*/
    @CheckReturnValue
    public VersionHierarchy updateVersion(VfsRelativePath relativePath, long newVersion, CaseSensitivity caseSensitivity) {
        ChildMap<VersionHierarchy> newChildren = children.store(relativePath, caseSensitivity, new ChildMap.StoreHandler<VersionHierarchy>() {
            @Override
            public VersionHierarchy handleAsDescendantOfChild(VfsRelativePath pathInChild, VersionHierarchy child) {

    private final CaseSensitivity caseSensitivity;
    private final VersionHierarchy rootNode;

    public static VersionHierarchyRoot empty(long version, CaseSensitivity caseSensitivity) {
        return new VersionHierarchyRoot(VersionHierarchy.empty(version), caseSensitivity);
    }

    private VersionHierarchyRoot(VersionHierarchy rootNode, CaseSensitivity caseSensitivity) {
        this.caseSensitivity = caseSensitivity;