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 |
import java.util.ArrayDeque; |
8 |
import java.util.Arrays; |
9 |
import java.util.Collection; |
10 |
import java.util.Deque; |
11 |
import java.util.Iterator; |
12 |
import java.util.NoSuchElementException; |
13 |
import java.util.Queue; |
14 |
import java.util.Random; |
15 |
|
16 |
import junit.framework.Test; |
17 |
import junit.framework.TestSuite; |
18 |
|
19 |
public class ArrayDequeTest extends JSR166TestCase { |
20 |
public static void main(String[] args) { |
21 |
main(suite(), args); |
22 |
} |
23 |
|
24 |
public static Test suite() { |
25 |
return new TestSuite(ArrayDequeTest.class); |
26 |
} |
27 |
|
28 |
/** |
29 |
* Returns a new deque of given size containing consecutive |
30 |
* Integers 0 ... n. |
31 |
*/ |
32 |
private ArrayDeque<Integer> populatedDeque(int n) { |
33 |
ArrayDeque<Integer> q = new ArrayDeque<Integer>(); |
34 |
assertTrue(q.isEmpty()); |
35 |
for (int i = 0; i < n; ++i) |
36 |
assertTrue(q.offerLast(new Integer(i))); |
37 |
assertFalse(q.isEmpty()); |
38 |
assertEquals(n, q.size()); |
39 |
return q; |
40 |
} |
41 |
|
42 |
/** |
43 |
* new deque is empty |
44 |
*/ |
45 |
public void testConstructor1() { |
46 |
assertEquals(0, new ArrayDeque().size()); |
47 |
} |
48 |
|
49 |
/** |
50 |
* Initializing from null Collection throws NPE |
51 |
*/ |
52 |
public void testConstructor3() { |
53 |
try { |
54 |
new ArrayDeque((Collection)null); |
55 |
shouldThrow(); |
56 |
} catch (NullPointerException success) {} |
57 |
} |
58 |
|
59 |
/** |
60 |
* Initializing from Collection of null elements throws NPE |
61 |
*/ |
62 |
public void testConstructor4() { |
63 |
try { |
64 |
new ArrayDeque(Arrays.asList(new Integer[SIZE])); |
65 |
shouldThrow(); |
66 |
} catch (NullPointerException success) {} |
67 |
} |
68 |
|
69 |
/** |
70 |
* Initializing from Collection with some null elements throws NPE |
71 |
*/ |
72 |
public void testConstructor5() { |
73 |
Integer[] ints = new Integer[SIZE]; |
74 |
for (int i = 0; i < SIZE - 1; ++i) |
75 |
ints[i] = new Integer(i); |
76 |
try { |
77 |
new ArrayDeque(Arrays.asList(ints)); |
78 |
shouldThrow(); |
79 |
} catch (NullPointerException success) {} |
80 |
} |
81 |
|
82 |
/** |
83 |
* Deque contains all elements of collection used to initialize |
84 |
*/ |
85 |
public void testConstructor6() { |
86 |
Integer[] ints = new Integer[SIZE]; |
87 |
for (int i = 0; i < SIZE; ++i) |
88 |
ints[i] = new Integer(i); |
89 |
ArrayDeque q = new ArrayDeque(Arrays.asList(ints)); |
90 |
for (int i = 0; i < SIZE; ++i) |
91 |
assertEquals(ints[i], q.pollFirst()); |
92 |
} |
93 |
|
94 |
/** |
95 |
* isEmpty is true before add, false after |
96 |
*/ |
97 |
public void testEmpty() { |
98 |
ArrayDeque q = new ArrayDeque(); |
99 |
assertTrue(q.isEmpty()); |
100 |
q.add(new Integer(1)); |
101 |
assertFalse(q.isEmpty()); |
102 |
q.add(new Integer(2)); |
103 |
q.removeFirst(); |
104 |
q.removeFirst(); |
105 |
assertTrue(q.isEmpty()); |
106 |
} |
107 |
|
108 |
/** |
109 |
* size changes when elements added and removed |
110 |
*/ |
111 |
public void testSize() { |
112 |
ArrayDeque q = populatedDeque(SIZE); |
113 |
for (int i = 0; i < SIZE; ++i) { |
114 |
assertEquals(SIZE - i, q.size()); |
115 |
q.removeFirst(); |
116 |
} |
117 |
for (int i = 0; i < SIZE; ++i) { |
118 |
assertEquals(i, q.size()); |
