}

        private Map<T, String> getNewNames() {
            if (!elements.isEmpty() && newNames.isEmpty()) {
                calculateNewNames();
            }

            return ImmutableMap.copyOf(newNames);
        }

        private void calculateNewNames() {
            sortElementsByDepth();
            for (T element : elements) {
                elementsByName.put(getOriginalName(element), element);