Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 | * Expert Group and released to the public domain, as explained at |
| 4 | * http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 | */ |
| 6 | |
| 7 | package jsr166; |
| 8 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 9 | import java.util.Arrays; |
| 10 | import java.util.BitSet; |
| 11 | import java.util.Collection; |
| 12 | import java.util.Comparator; |
| 13 | import java.util.Iterator; |
| 14 | import java.util.NavigableSet; |
| 15 | import java.util.NoSuchElementException; |
| 16 | import java.util.Random; |
| 17 | import java.util.Set; |
| 18 | import java.util.SortedSet; |
| 19 | import java.util.concurrent.ConcurrentSkipListSet; |
| 20 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 21 | import junit.framework.Test; |
| 22 | import junit.framework.TestSuite; |
| 23 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 24 | public class ConcurrentSkipListSetTest extends JSR166TestCase { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 25 | // android-note: Removed because the CTS runner does a bad job of |
| 26 | // retrying tests that have suite() declarations. |
| 27 | // |
| 28 | // public static void main(String[] args) { |
| 29 | // main(suite(), args); |
| 30 | // } |
| 31 | // public static Test suite() { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 32 | // return new TestSuite(ConcurrentSkipListSetTest.class); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 33 | // } |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 34 | |
| 35 | static class MyReverseComparator implements Comparator { |
| 36 | public int compare(Object x, Object y) { |
| 37 | return ((Comparable)y).compareTo(x); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Returns a new set of given size containing consecutive |
| 43 | * Integers 0 ... n. |
| 44 | */ |
| 45 | private ConcurrentSkipListSet<Integer> populatedSet(int n) { |
| 46 | ConcurrentSkipListSet<Integer> q = |
| 47 | new ConcurrentSkipListSet<Integer>(); |
| 48 | assertTrue(q.isEmpty()); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 49 | for (int i = n - 1; i >= 0; i -= 2) |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 50 | assertTrue(q.add(new Integer(i))); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 51 | for (int i = (n & 1); i < n; i += 2) |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 52 | assertTrue(q.add(new Integer(i))); |
| 53 | assertFalse(q.isEmpty()); |
| 54 | assertEquals(n, q.size()); |
| 55 | return q; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Returns a new set of first 5 ints. |
| 60 | */ |
| 61 | private ConcurrentSkipListSet set5() { |
| 62 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 63 | assertTrue(q.isEmpty()); |
| 64 | q.add(one); |
| 65 | q.add(two); |
| 66 | q.add(three); |
| 67 | q.add(four); |
| 68 | q.add(five); |
| 69 | assertEquals(5, q.size()); |
| 70 | return q; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * A new set has unbounded capacity |
| 75 | */ |
| 76 | public void testConstructor1() { |
| 77 | assertEquals(0, new ConcurrentSkipListSet().size()); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Initializing from null Collection throws NPE |
| 82 | */ |
| 83 | public void testConstructor3() { |
| 84 | try { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 85 | new ConcurrentSkipListSet((Collection)null); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 86 | shouldThrow(); |
| 87 | } catch (NullPointerException success) {} |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Initializing from Collection of null elements throws NPE |
| 92 | */ |
| 93 | public void testConstructor4() { |
| 94 | try { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 95 | new ConcurrentSkipListSet(Arrays.asList(new Integer[SIZE])); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 96 | shouldThrow(); |
| 97 | } catch (NullPointerException success) {} |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Initializing from Collection with some null elements throws NPE |
| 102 | */ |
| 103 | public void testConstructor5() { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 104 | Integer[] ints = new Integer[SIZE]; |
| 105 | for (int i = 0; i < SIZE - 1; ++i) |
| 106 | ints[i] = new Integer(i); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 107 | try { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 108 | new ConcurrentSkipListSet(Arrays.asList(ints)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 109 | shouldThrow(); |