119 |
q.add(new Integer(i)); |
120 |
} |
121 |
} |
122 |
|
123 |
/** |
124 |
* push(null) throws NPE |
125 |
*/ |
126 |
public void testPushNull() { |
127 |
ArrayDeque q = new ArrayDeque(1); |
128 |
try { |
129 |
q.push(null); |
130 |
shouldThrow(); |
131 |
} catch (NullPointerException success) {} |
132 |
} |
133 |
|
134 |
/** |
135 |
* peekFirst() returns element inserted with push |
136 |
*/ |
137 |
public void testPush() { |
138 |
ArrayDeque q = populatedDeque(3); |
139 |
q.pollLast(); |
140 |
q.push(four); |
141 |
assertSame(four, q.peekFirst()); |
142 |
} |
143 |
|
144 |
/** |
145 |
* pop() removes next element, or throws NSEE if empty |
146 |
*/ |
147 |
public void testPop() { |
148 |
ArrayDeque q = populatedDeque(SIZE); |
149 |
for (int i = 0; i < SIZE; ++i) { |
150 |
assertEquals(i, q.pop()); |
151 |
} |
152 |
try { |
153 |
q.pop(); |
154 |
shouldThrow(); |
155 |
} catch (NoSuchElementException success) {} |
156 |
} |
157 |
|
158 |
/** |
159 |
* offer(null) throws NPE |
160 |
*/ |
161 |
public void testOfferNull() { |
162 |
ArrayDeque q = new ArrayDeque(); |
163 |
try { |
164 |
q.offer(null); |
165 |
shouldThrow(); |
166 |
} catch (NullPointerException success) {} |
167 |
} |
168 |
|
169 |
/** |
170 |
* offerFirst(null) throws NPE |
171 |
*/ |
172 |
public void testOfferFirstNull() { |
173 |
ArrayDeque q = new ArrayDeque(); |
174 |
try { |
175 |
q.offerFirst(null); |
176 |
shouldThrow(); |
177 |
} catch (NullPointerException success) {} |
178 |
} |
179 |
|
180 |
/** |
181 |
* offerLast(null) throws NPE |
182 |
*/ |
183 |
public void testOfferLastNull() { |
184 |
ArrayDeque q = new ArrayDeque(); |
185 |
try { |
186 |
q.offerLast(null); |
187 |
shouldThrow(); |
188 |
} catch (NullPointerException success) {} |
189 |
} |
190 |
|
191 |
/** |
192 |
* offer(x) succeeds |
193 |
*/ |
194 |
public void testOffer() { |
195 |
ArrayDeque q = new ArrayDeque(); |
196 |
assertTrue(q.offer(zero)); |
197 |
assertTrue(q.offer(one)); |
198 |
assertSame(zero, q.peekFirst()); |
199 |
assertSame(one, q.peekLast()); |
200 |
} |
201 |
|
202 |
/** |
203 |
* offerFirst(x) succeeds |
204 |
*/ |
205 |
public void testOfferFirst() { |
206 |
ArrayDeque q = new ArrayDeque(); |
207 |
assertTrue(q.offerFirst(zero)); |
208 |
assertTrue(q.offerFirst(one)); |
209 |
assertSame(one, q.peekFirst()); |
210 |
assertSame(zero, q.peekLast()); |
211 |
} |
212 |
|
213 |
/** |
214 |
* offerLast(x) succeeds |
215 |
*/ |
216 |
public void testOfferLast() { |
217 |
ArrayDeque q = new ArrayDeque(); |
218 |
assertTrue(q.offerLast(zero)); |
219 |
assertTrue(q.offerLast(one)); |
220 |
assertSame(zero, q.peekFirst()); |
221 |
assertSame(one, q.peekLast()); |
222 |
} |
223 |
|
224 |
/** |
225 |
* add(null) throws NPE |
226 |
*/ |
227 |
public void testAddNull() { |
228 |
ArrayDeque q = new ArrayDeque(); |
229 |
try { |
230 |
q.add(null); |
231 |
shouldThrow(); |
232 |
} catch (NullPointerException success) {} |
233 |
} |
234 |
|
235 |
/** |
236 |
* addFirst(null) throws NPE |
237 |
*/ |
238 |
public void testAddFirstNull() { |
239 |
ArrayDeque q = new ArrayDeque(); |
240 |
try { |
241 |
q.addFirst(null); |
242 |
shouldThrow(); |
243 |
} catch (NullPointerException success) {} |
244 |
} |
245 |
|
246 |
/** |
247 |
* addLast(null) throws NPE |
248 |
*/ |
249 |
public void testAddLastNull() { |
