UUIDTest.java revision 6073:cea72c2bf071
1/* 2 * Copyright (c) 2003, 2012, 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/* @test 25 * @bug 4173528 5068772 26 * @summary Unit tests for java.util.UUID 27 */ 28 29import java.util.*; 30 31public class UUIDTest { 32 33 static Random generator = new Random(); 34 35 public static void main(String[] args) throws Exception { 36 containsTest(); 37 randomUUIDTest(); 38 nameUUIDFromBytesTest(); 39 stringTest(); 40 versionTest(); 41 variantTest(); 42 timestampTest(); 43 clockSequenceTest(); 44 nodeTest(); 45 hashCodeEqualsTest(); 46 compareTo(); 47 } 48 49 // Verify that list.contains detects UUID collisons 50 private static void containsTest() throws Exception { 51 List list = new LinkedList(); 52 list.add(new UUID(4,4)); 53 if (!list.contains(new UUID(4,4))) 54 throw new Exception("contains test did not work as expected"); 55 } 56 57 private static void randomUUIDTest() throws Exception { 58 List list = new LinkedList(); 59 for (int i=0; i<100; i++) { 60 UUID u1 = UUID.randomUUID(); 61 if (4 != u1.version()) { 62 throw new Exception("bad version"); 63 } 64 if (2 != u1.variant()) { 65 throw new Exception("bad variant"); 66 } 67 if (list.contains(u1)) 68 throw new Exception("random UUID collision very unlikely"); 69 list.add(u1); 70 } 71 } 72 73 private static void nameUUIDFromBytesTest() throws Exception { 74 Random byteSource = new Random(); 75 byte[] someBytes = new byte[12]; 76 List list = new LinkedList(); 77 for (int i=0; i<100; i++) { 78 byteSource.nextBytes(someBytes); 79 UUID u1 = UUID.nameUUIDFromBytes(someBytes); 80 if (3 != u1.version()) { 81 throw new Exception("bad version"); 82 } 83 if (2 != u1.variant()) { 84 throw new Exception("bad variant"); 85 } 86 if (list.contains(u1)) 87 throw new Exception("byte UUID collision very unlikely"); 88 list.add(u1); 89 } 90 } 91 92 private static void stringTest() throws Exception { 93 for (int i=0; i<100; i++) { 94 UUID u1 = UUID.randomUUID(); 95 UUID u2 = UUID.fromString(u1.toString()); 96 if (!u1.equals(u2)) 97 throw new Exception("UUID -> string -> UUID failed"); 98 } 99 } 100 101 private static void versionTest() throws Exception { 102 UUID test = UUID.randomUUID(); 103 if (test.version() != 4) 104 throw new Exception("randomUUID not type 4"); 105 Random byteSource = new Random(); 106 byte[] someBytes = new byte[12]; 107 byteSource.nextBytes(someBytes); 108 test = UUID.nameUUIDFromBytes(someBytes); 109 if (test.version() != 3) 110 throw new Exception("nameUUIDFromBytes not type 3"); 111 test = UUID.fromString("9835451d-e2e0-1e41-8a5a-be785f17dcda"); 112 if (test.version() != 1) 113 throw new Exception("wrong version fromString 1"); 114 test = UUID.fromString("9835451d-e2e0-2e41-8a5a-be785f17dcda"); 115 if (test.version() != 2) 116 throw new Exception("wrong version fromString 2"); 117 test = UUID.fromString("9835451d-e2e0-3e41-8a5a-be785f17dcda"); 118 if (test.version() != 3) 119 throw new Exception("wrong version fromString 3"); 120 test = UUID.fromString("9835451d-e2e0-4e41-8a5a-be785f17dcda"); 121 if (test.version() != 4) 122 throw new Exception("wrong version fromString 4"); 123 test = new UUID(0x0000000000001000L, 55L); 124 if (test.version() != 1) 125 throw new Exception("wrong version from bit set to 1"); 126 test = new UUID(0x0000000000002000L, 55L); 127 if (test.version() != 2) 128 throw new Exception("wrong version from bit set to 2"); 129 test = new UUID(0x0000000000003000L, 55L); 130 if (test.version() != 3) 131 throw new Exception("wrong version from bit set to 3"); 132 test = new UUID(0x0000000000004000L, 55L); 133 if (test.version() != 4) 134 throw new Exception("wrong version from bit set to 4"); 135 } 136 137 private static void variantTest() throws Exception { 138 UUID test = UUID.randomUUID(); 139 if (test.variant() != 2) 140 throw new Exception("randomUUID not variant 2"); 141 Random byteSource = new Random(); 142 byte[] someBytes = new byte[12]; 143 byteSource.nextBytes(someBytes); 144 test = UUID.nameUUIDFromBytes(someBytes); 145 if (test.variant() != 2) 146 throw new Exception("nameUUIDFromBytes not variant 2"); 147 test = new UUID(55L, 0x0000000000001000L); 