| /* |
| * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6323374 |
| * @run testng WrappedUnmodifiableCollections |
| */ |
| |
| import java.util.*; |
| import java.util.function.Function; |
| import org.testng.annotations.Test; |
| import static org.testng.Assert.*; |
| |
| |
| @Test |
| public class WrappedUnmodifiableCollections { |
| |
| private static <T,E extends T> void testWrapping(T collection, Function<T,E> wrapper) { |
| var collection1 = wrapper.apply(collection); |
| var collection2 = wrapper.apply(collection1); |
| assertNotSame(collection, collection2); |
| assertSame(collection1, collection2); |
| } |
| |
| public void testUnmodifiableListsDontWrap() { |
| List<List<?>> lists = List.of(List.of(), List.of(1,2,3), List.of(1), |
| List.of(1,2,3,4,5,6), |
| List.of(1,2,3).subList(0,1), |
| new LinkedList<>(List.of(1,2,3)), |
| new ArrayList<>(List.of(1,2,3))); |
| |
| for(List<?> list : lists) { |
| testWrapping(list, Collections::unmodifiableList); |
| } |
| } |
| |
| public void testUnmodifiableCollectionsDontWrap() { |
| Collection<?> list = List.of(); |
| testWrapping(list, Collections::unmodifiableCollection); |
| } |
| |
| public void testUnmodifiableSetsDontWrap() { |
| |
| List<Set<?>> sets = List.of(new TreeSet<>(), |
| Set.of(1, 2), |
| Set.of(1,2,3,4,5,6)); |
| |
| for (Set<?> set : sets) { |
| testWrapping(set, Collections::unmodifiableSet); |
| } |
| |
| TreeSet<?> treeSet = new TreeSet<>(); |
| |
| //Collections.UnmodifiableSortedSet |
| testWrapping((SortedSet<?>) treeSet, Collections::unmodifiableSortedSet); |
| |
| //Collections.UnmodifiableNavigableSet |
| testWrapping((NavigableSet<?>) treeSet, Collections::unmodifiableNavigableSet); |
| |
| } |
| |
| public void testUnmodifiableMapsDontWrap() { |
| TreeMap<?,?> treeMap = new TreeMap<>(); |
| |
| List<Map<?,?>> maps = List.of(treeMap, |
| Map.of(1,1), |
| Map.of(1, 1, 2, 2, 3, 3, 4, 4)); |
| |
| for (Map<?,?> map : maps) { |
| testWrapping(map, Collections::unmodifiableMap); |
| } |
| |
| //Collections.UnModifiableSortedMap |
| testWrapping((SortedMap<?,?>) treeMap, Collections::unmodifiableSortedMap); |
| |
| //Collections.UnModifiableNavigableMap |
| testWrapping((NavigableMap<?,?>) treeMap, Collections::unmodifiableNavigableMap); |
| |
| } |
| |
| } |