Looping over commits for a file with jGit

Question

I\'ve managed to get to grips with the basics of jGit file in terms of connecting to a repos and adding, commiting, and even looping of the commit messages for the files.

Answer 1

araqnid is right, this is how I got a list of Dates, each date relating to commit that included the file in question...

Then you can retrieve the file from a specific commit as you have the name of the file and the date of the commit, see the two methods below....

note: this code is in a .groovy class, so you will no doubt have to amend a little for java.

byte[] getAnyPreviousVersionFileBytes(String relativeFilePath, Date date) {

    byte[] bytes = null
    try {

        RevWalk revWalk = new RevWalk(repository)
        ObjectId headId = repository.resolve(Constants.HEAD);
        RevCommit root = revWalk.parseCommit(headId);

        revWalk.sort(RevSort.COMMIT_TIME_DESC);
        revWalk.markStart(root);

        for (RevCommit revCommit: revWalk) {

            // if date matches then walk the tree in this commit
            if (new Date(revCommit.commitTime * 1000L) == date) {

                TreeWalk treeWalk = TreeWalk.forPath(repository, relativeFilePath, revCommit.getTree())

                if (treeWalk != null) {
                    treeWalk.setRecursive(true)
                    CanonicalTreeParser canonicalTreeParser = treeWalk.getTree(0, CanonicalTreeParser)

                    while (!canonicalTreeParser.eof()) {

                        // if the filename matches, we have a match, so set teh byte array to return
                        if (canonicalTreeParser.getEntryPathString() == relativeFilePath) {
                            ObjectLoader objectLoader = repository.open(canonicalTreeParser.getEntryObjectId())
                            bytes = objectLoader.bytes
                        }
                        canonicalTreeParser.next(1)
                    }
                }
            }

        }

    }
    catch (Exception e) {
        throw new JgitException(e)
    }
    return bytes
}

List getFileVersionDateList(String relativeFilePath) {

    List versions = new LinkedList()
    try {

        RevWalk revWalk = new RevWalk(repository)
        ObjectId headId = repository.resolve(Constants.HEAD);
        RevCommit root = revWalk.parseCommit(headId);

        revWalk.sort(RevSort.COMMIT_TIME_DESC);
        revWalk.markStart(root);

        for (RevCommit revCommit: revWalk) {

            TreeWalk treeWalk = TreeWalk.forPath(repository, relativeFilePath, revCommit.getTree())

            if (treeWalk != null) {
                treeWalk.setRecursive(true)
                CanonicalTreeParser canonicalTreeParser = treeWalk.getTree(0, CanonicalTreeParser)

                while (!canonicalTreeParser.eof()) {
                    // if the filename matches, we have a match, so add the date of this commit to the list
                    if (canonicalTreeParser.getEntryPathString() == relativeFilePath) {
                        versions.add(new Date(revCommit.commitTime * 1000L))
                    }
                    canonicalTreeParser.next(1)
                }
            }
        }
    }
    catch (Exception e) {
        throw new JgitException(e)
    }

    return versions
}