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/* |
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< |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 |
< |
* Expert Group and released to the public domain, as explained at |
| 2 |
> |
* Written by Doug Lea and Martin Buchholz with assistance from |
| 3 |
> |
* members of JCP JSR-166 Expert Group and released to the public |
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> |
* domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
| 13 |
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import java.util.NoSuchElementException; |
| 14 |
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import java.util.Queue; |
| 15 |
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import java.util.Random; |
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+ |
import java.util.concurrent.ThreadLocalRandom; |
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|
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import junit.framework.Test; |
| 17 |
– |
import junit.framework.TestSuite; |
| 19 |
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| 20 |
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public class ArrayDequeTest extends JSR166TestCase { |
| 21 |
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public static void main(String[] args) { |
| 23 |
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} |
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|
| 25 |
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public static Test suite() { |
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< |
return new TestSuite(ArrayDequeTest.class); |
| 26 |
> |
class Implementation implements CollectionImplementation { |
| 27 |
> |
public Class<?> klazz() { return ArrayDeque.class; } |
| 28 |
> |
public Collection emptyCollection() { return populatedDeque(0); } |
| 29 |
> |
public Object makeElement(int i) { return i; } |
| 30 |
> |
public boolean isConcurrent() { return false; } |
| 31 |
> |
public boolean permitsNulls() { return false; } |
| 32 |
> |
} |
| 33 |
> |
return newTestSuite(ArrayDequeTest.class, |
| 34 |
> |
CollectionTest.testSuite(new Implementation())); |
| 35 |
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} |
| 36 |
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|
| 37 |
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/** |
| 38 |
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* Returns a new deque of given size containing consecutive |
| 39 |
< |
* Integers 0 ... n. |
| 39 |
> |
* Integers 0 ... n - 1. |
| 40 |
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*/ |
| 41 |
< |
private ArrayDeque<Integer> populatedDeque(int n) { |
| 42 |
< |
ArrayDeque<Integer> q = new ArrayDeque<Integer>(); |
| 41 |
> |
private static ArrayDeque<Integer> populatedDeque(int n) { |
| 42 |
> |
// Randomize various aspects of memory layout, including |
| 43 |
> |
// capacity slop and wraparound. |
| 44 |
> |
final ArrayDeque<Integer> q; |
| 45 |
> |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| 46 |
> |
switch (rnd.nextInt(6)) { |
| 47 |
> |
case 0: q = new ArrayDeque<Integer>(); break; |
| 48 |
> |
case 1: q = new ArrayDeque<Integer>(0); break; |
| 49 |
> |
case 2: q = new ArrayDeque<Integer>(1); break; |
| 50 |
> |
case 3: q = new ArrayDeque<Integer>(Math.max(0, n - 1)); break; |
| 51 |
> |
case 4: q = new ArrayDeque<Integer>(n); break; |
| 52 |
> |
case 5: q = new ArrayDeque<Integer>(n + 1); break; |
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> |
default: throw new AssertionError(); |
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> |
} |
| 55 |
> |
switch (rnd.nextInt(3)) { |
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> |
case 0: |
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> |
q.addFirst(42); |
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> |
assertEquals((Integer) 42, q.removeLast()); |
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> |
break; |
| 60 |
> |
case 1: |
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> |
q.addLast(42); |
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> |
assertEquals((Integer) 42, q.removeFirst()); |
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> |
break; |
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> |
case 2: /* do nothing */ break; |
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> |
default: throw new AssertionError(); |
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> |
} |
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assertTrue(q.isEmpty()); |
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< |
for (int i = 0; i < n; ++i) |
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< |
