The Visitor design pattern is a GOF (Gang of Four) pattern and can be used to define a new operation on your class sans the need of changing the existing code.

Following is the structure and collaboration diagrams of the Pipeline to Visitor pattern, in case the presentation framework being used supports us with the actual parameters of some specific use case ...

Several design patterns are defined to make systems more flexible and extensible. The main goal of this work is to show how the representation of these kind of patterns, which we refer to as ...