1 /*
2 * Copyright (c) 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 import java.util.ArrayList;
25 import java.util.Arrays;
26 import java.util.Collections;
27 import java.util.Comparator;
28 import java.util.List;
29 import java.util.LinkedList;
30 import java.util.Stack;
31 import java.util.Vector;
32 import java.util.concurrent.CopyOnWriteArrayList;
33 import java.util.concurrent.atomic.AtomicBoolean;
34 import java.util.concurrent.atomic.AtomicInteger;
35
36 import org.testng.annotations.DataProvider;
37 import org.testng.annotations.Test;
38
39 import static org.testng.Assert.assertEquals;
40 import static org.testng.Assert.assertFalse;
41 import static org.testng.Assert.assertTrue;
42 import static org.testng.Assert.fail;
43
44 import java.lang.reflect.Constructor;
45 import java.util.ConcurrentModificationException;
46 import java.util.function.Predicate;
47 import java.util.function.Supplier;
48
49 /**
50 * @test
51 * @summary Unit tests for extension methods on List
52 * @bug 8023367
53 * @library ../Collection/testlibrary
54 * @build CollectionAsserts CollectionSupplier ExtendsAbstractList
55 * @run testng ListDefaults
56 */
57 public class ListDefaults {
58
59 private static final Supplier<?>[] LIST_CLASSES = {
60 java.util.ArrayList::new,
61 java.util.LinkedList::new,
62 java.util.Vector::new,
63 java.util.concurrent.CopyOnWriteArrayList::new,
64 ExtendsAbstractList::new
65 };
66
67 private static final Supplier<?>[] LIST_CME_CLASSES = {
68 java.util.ArrayList::new,
69 java.util.Vector::new
70 };
71
72 private static final Predicate<Integer> pEven = x -> 0 == x % 2;
73 private static final Predicate<Integer> pOdd = x -> 1 == x % 2;
74
75 private static final Comparator<Integer> BIT_COUNT_COMPARATOR =
76 (x, y) -> Integer.bitCount(x) - Integer.bitCount(y);
77
78 private static final Comparator<AtomicInteger> ATOMIC_INTEGER_COMPARATOR =
79 (x, y) -> x.intValue() - y.intValue();
80
81 private static final int SIZE = 100;
82 private static final int SUBLIST_FROM = 20;
83 private static final int SUBLIST_TO = SIZE - 5;
84 private static final int SUBLIST_SIZE = SUBLIST_TO - SUBLIST_FROM;
85
86 private static interface Callback {
87 void call(List<Integer> list);
88 }
89
90 // call the callback for each recursive subList
91 private void trimmedSubList(final List<Integer> list, final Callback callback) {
92 int size = list.size();
93 if (size > 1) {
94 // trim 1 element from both ends
95 final List<Integer> subList = list.subList(1, size - 1);
96 callback.call(subList);
97 trimmedSubList(subList, callback);
98 }
99 }
100
101 @DataProvider(name="listProvider", parallel=true)
102 public static Object[][] listCases() {
103 final List<Object[]> cases = new LinkedList<>();
104 cases.add(new Object[] { Collections.emptyList() });
105 cases.add(new Object[] { new ArrayList<>() });
106 cases.add(new Object[] { new LinkedList<>() });
107 cases.add(new Object[] { new Vector<>() });
108 cases.add(new Object[] { new Stack<>() });
109 cases.add(new Object[] { new CopyOnWriteArrayList<>() });
110
111 cases.add(new Object[] { new ArrayList(){{add(42);}} });
112 cases.add(new Object[] { new LinkedList(){{add(42);}} });
113 cases.add(new Object[] { new Vector(){{add(42);}} });
114 cases.add(new Object[] { new Stack(){{add(42);}} });
115 cases.add(new Object[] { new CopyOnWriteArrayList(){{add(42);}} });
116 return cases.toArray(new Object[0][cases.size()]);
117 }
118
119 @Test(dataProvider = "listProvider")
120 public void testProvidedWithNull(final List<Integer> list) throws Exception {
121 try {
122 list.forEach(null);
123 fail("expected NPE not thrown");
