abstract class MessageBuilderHelper {

    static Collection<String> pathTo(EdgeState edge) {
        return pathTo(edge, true);
    }

    static Collection<String> pathTo(EdgeState edge, boolean includeLast) {
        List<List<EdgeState>> acc = Lists.newArrayListWithExpectedSize(1);
        pathTo(edge, new ArrayList<>(), acc, new HashSet<>());
        List<String> result = Lists.newArrayListWithCapacity(acc.size());