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

Comparing jsr166/src/main/java/util/ArrayList.java (file contents):
Revision 1.37 by jsr166, Fri Nov 4 03:09:27 2016 UTC vs.
Revision 1.49 by jsr166, Wed Dec 21 05:15:36 2016 UTC

#	Line 423 | Line 423 | public class ArrayList<E> extends Abstra
423		return (E) elementData[index];
424		}
425
426	+	@SuppressWarnings("unchecked")
427	+	static <E> E elementAt(Object[] es, int index) {
428	+	return (E) es[index];
429	+	}
430	+
431		/**
432		* Returns the element at the specified position in this list.
433		*
#	Line 496 | 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 519 | 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 552 | 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 571 | Line 578 | public class ArrayList<E> extends Abstra
578		*/
579		public void clear() {
580		modCount++;
581	<
582	<	// clear to let GC do its work
583	<	for (int i = 0; i < size; i++)
577	<	elementData[i] = null;
578	<
579	<	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		/**
#	Line 604 | Line 608 | public class ArrayList<E> extends Abstra
608		elementData = grow(s + numNew);
609		System.arraycopy(a, 0, elementData, s, numNew);
610		size = s + numNew;
611	+	// checkInvariants();
612		return true;
613		}
614
#	Line 642 | Line 647 | public class ArrayList<E> extends Abstra
647		numMoved);
648		System.arraycopy(a, 0, elementData, index, numNew);
649		size = s + numNew;
650	+	// checkInvariants();
651		return true;
652		}
653
#	Line 664 | Line 670 | public class ArrayList<E> extends Abstra
670		outOfBoundsMsg(fromIndex, toIndex));
671		}
672		modCount++;
673	<	int numMoved = size - toIndex;
674	<	System.arraycopy(elementData, toIndex, elementData, fromIndex,
675	<	numMoved);
676	<
677	<	// clear to let GC do its work
678	<	int newSize = size - (toIndex-fromIndex);
679	<	for (int i = newSize; i < size; i++) {
680	<	elementData[i] = null;
681	<	}
676	<	size = newSize;
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		/**
#	Line 716 | Line 721 | public class ArrayList<E> extends Abstra
721		* @see Collection#contains(Object)
722		*/
723		public boolean removeAll(Collection<?> c) {
724	<	return batchRemove(c, false);
724	>	return batchRemove(c, false, 0, size);
725		}
726
727		/**
#	Line 736 | Line 741 | public class ArrayList<E> extends Abstra
741		* @see Collection#contains(Object)
742		*/
743		public boolean retainAll(Collection<?> c) {
744	<	return batchRemove(c, true);
744	>	return batchRemove(c, true, 0, size);
745		}
746
747	<	private boolean batchRemove(Collection<?> c, boolean complement) {
747	>	boolean batchRemove(Collection<?> c, boolean complement,
748	>	final int from, final int end) {
749		Objects.requireNonNull(c);
750		final Object[] es = elementData;
745	–	final int size = this.size;
751		final boolean modified;
752		int r;
753		// Optimize for initial run of survivors
754	<	for (r = 0; r < size; r++)
755	<	if (c.contains(es[r]) != complement)
756	<	break;
752	<	if (modified = (r < size)) {
754	>	for (r = from; r < end && c.contains(es[r]) == complement; r++)
755	>	;
756	>	if (modified = (r < end)) {
757		int w = r++;
758		try {
759	<	for (Object e; r < size; r++)
759	>	for (Object e; r < end; r++)
760		if (c.contains(e = es[r]) == complement)
761		es[w++] = e;
762		} catch (Throwable ex) {
763		// Preserve behavioral compatibility with AbstractCollection,
764		// even if c.contains() throws.