| 110 | } catch (NullPointerException success) {} |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Set contains all elements of collection used to initialize |
| 115 | */ |
| 116 | public void testConstructor6() { |
| 117 | Integer[] ints = new Integer[SIZE]; |
| 118 | for (int i = 0; i < SIZE; ++i) |
| 119 | ints[i] = new Integer(i); |
| 120 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(Arrays.asList(ints)); |
| 121 | for (int i = 0; i < SIZE; ++i) |
| 122 | assertEquals(ints[i], q.pollFirst()); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * The comparator used in constructor is used |
| 127 | */ |
| 128 | public void testConstructor7() { |
| 129 | MyReverseComparator cmp = new MyReverseComparator(); |
| 130 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(cmp); |
| 131 | assertEquals(cmp, q.comparator()); |
| 132 | Integer[] ints = new Integer[SIZE]; |
| 133 | for (int i = 0; i < SIZE; ++i) |
| 134 | ints[i] = new Integer(i); |
| 135 | q.addAll(Arrays.asList(ints)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 136 | for (int i = SIZE - 1; i >= 0; --i) |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 137 | assertEquals(ints[i], q.pollFirst()); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * isEmpty is true before add, false after |
| 142 | */ |
| 143 | public void testEmpty() { |
| 144 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 145 | assertTrue(q.isEmpty()); |
| 146 | q.add(new Integer(1)); |
| 147 | assertFalse(q.isEmpty()); |
| 148 | q.add(new Integer(2)); |
| 149 | q.pollFirst(); |
| 150 | q.pollFirst(); |
| 151 | assertTrue(q.isEmpty()); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * size changes when elements added and removed |
| 156 | */ |
| 157 | public void testSize() { |
| 158 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 159 | for (int i = 0; i < SIZE; ++i) { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 160 | assertEquals(SIZE - i, q.size()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 161 | q.pollFirst(); |
| 162 | } |
| 163 | for (int i = 0; i < SIZE; ++i) { |
| 164 | assertEquals(i, q.size()); |
| 165 | q.add(new Integer(i)); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * add(null) throws NPE |
| 171 | */ |
| 172 | public void testAddNull() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 173 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 174 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 175 | q.add(null); |
| 176 | shouldThrow(); |
| 177 | } catch (NullPointerException success) {} |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Add of comparable element succeeds |
| 182 | */ |
| 183 | public void testAdd() { |
| 184 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 185 | assertTrue(q.add(zero)); |
| 186 | assertTrue(q.add(one)); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Add of duplicate element fails |
| 191 | */ |
| 192 | public void testAddDup() { |
| 193 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 194 | assertTrue(q.add(zero)); |
| 195 | assertFalse(q.add(zero)); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Add of non-Comparable throws CCE |
| 200 | */ |
| 201 | public void testAddNonComparable() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 202 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 203 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 204 | q.add(new Object()); |
| 205 | q.add(new Object()); |
| 206 | shouldThrow(); |
| 207 | } catch (ClassCastException success) {} |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * addAll(null) throws NPE |
| 212 | */ |
| 213 | public void testAddAll1() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 214 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 215 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 216 | q.addAll(null); |
| 217 | shouldThrow(); |
| 218 | } catch (NullPointerException success) {} |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * addAll of a collection with null elements throws NPE |
| 223 | */ |
| 224 | public void testAddAll2() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 225 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 226 | Integer[] ints = new Integer[SIZE]; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 227 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 228 | q.addAll(Arrays.asList(ints)); |
| 229 | shouldThrow(); |
| 230 | } catch (NullPointerException success) {} |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * addAll of a collection with any null elements throws NPE after |