124 } catch (NullPointerException npe) {}
125 try {
126 list.replaceAll(null);
127 fail("expected NPE not thrown");
128 } catch (NullPointerException npe) {}
129 try {
130 list.removeIf(null);
131 fail("expected NPE not thrown");
132 } catch (NullPointerException npe) {}
133 try {
134 list.sort(null);
135 } catch (Throwable t) {
136 fail("Exception not expected: " + t);
137 }
138 }
139
140 @Test
141 public void testForEach() throws Exception {
142 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CLASSES, SIZE);
143 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
144 final List<Integer> original = ((List<Integer>) test.expected);
145 final List<Integer> list = ((List<Integer>) test.collection);
146
147 try {
148 list.forEach(null);
149 fail("expected NPE not thrown");
150 } catch (NullPointerException npe) {}
151 CollectionAsserts.assertContents(list, original);
152
153 final List<Integer> actual = new LinkedList<>();
154 list.forEach(actual::add);
155 CollectionAsserts.assertContents(actual, list);
156 CollectionAsserts.assertContents(actual, original);
157
158 if (original.size() > SUBLIST_SIZE) {
159 final List<Integer> subList = original.subList(SUBLIST_FROM, SUBLIST_TO);
160 final List<Integer> actualSubList = new LinkedList<>();
161 subList.forEach(actualSubList::add);
162 assertEquals(actualSubList.size(), SUBLIST_SIZE);
163 for (int i = 0; i < SUBLIST_SIZE; i++) {
164 assertEquals(actualSubList.get(i), original.get(i + SUBLIST_FROM));
165 }
166 }
167
168 trimmedSubList(list, new Callback() {
169 @Override
170 public void call(final List<Integer> list) {
171 final List<Integer> actual = new LinkedList<>();
172 list.forEach(actual::add);
173 CollectionAsserts.assertContents(actual, list);
174 }
175 });
176 }
177 }
178
179 @Test
180 public void testRemoveIf() throws Exception {
181 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CLASSES, SIZE);
182 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
183 final List<Integer> original = ((List<Integer>) test.expected);
184 final List<Integer> list = ((List<Integer>) test.collection);
185
186 try {
187 list.removeIf(null);
188 fail("expected NPE not thrown");
189 } catch (NullPointerException npe) {}
190 CollectionAsserts.assertContents(list, original);
191
192 final AtomicInteger offset = new AtomicInteger(1);
193 while (list.size() > 0) {
194 removeFirst(original, list, offset);
195 }
196 }
197
198 for (final CollectionSupplier.TestCase test : supplier.get()) {
199 final List<Integer> original = ((List<Integer>) test.expected);
200 final List<Integer> list = ((List<Integer>) test.collection);
201 list.removeIf(pOdd);
202 for (int i : list) {
203 assertTrue((i % 2) == 0);
204 }
205 for (int i : original) {
206 if (i % 2 == 0) {
207 assertTrue(list.contains(i));
208 }
209 }
210 list.removeIf(pEven);
211 assertTrue(list.isEmpty());
212 }
213
214 for (final CollectionSupplier.TestCase test : supplier.get()) {
215 final List<Integer> original = ((List<Integer>) test.expected);
216 final List<Integer> list = ((List<Integer>) test.collection);
217 final List<Integer> listCopy = new ArrayList<>(list);
218 if (original.size() > SUBLIST_SIZE) {
219 final List<Integer> subList = list.subList(SUBLIST_FROM, SUBLIST_TO);
220 final List<Integer> subListCopy = new ArrayList<>(subList);
221 listCopy.removeAll(subList);
222 subList.removeIf(pOdd);
223 for (int i : subList) {
224 assertTrue((i % 2) == 0);
225 }
226 for (int i : subListCopy) {
227 if (i % 2 == 0) {
228 assertTrue(subList.contains(i));
229 } else {
230 assertFalse(subList.contains(i));
231 }
232 }
233 subList.removeIf(pEven);
234 assertTrue(subList.isEmpty());
