Start by clarifying the requirements and assumptions, then outline the algorithm: use JGit to resolve the two branch refs, compute the diff between their commit trees, extract changed file paths, and aggregate counts per owner using the CSV mapping. Finally, discuss trade-offs like performance, edge cases, and how this fits into a larger automated reviewer assignment system.
Pro tip: Mention that you would cache the file-to-owner mapping and use a streaming CSV parser for large repositories, and that you would handle renames and binary files explicitly to avoid incorrect owner attribution.
Ask about the repository size, branch comparison semantics (e.g., merge-base vs. direct diff), and the CSV format. Confirm whether to consider only added/modified files or also deleted files.
Use JGit's Repository and Git classes to open the repo and resolve the two branch names to ObjectId (commit SHA). Handle exceptions like missing branches.
Use DiffCommand or TreeWalk to compute the diff between the two commits. Collect the list of changed file paths, handling renames and binary files appropriately.
Load the CSV mapping (file path -> owner) into a map. For each changed file, look up the owner and increment a counter. Use a HashMap<String, Integer> for counts.
Find the owner with the maximum count. Discuss how this could be integrated into a CI/CD pipeline or webhook to automatically assign reviewers, and mention scalability considerations.
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