| 235 | * possibly adding some elements |
| 236 | */ |
| 237 | public void testAddAll3() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 238 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 239 | Integer[] ints = new Integer[SIZE]; |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 240 | for (int i = 0; i < SIZE - 1; ++i) |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 241 | ints[i] = new Integer(i); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 242 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 243 | q.addAll(Arrays.asList(ints)); |
| 244 | shouldThrow(); |
| 245 | } catch (NullPointerException success) {} |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Set contains all elements of successful addAll |
| 250 | */ |
| 251 | public void testAddAll5() { |
| 252 | Integer[] empty = new Integer[0]; |
| 253 | Integer[] ints = new Integer[SIZE]; |
| 254 | for (int i = 0; i < SIZE; ++i) |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 255 | ints[i] = new Integer(SIZE - 1 - i); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 256 | ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 257 | assertFalse(q.addAll(Arrays.asList(empty))); |
| 258 | assertTrue(q.addAll(Arrays.asList(ints))); |
| 259 | for (int i = 0; i < SIZE; ++i) |
| 260 | assertEquals(i, q.pollFirst()); |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * pollFirst succeeds unless empty |
| 265 | */ |
| 266 | public void testPollFirst() { |
| 267 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 268 | for (int i = 0; i < SIZE; ++i) { |
| 269 | assertEquals(i, q.pollFirst()); |
| 270 | } |
| 271 | assertNull(q.pollFirst()); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * pollLast succeeds unless empty |
| 276 | */ |
| 277 | public void testPollLast() { |
| 278 | ConcurrentSkipListSet q = populatedSet(SIZE); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 279 | for (int i = SIZE - 1; i >= 0; --i) { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 280 | assertEquals(i, q.pollLast()); |
| 281 | } |
| 282 | assertNull(q.pollFirst()); |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * remove(x) removes x and returns true if present |
| 287 | */ |
| 288 | public void testRemoveElement() { |
| 289 | ConcurrentSkipListSet q = populatedSet(SIZE); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 290 | for (int i = 1; i < SIZE; i += 2) { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 291 | assertTrue(q.contains(i)); |
| 292 | assertTrue(q.remove(i)); |
| 293 | assertFalse(q.contains(i)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 294 | assertTrue(q.contains(i - 1)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 295 | } |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 296 | for (int i = 0; i < SIZE; i += 2) { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 297 | assertTrue(q.contains(i)); |
| 298 | assertTrue(q.remove(i)); |
| 299 | assertFalse(q.contains(i)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 300 | assertFalse(q.remove(i + 1)); |
| 301 | assertFalse(q.contains(i + 1)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 302 | } |
| 303 | assertTrue(q.isEmpty()); |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * contains(x) reports true when elements added but not yet removed |
| 308 | */ |
| 309 | public void testContains() { |
| 310 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 311 | for (int i = 0; i < SIZE; ++i) { |
| 312 | assertTrue(q.contains(new Integer(i))); |
| 313 | q.pollFirst(); |
| 314 | assertFalse(q.contains(new Integer(i))); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * clear removes all elements |
| 320 | */ |
| 321 | public void testClear() { |
| 322 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 323 | q.clear(); |
| 324 | assertTrue(q.isEmpty()); |
| 325 | assertEquals(0, q.size()); |
| 326 | q.add(new Integer(1)); |
| 327 | assertFalse(q.isEmpty()); |
| 328 | q.clear(); |
| 329 | assertTrue(q.isEmpty()); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * containsAll(c) is true when c contains a subset of elements |
| 334 | */ |
| 335 | public void testContainsAll() { |
| 336 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 337 | ConcurrentSkipListSet p = new ConcurrentSkipListSet(); |
| 338 | for (int i = 0; i < SIZE; ++i) { |
| 339 | assertTrue(q.containsAll(p)); |
| 340 | assertFalse(p.containsAll(q)); |
| 341 | p.add(new Integer(i)); |