assertTrue(q.offerLast(new Integer(i))); |
| 70 |
< |
assertFalse(q.isEmpty()); |
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> |
if (rnd.nextBoolean()) |
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> |
for (int i = 0; i < n; i++) |
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> |
assertTrue(q.offerLast((Integer) i)); |
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> |
else |
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> |
for (int i = n; --i >= 0; ) |
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> |
q.addFirst((Integer) i); |
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assertEquals(n, q.size()); |
| 75 |
+ |
if (n > 0) { |
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+ |
assertFalse(q.isEmpty()); |
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+ |
assertEquals((Integer) 0, q.peekFirst()); |
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+ |
assertEquals((Integer) (n - 1), q.peekLast()); |
| 79 |
+ |
} |
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return q; |
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} |
| 82 |
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|
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assertTrue(q.contains(i)); |
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assertTrue(q.remove(i)); |
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assertFalse(q.contains(i)); |
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< |
assertTrue(q.contains(i-1)); |
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> |
assertTrue(q.contains(i - 1)); |
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} |
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for (int i = 0; i < SIZE; i += 2) { |
| 442 |
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assertTrue(q.contains(i)); |
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assertTrue(q.remove(i)); |
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assertFalse(q.contains(i)); |
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assertFalse(q.remove(i+1)); |
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< |
assertFalse(q.contains(i+1)); |
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> |
assertFalse(q.remove(i + 1)); |
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> |
assertFalse(q.contains(i + 1)); |
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} |
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assertTrue(q.isEmpty()); |
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} |
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* removeFirstOccurrence(x) removes x and returns true if present |
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*/ |
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public void testRemoveFirstOccurrence() { |
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< |
ArrayDeque q = populatedDeque(SIZE); |
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> |
Deque<Integer> q = populatedDeque(SIZE); |
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> |
assertFalse(q.removeFirstOccurrence(null)); |
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for (int i = 1; i < SIZE; i += 2) { |
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< |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
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> |
assertTrue(q.removeFirstOccurrence(i)); |
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> |
assertFalse(q.contains(i)); |
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} |
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for (int i = 0; i < SIZE; i += 2) { |
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< |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
| 581 |
< |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
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> |
assertTrue(q.removeFirstOccurrence(i)); |
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> |
assertFalse(q.removeFirstOccurrence(i + 1)); |
| 582 |
> |
assertFalse(q.contains(i)); |
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> |
assertFalse(q.contains(i + 1)); |
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} |
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assertTrue(q.isEmpty()); |
| 586 |
+ |
assertFalse(q.removeFirstOccurrence(null)); |
| 587 |
+ |
assertFalse(q.removeFirstOccurrence(42)); |
| 588 |
+ |
q = new ArrayDeque(); |
| 589 |
+ |
assertFalse(q.removeFirstOccurrence(null)); |
| 590 |
+ |
assertFalse(q.removeFirstOccurrence(42)); |
| 591 |
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} |
| 592 |
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|