235 // elements outside the view should remain
236 CollectionAsserts.assertContents(list, listCopy);
237 }
238 }
239
240 for (final CollectionSupplier.TestCase test : supplier.get()) {
241 final List<Integer> list = ((List<Integer>) test.collection);
242 trimmedSubList(list, new Callback() {
243 @Override
244 public void call(final List<Integer> list) {
245 final List<Integer> copy = new ArrayList<>(list);
246 list.removeIf(pOdd);
247 for (int i : list) {
248 assertTrue((i % 2) == 0);
249 }
250 for (int i : copy) {
251 if (i % 2 == 0) {
252 assertTrue(list.contains(i));
253 } else {
254 assertFalse(list.contains(i));
255 }
256 }
257 }
258 });
259 }
260 }
261
262 // remove the first element
263 private void removeFirst(final List<Integer> original, final List<Integer> list, final AtomicInteger offset) {
264 final AtomicBoolean first = new AtomicBoolean(true);
265 list.removeIf(x -> first.getAndSet(false));
266 CollectionAsserts.assertContents(original.subList(offset.getAndIncrement(), original.size()), list);
267 }
268
269 @Test
270 public void testReplaceAll() throws Exception {
271 final int scale = 3;
272 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CLASSES, SIZE);
273 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
274 final List<Integer> original = ((List<Integer>) test.expected);
275 final List<Integer> list = ((List<Integer>) test.collection);
276
277 try {
278 list.replaceAll(null);
279 fail("expected NPE not thrown");
280 } catch (NullPointerException npe) {}
281 CollectionAsserts.assertContents(list, original);
282
283 list.replaceAll(x -> scale * x);
284 for (int i=0; i < original.size(); i++) {
285 assertTrue(list.get(i) == (scale * original.get(i)), "mismatch at index " + i);
286 }
287
288 if (original.size() > SUBLIST_SIZE) {
289 final List<Integer> subList = list.subList(SUBLIST_FROM, SUBLIST_TO);
290 subList.replaceAll(x -> x + 1);
291 // verify elements in view [from, to) were replaced
292 for (int i = 0; i < SUBLIST_SIZE; i++) {
293 assertTrue(subList.get(i) == ((scale * original.get(i + SUBLIST_FROM)) + 1),
294 "mismatch at sublist index " + i);
295 }
296 // verify that elements [0, from) remain unmodified
297 for (int i = 0; i < SUBLIST_FROM; i++) {
298 assertTrue(list.get(i) == (scale * original.get(i)),
299 "mismatch at original index " + i);
300 }
301 // verify that elements [to, size) remain unmodified
302 for (int i = SUBLIST_TO; i < list.size(); i++) {
303 assertTrue(list.get(i) == (scale * original.get(i)),
304 "mismatch at original index " + i);
305 }
306 }
307 }
308
309 for (final CollectionSupplier.TestCase test : supplier.get()) {
310 final List<Integer> list = ((List<Integer>) test.collection);
311 trimmedSubList(list, new Callback() {
312 @Override
313 public void call(final List<Integer> list) {
314 final List<Integer> copy = new ArrayList<>(list);
315 final int offset = 5;
316 list.replaceAll(x -> offset + x);
317 for (int i=0; i < copy.size(); i++) {
318 assertTrue(list.get(i) == (offset + copy.get(i)), "mismatch at index " + i);
319 }
320 }
321 });
322 }
323 }
324
325 @Test
326 public void testSort() throws Exception {
327 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CLASSES, SIZE);
328 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
329 final List<Integer> original = ((List<Integer>) test.expected);
330 final List<Integer> list = ((List<Integer>) test.collection);
331 CollectionSupplier.shuffle(list);
332 list.sort(Integer::compare);
333 CollectionAsserts.assertSorted(list, Integer::compare);
334 if (test.name.startsWith("reverse")) {
335 Collections.reverse(list);
336 }
337 CollectionAsserts.assertContents(list, original);
