1051 lines
44 KiB
Java
1051 lines
44 KiB
Java
/*
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* Copyright (c) 2013, 2017, 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 8010122 8004518 8024331 8024688
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* @summary Test Map default methods
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* @author Mike Duigou
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* @run testng Defaults
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*/
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import org.testng.Assert.ThrowingRunnable;
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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import java.util.AbstractMap;
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import java.util.AbstractSet;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.EnumMap;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Hashtable;
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import java.util.IdentityHashMap;
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import java.util.Iterator;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeMap;
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import java.util.WeakHashMap;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.ConcurrentSkipListMap;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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import java.util.function.Supplier;
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import static java.util.Objects.requireNonNull;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertFalse;
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import static org.testng.Assert.assertNull;
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import static org.testng.Assert.assertSame;
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import static org.testng.Assert.assertThrows;
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import static org.testng.Assert.assertTrue;
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import static org.testng.Assert.fail;
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public class Defaults {
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@Test(dataProvider = "Map<IntegerEnum,String> rw=all keys=withNull values=withNull")
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public void testGetOrDefaultNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), description + ": null key absent");
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assertNull(map.get(null), description + ": value not null");
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assertSame(map.get(null), map.getOrDefault(null, EXTRA_VALUE), description + ": values should match");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=all keys=all values=all")
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public void testGetOrDefault(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(KEYS[1]), "expected key missing");
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assertSame(map.get(KEYS[1]), map.getOrDefault(KEYS[1], EXTRA_VALUE), "values should match");
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assertFalse(map.containsKey(EXTRA_KEY), "expected absent key");
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assertSame(map.getOrDefault(EXTRA_KEY, EXTRA_VALUE), EXTRA_VALUE, "value not returned as default");
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assertNull(map.getOrDefault(EXTRA_KEY, null), "null not returned as default");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testPutIfAbsentNulls(String description, Map<IntegerEnum, String> map) {
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// null -> null
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertNull(map.putIfAbsent(null, EXTRA_VALUE), "previous not null");
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// null -> EXTRA_VALUE
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assertTrue(map.containsKey(null), "null key absent");
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assertSame(map.get(null), EXTRA_VALUE, "unexpected value");
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assertSame(map.putIfAbsent(null, null), EXTRA_VALUE, "previous not expected value");
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assertTrue(map.containsKey(null), "null key absent");
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assertSame(map.get(null), EXTRA_VALUE, "unexpected value");
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assertSame(map.remove(null), EXTRA_VALUE, "removed unexpected value");
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// null -> <absent>
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assertFalse(map.containsKey(null), description + ": key present after remove");
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assertNull(map.putIfAbsent(null, null), "previous not null");
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// null -> null
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertNull(map.putIfAbsent(null, EXTRA_VALUE), "previous not null");
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assertSame(map.get(null), EXTRA_VALUE, "value not expected");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testPutIfAbsent(String description, Map<IntegerEnum, String> map) {
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// 1 -> 1
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assertTrue(map.containsKey(KEYS[1]));
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Object expected = map.get(KEYS[1]);
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assertTrue(null == expected || expected == VALUES[1]);
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assertSame(map.putIfAbsent(KEYS[1], EXTRA_VALUE), expected);
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assertSame(map.get(KEYS[1]), expected);
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// EXTRA_KEY -> <absent>
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assertFalse(map.containsKey(EXTRA_KEY));
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assertSame(map.putIfAbsent(EXTRA_KEY, EXTRA_VALUE), null);
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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assertSame(map.putIfAbsent(EXTRA_KEY, VALUES[2]), EXTRA_VALUE);
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=all keys=all values=all")
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public void testForEach(String description, Map<IntegerEnum, String> map) {
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IntegerEnum[] EACH_KEY = new IntegerEnum[map.size()];
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map.forEach((k, v) -> {
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int idx = (null == k) ? 0 : k.ordinal(); // substitute for index.
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assertNull(EACH_KEY[idx]);
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EACH_KEY[idx] = (idx == 0) ? KEYS[0] : k; // substitute for comparison.
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assertSame(v, map.get(k));
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});
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assertEquals(KEYS, EACH_KEY, description);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public static void testReplaceAll(String description, Map<IntegerEnum, String> map) {
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IntegerEnum[] EACH_KEY = new IntegerEnum[map.size()];
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Set<String> EACH_REPLACE = new HashSet<>(map.size());
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map.replaceAll((k,v) -> {
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int idx = (null == k) ? 0 : k.ordinal(); // substitute for index.
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assertNull(EACH_KEY[idx]);
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EACH_KEY[idx] = (idx == 0) ? KEYS[0] : k; // substitute for comparison.