| 342 | } |
| 343 | assertTrue(p.containsAll(q)); |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * retainAll(c) retains only those elements of c and reports true if changed |
| 348 | */ |
| 349 | public void testRetainAll() { |
| 350 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 351 | ConcurrentSkipListSet p = populatedSet(SIZE); |
| 352 | for (int i = 0; i < SIZE; ++i) { |
| 353 | boolean changed = q.retainAll(p); |
| 354 | if (i == 0) |
| 355 | assertFalse(changed); |
| 356 | else |
| 357 | assertTrue(changed); |
| 358 | |
| 359 | assertTrue(q.containsAll(p)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 360 | assertEquals(SIZE - i, q.size()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 361 | p.pollFirst(); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * removeAll(c) removes only those elements of c and reports true if changed |
| 367 | */ |
| 368 | public void testRemoveAll() { |
| 369 | for (int i = 1; i < SIZE; ++i) { |
| 370 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 371 | ConcurrentSkipListSet p = populatedSet(i); |
| 372 | assertTrue(q.removeAll(p)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 373 | assertEquals(SIZE - i, q.size()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 374 | for (int j = 0; j < i; ++j) { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 375 | Integer x = (Integer)(p.pollFirst()); |
| 376 | assertFalse(q.contains(x)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 377 | } |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * lower returns preceding element |
| 383 | */ |
| 384 | public void testLower() { |
| 385 | ConcurrentSkipListSet q = set5(); |
| 386 | Object e1 = q.lower(three); |
| 387 | assertEquals(two, e1); |
| 388 | |
| 389 | Object e2 = q.lower(six); |
| 390 | assertEquals(five, e2); |
| 391 | |
| 392 | Object e3 = q.lower(one); |
| 393 | assertNull(e3); |
| 394 | |
| 395 | Object e4 = q.lower(zero); |
| 396 | assertNull(e4); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * higher returns next element |
| 401 | */ |
| 402 | public void testHigher() { |
| 403 | ConcurrentSkipListSet q = set5(); |
| 404 | Object e1 = q.higher(three); |
| 405 | assertEquals(four, e1); |
| 406 | |
| 407 | Object e2 = q.higher(zero); |
| 408 | assertEquals(one, e2); |
| 409 | |
| 410 | Object e3 = q.higher(five); |
| 411 | assertNull(e3); |
| 412 | |
| 413 | Object e4 = q.higher(six); |
| 414 | assertNull(e4); |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * floor returns preceding element |
| 419 | */ |
| 420 | public void testFloor() { |
| 421 | ConcurrentSkipListSet q = set5(); |
| 422 | Object e1 = q.floor(three); |
| 423 | assertEquals(three, e1); |
| 424 | |
| 425 | Object e2 = q.floor(six); |
| 426 | assertEquals(five, e2); |
| 427 | |
| 428 | Object e3 = q.floor(one); |
| 429 | assertEquals(one, e3); |
| 430 | |
| 431 | Object e4 = q.floor(zero); |
| 432 | assertNull(e4); |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * ceiling returns next element |
| 437 | */ |
| 438 | public void testCeiling() { |
| 439 | ConcurrentSkipListSet q = set5(); |
| 440 | Object e1 = q.ceiling(three); |
| 441 | assertEquals(three, e1); |
| 442 | |
| 443 | Object e2 = q.ceiling(zero); |
| 444 | assertEquals(one, e2); |
| 445 | |
| 446 | Object e3 = q.ceiling(five); |
| 447 | assertEquals(five, e3); |
| 448 | |
| 449 | Object e4 = q.ceiling(six); |
| 450 | assertNull(e4); |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * toArray contains all elements in sorted order |
| 455 | */ |
| 456 | public void testToArray() { |
| 457 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 458 | Object[] o = q.toArray(); |
| 459 | for (int i = 0; i < o.length; i++) |
| 460 | assertSame(o[i], q.pollFirst()); |
| 461 | } |
| 462 | |
| 463 | /** |
| 464 | * toArray(a) contains all elements in sorted order |
| 465 | */ |
| 466 | public void testToArray2() { |
| 467 | ConcurrentSkipListSet<Integer> q = populatedSet(SIZE); |
| 468 | Integer[] ints = new Integer[SIZE]; |
| 469 | assertSame(ints, q.toArray(ints)); |
| 470 | for (int i = 0; i < ints.length; i++) |
| 471 | assertSame(ints[i], q.pollFirst()); |
| 472 | } |
| 473 | |
| 474 | /** |
| 475 | * iterator iterates through all elements |
| 476 | */ |
| 477 | public void testIterator() { |
| 478 | ConcurrentSkipListSet q = populatedSet(SIZE); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 479 | Iterator it = q.iterator(); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 480 | int i; |