765	<	System.arraycopy(es, r, es, w, size - r);
766	<	w += size - r;
765	>	System.arraycopy(es, r, es, w, end - r);
766	>	w += end - r;
767		throw ex;
768		} finally {
769	<	modCount += size - w;
770	<	Arrays.fill(es, (this.size = w), size, null);
769	>	modCount += end - w;
770	>	shiftTailOverGap(es, w, end);
771		}
772		}
773	+	// checkInvariants();
774		return modified;
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();
#	Line 797 | Line 804 | public class ArrayList<E> extends Abstra
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 {
#	Line 910 | Line 921 | public class ArrayList<E> extends Abstra
921		}
922
923		@Override
924	<	@SuppressWarnings("unchecked")
925	<	public void forEachRemaining(Consumer<? super E> consumer) {
915	<	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		}
928	–	// update once at end of iteration to reduce heap write traffic
929	–	cursor = i;
930	–	lastRet = i - 1;
931	–	checkForComodification();
939		}
940
941		final void checkForComodification() {
#	Line 1115 | Line 1122 | public class ArrayList<E> extends Abstra
1122		return true;
1123		}
1124
1125	+	public boolean removeAll(Collection<?> c) {
1126	+	return batchRemove(c, false);
1127	+	}
1128	+
1129	+	public boolean retainAll(Collection<?> c) {
1130	+	return batchRemove(c, true);
1131	+	}
1132	+
1133	+	private boolean batchRemove(Collection<?> c, boolean complement) {
1134	+	checkForComodification();
1135	+	int oldSize = root.size;
1136	+	boolean modified =
1137	+	root.batchRemove(c, complement, offset, offset + size);
1138	+	if (modified)
1139	+	updateSizeAndModCount(root.size - oldSize);
1140	+	return modified;
1141	+	}
1142	+
1143	+	public boolean removeIf(Predicate<? super E> filter) {
1144	+	checkForComodification();
1145	+	int oldSize = root.size;
1146	+	boolean modified = root.removeIf(filter, offset, offset + size);
1147	+	if (modified)
1148	+	updateSizeAndModCount(root.size - oldSize);
1149	+	return modified;
1150	+	}
1151	+
1152		public Iterator<E> iterator() {
1153		return listIterator();
1154		}
#	Line 1162 | Line 1196 | public class ArrayList<E> extends Abstra
1196		return (E) elementData[offset + (lastRet = i)];
1197		}
1198
1199	<	@SuppressWarnings("unchecked")
1200	<	public void forEachRemaining(Consumer<? super E> consumer) {
1167	<	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		}
1180	–	// update once at end of iteration to reduce heap write traffic
1181	–	lastRet = cursor = i;
1182	–	checkForComodification();
1214		}
1215
1216		public int nextIndex() {
#	Line 1269 | Line 1300 | public class ArrayList<E> extends Abstra
1300		public Spliterator<E> spliterator() {
1301		checkForComodification();
1302
1303	<	// ArrayListSpliterator is not used because late-binding logic
1304	<	// is different here
1274	<	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
#	Line 1285 | Line 1315 | public class ArrayList<E> extends Abstra
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,
1293	<	expectedModCount);
1322	>	root.new ArrayListSpliterator(lo, index = mid, expectedModCount);
1323		}
1324
1325		public boolean tryAdvance(Consumer<? super E> action) {
#	Line 1332 | Line 1361 | public class ArrayList<E> extends Abstra
1361		}
1362
1363		public long estimateSize() {
1364	<	return (long) (getFence() - index);
1364	>	return getFence() - index;
1365		}
1366
1367		public int characteristics() {
#	Line 1342 | Line 1371 | public class ArrayList<E> extends Abstra
1371		}
1372		}
1373
1374	+	/**
1375	+	* @throws NullPointerException {@inheritDoc}
1376	+	*/
1377		@Override
1378		public void forEach(Consumer<? super E> action) {
1379		Objects.requireNonNull(action);
1380		final int expectedModCount = modCount;
1381	<	@SuppressWarnings("unchecked")
1350	<	final E[] elementData = (E[]) this.elementData;
1381	>	final Object[] es = elementData;
1382		final int size = this.size;
1383	<	for (int i=0; modCount == expectedModCount && i < size; i++) {
1384	<	action.accept(elementData[i]);
1385	<	}
1355	<	if (modCount != expectedModCount) {
1383	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1384	>	action.accept(elementAt(es, i));
1385	>	if (modCount != expectedModCount)
1386		throw new ConcurrentModificationException();
1357	–	}
1387		}
1388
1389		/**
#	Line 1372 | Line 1401 | public class ArrayList<E> extends Abstra
1401		*/
1402		@Override
1403		public Spliterator<E> spliterator() {
1404	<	return new ArrayListSpliterator<>(this, 0, -1, 0);
1404	>	return new ArrayListSpliterator(0, -1, 0);
1405		}
1406
1407		/** Index-based split-by-two, lazily initialized Spliterator */
1408	<	static final class ArrayListSpliterator<E> implements Spliterator<E> {
1408	>	final class ArrayListSpliterator implements Spliterator<E> {
1409
1410		/*
1411		* If ArrayLists were immutable, or structurally immutable (no
#	Line 1410 | Line 1439 | public class ArrayList<E> extends Abstra
1439		* these streamlinings.