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assertSame(v, map.get(k));
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String replacement = v + " replaced";
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EACH_REPLACE.add(replacement);
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return replacement;
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});
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assertEquals(KEYS, EACH_KEY, description);
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assertEquals(map.values().size(), EACH_REPLACE.size(), description + EACH_REPLACE);
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assertTrue(EACH_REPLACE.containsAll(map.values()), description + " : " + EACH_REPLACE + " != " + map.values());
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assertTrue(map.values().containsAll(EACH_REPLACE), description + " : " + EACH_REPLACE + " != " + map.values());
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=nonNull values=nonNull")
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public static void testReplaceAllNoNullReplacement(String description, Map<IntegerEnum, String> map) {
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assertThrowsNPE(() -> map.replaceAll(null));
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assertThrowsNPE(() -> map.replaceAll((k,v) -> null)); //should not allow replacement with null value
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public static void testRemoveNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertFalse(map.remove(null, EXTRA_VALUE), description);
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assertTrue(map.containsKey(null));
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assertNull(map.get(null));
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assertTrue(map.remove(null, null));
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assertFalse(map.containsKey(null));
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assertNull(map.get(null));
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assertFalse(map.remove(null, null));
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public static void testRemove(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(KEYS[1]));
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Object expected = map.get(KEYS[1]);
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assertTrue(null == expected || expected == VALUES[1]);
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assertFalse(map.remove(KEYS[1], EXTRA_VALUE), description);
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assertSame(map.get(KEYS[1]), expected);
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assertTrue(map.remove(KEYS[1], expected));
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assertNull(map.get(KEYS[1]));
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assertFalse(map.remove(KEYS[1], expected));
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assertFalse(map.containsKey(EXTRA_KEY));
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assertFalse(map.remove(EXTRA_KEY, EXTRA_VALUE));
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testReplaceKVNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertSame(map.replace(null, EXTRA_VALUE), null);
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assertSame(map.get(null), EXTRA_VALUE);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=nonNull values=nonNull")
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public void testReplaceKVNoNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(FIRST_KEY), "expected key missing");
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assertSame(map.get(FIRST_KEY), FIRST_VALUE, "found wrong value");
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assertThrowsNPE(() -> map.replace(FIRST_KEY, null));
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assertSame(map.replace(FIRST_KEY, EXTRA_VALUE), FIRST_VALUE, description + ": replaced wrong value");
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assertSame(map.get(FIRST_KEY), EXTRA_VALUE, "found wrong value");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testReplaceKV(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(KEYS[1]));
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Object expected = map.get(KEYS[1]);
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assertTrue(null == expected || expected == VALUES[1]);
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assertSame(map.replace(KEYS[1], EXTRA_VALUE), expected);
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assertSame(map.get(KEYS[1]), EXTRA_VALUE);
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assertFalse(map.containsKey(EXTRA_KEY));
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assertNull(map.replace(EXTRA_KEY, EXTRA_VALUE));
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assertFalse(map.containsKey(EXTRA_KEY));
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assertNull(map.get(EXTRA_KEY));
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assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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assertSame(map.replace(EXTRA_KEY, (String)expected), EXTRA_VALUE);
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assertSame(map.get(EXTRA_KEY), expected);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testReplaceKVVNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertFalse(map.replace(null, EXTRA_VALUE, EXTRA_VALUE));
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assertNull(map.get(null));
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assertTrue(map.replace(null, null, EXTRA_VALUE));
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assertSame(map.get(null), EXTRA_VALUE);
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assertTrue(map.replace(null, EXTRA_VALUE, EXTRA_VALUE));
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assertSame(map.get(null), EXTRA_VALUE);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=nonNull values=nonNull")
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public void testReplaceKVVNoNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(FIRST_KEY), "expected key missing");
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assertSame(map.get(FIRST_KEY), FIRST_VALUE, "found wrong value");
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assertThrowsNPE(() -> map.replace(FIRST_KEY, FIRST_VALUE, null));
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assertThrowsNPE(
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() -> {
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if (!map.replace(FIRST_KEY, null, EXTRA_VALUE)) {
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throw new NullPointerException("default returns false rather than throwing");
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}
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});
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assertTrue(map.replace(FIRST_KEY, FIRST_VALUE, EXTRA_VALUE), description + ": replaced wrong value");
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assertSame(map.get(FIRST_KEY), EXTRA_VALUE, "found wrong value");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testReplaceKVV(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(KEYS[1]));
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Object expected = map.get(KEYS[1]);
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assertTrue(null == expected || expected == VALUES[1]);
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assertFalse(map.replace(KEYS[1], EXTRA_VALUE, EXTRA_VALUE));
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assertSame(map.get(KEYS[1]), expected);
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assertTrue(map.replace(KEYS[1], (String)expected, EXTRA_VALUE));
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assertSame(map.get(KEYS[1]), EXTRA_VALUE);
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assertTrue(map.replace(KEYS[1], EXTRA_VALUE, EXTRA_VALUE));
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assertSame(map.get(KEYS[1]), EXTRA_VALUE);
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assertFalse(map.containsKey(EXTRA_KEY));
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assertFalse(map.replace(EXTRA_KEY, EXTRA_VALUE, EXTRA_VALUE));
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assertFalse(map.containsKey(EXTRA_KEY));
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assertNull(map.get(EXTRA_KEY));
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assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
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assertTrue(map.containsKey(EXTRA_KEY));
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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assertTrue(map.replace(EXTRA_KEY, EXTRA_VALUE, EXTRA_VALUE));
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testComputeIfAbsentNulls(String description, Map<IntegerEnum, String> map) {
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// null -> null
