@Override
        public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
          return myBuildRootIndex.isDirectoryAccepted(dir.toFile(), rootDescriptor)
                 ? FileVisitResult.CONTINUE
                 : FileVisitResult.SKIP_SUBTREE;
        }
@Override
        public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)