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root/jsr166/jsr166/src/main/java/util/ArrayList.java

Comparing jsr166/src/main/java/util/ArrayList.java (file contents):
Revision 1.39 by jsr166, Sun Nov 13 02:10:09 2016 UTC vs.
Revision 1.44 by jsr166, Wed Nov 16 00:17:25 2016 UTC

#	Line 501 | Line 501 | public class ArrayList<E> extends Abstra
501		s - index);
502		elementData[index] = element;
503		size = s + 1;
504	+	// checkInvariants();
505		}
506
507		/**
#	Line 524 | Line 525 | public class ArrayList<E> extends Abstra
525		numMoved);
526		elementData[--size] = null; // clear to let GC do its work
527
528	+	// checkInvariants();
529		return oldValue;
530		}
531
#	Line 557 | Line 559 | public class ArrayList<E> extends Abstra
559		return false;
560		}
561
562	<	/*
562	>	/**
563		* Private remove method that skips bounds checking and does not
564		* return the value removed.
565		*/
#	Line 576 | Line 578 | public class ArrayList<E> extends Abstra
578		*/
579		public void clear() {
580		modCount++;
581	<
580	<	// clear to let GC do its work
581	<	for (int i = 0; i < size; i++)
582	<	elementData[i] = null;
583	<
581	>	Arrays.fill(elementData, 0, size, null);
582		size = 0;
583		}
584
#	Line 609 | Line 607 | public class ArrayList<E> extends Abstra
607		elementData = grow(s + numNew);
608		System.arraycopy(a, 0, elementData, s, numNew);
609		size = s + numNew;
610	+	// checkInvariants();
611		return true;
612		}
613
#	Line 647 | Line 646 | public class ArrayList<E> extends Abstra
646		numMoved);
647		System.arraycopy(a, 0, elementData, index, numNew);
648		size = s + numNew;
649	+	// checkInvariants();
650		return true;
651		}
652
#	Line 669 | Line 669 | public class ArrayList<E> extends Abstra
669		outOfBoundsMsg(fromIndex, toIndex));
670		}
671		modCount++;
672	<	int numMoved = size - toIndex;
673	<	System.arraycopy(elementData, toIndex, elementData, fromIndex,
674	<	numMoved);
675	<
676	<	// clear to let GC do its work
677	<	int newSize = size - (toIndex-fromIndex);
678	<	for (int i = newSize; i < size; i++) {
679	<	elementData[i] = null;
680	<	}
681	<	size = newSize;
672	>	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);
676	>	// checkInvariants();
677		}
678
679		/**
#	Line 721 | Line 716 | public class ArrayList<E> extends Abstra
716		* @see Collection#contains(Object)
717		*/
718		public boolean removeAll(Collection<?> c) {
719	<	return batchRemove(c, false);
719	>	return batchRemove(c, false, 0, size);
720		}
721
722		/**
#	Line 741 | Line 736 | public class ArrayList<E> extends Abstra
736		* @see Collection#contains(Object)
737		*/
738		public boolean retainAll(Collection<?> c) {
739	<	return batchRemove(c, true);
739	>	return batchRemove(c, true, 0, size);
740		}
741
742	<	private boolean batchRemove(Collection<?> c, boolean complement) {
742	>	boolean batchRemove(Collection<?> c, boolean complement,
743	>	final int from, final int end) {
744		Objects.requireNonNull(c);
745		final Object[] es = elementData;
750	–	final int end = size;
746		final boolean modified;
747		int r;
748		// Optimize for initial run of survivors
749	<	for (r = 0; r < end && c.contains(es[r]) == complement; r++)
749	>	for (r = from; r < end && c.contains(es[r]) == complement; r++)
750		;
751		if (modified = (r < end)) {
752		int w = r++;
#	Line 766 | Line 761 | public class ArrayList<E> extends Abstra
761		w += end - r;
762		throw ex;
763		} finally {
764	<	modCount += end - w;
765	<	Arrays.fill(es, size = w, end, null);
764	>	final int oldSize = size, deleted = end - w;
765	>	modCount += deleted;
766	>	System.arraycopy(es, end, es, w, oldSize - end);
767	>	Arrays.fill(es, size -= deleted, oldSize, null);
768		}
769		}
770	+	// checkInvariants();
771		return modified;
772		}
773
#	Line 914 | Line 912 | public class ArrayList<E> extends Abstra
912		}
913
914		@Override
915	<	@SuppressWarnings("unchecked")
916	<	public void forEachRemaining(Consumer<? super E> consumer) {
919	<	Objects.requireNonNull(consumer);
915	>	public void forEachRemaining(Consumer<? super E> action) {
916	>	Objects.requireNonNull(action);
917		final int size = ArrayList.this.size;
918		int i = cursor;
919	<	if (i >= size) {
920	<	return;
921	<	}
922	<	final Object[] elementData = ArrayList.this.elementData;
923	<	if (i >= elementData.length) {
924	<	throw new ConcurrentModificationException();
925	<	}
926	<	while (i != size && modCount == expectedModCount) {
