Readme.md

Introduction

The Decorator Design Pattern is class of Structural and having subclass of Object Structural. It helps to add additional functionality to object on the run-time.

Intent

• Attaching Additional Responsibilities to an Object Dynamically.
• An Alternate to Subclasses for extending Functionalities.

Motivation

Sometimes we need to add some additional functionality at runtime, so it requires the implementation of Decorator Design Pattern. Let's say that we have a Text Viewer and we want to add a Border, Horizontal and Vertical Scroll. So, these cannot be added directly to the Text Viewer Object, this is a solid example of application of the Decorator Design Pattern.

Also Known As

Wrapper

Structure

Applicability

Use Decorator Design Pattern when:

1. Adding responsibilities to object transparently and dynamically without affecting other objects.
2. For responsibilities that can be withdrawn.
3. When extension of class is not possible.

Consequences

• More flexible than static inheritance.
• Avoids feature-laden classes high-up in Hierarchy.
• A Decorator and its components are not identical.