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertSame(map.computeIfAbsent(null, (k) -> null), null, "not expected result");
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertSame(map.computeIfAbsent(null, (k) -> EXTRA_VALUE), EXTRA_VALUE, "not mapped to result");
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// null -> EXTRA_VALUE
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assertTrue(map.containsKey(null), "null key absent");
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assertSame(map.get(null), EXTRA_VALUE, "not expected value");
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assertSame(map.remove(null), EXTRA_VALUE, "removed unexpected value");
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// null -> <absent>
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assertFalse(map.containsKey(null), "null key present");
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assertSame(map.computeIfAbsent(null, (k) -> EXTRA_VALUE), EXTRA_VALUE, "not mapped to result");
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// null -> EXTRA_VALUE
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assertTrue(map.containsKey(null), "null key absent");
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assertSame(map.get(null), EXTRA_VALUE, "not expected value");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testComputeIfAbsent(String description, Map<IntegerEnum, String> map) {
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// 1 -> 1
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assertTrue(map.containsKey(KEYS[1]));
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Object expected = map.get(KEYS[1]);
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assertTrue(null == expected || expected == VALUES[1], description + String.valueOf(expected));
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expected = (null == expected) ? EXTRA_VALUE : expected;
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assertSame(map.computeIfAbsent(KEYS[1], (k) -> EXTRA_VALUE), expected, description);
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assertSame(map.get(KEYS[1]), expected, description);
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// EXTRA_KEY -> <absent>
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assertFalse(map.containsKey(EXTRA_KEY));
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assertNull(map.computeIfAbsent(EXTRA_KEY, (k) -> null));
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assertFalse(map.containsKey(EXTRA_KEY));
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assertSame(map.computeIfAbsent(EXTRA_KEY, (k) -> EXTRA_VALUE), EXTRA_VALUE);
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// EXTRA_KEY -> EXTRA_VALUE
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assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testComputeIfAbsentNullFunction(String description, Map<IntegerEnum, String> map) {
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assertThrowsNPE(() -> map.computeIfAbsent(KEYS[1], null));
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testComputeIfPresentNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), description + ": null key absent");
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assertNull(map.get(null), description + ": value not null");
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assertSame(map.computeIfPresent(null, (k, v) -> {
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fail(description + ": null value is not deemed present");
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return EXTRA_VALUE;
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}), null, description);
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assertTrue(map.containsKey(null));
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assertNull(map.get(null), description);
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assertNull(map.remove(EXTRA_KEY), description + ": unexpected mapping");
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assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
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assertSame(map.computeIfPresent(EXTRA_KEY, (k, v) -> {
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fail(description + ": null value is not deemed present");
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return EXTRA_VALUE;
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}), null, description);
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assertNull(map.get(EXTRA_KEY), description + ": null mapping gone");
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testComputeIfPresent(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(KEYS[1]));
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Object value = map.get(KEYS[1]);
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assertTrue(null == value || value == VALUES[1], description + String.valueOf(value));
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Object expected = (null == value) ? null : EXTRA_VALUE;
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assertSame(map.computeIfPresent(KEYS[1], (k, v) -> {
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assertSame(v, value);
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return EXTRA_VALUE;
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}), expected, description);
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assertSame(map.get(KEYS[1]), expected, description);
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assertFalse(map.containsKey(EXTRA_KEY));
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assertSame(map.computeIfPresent(EXTRA_KEY, (k, v) -> {
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fail();
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return EXTRA_VALUE;
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}), null);
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assertFalse(map.containsKey(EXTRA_KEY));
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assertSame(map.get(EXTRA_KEY), null);
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
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public void testComputeIfPresentNullFunction(String description, Map<IntegerEnum, String> map) {
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assertThrowsNPE(() -> map.computeIfPresent(KEYS[1], null));
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}
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@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull")
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public void testComputeNulls(String description, Map<IntegerEnum, String> map) {
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assertTrue(map.containsKey(null), "null key absent");
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assertNull(map.get(null), "value not null");
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assertSame(map.compute(null, (k, v) -> {
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assertNull(k);
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assertNull(v);
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return null;
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}), null, description);
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assertFalse(map.containsKey(null), description + ": null key present.");
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assertSame(map.compute(null, (k, v) -> {
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assertSame(k, null);
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assertNull(v);
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return EXTRA_VALUE;
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}), EXTRA_VALUE, description);
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assertTrue(map.containsKey(null));
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assertSame(map.get(null), EXTRA_VALUE, description);
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assertSame(map.remove(null), EXTRA_VALUE, description + ": removed value not expected");
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// no mapping before and after
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assertFalse(map.containsKey(null), description + ": null key present");
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assertSame(map.compute(null, (k, v) -> {
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assertNull(k);
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assertNull(v);
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return null;
|
|
}), null, description + ": expected null result" );
|
|
assertFalse(map.containsKey(null), description + ": null key present");
|
|
// compute with map not containing value
|
|
assertNull(map.remove(EXTRA_KEY), description + ": unexpected mapping");
|
|
assertFalse(map.containsKey(EXTRA_KEY), description + ": key present");
|
|
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
|
|
assertSame(k, EXTRA_KEY);
|
|
assertNull(v);
|
|
return null;
|
|
}), null, description);
|
|
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
|
|
// ensure removal.
