578 |
|
*/ |
579 |
|
public void clear() { |
580 |
|
modCount++; |
581 |
< |
Arrays.fill(elementData, 0, size, null); |
582 |
< |
size = 0; |
581 |
> |
final Object[] es = elementData; |
582 |
> |
for (int to = size, i = size = 0; i < to; i++) |
583 |
> |
es[i] = null; |
584 |
|
} |
585 |
|
|
586 |
|
/** |
670 |
|
outOfBoundsMsg(fromIndex, toIndex)); |
671 |
|
} |
672 |
|
modCount++; |
673 |
< |
final Object[] es = elementData; |
673 |
< |
final int oldSize = size; |
674 |
< |
System.arraycopy(es, toIndex, es, fromIndex, oldSize - toIndex); |
675 |
< |
Arrays.fill(es, size -= (toIndex - fromIndex), oldSize, null); |
673 |
> |
shiftTailOverGap(elementData, fromIndex, toIndex); |
674 |
|
// checkInvariants(); |
675 |
|
} |
676 |
|
|
677 |
+ |
/** Erases the gap from lo to hi, by sliding down following elements. */ |
678 |
+ |
private void shiftTailOverGap(Object[] es, int lo, int hi) { |
679 |
+ |
System.arraycopy(es, hi, es, lo, size - hi); |
680 |
+ |
for (int to = size, i = (size -= hi - lo); i < to; i++) |
681 |
+ |
es[i] = null; |
682 |
+ |
} |
683 |
+ |
|
684 |
|
/** |
685 |
|
* A version of rangeCheck used by add and addAll. |
686 |
|
*/ |
766 |
|
w += end - r; |
767 |
|
throw ex; |
768 |
|
} finally { |
769 |
< |
final int oldSize = size, deleted = end - w; |
770 |
< |
modCount += deleted; |
766 |
< |
System.arraycopy(es, end, es, w, oldSize - end); |
767 |
< |
Arrays.fill(es, size -= deleted, oldSize, null); |
769 |
> |
modCount += end - w; |
770 |
> |
shiftTailOverGap(es, w, end); |
771 |
|
} |
772 |
|
} |
773 |
|
// checkInvariants(); |
775 |
|
} |
776 |
|
|
777 |
|
/** |
778 |
< |
* Save the state of the {@code ArrayList} instance to a stream (that |
779 |
< |
* is, serialize it). |
778 |
> |
* Saves the state of the {@code ArrayList} instance to a stream |
779 |
> |
* (that is, serializes it). |
780 |
|
* |
781 |
+ |
* @param s the stream |
782 |
+ |
* @throws java.io.IOException if an I/O error occurs |
783 |
|
* @serialData The length of the array backing the {@code ArrayList} |
784 |
|
* instance is emitted (int), followed by all of its elements |
785 |
|
* (each an {@code Object}) in the proper order. |
786 |
|
*/ |
787 |
|
private void writeObject(java.io.ObjectOutputStream s) |
788 |
< |
throws java.io.IOException{ |
788 |
> |
throws java.io.IOException { |
789 |
|
// Write out element count, and any hidden stuff |
790 |
|
int expectedModCount = modCount; |
791 |
|
s.defaultWriteObject(); |
804 |
|
} |
805 |
|
|
806 |
|
/** |
807 |
< |
* Reconstitute the {@code ArrayList} instance from a stream (that is, |
808 |
< |
* deserialize it). |
807 |
> |
* Reconstitutes the {@code ArrayList} instance from a stream (that is, |
808 |
> |
* deserializes it). |
809 |
> |
* @param s the stream |
810 |
> |
* @throws ClassNotFoundException if the class of a serialized object |
811 |
> |
* could not be found |
812 |
> |
* @throws java.io.IOException if an I/O error occurs |
813 |
|
*/ |
814 |
|
private void readObject(java.io.ObjectInputStream s) |
815 |
|
throws java.io.IOException, ClassNotFoundException { |
921 |
|
} |
922 |
|
|
923 |
|
@Override |
924 |
< |
@SuppressWarnings("unchecked") |
925 |
< |
public void forEachRemaining(Consumer<? super E> consumer) { |
917 |
< |
Objects.requireNonNull(consumer); |
924 |
> |
public void forEachRemaining(Consumer<? super E> action) { |
925 |
> |
Objects.requireNonNull(action); |
926 |
|
final int size = ArrayList.this.size; |
927 |
|
int i = cursor; |
928 |
< |
if (i >= size) { |
929 |
< |
return; |
930 |
< |
} |
931 |
< |
final Object[] elementData = ArrayList.this.elementData; |
932 |
< |
if (i >= elementData.length) { |
933 |
< |
throw new ConcurrentModificationException(); |
934 |
< |
} |
935 |
< |
while (i != size && modCount == expectedModCount) { |
936 |
< |
consumer.accept((E) elementData[i++]); |
928 |
> |
if (i < size) { |
929 |
> |
final Object[] es = elementData; |
930 |
> |
if (i >= es.length) |
931 |
> |
throw new ConcurrentModificationException(); |
