The decorator pattern can be used to extend (decorate) the functionality of a certain object statically, or in some cases at run-time, independently of other instances of the same class, provided some groundwork is done at design time. This is achieved by designing a new Decorator class that wraps the original class ...
A sample UML class diagram for the adapter design pattern. [5] In the above UML class diagram, the client class that requires a target interface cannot reuse the adaptee class directly because its interface doesn't conform to the target interface. Instead, the client works through an adapter class that implements the target interface in terms ...
The more complex case is a Decorator Pattern that by using interfaces, forwarding can be made more flexible and typesafe. "Flexibility" here means that C need not refer to A or B in any way, as the switching of forwarding is abstracted from C. In this example, class C can forward to any class that implements an interface I.
Decorator pattern: add additional functionality to an object at runtime where subclassing would result in an exponential rise of new classes; Extensibility pattern: a.k.a. Framework - hide complex code behind a simple interface; Facade pattern: create a simplified interface of an existing interface to ease usage for common tasks
Composition over inheritance (or composite reuse principle) in object-oriented programming (OOP) is the principle that classes should favor polymorphic behavior and code reuse by their composition (by containing instances of other classes that implement the desired functionality) over inheritance from a base or parent class. [2]
A decorator is any callable Python object that is used to modify a function, method or class definition. A decorator is passed the original object being defined and returns a modified object, which is then bound to the name in the definition. Python decorators were inspired in part by Java annotations, and have a similar syntax; the decorator ...
This is analogous to subclasses deferring requests to parent classes. But with inheritance, an inherited operation can always refer to the receiving object through the this member variable in C++ and self in Smalltalk. To achieve the same effect with delegation, the receiver passes itself to the delegate to let the delegated operation refer to ...
The factory method design pattern solves problems such as: How can an object's subclasses redefine its subsequent and distinct implementation? The pattern involves creation of a factory method within the superclass that defers the object's creation to a subclass's factory method.