|
|
assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
|
|
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
|
|
assertSame(k, EXTRA_KEY);
|
|
assertSame(v, EXTRA_VALUE);
|
|
return null;
|
|
}), null, description + ": null resulted expected");
|
|
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
|
|
// compute with map containing null value
|
|
assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
|
|
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
|
|
assertSame(k, EXTRA_KEY);
|
|
assertNull(v);
|
|
return null;
|
|
}), null, description);
|
|
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
|
|
assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
|
|
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
|
|
assertSame(k, EXTRA_KEY);
|
|
assertNull(v);
|
|
return EXTRA_VALUE;
|
|
}), EXTRA_VALUE, description);
|
|
assertTrue(map.containsKey(EXTRA_KEY), "null key present");
|
|
}
|
|
|
|
@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
|
|
public void testCompute(String description, Map<IntegerEnum, String> map) {
|
|
assertTrue(map.containsKey(KEYS[1]));
|
|
Object value = map.get(KEYS[1]);
|
|
assertTrue(null == value || value == VALUES[1], description + String.valueOf(value));
|
|
assertSame(map.compute(KEYS[1], (k, v) -> {
|
|
assertSame(k, KEYS[1]);
|
|
assertSame(v, value);
|
|
return EXTRA_VALUE;
|
|
}), EXTRA_VALUE, description);
|
|
assertSame(map.get(KEYS[1]), EXTRA_VALUE, description);
|
|
assertNull(map.compute(KEYS[1], (k, v) -> {
|
|
assertSame(v, EXTRA_VALUE);
|
|
return null;
|
|
}), description);
|
|
assertFalse(map.containsKey(KEYS[1]));
|
|
|
|
assertFalse(map.containsKey(EXTRA_KEY));
|
|
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
|
|
assertNull(v);
|
|
return EXTRA_VALUE;
|
|
}), EXTRA_VALUE);
|
|
assertTrue(map.containsKey(EXTRA_KEY));
|
|
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
|
|
}
|
|
|
|
@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
|
|
public void testComputeNullFunction(String description, Map<IntegerEnum, String> map) {
|
|
assertThrowsNPE(() -> map.compute(KEYS[1], null));
|
|
}
|
|
|
|
@Test(dataProvider = "MergeCases")
|
|
private void testMerge(String description, Map<IntegerEnum, String> map, Merging.Value oldValue, Merging.Value newValue, Merging.Merger merger, Merging.Value put, Merging.Value result) {
|
|
// add and check initial conditions.
|
|
switch (oldValue) {
|
|
case ABSENT :
|
|
map.remove(EXTRA_KEY);
|
|
assertFalse(map.containsKey(EXTRA_KEY), "key not absent");
|
|
break;
|
|
case NULL :
|
|
map.put(EXTRA_KEY, null);
|
|
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
|
|
assertNull(map.get(EXTRA_KEY), "wrong value");
|
|
break;
|
|
case OLDVALUE :
|
|
map.put(EXTRA_KEY, VALUES[1]);
|
|
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
|
|
assertSame(map.get(EXTRA_KEY), VALUES[1], "wrong value");
|
|
break;
|
|
default:
|
|
fail("unexpected old value");
|
|
}
|
|
|
|
String returned = map.merge(EXTRA_KEY,
|
|
newValue == Merging.Value.NULL ? (String) null : VALUES[2],
|
|
merger
|
|
);
|
|
|
|
// check result
|
|
|
|
switch (result) {
|
|
case NULL :
|
|
assertNull(returned, "wrong value");
|
|
break;
|
|
case NEWVALUE :
|
|
assertSame(returned, VALUES[2], "wrong value");
|
|
break;
|
|
case RESULT :
|
|
assertSame(returned, VALUES[3], "wrong value");
|
|
break;
|
|
default:
|
|
fail("unexpected new value");
|
|
}
|
|
|
|
// check map
|
|
switch (put) {
|
|
case ABSENT :
|
|
assertFalse(map.containsKey(EXTRA_KEY), "key not absent");
|
|
break;
|
|
case NULL :
|
|
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
|
|
assertNull(map.get(EXTRA_KEY), "wrong value");
|
|
break;
|
|
case NEWVALUE :
|
|
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
|
|
assertSame(map.get(EXTRA_KEY), VALUES[2], "wrong value");
|
|
break;
|
|
case RESULT :
|
|
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
|
|
assertSame(map.get(EXTRA_KEY), VALUES[3], "wrong value");
|
|
break;
|
|
default:
|
|
fail("unexpected new value");
|
|
}
|
|
}
|
|
|
|
@Test(dataProvider = "Map<IntegerEnum,String> rw=true keys=all values=all")
|
|
public void testMergeNullMerger(String description, Map<IntegerEnum, String> map) {
|
|
assertThrowsNPE(() -> map.merge(KEYS[1], VALUES[1], null));
|
|
}
|
|
|
|
/** A function that flipflops between running two other functions. */
|
|
static <T,U,V> BiFunction<T,U,V> twoStep(AtomicBoolean b,
|
|
BiFunction<T,U,V> first,
|
|
BiFunction<T,U,V> second) {
|
|
return (t, u) -> {
|
|
boolean bb = b.get();
|
|
try {
|
|
return (b.get() ? first : second).apply(t, u);
|
|
} finally {
|
|
b.set(!bb);
|
|
}};
|
|
}
|
|
|
|
/**
|
|
* Simulates races by modifying the map within the mapping function.
