Merge 6387e46 into ddb4f78

apache · Sep 7, 2021 · 73fa1f1 · 73fa1f1
2 parents ddb4f78 + 6387e46
commit 73fa1f1
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diff --git a/src/main/java/org/apache/commons/collections4/set/UnmodifiableNavigableSet.java b/src/main/java/org/apache/commons/collections4/set/UnmodifiableNavigableSet.java
@@ -107,6 +107,22 @@ public boolean removeAll(final Collection<?> coll) {
         throw new UnsupportedOperationException();
     }
 
+    /**
+     * @since 4.5
+     */
+    @Override
+    public E pollFirst() {
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * @since 4.5
+     */
+    @Override
+    public E pollLast() {
+        throw new UnsupportedOperationException();
+    }
+
     @Override
     public boolean retainAll(final Collection<?> coll) {
         throw new UnsupportedOperationException();

diff --git a/src/test/java/org/apache/commons/collections4/set/UnmodifiableNavigableSetTest.java b/src/test/java/org/apache/commons/collections4/set/UnmodifiableNavigableSetTest.java
@@ -143,6 +143,23 @@ public void verifyUnmodifiable(final Set<E> set) {
         } catch (final UnsupportedOperationException e) {
             // expected
         }
+
+        if (set instanceof NavigableSet) {
+            final NavigableSet<E> navigableSet = (NavigableSet<E>) set;
+
+            try {
+                navigableSet.pollFirst();
+                fail("Expecting UnsupportedOperationException.");
+            } catch (final UnsupportedOperationException e) {
+                // expected
+            }
+            try {
+                navigableSet.pollLast();
+                fail("Expecting UnsupportedOperationException.");
+            } catch (final UnsupportedOperationException e) {
+                // expected
+            }
+        }
     }
 
     public void testComparator() {