| 481 | for (i = 0; it.hasNext(); i++) |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 482 | assertTrue(q.contains(it.next())); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 483 | assertEquals(i, SIZE); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 484 | assertIteratorExhausted(it); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | /** |
| 488 | * iterator of empty set has no elements |
| 489 | */ |
| 490 | public void testEmptyIterator() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 491 | NavigableSet s = new ConcurrentSkipListSet(); |
| 492 | assertIteratorExhausted(s.iterator()); |
| 493 | assertIteratorExhausted(s.descendingSet().iterator()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /** |
| 497 | * iterator.remove removes current element |
| 498 | */ |
| 499 | public void testIteratorRemove() { |
| 500 | final ConcurrentSkipListSet q = new ConcurrentSkipListSet(); |
| 501 | q.add(new Integer(2)); |
| 502 | q.add(new Integer(1)); |
| 503 | q.add(new Integer(3)); |
| 504 | |
| 505 | Iterator it = q.iterator(); |
| 506 | it.next(); |
| 507 | it.remove(); |
| 508 | |
| 509 | it = q.iterator(); |
| 510 | assertEquals(it.next(), new Integer(2)); |
| 511 | assertEquals(it.next(), new Integer(3)); |
| 512 | assertFalse(it.hasNext()); |
| 513 | } |
| 514 | |
| 515 | /** |
| 516 | * toString contains toStrings of elements |
| 517 | */ |
| 518 | public void testToString() { |
| 519 | ConcurrentSkipListSet q = populatedSet(SIZE); |
| 520 | String s = q.toString(); |
| 521 | for (int i = 0; i < SIZE; ++i) { |
| 522 | assertTrue(s.contains(String.valueOf(i))); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * A deserialized serialized set has same elements |
| 528 | */ |
| 529 | public void testSerialization() throws Exception { |
| 530 | NavigableSet x = populatedSet(SIZE); |
| 531 | NavigableSet y = serialClone(x); |
| 532 | |
| 533 | assertNotSame(x, y); |
| 534 | assertEquals(x.size(), y.size()); |
| 535 | assertEquals(x, y); |
| 536 | assertEquals(y, x); |
| 537 | while (!x.isEmpty()) { |
| 538 | assertFalse(y.isEmpty()); |
| 539 | assertEquals(x.pollFirst(), y.pollFirst()); |
| 540 | } |
| 541 | assertTrue(y.isEmpty()); |
| 542 | } |
| 543 | |
| 544 | /** |
| 545 | * subSet returns set with keys in requested range |
| 546 | */ |
| 547 | public void testSubSetContents() { |
| 548 | ConcurrentSkipListSet set = set5(); |
| 549 | SortedSet sm = set.subSet(two, four); |
| 550 | assertEquals(two, sm.first()); |
| 551 | assertEquals(three, sm.last()); |
| 552 | assertEquals(2, sm.size()); |
| 553 | assertFalse(sm.contains(one)); |
| 554 | assertTrue(sm.contains(two)); |
| 555 | assertTrue(sm.contains(three)); |
| 556 | assertFalse(sm.contains(four)); |
| 557 | assertFalse(sm.contains(five)); |
| 558 | Iterator i = sm.iterator(); |
| 559 | Object k; |
| 560 | k = (Integer)(i.next()); |
| 561 | assertEquals(two, k); |
| 562 | k = (Integer)(i.next()); |
| 563 | assertEquals(three, k); |
| 564 | assertFalse(i.hasNext()); |
| 565 | Iterator j = sm.iterator(); |
| 566 | j.next(); |
| 567 | j.remove(); |
| 568 | assertFalse(set.contains(two)); |
| 569 | assertEquals(4, set.size()); |
| 570 | assertEquals(1, sm.size()); |
| 571 | assertEquals(three, sm.first()); |
| 572 | assertEquals(three, sm.last()); |
| 573 | assertTrue(sm.remove(three)); |
| 574 | assertTrue(sm.isEmpty()); |
| 575 | assertEquals(3, set.size()); |
| 576 | } |
| 577 | |
| 578 | public void testSubSetContents2() { |
| 579 | ConcurrentSkipListSet set = set5(); |
| 580 | SortedSet sm = set.subSet(two, three); |
| 581 | assertEquals(1, sm.size()); |
| 582 | assertEquals(two, sm.first()); |
| 583 | assertEquals(two, sm.last()); |
| 584 | assertFalse(sm.contains(one)); |
| 585 | assertTrue(sm.contains(two)); |
| 586 | assertFalse(sm.contains(three)); |
| 587 | assertFalse(sm.contains(four)); |
| 588 | assertFalse(sm.contains(five)); |
| 589 | Iterator i = sm.iterator(); |
| 590 | Object k; |
| 591 | k = (Integer)(i.next()); |
| 592 | assertEquals(two, k); |
| 593 | assertFalse(i.hasNext()); |
| 594 | Iterator j = sm.iterator(); |
| 595 | j.next(); |
| 596 | j.remove(); |
| 597 | assertFalse(set.contains(two)); |
| 598 | assertEquals(4, set.size()); |
| 599 | assertEquals(0, sm.size()); |
| 600 | assertTrue(sm.isEmpty()); |
| 601 | assertFalse(sm.remove(three)); |
| 602 | assertEquals(4, set.size()); |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * headSet returns set with keys in requested range |
| 607 | */ |
| 608 | public void testHeadSetContents() { |