|
|
*/
|
|
@Test
|
|
public void testConcurrentMap_computeIfAbsent_racy() {
|
|
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
|
|
final Long two = 2L;
|
|
Function<Long,Long> f, g;
|
|
|
|
// race not detected if function returns null
|
|
f = (k) -> { map.put(two, 42L); return null; };
|
|
assertNull(map.computeIfAbsent(two, f));
|
|
assertEquals(42L, (long)map.get(two));
|
|
|
|
map.clear();
|
|
f = (k) -> { map.put(two, 42L); return 86L; };
|
|
assertEquals(42L, (long)map.computeIfAbsent(two, f));
|
|
assertEquals(42L, (long)map.get(two));
|
|
|
|
// mapping function ignored if value already exists
|
|
map.put(two, 99L);
|
|
assertEquals(99L, (long)map.computeIfAbsent(two, f));
|
|
assertEquals(99L, (long)map.get(two));
|
|
}
|
|
|
|
/**
|
|
* Simulates races by modifying the map within the remapping function.
|
|
*/
|
|
@Test
|
|
public void testConcurrentMap_computeIfPresent_racy() {
|
|
final AtomicBoolean b = new AtomicBoolean(true);
|
|
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
|
|
final Long two = 2L;
|
|
BiFunction<Long,Long,Long> f, g;
|
|
|
|
for (Long val : new Long[] { null, 86L }) {
|
|
map.clear();
|
|
|
|
// Function not invoked if no mapping exists
|
|
f = (k, v) -> { map.put(two, 42L); return val; };
|
|
assertNull(map.computeIfPresent(two, f));
|
|
assertNull(map.get(two));
|
|
|
|
map.put(two, 42L);
|
|
f = (k, v) -> { map.put(two, 86L); return val; };
|
|
g = (k, v) -> {
|
|
assertSame(two, k);
|
|
assertEquals(86L, (long)v);
|
|
return null;
|
|
};
|
|
assertNull(map.computeIfPresent(two, twoStep(b, f, g)));
|
|
assertFalse(map.containsKey(two));
|
|
assertTrue(b.get());
|
|
|
|
map.put(two, 42L);
|
|
f = (k, v) -> { map.put(two, 86L); return val; };
|
|
g = (k, v) -> {
|
|
assertSame(two, k);
|
|
assertEquals(86L, (long)v);
|
|
return 99L;
|
|
};
|
|
assertEquals(99L, (long)map.computeIfPresent(two, twoStep(b, f, g)));
|
|
assertTrue(map.containsKey(two));
|
|
assertTrue(b.get());
|
|
}
|
|
}
|
|
|
|
@Test
|
|
public void testConcurrentMap_compute_simple() {
|
|
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
|
|
BiFunction<Long,Long,Long> fun = (k, v) -> ((v == null) ? 0L : k + v);
|
|
assertEquals(Long.valueOf(0L), map.compute(3L, fun));
|
|
assertEquals(Long.valueOf(3L), map.compute(3L, fun));
|
|
assertEquals(Long.valueOf(6L), map.compute(3L, fun));
|
|
assertNull(map.compute(3L, (k, v) -> null));
|
|
assertTrue(map.isEmpty());
|
|
|
|
assertEquals(Long.valueOf(0L), map.compute(new Long(3L), fun));
|
|
assertEquals(Long.valueOf(3L), map.compute(new Long(3L), fun));
|
|
assertEquals(Long.valueOf(6L), map.compute(new Long(3L), fun));
|
|
assertNull(map.compute(3L, (k, v) -> null));
|
|
assertTrue(map.isEmpty());
|
|
}
|
|
|
|
/**
|
|
* Simulates races by modifying the map within the remapping function.
|
|
*/
|
|
@Test
|
|
public void testConcurrentMap_compute_racy() {
|
|
final AtomicBoolean b = new AtomicBoolean(true);
|
|
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
|
|
final Long two = 2L;
|
|
BiFunction<Long,Long,Long> f, g;
|
|
|
|
// null -> null is a no-op; race not detected
|
|
f = (k, v) -> { map.put(two, 42L); return null; };
|
|
assertNull(map.compute(two, f));
|
|
assertEquals(42L, (long)map.get(two));
|
|
|
|
for (Long val : new Long[] { null, 86L }) {
|
|
map.clear();
|
|
|
|
f = (k, v) -> { map.put(two, 42L); return 86L; };
|
|
g = (k, v) -> {
|
|
assertSame(two, k);
|
|
assertEquals(42L, (long)v);
|
|
return k + v;
|
|
};
|
|
assertEquals(44L, (long)map.compute(two, twoStep(b, f, g)));
|
|
assertEquals(44L, (long)map.get(two));
|
|
assertTrue(b.get());
|
|
|
|
f = (k, v) -> { map.remove(two); return val; };
|
|
g = (k, v) -> {
|
|
assertSame(two, k);
|
|
assertNull(v);
|
|
return 44L;
|
|
};
|
|
assertEquals(44L, (long)map.compute(two, twoStep(b, f, g)));
|
|
assertEquals(44L, (long)map.get(two));
|
|
assertTrue(map.containsKey(two));
|
|
assertTrue(b.get());
|
|
|
|
f = (k, v) -> { map.remove(two); return val; };
|
|
g = (k, v) -> {
|
|
assertSame(two, k);
|
|
assertNull(v);
|
|
return null;
|
|
};
|
|
assertNull(map.compute(two, twoStep(b, f, g)));
|
|
assertNull(map.get(two));
|
|
assertFalse(map.containsKey(two));
|
|
assertTrue(b.get());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Simulates races by modifying the map within the remapping function.