932 |
> |
for (; i < size && modCount == expectedModCount; i++) |
933 |
> |
action.accept(elementAt(es, i)); |
934 |
> |
// update once at end to reduce heap write traffic |
935 |
> |
cursor = i; |
936 |
> |
lastRet = i - 1; |
937 |
> |
checkForComodification(); |
938 |
|
} |
930 |
– |
// update once at end of iteration to reduce heap write traffic |
931 |
– |
cursor = i; |
932 |
– |
lastRet = i - 1; |
933 |
– |
checkForComodification(); |
939 |
|
} |
940 |
|
|
941 |
|
final void checkForComodification() { |
1196 |
|
return (E) elementData[offset + (lastRet = i)]; |
1197 |
|
} |
1198 |
|
|
1199 |
< |
@SuppressWarnings("unchecked") |
1200 |
< |
public void forEachRemaining(Consumer<? super E> consumer) { |
1196 |
< |
Objects.requireNonNull(consumer); |
1199 |
> |
public void forEachRemaining(Consumer<? super E> action) { |
1200 |
> |
Objects.requireNonNull(action); |
1201 |
|
final int size = SubList.this.size; |
1202 |
|
int i = cursor; |
1203 |
< |
if (i >= size) { |
1204 |
< |
return; |
1205 |
< |
} |
1206 |
< |
final Object[] elementData = root.elementData; |
1207 |
< |
if (offset + i >= elementData.length) { |
1208 |
< |
throw new ConcurrentModificationException(); |
1209 |
< |
} |
1210 |
< |
while (i != size && modCount == expectedModCount) { |
1211 |
< |
consumer.accept((E) elementData[offset + (i++)]); |
1203 |
> |
if (i < size) { |
1204 |
> |
final Object[] es = root.elementData; |
1205 |
> |
if (offset + i >= es.length) |
1206 |
> |
throw new ConcurrentModificationException(); |
1207 |
> |
for (; i < size && modCount == expectedModCount; i++) |
1208 |
> |
action.accept(elementAt(es, offset + i)); |
1209 |
> |
// update once at end to reduce heap write traffic |
1210 |
> |
cursor = i; |
1211 |
> |
lastRet = i - 1; |
1212 |
> |
checkForComodification(); |
1213 |
|
} |
1209 |
– |
// update once at end of iteration to reduce heap write traffic |
1210 |
– |
cursor = i; |
1211 |
– |
lastRet = i - 1; |
1212 |
– |
checkForComodification(); |
1214 |
|
} |
1215 |
|
|
1216 |
|
public int nextIndex() { |
1300 |
|
public Spliterator<E> spliterator() { |
1301 |
|
checkForComodification(); |
1302 |
|
|
1303 |
< |
// ArrayListSpliterator is not used because late-binding logic |
1304 |
< |
// is different here |
1304 |
< |
return new Spliterator<>() { |
1303 |
> |
// ArrayListSpliterator not used here due to late-binding |
1304 |
> |
return new Spliterator<E>() { |
1305 |
|
private int index = offset; // current index, modified on advance/split |
1306 |
|
private int fence = -1; // -1 until used; then one past last index |
1307 |
|
private int expectedModCount; // initialized when fence set |
1315 |
|
return hi; |
1316 |
|
} |
1317 |
|
|
1318 |
< |
public ArrayListSpliterator<E> trySplit() { |
1318 |
> |
public ArrayList<E>.ArrayListSpliterator trySplit() { |
1319 |
|
int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; |
1320 |
< |
// ArrayListSpliterator could be used here as the source is already bound |
1320 |
> |
// ArrayListSpliterator can be used here as the source is already bound |
1321 |
|
return (lo >= mid) ? null : // divide range in half unless too small |
1322 |
< |
new ArrayListSpliterator<>(root, lo, index = mid, |
1323 |
< |
expectedModCount); |
1322 |
> |
root.new ArrayListSpliterator(lo, index = mid, expectedModCount); |
1323 |
|
} |
1324 |
|
|
1325 |
|
public boolean tryAdvance(Consumer<? super E> action) { |
1361 |
|
} |
1362 |
|
|
1363 |
|
public long estimateSize() { |
1364 |
< |
return (long) (getFence() - index); |
1364 |
> |
return getFence() - index; |
1365 |
|
} |
1366 |
|
|
1367 |
|
public int characteristics() { |
1398 |
|
*/ |
1399 |
|
@Override |
1400 |
|
public Spliterator<E> spliterator() { |
1401 |
< |
return new ArrayListSpliterator<>(this, 0, -1, 0); |
1401 |
> |
return new ArrayListSpliterator(0, -1, 0); |
1402 |
|
} |
1403 |
|
|
1404 |
|
/** Index-based split-by-two, lazily initialized Spliterator */ |
1405 |
< |