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/** |
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* removeLastOccurrence(x) removes x and returns true if present |
| 595 |
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*/ |
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public void testRemoveLastOccurrence() { |
| 597 |
< |
ArrayDeque q = populatedDeque(SIZE); |
| 597 |
> |
Deque<Integer> q = populatedDeque(SIZE); |
| 598 |
> |
assertFalse(q.removeLastOccurrence(null)); |
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for (int i = 1; i < SIZE; i += 2) { |
| 600 |
< |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
| 600 |
> |
assertTrue(q.removeLastOccurrence(i)); |
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> |
assertFalse(q.contains(i)); |
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} |
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for (int i = 0; i < SIZE; i += 2) { |
| 604 |
< |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
| 605 |
< |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
| 604 |
> |
assertTrue(q.removeLastOccurrence(i)); |
| 605 |
> |
assertFalse(q.removeLastOccurrence(i + 1)); |
| 606 |
> |
assertFalse(q.contains(i)); |
| 607 |
> |
assertFalse(q.contains(i + 1)); |
| 608 |
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} |
| 609 |
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assertTrue(q.isEmpty()); |
| 610 |
+ |
assertFalse(q.removeLastOccurrence(null)); |
| 611 |
+ |
assertFalse(q.removeLastOccurrence(42)); |
| 612 |
+ |
q = new ArrayDeque(); |
| 613 |
+ |
assertFalse(q.removeLastOccurrence(null)); |
| 614 |
+ |
assertFalse(q.removeLastOccurrence(42)); |
| 615 |
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} |
| 616 |
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|
| 617 |
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/** |
| 684 |
|
} |
| 685 |
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} |
| 686 |
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|
| 687 |
< |
void checkToArray(ArrayDeque q) { |
| 687 |
> |
void checkToArray(ArrayDeque<Integer> q) { |
| 688 |
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int size = q.size(); |
| 689 |
< |
Object[] o = q.toArray(); |
| 690 |
< |
assertEquals(size, o.length); |
| 689 |
> |
Object[] a1 = q.toArray(); |
| 690 |
> |
assertEquals(size, a1.length); |
| 691 |
> |
Integer[] a2 = q.toArray(new Integer[0]); |
| 692 |
> |
assertEquals(size, a2.length); |
| 693 |
> |
Integer[] a3 = q.toArray(new Integer[Math.max(0, size - 1)]); |
| 694 |
> |
assertEquals(size, a3.length); |
| 695 |
> |
Integer[] a4 = new Integer[size]; |
| 696 |
> |
assertSame(a4, q.toArray(a4)); |
| 697 |
> |
Integer[] a5 = new Integer[size + 1]; |
| 698 |
> |
Arrays.fill(a5, 42); |
| 699 |
> |
assertSame(a5, q.toArray(a5)); |
| 700 |
> |
Integer[] a6 = new Integer[size + 2]; |
| 701 |
> |
Arrays.fill(a6, 42); |
| 702 |
> |
assertSame(a6, q.toArray(a6)); |
| 703 |
> |
Object[][] as = { a1, a2, a3, a4, a5, a6 }; |
| 704 |
> |
for (Object[] a : as) { |
| 705 |
> |
if (a.length > size) assertNull(a[size]); |
| 706 |
> |
if (a.length > size + 1) assertEquals(42, a[size + 1]); |
| 707 |
> |
} |
| 708 |
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Iterator it = q.iterator(); |
| 709 |
+ |
Integer s = q.peekFirst(); |
| 710 |
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for (int i = 0; i < size; i++) { |
| 711 |
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Integer x = (Integer) it.next(); |
| 712 |
< |
assertEquals((Integer)o[0] + i, (int) x); |
| 713 |
< |
assertSame(o[i], x); |
| 712 |
> |
assertEquals(s + i, (int) x); |
| 713 |
> |
for (Object[] a : as) |
| 714 |
> |
assertSame(a1[i], x); |
| 715 |
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} |
| 716 |
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} |
| 717 |
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|
| 718 |
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/** |
| 719 |
< |
* toArray() contains all elements in FIFO order |
| 719 |
> |
* toArray() and toArray(a) contain all elements in FIFO order |
| 720 |
|
*/ |
| 721 |
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public void testToArray() { |
| 722 |
< |
ArrayDeque q = new ArrayDeque(); |
| 723 |
< |
for (int i = 0; i < SIZE; i++) { |
| 722 |
> |
final int size = ThreadLocalRandom.current().nextInt(10); |
| 723 |
> |
ArrayDeque<Integer> q = new ArrayDeque<>(size); |
| 724 |
> |
for (int i = 0; i < size; i++) { |
| 725 |
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checkToArray(q); |
| 726 |
|
q.addLast(i); |
| 727 |
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} |
| 728 |