| 609 | ConcurrentSkipListSet set = set5(); |
| 610 | SortedSet sm = set.headSet(four); |
| 611 | assertTrue(sm.contains(one)); |
| 612 | assertTrue(sm.contains(two)); |
| 613 | assertTrue(sm.contains(three)); |
| 614 | assertFalse(sm.contains(four)); |
| 615 | assertFalse(sm.contains(five)); |
| 616 | Iterator i = sm.iterator(); |
| 617 | Object k; |
| 618 | k = (Integer)(i.next()); |
| 619 | assertEquals(one, k); |
| 620 | k = (Integer)(i.next()); |
| 621 | assertEquals(two, k); |
| 622 | k = (Integer)(i.next()); |
| 623 | assertEquals(three, k); |
| 624 | assertFalse(i.hasNext()); |
| 625 | sm.clear(); |
| 626 | assertTrue(sm.isEmpty()); |
| 627 | assertEquals(2, set.size()); |
| 628 | assertEquals(four, set.first()); |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * tailSet returns set with keys in requested range |
| 633 | */ |
| 634 | public void testTailSetContents() { |
| 635 | ConcurrentSkipListSet set = set5(); |
| 636 | SortedSet sm = set.tailSet(two); |
| 637 | assertFalse(sm.contains(one)); |
| 638 | assertTrue(sm.contains(two)); |
| 639 | assertTrue(sm.contains(three)); |
| 640 | assertTrue(sm.contains(four)); |
| 641 | assertTrue(sm.contains(five)); |
| 642 | Iterator i = sm.iterator(); |
| 643 | Object k; |
| 644 | k = (Integer)(i.next()); |
| 645 | assertEquals(two, k); |
| 646 | k = (Integer)(i.next()); |
| 647 | assertEquals(three, k); |
| 648 | k = (Integer)(i.next()); |
| 649 | assertEquals(four, k); |
| 650 | k = (Integer)(i.next()); |
| 651 | assertEquals(five, k); |
| 652 | assertFalse(i.hasNext()); |
| 653 | |
| 654 | SortedSet ssm = sm.tailSet(four); |
| 655 | assertEquals(four, ssm.first()); |
| 656 | assertEquals(five, ssm.last()); |
| 657 | assertTrue(ssm.remove(four)); |
| 658 | assertEquals(1, ssm.size()); |
| 659 | assertEquals(3, sm.size()); |
| 660 | assertEquals(4, set.size()); |
| 661 | } |
| 662 | |
| 663 | Random rnd = new Random(666); |
| 664 | |
| 665 | /** |
| 666 | * Subsets of subsets subdivide correctly |
| 667 | */ |
| 668 | public void testRecursiveSubSets() throws Exception { |
| 669 | int setSize = expensiveTests ? 1000 : 100; |
| 670 | Class cl = ConcurrentSkipListSet.class; |
| 671 | |
| 672 | NavigableSet<Integer> set = newSet(cl); |
| 673 | BitSet bs = new BitSet(setSize); |
| 674 | |
| 675 | populate(set, setSize, bs); |
| 676 | check(set, 0, setSize - 1, true, bs); |
| 677 | check(set.descendingSet(), 0, setSize - 1, false, bs); |
| 678 | |
| 679 | mutateSet(set, 0, setSize - 1, bs); |
| 680 | check(set, 0, setSize - 1, true, bs); |
| 681 | check(set.descendingSet(), 0, setSize - 1, false, bs); |
| 682 | |
| 683 | bashSubSet(set.subSet(0, true, setSize, false), |
| 684 | 0, setSize - 1, true, bs); |
| 685 | } |
| 686 | |
| 687 | /** |
| 688 | * addAll is idempotent |
| 689 | */ |
| 690 | public void testAddAll_idempotent() throws Exception { |
| 691 | Set x = populatedSet(SIZE); |
| 692 | Set y = new ConcurrentSkipListSet(x); |
| 693 | y.addAll(x); |
| 694 | assertEquals(x, y); |
| 695 | assertEquals(y, x); |
| 696 | } |
| 697 | |
| 698 | static NavigableSet<Integer> newSet(Class cl) throws Exception { |
| 699 | NavigableSet<Integer> result = (NavigableSet<Integer>) cl.newInstance(); |
| 700 | assertEquals(0, result.size()); |
| 701 | assertFalse(result.iterator().hasNext()); |
| 702 | return result; |
| 703 | } |
| 704 | |
| 705 | void populate(NavigableSet<Integer> set, int limit, BitSet bs) { |
| 706 | for (int i = 0, n = 2 * limit / 3; i < n; i++) { |
| 707 | int element = rnd.nextInt(limit); |
| 708 | put(set, element, bs); |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | void mutateSet(NavigableSet<Integer> set, int min, int max, BitSet bs) { |
| 713 | int size = set.size(); |
| 714 | int rangeSize = max - min + 1; |
| 715 | |
| 716 | // Remove a bunch of entries directly |
| 717 | for (int i = 0, n = rangeSize / 2; i < n; i++) { |
| 718 | remove(set, min - 5 + rnd.nextInt(rangeSize + 10), bs); |
| 719 | } |
| 720 | |
| 721 | // Remove a bunch of entries with iterator |
| 722 | for (Iterator<Integer> it = set.iterator(); it.hasNext(); ) { |
| 723 | if (rnd.nextBoolean()) { |
| 724 | bs.clear(it.next()); |
| 725 | it.remove(); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | // Add entries till we're back to original size |
| 730 | while (set.size() < size) { |
| 731 | int element = min + rnd.nextInt(rangeSize); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 732 | assertTrue(element >= min && element <= max); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 733 | put(set, element, bs); |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | void mutateSubSet(NavigableSet<Integer> set, int min, int max, |
