JGit: How to get all commits of a branch? (Without changes to the working directory …)

Question

how do I get all commits of a branch with JGit, without changing the working directory?

Unfortunately the JGit docs are not very good ...

In ruby with grit i

Answer 1

With the code below you can get all commits of a branch or tag:

Repository repository = new FileRepository("/path/to/repository/.git");
String treeName = "refs/heads/master"; // tag or branch
for (RevCommit commit : git.log().add(repository.resolve(treeName)).call()) {
    System.out.println(commit.getName());
}

The varialbe treeName will define the tag or branch. This treeName is the complete name of the branch or tag, for example refs/heads/master for the master branch or refs/tags/v1.0 for a tag called v1.0.

Alternatively, you can use the gitective API. The following code does the same as the code above:

Repository repository = new FileRepository("/path/to/repository/.git");

AndCommitFilter filters = new AndCommitFilter();
CommitListFilter revCommits = new CommitListFilter();
filters.add(revCommits);

CommitFinder finder = new CommitFinder(repository);
finder.setFilter(filters);
String treeName = "refs/heads/master"; // tag or branch
finder.findFrom(treeName);

for (RevCommit commit : revCommits) {
    System.out.println(commit.getName());
}

Some try/catch will be necessary, I hide them to make the code shorter. Good luck.