dbef0ec95d
Reviewed-by: redestad, smarks, darcy
103 lines
3.4 KiB
Java
103 lines
3.4 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6323374
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* @run testng WrappedUnmodifiableCollections
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*/
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import java.util.*;
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import java.util.function.Function;
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import org.testng.annotations.Test;
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import static org.testng.Assert.*;
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@Test
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public class WrappedUnmodifiableCollections {
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private static <T,E extends T> void testWrapping(T collection, Function<T,E> wrapper) {
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var collection1 = wrapper.apply(collection);
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var collection2 = wrapper.apply(collection1);
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assertNotSame(collection, collection2);
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assertSame(collection1, collection2);
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}
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public void testUnmodifiableListsDontWrap() {
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List<List<?>> lists = List.of(List.of(), List.of(1,2,3), List.of(1),
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List.of(1,2,3,4,5,6),
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List.of(1,2,3).subList(0,1),
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new LinkedList<>(List.of(1,2,3)),
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new ArrayList<>(List.of(1,2,3)));
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for(List<?> list : lists) {
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testWrapping(list, Collections::unmodifiableList);
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}
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}
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public void testUnmodifiableCollectionsDontWrap() {
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Collection<?> list = List.of();
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testWrapping(list, Collections::unmodifiableCollection);
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}
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public void testUnmodifiableSetsDontWrap() {
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List<Set<?>> sets = List.of(new TreeSet<>(),
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Set.of(1, 2),
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Set.of(1,2,3,4,5,6));
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for (Set<?> set : sets) {
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testWrapping(set, Collections::unmodifiableSet);
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}
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TreeSet<?> treeSet = new TreeSet<>();
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//Collections.UnmodifiableSortedSet
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testWrapping((SortedSet<?>) treeSet, Collections::unmodifiableSortedSet);
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//Collections.UnmodifiableNavigableSet
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testWrapping((NavigableSet<?>) treeSet, Collections::unmodifiableNavigableSet);
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}
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public void testUnmodifiableMapsDontWrap() {
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TreeMap<?,?> treeMap = new TreeMap<>();
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List<Map<?,?>> maps = List.of(treeMap,
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Map.of(1,1),
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Map.of(1, 1, 2, 2, 3, 3, 4, 4));
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for (Map<?,?> map : maps) {
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testWrapping(map, Collections::unmodifiableMap);
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}
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//Collections.UnModifiableSortedMap
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testWrapping((SortedMap<?,?>) treeMap, Collections::unmodifiableSortedMap);
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//Collections.UnModifiableNavigableMap
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testWrapping((NavigableMap<?,?>) treeMap, Collections::unmodifiableNavigableMap);
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}
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}
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