| 738 | BitSet bs) { |
| 739 | int size = set.size(); |
| 740 | int rangeSize = max - min + 1; |
| 741 | |
| 742 | // Remove a bunch of entries directly |
| 743 | for (int i = 0, n = rangeSize / 2; i < n; i++) { |
| 744 | remove(set, min - 5 + rnd.nextInt(rangeSize + 10), bs); |
| 745 | } |
| 746 | |
| 747 | // Remove a bunch of entries with iterator |
| 748 | for (Iterator<Integer> it = set.iterator(); it.hasNext(); ) { |
| 749 | if (rnd.nextBoolean()) { |
| 750 | bs.clear(it.next()); |
| 751 | it.remove(); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | // Add entries till we're back to original size |
| 756 | while (set.size() < size) { |
| 757 | int element = min - 5 + rnd.nextInt(rangeSize + 10); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 758 | if (element >= min && element <= max) { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 759 | put(set, element, bs); |
| 760 | } else { |
| 761 | try { |
| 762 | set.add(element); |
| 763 | shouldThrow(); |
| 764 | } catch (IllegalArgumentException success) {} |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | void put(NavigableSet<Integer> set, int element, BitSet bs) { |
| 770 | if (set.add(element)) |
| 771 | bs.set(element); |
| 772 | } |
| 773 | |
| 774 | void remove(NavigableSet<Integer> set, int element, BitSet bs) { |
| 775 | if (set.remove(element)) |
| 776 | bs.clear(element); |
| 777 | } |
| 778 | |
| 779 | void bashSubSet(NavigableSet<Integer> set, |
| 780 | int min, int max, boolean ascending, |
| 781 | BitSet bs) { |
| 782 | check(set, min, max, ascending, bs); |
| 783 | check(set.descendingSet(), min, max, !ascending, bs); |
| 784 | |
| 785 | mutateSubSet(set, min, max, bs); |
| 786 | check(set, min, max, ascending, bs); |
| 787 | check(set.descendingSet(), min, max, !ascending, bs); |
| 788 | |
| 789 | // Recurse |
| 790 | if (max - min < 2) |
| 791 | return; |
| 792 | int midPoint = (min + max) / 2; |
| 793 | |
| 794 | // headSet - pick direction and endpoint inclusion randomly |
| 795 | boolean incl = rnd.nextBoolean(); |
| 796 | NavigableSet<Integer> hm = set.headSet(midPoint, incl); |
| 797 | if (ascending) { |
| 798 | if (rnd.nextBoolean()) |
| 799 | bashSubSet(hm, min, midPoint - (incl ? 0 : 1), true, bs); |
| 800 | else |
| 801 | bashSubSet(hm.descendingSet(), min, midPoint - (incl ? 0 : 1), |
| 802 | false, bs); |
| 803 | } else { |
| 804 | if (rnd.nextBoolean()) |
| 805 | bashSubSet(hm, midPoint + (incl ? 0 : 1), max, false, bs); |
| 806 | else |
| 807 | bashSubSet(hm.descendingSet(), midPoint + (incl ? 0 : 1), max, |
| 808 | true, bs); |
| 809 | } |
| 810 | |
| 811 | // tailSet - pick direction and endpoint inclusion randomly |
| 812 | incl = rnd.nextBoolean(); |
| 813 | NavigableSet<Integer> tm = set.tailSet(midPoint,incl); |
| 814 | if (ascending) { |
| 815 | if (rnd.nextBoolean()) |
| 816 | bashSubSet(tm, midPoint + (incl ? 0 : 1), max, true, bs); |
| 817 | else |
| 818 | bashSubSet(tm.descendingSet(), midPoint + (incl ? 0 : 1), max, |
| 819 | false, bs); |
| 820 | } else { |
| 821 | if (rnd.nextBoolean()) { |
| 822 | bashSubSet(tm, min, midPoint - (incl ? 0 : 1), false, bs); |
| 823 | } else { |
| 824 | bashSubSet(tm.descendingSet(), min, midPoint - (incl ? 0 : 1), |
| 825 | true, bs); |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | // subSet - pick direction and endpoint inclusion randomly |
| 830 | int rangeSize = max - min + 1; |
| 831 | int[] endpoints = new int[2]; |
| 832 | endpoints[0] = min + rnd.nextInt(rangeSize); |
| 833 | endpoints[1] = min + rnd.nextInt(rangeSize); |
| 834 | Arrays.sort(endpoints); |
| 835 | boolean lowIncl = rnd.nextBoolean(); |
| 836 | boolean highIncl = rnd.nextBoolean(); |
| 837 | if (ascending) { |
| 838 | NavigableSet<Integer> sm = set.subSet( |
| 839 | endpoints[0], lowIncl, endpoints[1], highIncl); |
| 840 | if (rnd.nextBoolean()) |
| 841 | bashSubSet(sm, endpoints[0] + (lowIncl ? 0 : 1), |
| 842 | endpoints[1] - (highIncl ? 0 : 1), true, bs); |
| 843 | else |
| 844 | bashSubSet(sm.descendingSet(), endpoints[0] + (lowIncl ? 0 : 1), |
| 845 | endpoints[1] - (highIncl ? 0 : 1), false, bs); |
| 846 | } else { |
| 847 | NavigableSet<Integer> sm = set.subSet( |
| 848 | endpoints[1], highIncl, endpoints[0], lowIncl); |
| 849 | if (rnd.nextBoolean()) |
| 850 | bashSubSet(sm, endpoints[0] + (lowIncl ? 0 : 1), |
| 851 | endpoints[1] - (highIncl ? 0 : 1), false, bs); |
