Composite pattern examples

This project contains small examples of Composite design pattern implemented in Java and Python.

Composite pattern

In software engineering, the composite pattern is a partitioning design pattern. The composite pattern describes a group of objects that are treated the same way as a single instance of the same type of object. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Implementing the composite pattern lets clients treat individual objects and compositions uniformly [1].

Fig. 1 - UML class design

Examples

• Example 1 in Java uses two objects, object File as Leaf, and object Directory as branch, and implements the composite pattern named CompositeDemo [3].
• Example 2 in Java uses three components, Project, Deliverable, and Task, forming a tree structure, where Projects and Tasks are branches, and Deliverables are Leafs. The output of the application lists the total amount of time needed, and details of all the items [3].
• Example 3 in Python composes objects into tree structures and then works with these structures as if they were individual objects [2].

Cite this work

J. Rico, (2019) Composite design pattern examples in Java and Python. 
[Source code](https://github.com/jvirico/CompositePattern)

References

[1] - Composite Pattern Wikipedia
[2] - SHVETS, Alexander. Dive Into Design Patterns. Refactoring. Guru, 2018.
[3] - PPCU, Budapest. Design Patterns