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// Provoke wraparound |
| 729 |
< |
for (int i = 0; i < SIZE; i++) { |
| 730 |
< |
checkToArray(q); |
| 652 |
< |
assertEquals(i, q.poll()); |
| 653 |
< |
q.addLast(SIZE + i); |
| 654 |
< |
} |
| 655 |
< |
for (int i = 0; i < SIZE; i++) { |
| 729 |
> |
int added = size * 2; |
| 730 |
> |
for (int i = 0; i < added; i++) { |
| 731 |
|
checkToArray(q); |
| 732 |
< |
assertEquals(SIZE + i, q.poll()); |
| 732 |
> |
assertEquals((Integer) i, q.poll()); |
| 733 |
> |
q.addLast(size + i); |
| 734 |
|
} |
| 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(); |
| 735 |
|
for (int i = 0; i < size; i++) { |
| 736 |
< |
Integer x = (Integer) it.next(); |
| 737 |
< |
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()); |
| 736 |
> |
checkToArray(q); |
| 737 |
> |
assertEquals((Integer) (added + i), q.poll()); |
| 738 |
|
} |
| 739 |
|
} |
| 740 |
|
|
| 753 |
|
/** |
| 754 |
|
* toArray(incompatible array type) throws ArrayStoreException |
| 755 |
|
*/ |
| 756 |
< |
public void testToArray1_BadArg() { |
| 756 |
> |
public void testToArray_incompatibleArrayType() { |
| 757 |
|
ArrayDeque l = new ArrayDeque(); |
| 758 |
|
l.add(new Integer(5)); |
| 759 |
|
try { |
| 760 |
|
l.toArray(new String[10]); |
| 761 |
|
shouldThrow(); |
| 762 |
|
} catch (ArrayStoreException success) {} |
| 763 |
+ |
try { |
| 764 |
+ |
l.toArray(new String[0]); |
| 765 |
+ |
shouldThrow(); |
| 766 |
+ |
} catch (ArrayStoreException success) {} |
| 767 |
|
} |
| 768 |
|
|
| 769 |
|
/** |
| 812 |
|
final Random rng = new Random(); |
| 813 |
|
for (int iters = 0; iters < 100; ++iters) { |
| 814 |
|
int max = rng.nextInt(5) + 2; |
| 815 |
< |
int split = rng.nextInt(max-1) + 1; |
| 815 |
> |
int split = rng.nextInt(max - 1) + 1; |
| 816 |
|
for (int j = 1; j <= max; ++j) |
| 817 |
|
q.add(new Integer(j)); |
| 818 |
|
Iterator it = q.iterator(); |
| 819 |
|
for (int j = 1; j <= split; ++j) |
| 820 |
|
assertEquals(it.next(), new Integer(j)); |
| 821 |
|
it.remove(); |
| 822 |
< |
assertEquals(it.next(), new Integer(split+1)); |
| 822 |
> |
assertEquals(it.next(), new Integer(split + 1)); |
| 823 |
|
for (int j = 1; j <= split; ++j) |
| 824 |
|
q.remove(new Integer(j)); |
| 825 |
|
it = q.iterator(); |
| 826 |
< |
for (int j = split+1; j <= max; ++j) { |
| 826 |
> |
for (int j = split + 1; j <= max; ++j) { |
| 827 |
|
assertEquals(it.next(), new Integer(j)); |
| 828 |
|
it.remove(); |
| 829 |
|
} |
| 880 |
|
final Random rng = new Random(); |
| 881 |
|
for (int iters = 0; iters < 100; ++iters) { |
| 882 |
|
int max = rng.nextInt(5) + 2; |
| 883 |
< |
int split = rng.nextInt(max-1) + 1; |
| 883 |
> |
int split = rng.nextInt(max - 1) + 1; |
| 884 |
|
for (int j = max; j >= 1; --j) |
| 885 |
|
q.add(new Integer(j)); |
| 886 |
|
Iterator it = q.descendingIterator(); |
| 887 |
|
for (int j = 1; j <= split; ++j) |
| 888 |
|
assertEquals(it.next(), new Integer(j)); |
| 889 |
|
it.remove(); |
| 890 |
< |
assertEquals(it.next(), new Integer(split+1)); |
| 890 |
> |
assertEquals(it.next(), new Integer(split + 1)); |
| 891 |
|
for (int j = 1; j <= split; ++j) |
| 892 |
|
q.remove(new Integer(j)); |
| 893 |
|
it = q.descendingIterator(); |
| 894 |
< |
for (int j = split+1; j <= max; ++j) { |
| 894 |
> |
for (int j = split + 1; j <= max; ++j) { |
| 895 |
|
assertEquals(it.next(), new Integer(j)); |
| 896 |
|
it.remove(); |
| 897 |
|
} |
| 912 |
|
} |
| 913 |
|
|
| 914 |
|
/** |
| 915 |
< |
* A deserialized serialized deque has same elements in same order |
| 915 |
> |
* A deserialized/reserialized deque has same elements in same order |
| 916 |
|
*/ |
| 917 |
|
public void testSerialization() throws Exception { |
| 918 |
|
Queue x = populatedDeque(SIZE); |
| 920 |
|
|
| 921 |
|
assertNotSame(y, x); |
| 922 |
|
assertEquals(x.size(), y.size()); |
| 923 |
+ |
assertEquals(x.toString(), y.toString()); |
| 924 |
+ |
assertEquals(Arrays.toString(x.toArray()), Arrays.toString(y.toArray())); |
| 925 |
+ |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
| 926 |
+ |
while (!x.isEmpty()) { |
| 927 |
+ |
assertFalse(y.isEmpty()); |
| 928 |
+ |
assertEquals(x.remove(), y.remove()); |
| 929 |
+ |
} |
| 930 |
+ |
assertTrue(y.isEmpty()); |
| 931 |
+ |
} |
| 932 |
+ |
|
| 933 |
+ |
/** |
| 934 |
+ |
* A cloned deque has same elements in same order |
| 935 |
+ |
*/ |
| 936 |
+ |
public void testClone() throws Exception { |
| 937 |
+ |
ArrayDeque<Integer> x = populatedDeque(SIZE); |
| 938 |
+ |
ArrayDeque<Integer> y = x.clone(); |
| 939 |
+ |
|
| 940 |
+ |
assertNotSame(y, x); |
| 941 |
+ |
assertEquals(x.size(), y.size()); |
| 942 |
|
assertEquals(x.toString(), y.toString()); |
| 943 |
|
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
| 944 |
|
while (!x.isEmpty()) { |