250 |
ArrayDeque q = new ArrayDeque(); |
251 |
try { |
252 |
q.addLast(null); |
253 |
shouldThrow(); |
254 |
} catch (NullPointerException success) {} |
255 |
} |
256 |
|
257 |
/** |
258 |
* add(x) succeeds |
259 |
*/ |
260 |
public void testAdd() { |
261 |
ArrayDeque q = new ArrayDeque(); |
262 |
assertTrue(q.add(zero)); |
263 |
assertTrue(q.add(one)); |
264 |
assertSame(zero, q.peekFirst()); |
265 |
assertSame(one, q.peekLast()); |
266 |
} |
267 |
|
268 |
/** |
269 |
* addFirst(x) succeeds |
270 |
*/ |
271 |
public void testAddFirst() { |
272 |
ArrayDeque q = new ArrayDeque(); |
273 |
q.addFirst(zero); |
274 |
q.addFirst(one); |
275 |
assertSame(one, q.peekFirst()); |
276 |
assertSame(zero, q.peekLast()); |
277 |
} |
278 |
|
279 |
/** |
280 |
* addLast(x) succeeds |
281 |
*/ |
282 |
public void testAddLast() { |
283 |
ArrayDeque q = new ArrayDeque(); |
284 |
q.addLast(zero); |
285 |
q.addLast(one); |
286 |
assertSame(zero, q.peekFirst()); |
287 |
assertSame(one, q.peekLast()); |
288 |
} |
289 |
|
290 |
/** |
291 |
* addAll(null) throws NPE |
292 |
*/ |
293 |
public void testAddAll1() { |
294 |
ArrayDeque q = new ArrayDeque(); |
295 |
try { |
296 |
q.addAll(null); |
297 |
shouldThrow(); |
298 |
} catch (NullPointerException success) {} |
299 |
} |
300 |
|
301 |
/** |
302 |
* addAll of a collection with null elements throws NPE |
303 |
*/ |
304 |
public void testAddAll2() { |
305 |
ArrayDeque q = new ArrayDeque(); |
306 |
try { |
307 |
q.addAll(Arrays.asList(new Integer[SIZE])); |
308 |
shouldThrow(); |
309 |
} catch (NullPointerException success) {} |
310 |
} |
311 |
|
312 |
/** |
313 |
* addAll of a collection with any null elements throws NPE after |
314 |
* possibly adding some elements |
315 |
*/ |
316 |
public void testAddAll3() { |
317 |
ArrayDeque q = new ArrayDeque(); |
318 |
Integer[] ints = new Integer[SIZE]; |
319 |
for (int i = 0; i < SIZE - 1; ++i) |
320 |
ints[i] = new Integer(i); |
321 |
try { |
322 |
q.addAll(Arrays.asList(ints)); |
323 |
shouldThrow(); |
324 |
} catch (NullPointerException success) {} |
325 |
} |
326 |
|
327 |
/** |
328 |
* Deque contains all elements, in traversal order, of successful addAll |
329 |
*/ |
330 |
public void testAddAll5() { |
331 |
Integer[] empty = new Integer[0]; |
332 |
Integer[] ints = new Integer[SIZE]; |
333 |
for (int i = 0; i < SIZE; ++i) |
334 |
ints[i] = new Integer(i); |
335 |
ArrayDeque q = new ArrayDeque(); |
336 |
assertFalse(q.addAll(Arrays.asList(empty))); |
337 |
assertTrue(q.addAll(Arrays.asList(ints))); |
338 |
for (int i = 0; i < SIZE; ++i) |
339 |
assertEquals(ints[i], q.pollFirst()); |
340 |
} |
341 |
|
342 |
/** |
343 |
* pollFirst() succeeds unless empty |
344 |
*/ |
345 |
public void testPollFirst() { |
346 |
ArrayDeque q = populatedDeque(SIZE); |
347 |
for (int i = 0; i < SIZE; ++i) { |
348 |
assertEquals(i, q.pollFirst()); |
349 |
} |
350 |
assertNull(q.pollFirst()); |
351 |
} |
352 |
|
353 |
/** |
354 |
* pollLast() succeeds unless empty |
355 |
*/ |
356 |
public void testPollLast() { |
357 |
ArrayDeque q = populatedDeque(SIZE); |
358 |
for (int i = SIZE - 1; i >= 0; --i) { |
359 |
assertEquals(i, q.pollLast()); |
360 |
} |
361 |
assertNull(q.pollLast()); |
362 |
} |
363 |
|
364 |
/** |
365 |
* poll() succeeds unless empty |
366 |
*/ |
367 |
public void testPoll() { |
368 |
