How to use

command

method

in

org.locationtech.geogig.plumbing.DiffCount

/**
 * @return the tree referenced by the old ref, or the head of the index.
 */
private RevTree getTree(@Nullable String refSpec, @Nullable ObjectId treeId,
    @Nullable RevTree tree, ObjectStore source) {
  if (tree == null) {
    Optional<ObjectId> resolved = refSpec == null ? Optional.of(treeId)
        : command(ResolveTreeish.class).setTreeish(refSpec).call();
    if (resolved.isPresent()) {
      tree = source.getTree(resolved.get());
    } else {
      tree = RevTree.EMPTY;
    }
  }
  return tree;
}

/**
 * @return the tree referenced by the old ref, or the head of the index.
 */
private RevTree getTree(@Nullable String refSpec, @Nullable ObjectId treeId) {
  checkState(refSpec == null || treeId == null);
  final RevTree headTree;
  Optional<ObjectId> resolved = refSpec == null ? Optional.of(treeId)
      : command(ResolveTreeish.class).setTreeish(refSpec).call();
  if (resolved.isPresent()) {
    ObjectId headTreeId = resolved.get();
    headTree = objectDatabase().getTree(headTreeId);
  } else {
    headTree = RevTree.EMPTY;
  }
  return headTree;
}