| 852 | else |
| 853 | bashSubSet(sm.descendingSet(), endpoints[0] + (lowIncl ? 0 : 1), |
| 854 | endpoints[1] - (highIncl ? 0 : 1), true, bs); |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | /** |
| 859 | * min and max are both inclusive. If max < min, interval is empty. |
| 860 | */ |
| 861 | void check(NavigableSet<Integer> set, |
| 862 | final int min, final int max, final boolean ascending, |
| 863 | final BitSet bs) { |
| 864 | class ReferenceSet { |
| 865 | int lower(int element) { |
| 866 | return ascending ? |
| 867 | lowerAscending(element) : higherAscending(element); |
| 868 | } |
| 869 | int floor(int element) { |
| 870 | return ascending ? |
| 871 | floorAscending(element) : ceilingAscending(element); |
| 872 | } |
| 873 | int ceiling(int element) { |
| 874 | return ascending ? |
| 875 | ceilingAscending(element) : floorAscending(element); |
| 876 | } |
| 877 | int higher(int element) { |
| 878 | return ascending ? |
| 879 | higherAscending(element) : lowerAscending(element); |
| 880 | } |
| 881 | int first() { |
| 882 | return ascending ? firstAscending() : lastAscending(); |
| 883 | } |
| 884 | int last() { |
| 885 | return ascending ? lastAscending() : firstAscending(); |
| 886 | } |
| 887 | int lowerAscending(int element) { |
| 888 | return floorAscending(element - 1); |
| 889 | } |
| 890 | int floorAscending(int element) { |
| 891 | if (element < min) |
| 892 | return -1; |
| 893 | else if (element > max) |
| 894 | element = max; |
| 895 | |
| 896 | // BitSet should support this! Test would run much faster |
| 897 | while (element >= min) { |
| 898 | if (bs.get(element)) |
| 899 | return element; |
| 900 | element--; |
| 901 | } |
| 902 | return -1; |
| 903 | } |
| 904 | int ceilingAscending(int element) { |
| 905 | if (element < min) |
| 906 | element = min; |
| 907 | else if (element > max) |
| 908 | return -1; |
| 909 | int result = bs.nextSetBit(element); |
| 910 | return result > max ? -1 : result; |
| 911 | } |
| 912 | int higherAscending(int element) { |
| 913 | return ceilingAscending(element + 1); |
| 914 | } |
| 915 | private int firstAscending() { |
| 916 | int result = ceilingAscending(min); |
| 917 | return result > max ? -1 : result; |
| 918 | } |
| 919 | private int lastAscending() { |
| 920 | int result = floorAscending(max); |
| 921 | return result < min ? -1 : result; |
| 922 | } |
| 923 | } |
| 924 | ReferenceSet rs = new ReferenceSet(); |
| 925 | |
| 926 | // Test contents using containsElement |
| 927 | int size = 0; |
| 928 | for (int i = min; i <= max; i++) { |
| 929 | boolean bsContainsI = bs.get(i); |
| 930 | assertEquals(bsContainsI, set.contains(i)); |
| 931 | if (bsContainsI) |
| 932 | size++; |
| 933 | } |
| 934 | assertEquals(size, set.size()); |
| 935 | |
| 936 | // Test contents using contains elementSet iterator |
| 937 | int size2 = 0; |
| 938 | int previousElement = -1; |
| 939 | for (int element : set) { |
| 940 | assertTrue(bs.get(element)); |
| 941 | size2++; |
| 942 | assertTrue(previousElement < 0 || (ascending ? |
| 943 | element - previousElement > 0 : element - previousElement < 0)); |
| 944 | previousElement = element; |
| 945 | } |
| 946 | assertEquals(size2, size); |
| 947 | |
| 948 | // Test navigation ops |
| 949 | for (int element = min - 1; element <= max + 1; element++) { |
| 950 | assertEq(set.lower(element), rs.lower(element)); |
| 951 | assertEq(set.floor(element), rs.floor(element)); |
| 952 | assertEq(set.higher(element), rs.higher(element)); |
| 953 | assertEq(set.ceiling(element), rs.ceiling(element)); |
| 954 | } |
| 955 | |
| 956 | // Test extrema |
| 957 | if (set.size() != 0) { |
| 958 | assertEq(set.first(), rs.first()); |
| 959 | assertEq(set.last(), rs.last()); |
| 960 | } else { |
| 961 | assertEq(rs.first(), -1); |
| 962 | assertEq(rs.last(), -1); |
| 963 | try { |
| 964 | set.first(); |
| 965 | shouldThrow(); |
| 966 | } catch (NoSuchElementException success) {} |
| 967 | try { |
| 968 | set.last(); |
| 969 | shouldThrow(); |
| 970 | } catch (NoSuchElementException success) {} |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | static void assertEq(Integer i, int j) { |
| 975 | if (i == null) |
| 976 | assertEquals(j, -1); |
| 977 | else |
| 978 | assertEquals((int) i, j); |
| 979 | } |
| 980 | |
| 981 | static boolean eq(Integer i, int j) { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 982 | return (i == null) ? j == -1 : i == j; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 983 | } |
| 984 | |
| 985 | } |