+
+ /*
+ * Have SUBTREE listeners
+ *
+ * This is slightly magical replacement for !Iterables.isEmpty(inheritedSub).
+ * It relies on the logic in child(), which gives us the guarantee that when
+ * inheritedSub is not a Collection, it is guaranteed to be non-empty (which
+ * means we need to process). If it is a collection, we still need to check
+ * it for emptiness.
+ *
+ * Unlike Iterables.isEmpty() this code does not instantiate any temporary
+ * objects and is thus more efficient.
+ */
+ if (inheritedSub instanceof Collection) {
+ return !((Collection<?>) inheritedSub).isEmpty();