ArrayDeque q = populatedDeque(SIZE); |
369 |
for (int i = 0; i < SIZE; ++i) { |
370 |
assertEquals(i, q.poll()); |
371 |
} |
372 |
assertNull(q.poll()); |
373 |
} |
374 |
|
375 |
/** |
376 |
* remove() removes next element, or throws NSEE if empty |
377 |
*/ |
378 |
public void testRemove() { |
379 |
ArrayDeque q = populatedDeque(SIZE); |
380 |
for (int i = 0; i < SIZE; ++i) { |
381 |
assertEquals(i, q.remove()); |
382 |
} |
383 |
try { |
384 |
q.remove(); |
385 |
shouldThrow(); |
386 |
} catch (NoSuchElementException success) {} |
387 |
} |
388 |
|
389 |
/** |
390 |
* remove(x) removes x and returns true if present |
391 |
*/ |
392 |
public void testRemoveElement() { |
393 |
ArrayDeque q = populatedDeque(SIZE); |
394 |
for (int i = 1; i < SIZE; i += 2) { |
395 |
assertTrue(q.contains(i)); |
396 |
assertTrue(q.remove(i)); |
397 |
assertFalse(q.contains(i)); |
398 |
assertTrue(q.contains(i - 1)); |
399 |
} |
400 |
for (int i = 0; i < SIZE; i += 2) { |
401 |
assertTrue(q.contains(i)); |
402 |
assertTrue(q.remove(i)); |
403 |
assertFalse(q.contains(i)); |
404 |
assertFalse(q.remove(i + 1)); |
405 |
assertFalse(q.contains(i + 1)); |
406 |
} |
407 |
assertTrue(q.isEmpty()); |
408 |
} |
409 |
|
410 |
/** |
411 |
* peekFirst() returns next element, or null if empty |
412 |
*/ |
413 |
public void testPeekFirst() { |
414 |
ArrayDeque q = populatedDeque(SIZE); |
415 |
for (int i = 0; i < SIZE; ++i) { |
416 |
assertEquals(i, q.peekFirst()); |
417 |
assertEquals(i, q.pollFirst()); |
418 |
assertTrue(q.peekFirst() == null || |
419 |
!q.peekFirst().equals(i)); |
420 |
} |
421 |
assertNull(q.peekFirst()); |
422 |
} |
423 |
|
424 |
/** |
425 |
* peek() returns next element, or null if empty |
426 |
*/ |
427 |
public void testPeek() { |
428 |
ArrayDeque q = populatedDeque(SIZE); |
429 |
for (int i = 0; i < SIZE; ++i) { |
430 |
assertEquals(i, q.peek()); |
431 |
assertEquals(i, q.poll()); |
432 |
assertTrue(q.peek() == null || |
433 |
!q.peek().equals(i)); |
434 |
} |
435 |
assertNull(q.peek()); |
436 |
} |
437 |
|
438 |
/** |
439 |
* peekLast() returns next element, or null if empty |
440 |
*/ |
441 |
public void testPeekLast() { |
442 |
ArrayDeque q = populatedDeque(SIZE); |
443 |
for (int i = SIZE - 1; i >= 0; --i) { |
444 |
assertEquals(i, q.peekLast()); |
445 |
assertEquals(i, q.pollLast()); |
446 |
assertTrue(q.peekLast() == null || |
447 |
!q.peekLast().equals(i)); |
448 |
} |
449 |
assertNull(q.peekLast()); |
450 |
} |
451 |
|
452 |
/** |
453 |
* element() returns first element, or throws NSEE if empty |
454 |
*/ |
455 |
public void testElement() { |
456 |
ArrayDeque q = populatedDeque(SIZE); |
457 |
for (int i = 0; i < SIZE; ++i) { |
458 |
assertEquals(i, q.element()); |
459 |
assertEquals(i, q.poll()); |
460 |
} |
461 |
try { |
462 |
q.element(); |
463 |
shouldThrow(); |
464 |
} catch (NoSuchElementException success) {} |
465 |
} |
466 |
|
467 |
/** |
468 |
* getFirst() returns first element, or throws NSEE if empty |
469 |
*/ |
470 |
public void testFirstElement() { |
471 |
ArrayDeque q = populatedDeque(SIZE); |
472 |
for (int i = 0; i < SIZE; ++i) { |
473 |
assertEquals(i, q.getFirst()); |
474 |
assertEquals(i, q.pollFirst()); |
475 |
} |
476 |
try { |
477 |
q.getFirst(); |
478 |
shouldThrow(); |
479 |
} catch (NoSuchElementException success) {} |
480 |
} |
481 |
|
482 |
/** |
