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| 1 | +/* |
| 2 | + * Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | + * |
| 5 | + * This code is free software; you can redistribute it and/or modify it |
| 6 | + * under the terms of the GNU General Public License version 2 only, as |
| 7 | + * published by the Free Software Foundation. |
| 8 | + * |
| 9 | + * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | + * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | + * accompanied this code). |
| 14 | + * |
| 15 | + * You should have received a copy of the GNU General Public License version |
| 16 | + * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | + * |
| 19 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | + * or visit www.oracle.com if you need additional information or have any |
| 21 | + * questions. |
| 22 | + */ |
| 23 | + |
| 24 | +import java.util.HashMap; |
| 25 | +import java.util.LinkedHashMap; |
| 26 | +import java.util.WeakHashMap; |
| 27 | + |
| 28 | +import org.junit.jupiter.api.Test; |
| 29 | + |
| 30 | +import static org.junit.jupiter.api.Assertions.assertFalse; |
| 31 | +import static org.junit.jupiter.api.Assertions.assertThrows; |
| 32 | +import static org.junit.jupiter.api.Assertions.assertTrue; |
| 33 | +import static org.junit.jupiter.api.Assertions.assertEquals; |
| 34 | + |
| 35 | +/* |
| 36 | + * @test |
| 37 | + * @summary Check WeakHashMap throws IdentityException when Value Objects are put |
| 38 | + * @enablePreview |
| 39 | + * @run junit WeakHashMapValues |
| 40 | + */ |
| 41 | +public class WeakHashMapValues { |
| 42 | + |
| 43 | + /* |
| 44 | + * Check that any kind of put with a value class as a key throws IdentityException |
| 45 | + */ |
| 46 | + @Test |
| 47 | + void checkThrowsIdentityException() { |
| 48 | + WeakHashMap<Object, Object> whm = new WeakHashMap<>(); |
| 49 | + Object key = new Foo(1); |
| 50 | + assertThrows(IdentityException.class, () -> whm.put(key, "1")); |
| 51 | + assertThrows(IdentityException.class, () -> whm.putIfAbsent(key, "2")); |
| 52 | + assertThrows(IdentityException.class, () -> whm.compute(key, (_, _) -> "3")); |
| 53 | + assertThrows(IdentityException.class, () -> whm.computeIfAbsent(key, (_) -> "4")); |
| 54 | + |
| 55 | + HashMap<Object, String> hmap = new HashMap<>(); |
| 56 | + hmap.put(key, "6"); |
| 57 | + assertThrows(IdentityException.class, () -> whm.putAll(hmap)); |
| 58 | + } |
| 59 | + |
| 60 | + /* |
| 61 | + * Check that any kind of put with Integer as a value class as a key throws IdentityException |
| 62 | + */ |
| 63 | + @Test |
| 64 | + void checkIntegerThrowsIdentityException() { |
| 65 | + WeakHashMap<Object, Object> whm = new WeakHashMap<>(); |
| 66 | + Object key = 1; |
| 67 | + assertThrows(IdentityException.class, () -> whm.put(key, "1")); |
| 68 | + assertThrows(IdentityException.class, () -> whm.putIfAbsent(key, "2")); |
| 69 | + assertThrows(IdentityException.class, () -> whm.compute(key, (_, _) -> "3")); |
| 70 | + assertThrows(IdentityException.class, () -> whm.computeIfAbsent(key, (_) -> "4")); |
| 71 | + |
| 72 | + HashMap<Object, String> hmap = new HashMap<>(); |
| 73 | + hmap.put(key, "6"); |
| 74 | + assertThrows(IdentityException.class, () -> whm.putAll(hmap)); |
| 75 | + |
| 76 | + } |
| 77 | + |
| 78 | + /** |
| 79 | + * Check that queries with a value object return false or null. |
| 80 | + */ |
| 81 | + @Test |
| 82 | + void checkValueObjectGet() { |
| 83 | + WeakHashMap<Object, Object> whm = new WeakHashMap<>(); |
| 84 | + Object key = "X"; |
| 85 | + Object v = new Foo(1); |
| 86 | + assertEquals(whm.get(v), null, "Get of value object should return null"); |
| 87 | + assertEquals(whm.containsKey(v), false, "containsKey should return false"); |
| 88 | + } |
| 89 | + |
| 90 | + /** |
| 91 | + * Check WeakHashMap.putAll from a source map containing a value object as a key throws. |
| 92 | + */ |
| 93 | + @Test |
| 94 | + void checkValueObjectPutAll() { |
| 95 | + // src is mix of identity and value objects (Integer is value class with --enable-preview) |
| 96 | + HashMap<Object, Object> srcMap = new LinkedHashMap<>(); |
| 97 | + srcMap.put("abc", "Vabc"); |
| 98 | + srcMap.put(1, "V1"); |
| 99 | + srcMap.put("xyz", "Vxyz"); |
| 100 | + WeakHashMap<Object, Object> whm = new WeakHashMap<>(); |
| 101 | + assertThrows(IdentityException.class, () -> whm.putAll(srcMap)); |
| 102 | + assertTrue(whm.containsKey("abc"), "Identity key should have been copied"); |
| 103 | + assertFalse(whm.containsKey(1), "Value object key should not have been copied"); |
| 104 | + assertEquals(1, whm.size(), "Result map size"); |
| 105 | + } |
| 106 | +} |
| 107 | + |
| 108 | +value class Foo { |
| 109 | + int x; |
| 110 | + Foo(int x) { |
| 111 | + this.x = x; |
| 112 | + } |
| 113 | +} |
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