builder.setParentIds(Lists.newArrayList(filteredParents));
builder.setTreeId(endTree);
if (message == null) {
message = since.getMessage();
}
long timestamp = platform.currentTimeMillis();
builder.setMessage(message);
builder.setCommitter(resolveCommitter());
builder.setCommitterEmail(resolveCommitterEmail());
builder.setCommitterTimestamp(timestamp);
builder.setCommitterTimeZoneOffset(platform.timeZoneOffset(timestamp));