ObjectId newRootTree = currentIndexHead.getId();
for (Map.Entry<String, RevTreeBuilder> entry : parentTress.entrySet()) {
String changedTreePath = entry.getKey();
RevTreeBuilder changedTreeBuilder = entry.getValue();
RevTree changedTree = changedTreeBuilder.build();
ObjectId parentMetadataId = parentMetadataIds.get(changedTreePath);
if (NodeRef.ROOT.equals(changedTreePath)) {
// root
database.put(changedTree);
newRootTree = changedTree.getId();