final List<FeatureTypeStats> stats = Lists.newArrayList();
LogOp logOp = geogig.command(LogOp.class).setFirstParentOnly(true);
final Iterator<RevCommit> log;
if (since != null && !since.trim().isEmpty()) {
Date untilTime = new Date();
Date sinceTime = new Date(geogig.command(ParseTimestamp.class).setString(since).call());
logOp.setTimeRange(new Range<Date>(Date.class, sinceTime, untilTime));
}
if (this.until != null) {
Optional<ObjectId> until;
until = geogig.command(RevParse.class).setRefSpec(this.until).call();