Get all commits from repository, which have been commited before a given date

AllCommitsBeforeADate

 /**
     * Get all commits of a file which have been issued before a specified date
     * @param commitMap
     * @param execDate
     * @return
     */
        private TreeMap<DateTime,RevCommit> getAllCommitsBefore(Date execDate, String path){
        RevWalk walk = new RevWalk( this.repo );
        TreeMap<DateTime, RevCommit> commitsByDate = new TreeMap<DateTime, RevCommit>();
        try {
            walk.markStart( walk.parseCommit( this.repo.resolve( Constants.HEAD ) ) );
            walk.sort( RevSort.COMMIT_TIME_DESC);
            walk.setTreeFilter(PathFilter.create(path));
            for( RevCommit commit : walk ) {
                if ( commit.getCommitterIdent().getWhen().before(execDate) ) {
                    DateTime commitTime = new DateTime(commit.getCommitterIdent().getWhen());
                    commitsByDate.put(commitTime, commit);
                }
            }
            walk.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        if(commitsByDate.size()==0){
            Logger.error("No commits before specified date");
        }
        return commitsByDate;
    }