ibessonov commented on a change in pull request #402:
URL: https://github.com/apache/ignite-3/pull/402#discussion_r731788730
##########
File path:
modules/core/src/main/java/org/apache/ignite/internal/util/CollectionUtils.java
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@@ -193,6 +198,45 @@ else if (mapper == null)
}
}
+ /**
+ * Converts iterator to stream.
+ *
+ * @param iterator Iterator.
+ * @param <T> Type of elements in iterator.
+ * @return Stream.
+ */
+ public static <T> Stream<T> iteratorToStream(Iterator<T> iterator) {
+ return stream(spliteratorUnknownSize(iterator, Spliterator.ORDERED),
false);
+ }
+
+ /**
+ * Returns iterator that iterates list in reverse order.
+ *
+ * @param list List.
+ * @param <T> Type of elements in list.
+ * @return Reverse iterator.
+ */
+ public static <T> Iterator<T> reverseIterator(List<? extends T> list) {
+ return new Iterator<T>() {
+ private final ListIterator<? extends T> iter =
list.listIterator(list.size());
+
+ /** {@inheritDoc} */
+ @Override public boolean hasNext() {
+ return iter.hasPrevious();
+ }
+
+ /** {@inheritDoc} */
+ @Override public T next() {
+ return iter.previous();
+ }
+
+ /** {@inheritDoc} */
+ @Override public void remove() {
+ iter.remove();
Review comment:
As far as I know, methods contract doesn't specify what to do in this
case
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