less garbage: no new instance on empty collection

2026-09-27 10:03:11 +07:00 · 2017-01-31 23:59:45 +03:00
parent 3ac9182eab
commit 52d43793bc
1 changed files with 1 additions and 0 deletions
@@ -87,6 +87,7 @@ public abstract class JBIterable<E> implements Iterable<E> {
  public static <E> JBIterable<E> from(@Nullable Iterable<? extends E> iterable) {
    if (iterable == null) return empty();
    if (iterable instanceof JBIterable) return (JBIterable<E>)iterable;
+    if (iterable instanceof Collection && ((Collection)iterable).isEmpty()) return empty();
    return new JBIterable<E>((Iterable<E>)iterable) {
      @Override
      public Iterator<E> iterator() {