|
|
*/
|
|
@Test
|
|
public void testConcurrentMap_merge_racy() {
|
|
final AtomicBoolean b = new AtomicBoolean(true);
|
|
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
|
|
final Long two = 2L;
|
|
BiFunction<Long,Long,Long> f, g;
|
|
|
|
for (Long val : new Long[] { null, 86L }) {
|
|
map.clear();
|
|
|
|
f = (v, w) -> { throw new AssertionError(); };
|
|
assertEquals(99L, (long)map.merge(two, 99L, f));
|
|
assertEquals(99L, (long)map.get(two));
|
|
|
|
f = (v, w) -> { map.put(two, 42L); return val; };
|
|
g = (v, w) -> {
|
|
assertEquals(42L, (long)v);
|
|
assertEquals(3L, (long)w);
|
|
return v + w;
|
|
};
|
|
assertEquals(45L, (long)map.merge(two, 3L, twoStep(b, f, g)));
|
|
assertEquals(45L, (long)map.get(two));
|
|
assertTrue(b.get());
|
|
|
|
f = (v, w) -> { map.remove(two); return val; };
|
|
g = (k, v) -> { throw new AssertionError(); };
|
|
assertEquals(55L, (long)map.merge(two, 55L, twoStep(b, f, g)));
|
|
assertEquals(55L, (long)map.get(two));
|
|
assertTrue(map.containsKey(two));
|
|
assertFalse(b.get()); b.set(true);
|
|
}
|
|
}
|
|
|
|
public enum IntegerEnum {
|
|
|
|
e0, e1, e2, e3, e4, e5, e6, e7, e8, e9,
|
|
e10, e11, e12, e13, e14, e15, e16, e17, e18, e19,
|
|
e20, e21, e22, e23, e24, e25, e26, e27, e28, e29,
|
|
e30, e31, e32, e33, e34, e35, e36, e37, e38, e39,
|
|
e40, e41, e42, e43, e44, e45, e46, e47, e48, e49,
|
|
e50, e51, e52, e53, e54, e55, e56, e57, e58, e59,
|
|
e60, e61, e62, e63, e64, e65, e66, e67, e68, e69,
|
|
e70, e71, e72, e73, e74, e75, e76, e77, e78, e79,
|
|
e80, e81, e82, e83, e84, e85, e86, e87, e88, e89,
|
|
e90, e91, e92, e93, e94, e95, e96, e97, e98, e99,
|
|
EXTRA_KEY;
|
|
public static final int SIZE = values().length;
|
|
}
|
|
private static final int TEST_SIZE = IntegerEnum.SIZE - 1;
|
|
/**
|
|
* Realized keys ensure that there is always a hard ref to all test objects.
|
|
*/
|
|
private static final IntegerEnum[] KEYS = new IntegerEnum[TEST_SIZE];
|
|
/**
|
|
* Realized values ensure that there is always a hard ref to all test
|
|
* objects.
|
|
*/
|
|
private static final String[] VALUES = new String[TEST_SIZE];
|
|
|
|
static {
|
|
IntegerEnum[] keys = IntegerEnum.values();
|
|
for (int each = 0; each < TEST_SIZE; each++) {
|
|
KEYS[each] = keys[each];
|
|
VALUES[each] = String.valueOf(each);
|
|
}
|
|
}
|
|
|
|
private static final IntegerEnum FIRST_KEY = KEYS[0];
|
|
private static final String FIRST_VALUE = VALUES[0];
|
|
private static final IntegerEnum EXTRA_KEY = IntegerEnum.EXTRA_KEY;
|
|
private static final String EXTRA_VALUE = String.valueOf(TEST_SIZE);
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=all keys=all values=all", parallel = true)
|
|
public static Iterator<Object[]> allMapProvider() {
|
|
return makeAllMaps().iterator();
|
|
}
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=all keys=withNull values=withNull", parallel = true)
|
|
public static Iterator<Object[]> allMapWithNullsProvider() {
|
|
return makeAllMapsWithNulls().iterator();
|
|
}
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=true keys=nonNull values=nonNull", parallel = true)
|
|
public static Iterator<Object[]> rwNonNullMapProvider() {
|
|
return makeRWNoNullsMaps().iterator();
|
|
}
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=true keys=nonNull values=all", parallel = true)
|
|
public static Iterator<Object[]> rwNonNullKeysMapProvider() {
|
|
return makeRWMapsNoNulls().iterator();
|
|
}
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=true keys=all values=all", parallel = true)
|
|
public static Iterator<Object[]> rwMapProvider() {
|
|
return makeAllRWMaps().iterator();
|
|
}
|
|
|
|
@DataProvider(name = "Map<IntegerEnum,String> rw=true keys=withNull values=withNull", parallel = true)
|
|
public static Iterator<Object[]> rwNullsMapProvider() {
|
|
return makeAllRWMapsWithNulls().iterator();
|
|
}
|
|
|
|
private static Collection<Object[]> makeAllRWMapsWithNulls() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeRWMaps(true, true));
|
|
|
|
return all;
|
|
}
|
|
|
|
