*/
@Override
protected ObjectId _call() {
final ProgressListener progress = getProgressListener();
TreeDifference treeDifference = computeTreeDifference();
if (treeDifference.areEqual()) {
MutableTree leftTree = treeDifference.getLeftTree();
Node leftNode = leftTree.getNode();
ObjectId leftOid = leftNode.getObjectId();
return leftOid;
}
final MutableTree oldLeftTree = treeDifference.getLeftTree().clone();
Preconditions.checkState(oldLeftTree.equals(treeDifference.getLeftTree()));
// handle renames before new and deleted trees for the computation of new and deleted to be
// accurate
Set<String> ignoreList = Sets.newHashSet();
handleRenames(treeDifference, ignoreList);
handlePureMetadataChanges(treeDifference, ignoreList);
handleNewTrees(treeDifference, ignoreList);
handleDeletedTrees(treeDifference, ignoreList);
handleRemainingDifferences(treeDifference, ignoreList);
progress.complete();
MutableTree newLeftTree = treeDifference.getLeftTree();
final ObjectDatabase repositoryDatabase = objectDatabase();
final RevTree newRoot = newLeftTree.build(stagingDatabase(), repositoryDatabase);
if (newRoot.trees().isPresent()) {
for (Node n : newRoot.trees().get()) {