927	<	consumer.accept((E) elementData[i++]);
919	>	if (i < size) {
920	>	final Object[] es = elementData;
921	>	if (i >= es.length)
922	>	throw new ConcurrentModificationException();
923	>	for (; i < size && modCount == expectedModCount; i++)
924	>	action.accept(elementAt(es, i));
925	>	// update once at end to reduce heap write traffic
926	>	cursor = i;
927	>	lastRet = i - 1;
928	>	checkForComodification();
929		}
932	–	// update once at end of iteration to reduce heap write traffic
933	–	cursor = i;
934	–	lastRet = i - 1;
935	–	checkForComodification();
930		}
931
932		final void checkForComodification() {
#	Line 1119 | Line 1113 | public class ArrayList<E> extends Abstra
1113		return true;
1114		}
1115
1116	+	public boolean removeAll(Collection<?> c) {
1117	+	return batchRemove(c, false);
1118	+	}
1119	+
1120	+	public boolean retainAll(Collection<?> c) {
1121	+	return batchRemove(c, true);
1122	+	}
1123	+
1124	+	private boolean batchRemove(Collection<?> c, boolean complement) {
1125	+	checkForComodification();
1126	+	int oldSize = root.size;
1127	+	boolean modified =
1128	+	root.batchRemove(c, complement, offset, offset + size);
1129	+	if (modified)
1130	+	updateSizeAndModCount(root.size - oldSize);
1131	+	return modified;
1132	+	}
1133	+
1134	+	public boolean removeIf(Predicate<? super E> filter) {
1135	+	checkForComodification();
1136	+	int oldSize = root.size;
1137	+	boolean modified = root.removeIf(filter, offset, offset + size);
1138	+	if (modified)
1139	+	updateSizeAndModCount(root.size - oldSize);
1140	+	return modified;
1141	+	}
1142	+
1143		public Iterator<E> iterator() {
1144		return listIterator();
1145		}
#	Line 1166 | Line 1187 | public class ArrayList<E> extends Abstra
1187		return (E) elementData[offset + (lastRet = i)];
1188		}
1189
1190	<	@SuppressWarnings("unchecked")
1191	<	public void forEachRemaining(Consumer<? super E> consumer) {
1171	<	Objects.requireNonNull(consumer);
1190	>	public void forEachRemaining(Consumer<? super E> action) {
1191	>	Objects.requireNonNull(action);
1192		final int size = SubList.this.size;
1193		int i = cursor;
1194	<	if (i >= size) {
1195	<	return;
1196	<	}
1197	<	final Object[] elementData = root.elementData;
1198	<	if (offset + i >= elementData.length) {
1199	<	throw new ConcurrentModificationException();
1200	<	}
1201	<	while (i != size && modCount == expectedModCount) {
1202	<	consumer.accept((E) elementData[offset + (i++)]);
1194	>	if (i < size) {
1195	>	final Object[] es = root.elementData;
1196	>	if (offset + i >= es.length)
1197	>	throw new ConcurrentModificationException();
1198	>	for (; i < size && modCount == expectedModCount; i++)
1199	>	action.accept(elementAt(es, offset + i));
1200	>	// update once at end to reduce heap write traffic
1201	>	cursor = i;
1202	>	lastRet = i - 1;
1203	>	checkForComodification();
1204		}
1184	–	// update once at end of iteration to reduce heap write traffic
1185	–	lastRet = cursor = i;
1186	–	checkForComodification();
1205		}
1206
1207		public int nextIndex() {
#	Line 1352 | Line 1370 | public class ArrayList<E> extends Abstra
1370		final int expectedModCount = modCount;
1371		final Object[] es = elementData;
1372		final int size = this.size;
1373	<	for (int i = 0; modCount == expectedModCount && i < size; i++) {
1373	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1374		action.accept(elementAt(es, i));
1375	<	}
1358	<	if (modCount != expectedModCount) {
1375	>	if (modCount != expectedModCount)
1376		throw new ConcurrentModificationException();
1360	–	}
1377		}
1378
1379		/**
#	Line 1418 | Line 1434 | public class ArrayList<E> extends Abstra
1434		private int fence; // -1 until used; then one past last index
1435		private int expectedModCount; // initialized when fence set
1436
1437	<	/** Create new spliterator covering the given  range */
1437	>	/** Create new spliterator covering the given range */
1438		ArrayListSpliterator(ArrayList<E> list, int origin, int fence,
1439		int expectedModCount) {
1440		this.list = list; // OK if null unless traversed
#	Line 1509 | Line 1525 | public class ArrayList<E> extends Abstra
1525		}
1526
1527		@Override
1528	<	public boolean removeIf(Predicate<? super E> filter) {
1528	>	public boolean removeIf(Predicate<? super E> filter) {
1529	>	return removeIf(filter, 0, size);
1530	>	}
1531	>
1532	>	/**
1533	>	* Removes all elements satisfying the given predicate, from index
1534	>	* i (inclusive) to index end (exclusive).