private static Collection<Object[]> makeRWMapsNoNulls() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeRWNoNullKeysMaps(false));
|
|
all.addAll(makeRWNoNullsMaps());
|
|
|
|
return all;
|
|
}
|
|
|
|
private static Collection<Object[]> makeAllROMaps() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeROMaps(false));
|
|
all.addAll(makeROMaps(true));
|
|
|
|
return all;
|
|
}
|
|
|
|
private static Collection<Object[]> makeAllRWMaps() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeRWNoNullsMaps());
|
|
all.addAll(makeRWMaps(false,true));
|
|
all.addAll(makeRWMaps(true,true));
|
|
all.addAll(makeRWNoNullKeysMaps(true));
|
|
return all;
|
|
}
|
|
|
|
private static Collection<Object[]> makeAllMaps() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeAllROMaps());
|
|
all.addAll(makeAllRWMaps());
|
|
|
|
return all;
|
|
}
|
|
|
|
private static Collection<Object[]> makeAllMapsWithNulls() {
|
|
Collection<Object[]> all = new ArrayList<>();
|
|
|
|
all.addAll(makeROMaps(true));
|
|
all.addAll(makeRWMaps(true,true));
|
|
|
|
return all;
|
|
}
|
|
|
|
/**
|
|
* @param nullKeys include null keys
|
|
* @param nullValues include null values
|
|
* @return
|
|
*/
|
|
private static Collection<Object[]> makeRWMaps(boolean nullKeys, boolean nullValues) {
|
|
return Arrays.asList(
|
|
new Object[]{"HashMap", makeMap(HashMap::new, nullKeys, nullValues)},
|
|
new Object[]{"IdentityHashMap", makeMap(IdentityHashMap::new, nullKeys, nullValues)},
|
|
new Object[]{"LinkedHashMap", makeMap(LinkedHashMap::new, nullKeys, nullValues)},
|
|
new Object[]{"WeakHashMap", makeMap(WeakHashMap::new, nullKeys, nullValues)},
|
|
new Object[]{"Collections.checkedMap(HashMap)", Collections.checkedMap(makeMap(HashMap::new, nullKeys, nullValues), IntegerEnum.class, String.class)},
|
|
new Object[]{"Collections.synchronizedMap(HashMap)", Collections.synchronizedMap(makeMap(HashMap::new, nullKeys, nullValues))},
|
|
new Object[]{"ExtendsAbstractMap", makeMap(ExtendsAbstractMap::new, nullKeys, nullValues)});
|
|
}
|
|
|
|
/**
|
|
* @param nulls include null values
|
|
* @return
|
|
*/
|
|
private static Collection<Object[]> makeRWNoNullKeysMaps(boolean nulls) {
|
|
return Arrays.asList(
|
|
// null key hostile
|
|
new Object[]{"EnumMap", makeMap(() -> new EnumMap(IntegerEnum.class), false, nulls)},
|
|
new Object[]{"TreeMap", makeMap(TreeMap::new, false, nulls)},
|
|
new Object[]{"ExtendsAbstractMap(TreeMap)", makeMap(() -> {return new ExtendsAbstractMap(new TreeMap());}, false, nulls)},
|
|
new Object[]{"Collections.synchronizedMap(EnumMap)", Collections.synchronizedMap(makeMap(() -> new EnumMap(IntegerEnum.class), false, nulls))}
|
|
);
|
|
}
|
|
|
|
private static Collection<Object[]> makeRWNoNullsMaps() {
|
|
return Arrays.asList(
|
|
// null key and value hostile
|
|
new Object[]{"Hashtable", makeMap(Hashtable::new, false, false)},
|
|
new Object[]{"ConcurrentHashMap", makeMap(ConcurrentHashMap::new, false, false)},
|
|
new Object[]{"ConcurrentSkipListMap", makeMap(ConcurrentSkipListMap::new, false, false)},
|
|
new Object[]{"Collections.synchronizedMap(ConcurrentHashMap)", Collections.synchronizedMap(makeMap(ConcurrentHashMap::new, false, false))},
|
|
new Object[]{"Collections.checkedMap(ConcurrentHashMap)", Collections.checkedMap(makeMap(ConcurrentHashMap::new, false, false), IntegerEnum.class, String.class)},
|
|
new Object[]{"ExtendsAbstractMap(ConcurrentHashMap)", makeMap(() -> {return new ExtendsAbstractMap(new ConcurrentHashMap());}, false, false)},
|
|
new Object[]{"ImplementsConcurrentMap", makeMap(ImplementsConcurrentMap::new, false, false)}
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param nulls include nulls
|
|
* @return
|
|
*/
|
|
private static Collection<Object[]> makeROMaps(boolean nulls) {
|
|
return Arrays.asList(new Object[][]{
|
|
new Object[]{"Collections.unmodifiableMap(HashMap)", Collections.unmodifiableMap(makeMap(HashMap::new, nulls, nulls))}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* @param supplier a supplier of mutable map instances.