483 |
* getLast() returns last element, or throws NSEE if empty |
484 |
*/ |
485 |
public void testLastElement() { |
486 |
ArrayDeque q = populatedDeque(SIZE); |
487 |
for (int i = SIZE - 1; i >= 0; --i) { |
488 |
assertEquals(i, q.getLast()); |
489 |
assertEquals(i, q.pollLast()); |
490 |
} |
491 |
try { |
492 |
q.getLast(); |
493 |
shouldThrow(); |
494 |
} catch (NoSuchElementException success) {} |
495 |
assertNull(q.peekLast()); |
496 |
} |
497 |
|
498 |
/** |
499 |
* removeFirst() removes first element, or throws NSEE if empty |
500 |
*/ |
501 |
public void testRemoveFirst() { |
502 |
ArrayDeque q = populatedDeque(SIZE); |
503 |
for (int i = 0; i < SIZE; ++i) { |
504 |
assertEquals(i, q.removeFirst()); |
505 |
} |
506 |
try { |
507 |
q.removeFirst(); |
508 |
shouldThrow(); |
509 |
} catch (NoSuchElementException success) {} |
510 |
assertNull(q.peekFirst()); |
511 |
} |
512 |
|
513 |
/** |
514 |
* removeLast() removes last element, or throws NSEE if empty |
515 |
*/ |
516 |
public void testRemoveLast() { |
517 |
ArrayDeque q = populatedDeque(SIZE); |
518 |
for (int i = SIZE - 1; i >= 0; --i) { |
519 |
assertEquals(i, q.removeLast()); |
520 |
} |
521 |
try { |
522 |
q.removeLast(); |
523 |
shouldThrow(); |
524 |
} catch (NoSuchElementException success) {} |
525 |
assertNull(q.peekLast()); |
526 |
} |
527 |
|
528 |
/** |
529 |
* removeFirstOccurrence(x) removes x and returns true if present |
530 |
*/ |
531 |
public void testRemoveFirstOccurrence() { |
532 |
ArrayDeque q = populatedDeque(SIZE); |
533 |
for (int i = 1; i < SIZE; i += 2) { |
534 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
535 |
} |
536 |
for (int i = 0; i < SIZE; i += 2) { |
537 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
538 |
assertFalse(q.removeFirstOccurrence(new Integer(i + 1))); |
539 |
} |
540 |
assertTrue(q.isEmpty()); |
541 |
} |
542 |
|
543 |
/** |
544 |
* removeLastOccurrence(x) removes x and returns true if present |
545 |
*/ |
546 |
public void testRemoveLastOccurrence() { |
547 |
ArrayDeque q = populatedDeque(SIZE); |
548 |
for (int i = 1; i < SIZE; i += 2) { |
549 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
550 |
} |
551 |
for (int i = 0; i < SIZE; i += 2) { |
552 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
553 |
assertFalse(q.removeLastOccurrence(new Integer(i + 1))); |
554 |
} |
555 |
assertTrue(q.isEmpty()); |
556 |
} |
557 |
|
558 |
/** |
559 |
* contains(x) reports true when elements added but not yet removed |
560 |
*/ |
561 |
public void testContains() { |
562 |
ArrayDeque q = populatedDeque(SIZE); |
563 |
for (int i = 0; i < SIZE; ++i) { |
564 |
assertTrue(q.contains(new Integer(i))); |
565 |
assertEquals(i, q.pollFirst()); |
566 |
assertFalse(q.contains(new Integer(i))); |
567 |
} |
568 |
} |
569 |
|
570 |
/** |
571 |
* clear removes all elements |
572 |
*/ |
573 |
public void testClear() { |
574 |
ArrayDeque q = populatedDeque(SIZE); |
575 |
q.clear(); |
576 |
assertTrue(q.isEmpty()); |
577 |
assertEquals(0, q.size()); |
578 |
assertTrue(q.add(new Integer(1))); |
579 |
assertFalse(q.isEmpty()); |
580 |
q.clear(); |
581 |
assertTrue(q.isEmpty()); |
582 |
} |
583 |
|
584 |
/** |
585 |
* containsAll(c) is true when c contains a subset of elements |
586 |
*/ |
587 |
public void testContainsAll() { |
588 |
ArrayDeque q = populatedDeque(SIZE); |
