public final FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
            collector.recordVisitDirectory();
            return doPreVisitDirectory(dir, attrs);
        }

        protected abstract FileVisitResult doPreVisitDirectory(Path dir, BasicFileAttributes attrs);

        @Override
        public final FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {

                unfilteredSnapshotRecorder.accept(snapshot);
            }
        }

        @Override
        protected FileVisitResult doPreVisitDirectory(Path dir, BasicFileAttributes attrs) {
            String fileName = getInternedFileName(dir);
            pathTracker.enter(fileName);
            if (shouldVisitDirectory(dir, fileName)) {