Structural Design• Patterns: Composite

File System

Medium

Problem Summary

Design an in-memory Directory and File management system that processes nesting structures and size computations.

Functional Scope

Directories can contain files or other nested directories.
Calculate directory sizes dynamically (sum of all nested contents).
Support standard actions like list, delete, and search.

Entity-Relationship (ER) Schema

Directory [1] <---> [*] FileSystemEntry
FileSystemEntry <|-- File
FileSystemEntry <|-- Directory

Design Approach

Implement the Composite design pattern. Ensure directories and files inherit from the same base class to process sizes and listing routines uniformly.

Core Classes & Models

FileSystemEntry (Base abstract component)File (Leaf component)Directory (Composite component containing children)

Code Blueprint

public abstract class FileSystemEntry {
    protected String name;
    public abstract int getSize();
}