589 |
ArrayDeque p = new ArrayDeque(); |
590 |
for (int i = 0; i < SIZE; ++i) { |
591 |
assertTrue(q.containsAll(p)); |
592 |
assertFalse(p.containsAll(q)); |
593 |
assertTrue(p.add(new Integer(i))); |
594 |
} |
595 |
assertTrue(p.containsAll(q)); |
596 |
} |
597 |
|
598 |
/** |
599 |
* retainAll(c) retains only those elements of c and reports true if changed |
600 |
*/ |
601 |
public void testRetainAll() { |
602 |
ArrayDeque q = populatedDeque(SIZE); |
603 |
ArrayDeque p = populatedDeque(SIZE); |
604 |
for (int i = 0; i < SIZE; ++i) { |
605 |
boolean changed = q.retainAll(p); |
606 |
assertEquals(changed, (i > 0)); |
607 |
assertTrue(q.containsAll(p)); |
608 |
assertEquals(SIZE - i, q.size()); |
609 |
p.removeFirst(); |
610 |
} |
611 |
} |
612 |
|
613 |
/** |
614 |
* removeAll(c) removes only those elements of c and reports true if changed |
615 |
*/ |
616 |
public void testRemoveAll() { |
617 |
for (int i = 1; i < SIZE; ++i) { |
618 |
ArrayDeque q = populatedDeque(SIZE); |
619 |
ArrayDeque p = populatedDeque(i); |
620 |
assertTrue(q.removeAll(p)); |
621 |
assertEquals(SIZE - i, q.size()); |
622 |
for (int j = 0; j < i; ++j) { |
623 |
assertFalse(q.contains(p.removeFirst())); |
624 |
} |
625 |
} |
626 |
} |
627 |
|
628 |
void checkToArray(ArrayDeque q) { |
629 |
int size = q.size(); |
630 |
Object[] o = q.toArray(); |
631 |
assertEquals(size, o.length); |
632 |
Iterator it = q.iterator(); |
633 |
for (int i = 0; i < size; i++) { |
634 |
Integer x = (Integer) it.next(); |
635 |
assertEquals((Integer)o[0] + i, (int) x); |
636 |
assertSame(o[i], x); |
637 |
} |
638 |
} |
639 |
|
640 |
/** |
641 |
* toArray() contains all elements in FIFO order |
642 |
*/ |
643 |
public void testToArray() { |
644 |
ArrayDeque q = new ArrayDeque(); |
645 |
for (int i = 0; i < SIZE; i++) { |
646 |
checkToArray(q); |
647 |
q.addLast(i); |
648 |
} |
649 |
// Provoke wraparound |
650 |
for (int i = 0; i < SIZE; i++) { |
651 |
checkToArray(q); |
652 |
assertEquals(i, q.poll()); |
653 |
q.addLast(SIZE + i); |
654 |
} |
655 |
for (int i = 0; i < SIZE; i++) { |
656 |
checkToArray(q); |
657 |
assertEquals(SIZE + i, q.poll()); |
658 |
} |
659 |
} |
660 |
|
661 |
void checkToArray2(ArrayDeque q) { |
662 |
int size = q.size(); |
663 |
Integer[] a1 = (size == 0) ? null : new Integer[size - 1]; |
664 |
Integer[] a2 = new Integer[size]; |
665 |
Integer[] a3 = new Integer[size + 2]; |
666 |
if (size > 0) Arrays.fill(a1, 42); |
667 |
Arrays.fill(a2, 42); |
668 |
Arrays.fill(a3, 42); |
669 |
Integer[] b1 = (size == 0) ? null : (Integer[]) q.toArray(a1); |
670 |
Integer[] b2 = (Integer[]) q.toArray(a2); |
671 |
Integer[] b3 = (Integer[]) q.toArray(a3); |
672 |
assertSame(a2, b2); |
673 |
assertSame(a3, b3); |
674 |
Iterator it = q.iterator(); |
675 |
for (int i = 0; i < size; i++) { |
676 |
Integer x = (Integer) it.next(); |
677 |
assertSame(b1[i], x); |
678 |
assertEquals(b1[0] + i, (int) x); |
679 |
assertSame(b2[i], x); |
680 |
assertSame(b3[i], x); |
681 |
} |
682 |
assertNull(a3[size]); |
683 |
assertEquals(42, (int) a3[size + 1]); |
684 |
if (size > 0) { |
685 |
assertNotSame(a1, b1); |
686 |
assertEquals(size, b1.length); |
687 |
for (int i = 0; i < a1.length; i++) { |
688 |
assertEquals(42, (int) a1[i]); |
689 |
} |
690 |
} |
691 |
} |
692 |
|
693 |
/** |
694 |