338
339 CollectionSupplier.shuffle(list);
340 list.sort(null);
341 CollectionAsserts.assertSorted(list, Comparator.<Integer>naturalOrder());
342 if (test.name.startsWith("reverse")) {
343 Collections.reverse(list);
344 }
345 CollectionAsserts.assertContents(list, original);
346
347 CollectionSupplier.shuffle(list);
348 list.sort(Comparator.<Integer>naturalOrder());
349 CollectionAsserts.assertSorted(list, Comparator.<Integer>naturalOrder());
350 if (test.name.startsWith("reverse")) {
351 Collections.reverse(list);
352 }
353 CollectionAsserts.assertContents(list, original);
354
355 CollectionSupplier.shuffle(list);
356 list.sort(Comparator.<Integer>reverseOrder());
357 CollectionAsserts.assertSorted(list, Comparator.<Integer>reverseOrder());
358 if (!test.name.startsWith("reverse")) {
359 Collections.reverse(list);
360 }
361 CollectionAsserts.assertContents(list, original);
362
363 CollectionSupplier.shuffle(list);
364 list.sort(BIT_COUNT_COMPARATOR);
365 CollectionAsserts.assertSorted(list, BIT_COUNT_COMPARATOR);
366 // check sort by verifying that bitCount increases and never drops
367 int minBitCount = 0;
368 int bitCount = 0;
369 for (final Integer i : list) {
370 bitCount = Integer.bitCount(i);
371 assertTrue(bitCount >= minBitCount);
372 minBitCount = bitCount;
373 }
374
375 @SuppressWarnings("unchecked")
376 final Constructor<? extends List<?>> defaultConstructor = ((Class<? extends List<?>>)test.collection.getClass()).getConstructor();
377 final List<AtomicInteger> incomparables = (List<AtomicInteger>) defaultConstructor.newInstance();
378
379 for (int i=0; i < test.expected.size(); i++) {
380 incomparables.add(new AtomicInteger(i));
381 }
382 CollectionSupplier.shuffle(incomparables);
383 incomparables.sort(ATOMIC_INTEGER_COMPARATOR);
384 for (int i=0; i < test.expected.size(); i++) {
385 assertEquals(i, incomparables.get(i).intValue());
386 }
387
388 if (original.size() > SUBLIST_SIZE) {
389 final List<Integer> copy = new ArrayList<>(list);
390 final List<Integer> subList = list.subList(SUBLIST_FROM, SUBLIST_TO);
391 CollectionSupplier.shuffle(subList);
392 subList.sort(Comparator.<Integer>naturalOrder());
393 CollectionAsserts.assertSorted(subList, Comparator.<Integer>naturalOrder());
394 // verify that elements [0, from) remain unmodified
395 for (int i = 0; i < SUBLIST_FROM; i++) {
396 assertTrue(list.get(i) == copy.get(i),
397 "mismatch at index " + i);
398 }
399 // verify that elements [to, size) remain unmodified
400 for (int i = SUBLIST_TO; i < list.size(); i++) {
401 assertTrue(list.get(i) == copy.get(i),
402 "mismatch at index " + i);
403 }
404 }
405 }
406
407 for (final CollectionSupplier.TestCase test : supplier.get()) {
408 final List<Integer> list = ((List<Integer>) test.collection);
409 trimmedSubList(list, new Callback() {
410 @Override
411 public void call(final List<Integer> list) {
412 final List<Integer> copy = new ArrayList<>(list);
413 CollectionSupplier.shuffle(list);
414 list.sort(Comparator.<Integer>naturalOrder());
415 CollectionAsserts.assertSorted(list, Comparator.<Integer>naturalOrder());
416 }
417 });
418 }
419 }
420
421 @Test
422 public void testForEachThrowsCME() throws Exception {
423 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CME_CLASSES, SIZE);
424 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
425 final List<Integer> list = ((List<Integer>) test.collection);
426
427 if (list.size() <= 1) {
428 continue;
429 }
430 boolean gotException = false;
431 try {
432 // bad predicate that modifies its list, should throw CME
433 list.forEach((x) -> {list.add(x);});
434 } catch (ConcurrentModificationException cme) {
