The Decorator Design Pattern


The official definition of the Decorator pattern from the GoF book (Design Patterns: Elements of Reusable Object-Oriented Software, 1995, Pearson Education, Inc. Publishing as Pearson Addison Wesley) says you can, “Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.”

This pattern, also known as Wrapper, allows you to extend the core object by wrapping it in various decorator wrappers, avoiding modification of the core code. Each successive wrapper called the getDescription method of the object it wrapped and added something to it.

The decorator design pattern is also used in the classes. These classes are designed to be “chained” or “wrapped“. You can “wrap” a BufferedReader around a FileReader or a BufferedWriter around a FileWriter, to get access to higher-level (more convenient) methods.

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