148 if (test.variant() != 0) 149 throw new Exception("wrong variant from bit set to 0"); 150 test = new UUID(55L, 0x8000000000001000L); 151 if (test.variant() != 2) 152 throw new Exception("wrong variant from bit set to 2"); 153 test = new UUID(55L, 0xc000000000001000L); 154 if (test.variant() != 6) 155 throw new Exception("wrong variant from bit set to 6"); 156 test = new UUID(55L, 0xe000000000001000L); 157 if (test.variant() != 7) 158 throw new Exception("wrong variant from bit set to 7"); 159 } 160 161 private static void timestampTest() throws Exception { 162 UUID test = UUID.randomUUID(); 163 try { 164 test.timestamp(); 165 throw new Exception("Expected exception not thrown"); 166 } catch (UnsupportedOperationException uoe) { 167 // Correct result 168 } 169 test = UUID.fromString("00000001-0000-1000-8a5a-be785f17dcda"); 170 if (test.timestamp() != 1) 171 throw new Exception("Incorrect timestamp"); 172 test = UUID.fromString("00000400-0000-1000-8a5a-be785f17dcda"); 173 if (test.timestamp() != 1024) 174 throw new Exception("Incorrect timestamp"); 175 test = UUID.fromString("FFFFFFFF-FFFF-1FFF-8a5a-be785f17dcda"); 176 if (test.timestamp() != Long.MAX_VALUE>>3) 177 throw new Exception("Incorrect timestamp"); 178 } 179 180 private static void clockSequenceTest() throws Exception { 181 UUID test = UUID.randomUUID(); 182 try { 183 test.clockSequence(); 184 throw new Exception("Expected exception not thrown"); 185 } catch (UnsupportedOperationException uoe) { 186 // Correct result 187 } 188 test = UUID.fromString("00000001-0000-1000-8001-be785f17dcda"); 189 if (test.clockSequence() != 1) 190 throw new Exception("Incorrect sequence"); 191 test = UUID.fromString("00000001-0000-1000-8002-be785f17dcda"); 192 if (test.clockSequence() != 2) 193 throw new Exception("Incorrect sequence"); 194 test = UUID.fromString("00000001-0000-1000-8010-be785f17dcda"); 195 if (test.clockSequence() != 16) 196 throw new Exception("Incorrect sequence"); 197 test = UUID.fromString("00000001-0000-1000-bFFF-be785f17dcda"); 198 if (test.clockSequence() != ((2L<<13)-1)) // 2^14 - 1 199 throw new Exception("Incorrect sequence"); 200 } 201 202 private static void nodeTest() throws Exception { 203 UUID test = UUID.randomUUID(); 204 try { 205 test.node(); 206 throw new Exception("Expected exception not thrown"); 207 } catch (UnsupportedOperationException uoe) { 208 // Correct result 209 } 210 test = UUID.fromString("00000001-0000-1000-8001-000000000001"); 211 if (test.node() != 1) 212 throw new Exception("Incorrect node"); 213 test = UUID.fromString("00000001-0000-1000-8002-FFFFFFFFFFFF"); 214 if (test.node() != ((2L<<47)-1)) // 2^48 - 1 215 throw new Exception("Incorrect node"); 216 } 217 218 private static void hashCodeEqualsTest() throws Exception { 219 // If two UUIDs are equal they must have the same hashCode 220 for (int i=0; i<100; i++) { 221 UUID u1 = UUID.randomUUID(); 222 UUID u2 = UUID.fromString(u1.toString()); 223 if (u1.hashCode() != u2.hashCode()) 224 throw new Exception("Equal UUIDs with different hashcodes"); 225 } 226 // Test equality of UUIDs with tampered bits 227 for (int i=0; i<1000; i++) { 228 long l = generator.nextLong(); 229 long l2 = generator.nextLong(); 230 int position = generator.nextInt(64); 231 UUID u1 = new UUID(l, l2); 232 l = l ^ (1L << position); 233 UUID u2 = new UUID(l, l2); 234 if (u1.equals(u2)) 235 throw new Exception("UUIDs with different bits equal"); 236 } 237 } 238 239 private static void compareTo() throws Exception { 240 UUID id = new UUID(33L, 63L); 241 UUID id2 = new UUID(34L, 62L); 242 UUID id3 = new UUID(34L, 63L); 243 UUID id4 = new UUID(34L, 64L); 244 UUID id5 = new UUID(35L, 63L); 245 246 if ((id.compareTo(id2) >= 0) || 247 (id2.compareTo(id3) >= 0) || 248 (id3.compareTo(id4) >= 0) || 249 (id4.compareTo(id5) >= 0)) 250 throw new RuntimeException("compareTo failure"); 251 252 if ((id5.compareTo(id4) <= 0) || 253 (id4.compareTo(id3) <= 0) || 254 (id3.compareTo(id2) <= 0) || 255 (id2.compareTo(id) <= 0)) 256 throw new RuntimeException("compareTo failure"); 257 258 if (id.compareTo(id) != 0) 259 throw new RuntimeException("compareTo failure"); 260 261 } 262 263} 264