It lets you build tree-like structures where both leaves (single objects) and branches (composite groups) can be interacted with using the same interface
aka Object Tree.
The Composite Pattern is a structural design pattern that allows you to treat individual objects and groups of objects (composites) the same way.
Analogy
A folder system on your computer:
- A folder can contain files or other folders.
- You can perform actions like
delete,rename, ormoveon both files and folders. - Whether you’re dealing with one file or a whole folder of items, you treat them the same.
When to Use
- You need to represent hierarchies of objects (like trees or folders).
- You want uniform treatment for individual and composite objects.
- You want to simplify client code by hiding the difference between single and group operations.