|
|
*
|
|
* @param nullKeys include null keys
|
|
* @param nullValues include null values
|
|
* @return
|
|
*/
|
|
private static Map<IntegerEnum, String> makeMap(Supplier<Map<IntegerEnum, String>> supplier, boolean nullKeys, boolean nullValues) {
|
|
Map<IntegerEnum, String> result = supplier.get();
|
|
|
|
for (int each = 0; each < TEST_SIZE; each++) {
|
|
IntegerEnum key = nullKeys ? (each == 0) ? null : KEYS[each] : KEYS[each];
|
|
String value = nullValues ? (each == 0) ? null : VALUES[each] : VALUES[each];
|
|
|
|
result.put(key, value);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static class Merging {
|
|
public enum Value {
|
|
ABSENT,
|
|
NULL,
|
|
OLDVALUE,
|
|
NEWVALUE,
|
|
RESULT
|
|
}
|
|
|
|
public enum Merger implements BiFunction<String,String,String> {
|
|
UNUSED {
|
|
public String apply(String oldValue, String newValue) {
|
|
fail("should not be called");
|
|
return null;
|
|
}
|
|
},
|
|
NULL {
|
|
public String apply(String oldValue, String newValue) {
|
|
return null;
|
|
}
|
|
},
|
|
RESULT {
|
|
public String apply(String oldValue, String newValue) {
|
|
return VALUES[3];
|
|
}
|
|
},
|
|
}
|
|
}
|
|
|
|
@DataProvider(name = "MergeCases", parallel = true)
|
|
public Iterator<Object[]> mergeCasesProvider() {
|
|
Collection<Object[]> cases = new ArrayList<>();
|
|
|
|
cases.addAll(makeMergeTestCases());
|
|
|
|
return cases.iterator();
|
|
}
|
|
|
|
static Collection<Object[]> makeMergeTestCases() {
|
|
Collection<Object[]> cases = new ArrayList<>();
|
|
|
|
for (Object[] mapParams : makeAllRWMaps() ) {
|
|
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.ABSENT, Merging.Value.NEWVALUE, Merging.Merger.UNUSED, Merging.Value.NEWVALUE, Merging.Value.NEWVALUE });
|
|
}
|
|
|
|
for (Object[] mapParams : makeAllRWMaps() ) {
|
|
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.OLDVALUE, Merging.Value.NEWVALUE, Merging.Merger.NULL, Merging.Value.ABSENT, Merging.Value.NULL });
|
|
}
|
|
|
|
for (Object[] mapParams : makeAllRWMaps() ) {
|
|
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.OLDVALUE, Merging.Value.NEWVALUE, Merging.Merger.RESULT, Merging.Value.RESULT, Merging.Value.RESULT });
|
|
}
|
|
|
|
return cases;
|
|
}
|
|
|
|
public static void assertThrowsNPE(ThrowingRunnable r) {
|
|
assertThrows(NullPointerException.class, r);
|
|
}
|
|
|
|
/**
|
|
* A simple mutable map implementation that provides only default
|
|
* implementations of all methods. ie. none of the Map interface default
|
|
* methods have overridden implementations.
|
|
*
|
|
* @param <K> Type of keys
|
|
* @param <V> Type of values
|
|
*/
|
|
public static class ExtendsAbstractMap<M extends Map<K,V>, K, V> extends AbstractMap<K,V> {
|
|
|
|
protected final M map;
|
|
|
|
public ExtendsAbstractMap() { this( (M) new HashMap<K,V>()); }
|
|
|
|
protected ExtendsAbstractMap(M map) { this.map = map; }
|
|
|
|
@Override public Set<Map.Entry<K,V>> entrySet() {
|
|
return new AbstractSet<Map.Entry<K,V>>() {
|
|
@Override public int size() {
|
|
return map.size();
|
|
}
|
|
|
|
@Override public Iterator<Map.Entry<K,V>> iterator() {
|
|
final Iterator<Map.Entry<K,V>> source = map.entrySet().iterator();
|
|
return new Iterator<Map.Entry<K,V>>() {
|
|
public boolean hasNext() { return source.hasNext(); }
|
|
public Map.Entry<K,V> next() { return source.next(); }
|
|
public void remove() { source.remove(); }
|
|
};
|
|
}
|
|
|
|
@Override public boolean add(Map.Entry<K,V> e) {
|
|
return map.entrySet().add(e);
|
|
}
|
|
};
|
|
}
|
|
|
|
@Override public V put(K key, V value) {
|
|
return map.put(key, value);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A simple mutable concurrent map implementation that provides only default
|
|
* implementations of all methods, i.e. none of the ConcurrentMap interface
|
|
* default methods have overridden implementations.
|
|
*
|
|
* @param <K> Type of keys
|
|
* @param <V> Type of values
|
|
*/
|
|
public static class ImplementsConcurrentMap<K,V> extends ExtendsAbstractMap<ConcurrentMap<K,V>, K, V> implements ConcurrentMap<K,V> {
|
|
public ImplementsConcurrentMap() { super(new ConcurrentHashMap<K,V>()); }
|
|
|
|
// ConcurrentMap reabstracts these methods.
|
|
//
|
|
// Unlike ConcurrentHashMap, we have zero tolerance for null values.
|
|
|
|
@Override public V replace(K k, V v) {
|
|
return map.replace(requireNonNull(k), requireNonNull(v));
|
|
}
|
|
|
|
@Override public boolean replace(K k, V v, V vv) {
|
|
return map.replace(requireNonNull(k),
|
|
requireNonNull(v),
|
|
requireNonNull(vv));
|
|
}
|
|
|
|
@Override public boolean remove(Object k, Object v) {
|
|
return map.remove(requireNonNull(k), requireNonNull(v));
|
|
}
|
|
|
|
@Override public V putIfAbsent(K k, V v) {
|
|
return map.putIfAbsent(requireNonNull(k), requireNonNull(v));
|
|
}
|
|
}
|
|
}
|