static final class ArrayListSpliterator<E> implements Spliterator<E> { |
1405 |
> |
final class ArrayListSpliterator implements Spliterator<E> { |
1406 |
|
|
1407 |
|
/* |
1408 |
|
* If ArrayLists were immutable, or structurally immutable (no |
1436 |
|
* these streamlinings. |
1437 |
|
*/ |
1438 |
|
|
1440 |
– |
private final ArrayList<E> list; |
1439 |
|
private int index; // current index, modified on advance/split |
1440 |
|
private int fence; // -1 until used; then one past last index |
1441 |
|
private int expectedModCount; // initialized when fence set |
1442 |
|
|
1443 |
|
/** Create new spliterator covering the given range */ |
1444 |
< |
ArrayListSpliterator(ArrayList<E> list, int origin, int fence, |
1447 |
< |
int expectedModCount) { |
1448 |
< |
this.list = list; // OK if null unless traversed |
1444 |
> |
ArrayListSpliterator(int origin, int fence, int expectedModCount) { |
1445 |
|
this.index = origin; |
1446 |
|
this.fence = fence; |
1447 |
|
this.expectedModCount = expectedModCount; |
1449 |
|
|
1450 |
|
private int getFence() { // initialize fence to size on first use |
1451 |
|
int hi; // (a specialized variant appears in method forEach) |
1456 |
– |
ArrayList<E> lst; |
1452 |
|
if ((hi = fence) < 0) { |
1453 |
< |
if ((lst = list) == null) |
1454 |
< |
hi = fence = 0; |
1460 |
< |
else { |
1461 |
< |
expectedModCount = lst.modCount; |
1462 |
< |
hi = fence = lst.size; |
1463 |
< |
} |
1453 |
> |
expectedModCount = modCount; |
1454 |
> |
hi = fence = size; |
1455 |
|
} |
1456 |
|
return hi; |
1457 |
|
} |
1458 |
|
|
1459 |
< |
public ArrayListSpliterator<E> trySplit() { |
1459 |
> |
public ArrayListSpliterator trySplit() { |
1460 |
|
int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; |
1461 |
|
return (lo >= mid) ? null : // divide range in half unless too small |
1462 |
< |
new ArrayListSpliterator<>(list, lo, index = mid, |
1472 |
< |
expectedModCount); |
1462 |
> |
new ArrayListSpliterator(lo, index = mid, expectedModCount); |
1463 |
|
} |
1464 |
|
|
1465 |
|
public boolean tryAdvance(Consumer<? super E> action) { |
1468 |
|
int hi = getFence(), i = index; |
1469 |
|
if (i < hi) { |
1470 |
|
index = i + 1; |
1471 |
< |
@SuppressWarnings("unchecked") E e = (E)list.elementData[i]; |
1471 |
> |
@SuppressWarnings("unchecked") E e = (E)elementData[i]; |
1472 |
|
action.accept(e); |
1473 |
< |
if (list.modCount != expectedModCount) |
1473 |
> |
if (modCount != expectedModCount) |
1474 |
|
throw new ConcurrentModificationException(); |
1475 |
|
return true; |
1476 |
|
} |
1479 |
|
|
1480 |
|
public void forEachRemaining(Consumer<? super E> action) { |
1481 |
|
int i, hi, mc; // hoist accesses and checks from loop |
1482 |
< |
ArrayList<E> lst; Object[] a; |
1482 |
> |
Object[] a; |
1483 |
|
if (action == null) |
1484 |
|
throw new NullPointerException(); |
1485 |
< |
if ((lst = list) != null && (a = lst.elementData) != null) { |
1485 |
> |
if ((a = elementData) != null) { |
1486 |
|
if ((hi = fence) < 0) { |
1487 |
< |
mc = lst.modCount; |
1488 |
< |
hi = lst.size; |
1487 |
> |
mc = modCount; |
1488 |
> |
hi = size; |
1489 |
|
} |
1490 |
|
else |
1491 |
|
mc = expectedModCount; |
1494 |
|
@SuppressWarnings("unchecked") E e = (E) a[i]; |
1495 |
|
action.accept(e); |
1496 |
|
} |
1497 |
< |
if (lst.modCount == mc) |
1497 |
> |
if (modCount == mc) |
1498 |
|
return; |
1499 |
|
} |
1500 |
|
} |
1502 |
|
} |
1503 |
|
|
1504 |
|
public long estimateSize() { |
1505 |
< |
return (long) (getFence() - index); |
1505 |
> |
return getFence() - index; |
1506 |
|
} |
1507 |
|
|
1508 |
|
public int characteristics() { |
1556 |
|
for (i = beg; i < end; i++) |
1557 |
|
if (isClear(deathRow, i - beg)) |
1558 |
|
es[w++] = es[i]; |
1559 |
< |
final int oldSize = size; |
1570 |
< |
System.arraycopy(es, end, es, w, oldSize - end); |
1571 |
< |
Arrays.fill(es, size -= (end - w), oldSize, null); |
1559 |
> |
shiftTailOverGap(es, w, end); |
1560 |
|
// checkInvariants(); |
1561 |
|
return true; |
1562 |
|
} else { |