435 gotException = true;
436 }
437 if (!gotException) {
438 fail("expected CME was not thrown from " + test);
439 }
440 }
441 }
442
443 @Test
444 public void testRemoveIfThrowsCME() throws Exception {
445 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CME_CLASSES, SIZE);
446 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
447 final List<Integer> original = ((List<Integer>) test.expected);
448 final List<Integer> list = ((List<Integer>) test.collection);
449
450 if (list.size() <= 1) {
451 continue;
452 }
453 boolean gotException = false;
454 try {
455 // bad predicate that modifies its list, should throw CME
456 list.removeIf((x) -> {return list.add(x);});
457 } catch (ConcurrentModificationException cme) {
458 gotException = true;
459 }
460 if (!gotException) {
461 fail("expected CME was not thrown from " + test);
462 }
463 }
464 }
465
466 @Test
467 public void testReplaceAllThrowsCME() throws Exception {
468 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CME_CLASSES, SIZE);
469 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
470 final List<Integer> list = ((List<Integer>) test.collection);
471
472 if (list.size() <= 1) {
473 continue;
474 }
475 boolean gotException = false;
476 try {
477 // bad predicate that modifies its list, should throw CME
478 list.replaceAll(x -> {int n = 3 * x; list.add(n); return n;});
479 } catch (ConcurrentModificationException cme) {
480 gotException = true;
481 }
482 if (!gotException) {
483 fail("expected CME was not thrown from " + test);
484 }
485 }
486 }
487
488 @Test
489 public void testSortThrowsCME() throws Exception {
490 final CollectionSupplier<List<Integer>> supplier = new CollectionSupplier((Supplier<List<Integer>>[])LIST_CME_CLASSES, SIZE);
491 for (final CollectionSupplier.TestCase<List<Integer>> test : supplier.get()) {
492 final List<Integer> list = ((List<Integer>) test.collection);
493
494 if (list.size() <= 1) {
495 continue;
496 }
497 boolean gotException = false;
498 try {
499 // bad predicate that modifies its list, should throw CME
500 list.sort((x, y) -> {list.add(x); return x - y;});
501 } catch (ConcurrentModificationException cme) {
502 gotException = true;
503 }
504 if (!gotException) {
505 fail("expected CME was not thrown from " + test);
506 }
507 }
508 }
509
510 private static final List<Integer> SLICED_EXPECTED = Arrays.asList(0, 1, 2, 3, 5, 6, 7, 8, 9);
511 private static final List<Integer> SLICED_EXPECTED2 = Arrays.asList(0, 1, 2, 5, 6, 7, 8, 9);
512
513 @DataProvider(name="shortIntListProvider", parallel=true)
514 public static Object[][] intListCases() {
515 final Integer[] DATA = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
516 final List<Object[]> cases = new LinkedList<>();
517 cases.add(new Object[] { new ArrayList<>(Arrays.asList(DATA)) });
518 cases.add(new Object[] { new LinkedList<>(Arrays.asList(DATA)) });
519 cases.add(new Object[] { new Vector<>(Arrays.asList(DATA)) });
520 cases.add(new Object[] { new CopyOnWriteArrayList<>(Arrays.asList(DATA)) });
521 cases.add(new Object[] { new ExtendsAbstractList<>(Arrays.asList(DATA)) });
522 return cases.toArray(new Object[0][cases.size()]);
523 }
524
525 @Test(dataProvider = "shortIntListProvider")
526 public void testRemoveIfFromSlice(final List<Integer> list) throws Exception {
527 final List<Integer> sublist = list.subList(3, 6);
528 assertTrue(sublist.removeIf(x -> x == 4));
529 CollectionAsserts.assertContents(list, SLICED_EXPECTED);
530
531 final List<Integer> sublist2 = list.subList(2, 5);
532 assertTrue(sublist2.removeIf(x -> x == 3));
533 CollectionAsserts.assertContents(list, SLICED_EXPECTED2);
534 }
535 }