* toArray(a) contains all elements in FIFO order |
695 |
*/ |
696 |
public void testToArray2() { |
697 |
ArrayDeque q = new ArrayDeque(); |
698 |
for (int i = 0; i < SIZE; i++) { |
699 |
checkToArray2(q); |
700 |
q.addLast(i); |
701 |
} |
702 |
// Provoke wraparound |
703 |
for (int i = 0; i < SIZE; i++) { |
704 |
checkToArray2(q); |
705 |
assertEquals(i, q.poll()); |
706 |
q.addLast(SIZE + i); |
707 |
} |
708 |
for (int i = 0; i < SIZE; i++) { |
709 |
checkToArray2(q); |
710 |
assertEquals(SIZE + i, q.poll()); |
711 |
} |
712 |
} |
713 |
|
714 |
/** |
715 |
* toArray(null) throws NullPointerException |
716 |
*/ |
717 |
public void testToArray_NullArg() { |
718 |
ArrayDeque l = new ArrayDeque(); |
719 |
l.add(new Object()); |
720 |
try { |
721 |
l.toArray(null); |
722 |
shouldThrow(); |
723 |
} catch (NullPointerException success) {} |
724 |
} |
725 |
|
726 |
/** |
727 |
* toArray(incompatible array type) throws ArrayStoreException |
728 |
*/ |
729 |
public void testToArray1_BadArg() { |
730 |
ArrayDeque l = new ArrayDeque(); |
731 |
l.add(new Integer(5)); |
732 |
try { |
733 |
l.toArray(new String[10]); |
734 |
shouldThrow(); |
735 |
} catch (ArrayStoreException success) {} |
736 |
} |
737 |
|
738 |
/** |
739 |
* Iterator iterates through all elements |
740 |
*/ |
741 |
public void testIterator() { |
742 |
ArrayDeque q = populatedDeque(SIZE); |
743 |
Iterator it = q.iterator(); |
744 |
int i; |
745 |
for (i = 0; it.hasNext(); i++) |
746 |
assertTrue(q.contains(it.next())); |
747 |
assertEquals(i, SIZE); |
748 |
assertIteratorExhausted(it); |
749 |
} |
750 |
|
751 |
/** |
752 |
* iterator of empty collection has no elements |
753 |
*/ |
754 |
public void testEmptyIterator() { |
755 |
Deque c = new ArrayDeque(); |
756 |
assertIteratorExhausted(c.iterator()); |
757 |
assertIteratorExhausted(c.descendingIterator()); |
758 |
} |
759 |
|
760 |
/** |
761 |
* Iterator ordering is FIFO |
762 |
*/ |
763 |
public void testIteratorOrdering() { |
764 |
final ArrayDeque q = new ArrayDeque(); |
765 |
q.add(one); |
766 |
q.add(two); |
767 |
q.add(three); |
768 |
int k = 0; |
769 |
for (Iterator it = q.iterator(); it.hasNext();) { |
770 |
assertEquals(++k, it.next()); |
771 |
} |
772 |
|
773 |
assertEquals(3, k); |
774 |
} |
775 |
|
776 |
/** |
777 |
* iterator.remove() removes current element |
778 |
*/ |
779 |
public void testIteratorRemove() { |
780 |
final ArrayDeque q = new ArrayDeque(); |
781 |
final Random rng = new Random(); |
782 |
for (int iters = 0; iters < 100; ++iters) { |
783 |
int max = rng.nextInt(5) + 2; |
784 |
int split = rng.nextInt(max - 1) + 1; |
785 |
for (int j = 1; j <= max; ++j) |
786 |
q.add(new Integer(j)); |
787 |
Iterator it = q.iterator(); |
788 |
for (int j = 1; j <= split; ++j) |
789 |
assertEquals(it.next(), new Integer(j)); |
790 |
it.remove(); |
791 |
assertEquals(it.next(), new Integer(split + 1)); |
792 |
for (int j = 1; j <= split; ++j) |
793 |
q.remove(new Integer(j)); |
794 |
it = q.iterator(); |
795 |
for (int j = split + 1; j <= max; ++j) { |
796 |
assertEquals(it.next(), new Integer(j)); |
797 |
it.remove(); |
798 |
} |
799 |
assertFalse(it.hasNext()); |
800 |
assertTrue(q.isEmpty()); |
801 |
} |
802 |
} |
803 |
|
804 |
/** |
805 |
* Descending iterator iterates through all elements |
806 |
*/ |
807 |
public void testDescendingIterator() { |
808 |
