1 /* 2 * Copyright (c) 2013, 2020, 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 /** 25 * @test 26 * @bug 8017231 8020977 8054221 27 * @summary test StringJoiner::merge 28 * @modules java.base/jdk.internal.util 29 * @requires vm.bits == "64" & os.maxMemory > 4G 30 * @run testng/othervm -Xmx4g -XX:+CompactStrings MergeTest 31 */ 32 33 import java.util.StringJoiner; 34 import java.util.stream.Stream; 35 import org.testng.annotations.Test; 36 import static jdk.internal.util.ArraysSupport.MAX_ARRAY_LENGTH; 37 import static org.testng.Assert.assertEquals; 38 import static org.testng.Assert.fail; 39 40 @Test 41 public class MergeTest { 42 private static final String[] PREFIXES = {"", "{", "@#$%"}; 43 private static final String[] SUFFIXES = {"", "}", "*&%$"}; 44 45 private static class Fixes { 46 public String pre0, suf0; 47 public String pre1, suf1; Fixes(String prefix0, String suffix0, String prefix1, String suffix1)48 public Fixes(String prefix0, String suffix0, 49 String prefix1, String suffix1) { 50 this.pre0 = prefix0; 51 this.suf0 = suffix0; 52 this.pre1 = prefix1; 53 this.suf1 = suffix1; 54 } 55 } 56 fixesStream()57 private static Stream<Fixes> fixesStream() { 58 Stream.Builder<Fixes> builder = Stream.builder(); 59 for (final String prefix0 : PREFIXES) { 60 for (final String suffix0 : SUFFIXES) { 61 for (final String prefix1 : PREFIXES) { 62 for (final String suffix1 : SUFFIXES) { 63 builder.accept(new Fixes(prefix0, suffix0, 64 prefix1, suffix1)); 65 } 66 } 67 } 68 } 69 return builder.build(); 70 } 71 72 @Test(expectedExceptions = {NullPointerException.class}) testNull()73 public void testNull() { 74 StringJoiner sj = new StringJoiner(",", "{", "}"); 75 sj.merge(null); 76 } 77 testSimple()78 public void testSimple() { 79 fixesStream().forEach(fixes -> { 80 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 81 StringJoiner other = new StringJoiner(",", fixes.pre1, fixes.suf1); 82 Stream.of("a", "b", "c").forEachOrdered(sj::add); 83 Stream.of("d", "e", "f").forEachOrdered(other::add); 84 85 sj.merge(other); 86 assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d,e,f" + fixes.suf0); 87 }); 88 } 89 testEmptyOther()90 public void testEmptyOther() { 91 fixesStream().forEach(fixes -> { 92 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 93 StringJoiner other = new StringJoiner(",", fixes.pre1, fixes.suf1); 94 Stream.of("a", "b", "c").forEachOrdered(sj::add); 95 96 sj.merge(other); 97 assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0); 98 99 other.setEmptyValue("EMPTY"); 100 sj.merge(other); 101 assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0); 102 }); 103 } 104 testEmptyThis()105 public void testEmptyThis() { 106 fixesStream().forEach(fixes -> { 107 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 108 StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1); 109 Stream.of("d", "e", "f").forEachOrdered(other::add); 110 111 sj.merge(other); 112 assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0); 113 114 sj = new StringJoiner(",", fixes.pre0, fixes.suf0).setEmptyValue("EMPTY"); 115 assertEquals(sj.toString(), "EMPTY"); 116 sj.merge(other); 117 assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0); 118 }); 119 } 120 testEmptyBoth()121 public void testEmptyBoth() { 122 fixesStream().forEach(fixes -> { 123 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 124 StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1); 125 126 sj.merge(other); 127 assertEquals(sj.toString(), fixes.pre0 + fixes.suf0); 128 129 other.setEmptyValue("NOTHING"); 130 sj.merge(other); 131 assertEquals(sj.toString(), fixes.pre0 + fixes.suf0); 132 133 sj = new StringJoiner(",", fixes.pre0, fixes.suf0).setEmptyValue("EMPTY"); 134 assertEquals(sj.toString(), "EMPTY"); 135 sj.merge(other); 136 assertEquals(sj.toString(), "EMPTY"); 137 }); 138 } 139 testCascadeEmpty()140 public void testCascadeEmpty() { 141 fixesStream().forEach(fixes -> { 142 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 143 StringJoiner o1 = new StringJoiner(":", fixes.pre1, fixes.suf1).setEmptyValue("Empty1"); 144 StringJoiner o2 = new StringJoiner(",", "<", ">").setEmptyValue("Empty2"); 145 146 o1.merge(o2); 147 assertEquals(o1.toString(), "Empty1"); 148 149 sj.merge(o1); 150 assertEquals(sj.toString(), fixes.pre0 + fixes.suf0); 151 }); 152 } 153 testDelimiter()154 public void testDelimiter() { 155 fixesStream().forEach(fixes -> { 156 StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0); 157 StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1); 158 Stream.of("a", "b", "c").forEachOrdered(sj::add); 159 Stream.of("d", "e", "f").forEachOrdered(other::add); 160 161 sj.merge(other); 162 assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d:e:f" + fixes.suf0); 163 }); 164 } 165 testMergeSelf()166 public void testMergeSelf() { 167 fixesStream().forEach(fixes -> { 168 final StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0).add("a").add("b"); 169 assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b" + fixes.suf0); 170 assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b,a,b,a,b" + fixes.suf0); 171 }); 172 } 173 OOM()174 public void OOM() { 175 String maxString = "*".repeat(MAX_ARRAY_LENGTH); 176 177 try { 178 StringJoiner sj1 = new StringJoiner("", "", ""); 179 sj1.add(maxString); 180 StringJoiner sj2 = new StringJoiner("", "", ""); 181 sj2.add(maxString); 182 sj1.merge(sj2); 183 fail("Should have thrown OutOfMemoryError"); 184 } catch (OutOfMemoryError ex) { 185 // okay 186 } 187 } 188 } 189