1535	>	*/
1536	>	boolean removeIf(Predicate<? super E> filter, int i, final int end) {
1537		Objects.requireNonNull(filter);
1538		int expectedModCount = modCount;
1539		final Object[] es = elementData;
1516	–	final int end = size;
1517	–	final boolean modified;
1518	–	int i;
1540		// Optimize for initial run of survivors
1541	<	for (i = 0; i < end && !filter.test(elementAt(es, i)); i++)
1541	>	for (; i < end && !filter.test(elementAt(es, i)); i++)
1542		;
1543		// Tolerate predicates that reentrantly access the collection for
1544		// read (but writers still get CME), so traverse once to find
1545		// elements to delete, a second pass to physically expunge.
1546	<	if (modified = (i < end)) {
1526	<	expectedModCount++;
1527	<	modCount++;
1546	>	if (i < end) {
1547		final int beg = i;
1548		final long[] deathRow = nBits(end - beg);
1549		deathRow[0] = 1L;   // set bit 0
1550		for (i = beg + 1; i < end; i++)
1551		if (filter.test(elementAt(es, i)))
1552		setBit(deathRow, i - beg);
1553	+	if (modCount != expectedModCount)
1554	+	throw new ConcurrentModificationException();
1555	+	expectedModCount++;
1556	+	modCount++;
1557		int w = beg;
1558		for (i = beg; i < end; i++)
1559		if (isClear(deathRow, i - beg))
1560		es[w++] = es[i];
1561	<	Arrays.fill(es, size = w, end, null);
1561	>	final int oldSize = size;
1562	>	System.arraycopy(es, end, es, w, oldSize - end);
1563	>	Arrays.fill(es, size -= (end - w), oldSize, null);
1564	>	// checkInvariants();
1565	>	return true;
1566	>	} else {
1567	>	if (modCount != expectedModCount)
1568	>	throw new ConcurrentModificationException();
1569	>	// checkInvariants();
1570	>	return false;
1571		}
1540	–	if (modCount != expectedModCount)
1541	–	throw new ConcurrentModificationException();
1542	–	return modified;
1572		}
1573
1574		@Override
#	Line 1548 | Line 1577 | public class ArrayList<E> extends Abstra
1577		final int expectedModCount = modCount;
1578		final Object[] es = elementData;
1579		final int size = this.size;
1580	<	for (int i=0; modCount == expectedModCount && i < size; i++) {
1580	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1581		es[i] = operator.apply(elementAt(es, i));
1582	<	}
1554	<	if (modCount != expectedModCount) {
1582	>	if (modCount != expectedModCount)
1583		throw new ConcurrentModificationException();
1556	–	}
1584		modCount++;
1585	+	// checkInvariants();
1586		}
1587
1588		@Override
#	Line 1562 | Line 1590 | public class ArrayList<E> extends Abstra
1590		public void sort(Comparator<? super E> c) {
1591		final int expectedModCount = modCount;
1592		Arrays.sort((E[]) elementData, 0, size, c);
1593	<	if (modCount != expectedModCount) {
1593	>	if (modCount != expectedModCount)
1594		throw new ConcurrentModificationException();
1567	–	}
1595		modCount++;
1596	+	// checkInvariants();
1597	+	}
1598	+
1599	+	void checkInvariants() {
1600	+	// assert size >= 0;
1601	+	// assert size == elementData.length || elementData[size] == null;
1602		}
1603		}

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