ArrayDeque q = populatedDeque(SIZE); |
809 |
int i = 0; |
810 |
Iterator it = q.descendingIterator(); |
811 |
while (it.hasNext()) { |
812 |
assertTrue(q.contains(it.next())); |
813 |
++i; |
814 |
} |
815 |
assertEquals(i, SIZE); |
816 |
assertFalse(it.hasNext()); |
817 |
try { |
818 |
it.next(); |
819 |
shouldThrow(); |
820 |
} catch (NoSuchElementException success) {} |
821 |
} |
822 |
|
823 |
/** |
824 |
* Descending iterator ordering is reverse FIFO |
825 |
*/ |
826 |
public void testDescendingIteratorOrdering() { |
827 |
final ArrayDeque q = new ArrayDeque(); |
828 |
for (int iters = 0; iters < 100; ++iters) { |
829 |
q.add(new Integer(3)); |
830 |
q.add(new Integer(2)); |
831 |
q.add(new Integer(1)); |
832 |
int k = 0; |
833 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
834 |
assertEquals(++k, it.next()); |
835 |
} |
836 |
|
837 |
assertEquals(3, k); |
838 |
q.remove(); |
839 |
q.remove(); |
840 |
q.remove(); |
841 |
} |
842 |
} |
843 |
|
844 |
/** |
845 |
* descendingIterator.remove() removes current element |
846 |
*/ |
847 |
public void testDescendingIteratorRemove() { |
848 |
final ArrayDeque q = new ArrayDeque(); |
849 |
final Random rng = new Random(); |
850 |
for (int iters = 0; iters < 100; ++iters) { |
851 |
int max = rng.nextInt(5) + 2; |
852 |
int split = rng.nextInt(max - 1) + 1; |
853 |
for (int j = max; j >= 1; --j) |
854 |
q.add(new Integer(j)); |
855 |
Iterator it = q.descendingIterator(); |
856 |
for (int j = 1; j <= split; ++j) |
857 |
assertEquals(it.next(), new Integer(j)); |
858 |
it.remove(); |
859 |
assertEquals(it.next(), new Integer(split + 1)); |
860 |
for (int j = 1; j <= split; ++j) |
861 |
q.remove(new Integer(j)); |
862 |
it = q.descendingIterator(); |
863 |
for (int j = split + 1; j <= max; ++j) { |
864 |
assertEquals(it.next(), new Integer(j)); |
865 |
it.remove(); |
866 |
} |
867 |
assertFalse(it.hasNext()); |
868 |
assertTrue(q.isEmpty()); |
869 |
} |
870 |
} |
871 |
|
872 |
/** |
873 |
* toString() contains toStrings of elements |
874 |
*/ |
875 |
public void testToString() { |
876 |
ArrayDeque q = populatedDeque(SIZE); |
877 |
String s = q.toString(); |
878 |
for (int i = 0; i < SIZE; ++i) { |
879 |
assertTrue(s.contains(String.valueOf(i))); |
880 |
} |
881 |
} |
882 |
|
883 |
/** |
884 |
* A deserialized serialized deque has same elements in same order |
885 |
*/ |
886 |
public void testSerialization() throws Exception { |
887 |
Queue x = populatedDeque(SIZE); |
888 |
Queue y = serialClone(x); |
889 |
|
890 |
assertNotSame(y, x); |
891 |
assertEquals(x.size(), y.size()); |
892 |
assertEquals(x.toString(), y.toString()); |
893 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
894 |
while (!x.isEmpty()) { |
895 |
assertFalse(y.isEmpty()); |
896 |
assertEquals(x.remove(), y.remove()); |
897 |
} |
898 |
assertTrue(y.isEmpty()); |
899 |
} |
900 |
|
901 |
/** |
902 |
* remove(null), contains(null) always return false |
903 |
*/ |
904 |
public void testNeverContainsNull() { |
905 |
Deque<?>[] qs = { |
906 |
new ArrayDeque<Object>(), |
907 |
populatedDeque(2), |
908 |
}; |
909 |
|
910 |
for (Deque<?> q : qs) { |
911 |
assertFalse(q.contains(null)); |
912 |
assertFalse(q.remove(null)); |
913 |
assertFalse(q.removeFirstOccurrence(null)); |
914 |
assertFalse(q.removeLastOccurrence(null)); |
915 |
} |
916 |
} |
917 |
|
918 |
} |