1440		*/
1441
1413	–	private final ArrayList<E> list;
1442		private int index; // current index, modified on advance/split
1443		private int fence; // -1 until used; then one past last index
1444		private int expectedModCount; // initialized when fence set
1445
1446	<	/** Create new spliterator covering the given  range */
1447	<	ArrayListSpliterator(ArrayList<E> list, int origin, int fence,
1420	<	int expectedModCount) {
1421	<	this.list = list; // OK if null unless traversed
1446	>	/** Creates new spliterator covering the given range. */
1447	>	ArrayListSpliterator(int origin, int fence, int expectedModCount) {
1448		this.index = origin;
1449		this.fence = fence;
1450		this.expectedModCount = expectedModCount;
#	Line 1426 | Line 1452 | public class ArrayList<E> extends Abstra
1452
1453		private int getFence() { // initialize fence to size on first use
1454		int hi; // (a specialized variant appears in method forEach)
1429	–	ArrayList<E> lst;
1455		if ((hi = fence) < 0) {
1456	<	if ((lst = list) == null)
1457	<	hi = fence = 0;
1433	<	else {
1434	<	expectedModCount = lst.modCount;
1435	<	hi = fence = lst.size;
1436	<	}
1456	>	expectedModCount = modCount;
1457	>	hi = fence = size;
1458		}
1459		return hi;
1460		}
1461
1462	<	public ArrayListSpliterator<E> trySplit() {
1462	>	public ArrayListSpliterator trySplit() {
1463		int hi = getFence(), lo = index, mid = (lo + hi) >>> 1;
1464		return (lo >= mid) ? null : // divide range in half unless too small
1465	<	new ArrayListSpliterator<>(list, lo, index = mid,
1445	<	expectedModCount);
1465	>	new ArrayListSpliterator(lo, index = mid, expectedModCount);
1466		}
1467
1468		public boolean tryAdvance(Consumer<? super E> action) {
#	Line 1451 | Line 1471 | public class ArrayList<E> extends Abstra
1471		int hi = getFence(), i = index;
1472		if (i < hi) {
1473		index = i + 1;
1474	<	@SuppressWarnings("unchecked") E e = (E)list.elementData[i];
1474	>	@SuppressWarnings("unchecked") E e = (E)elementData[i];
1475		action.accept(e);
1476	<	if (list.modCount != expectedModCount)
1476	>	if (modCount != expectedModCount)
1477		throw new ConcurrentModificationException();
1478		return true;
1479		}
#	Line 1462 | Line 1482 | public class ArrayList<E> extends Abstra
1482
1483		public void forEachRemaining(Consumer<? super E> action) {
1484		int i, hi, mc; // hoist accesses and checks from loop
1485	<	ArrayList<E> lst; Object[] a;
1485	>	Object[] a;
1486		if (action == null)
1487		throw new NullPointerException();
1488	<	if ((lst = list) != null && (a = lst.elementData) != null) {
1488	>	if ((a = elementData) != null) {
1489		if ((hi = fence) < 0) {
1490	<	mc = lst.modCount;
1491	<	hi = lst.size;
1490	>	mc = modCount;
1491	>	hi = size;
1492		}
1493		else
1494		mc = expectedModCount;
#	Line 1477 | Line 1497 | public class ArrayList<E> extends Abstra
1497		@SuppressWarnings("unchecked") E e = (E) a[i];
1498		action.accept(e);
1499		}
1500	<	if (lst.modCount == mc)
1500	>	if (modCount == mc)
1501		return;
1502		}
1503		}
#	Line 1485 | Line 1505 | public class ArrayList<E> extends Abstra
1505		}
1506
1507		public long estimateSize() {
1508	<	return (long) (getFence() - index);
1508	>	return getFence() - index;
1509		}
1510
1511		public int characteristics() {
#	Line 1493 | Line 1513 | public class ArrayList<E> extends Abstra
1513		}
1514		}
1515
1516	<	@SuppressWarnings("unchecked")
1516	>	// A tiny bit set implementation
1517	>
1518	>	private static long[] nBits(int n) {
1519	>	return new long[((n - 1) >> 6) + 1];
1520	>	}
1521	>	private static void setBit(long[] bits, int i) {
1522	>	bits[i >> 6] |= 1L << i;
1523	>	}
1524	>	private static boolean isClear(long[] bits, int i) {
1525	>	return (bits[i >> 6] & (1L << i)) == 0;
1526	>	}
1527	>
1528	>	/**
1529	>	* @throws NullPointerException {@inheritDoc}
1530	>	*/
1531		@Override
1532		public boolean removeIf(Predicate<? super E> filter) {
1533	+	return removeIf(filter, 0, size);
1534	+	}
1535	+
1536	+	/**
1537	+	* Removes all elements satisfying the given predicate, from index
1538	+	* i (inclusive) to index end (exclusive).
1539	+	*/
1540	+	boolean removeIf(Predicate<? super E> filter, int i, final int end) {
1541		Objects.requireNonNull(filter);
1542		int expectedModCount = modCount;
1543		final Object[] es = elementData;
1502	–	final int size = this.size;
1503	–	final boolean modified;
1504	–	int r;
1544		// Optimize for initial run of survivors
1545	<	for (r = 0; r < size; r++)
1546	<	if (filter.test((E) es[r]))
1547	<	break;
1548	<	if (modified = (r < size)) {
1545	>	for (; i < end && !filter.test(elementAt(es, i)); i++)
1546	>	;
1547	>	// Tolerate predicates that reentrantly access the collection for
1548	>	// read (but writers still get CME), so traverse once to find
1549	>	// elements to delete, a second pass to physically expunge.
1550	>	if (i < end) {
1551	>	final int beg = i;
1552	>	final long[] deathRow = nBits(end - beg);
1553	>	deathRow[0] = 1L;   // set bit 0
1554	>	for (i = beg + 1; i < end; i++)
1555	>	if (filter.test(elementAt(es, i)))
1556	>	setBit(deathRow, i - beg);
1557	>	if (modCount != expectedModCount)
1558	>	throw new ConcurrentModificationException();
1559		expectedModCount++;
1560		modCount++;
1561	<	int w = r++;
1562	<	try {
1563	<	for (E e; r < size; r++)
1564	<	if (!filter.test(e = (E) es[r]))
1565	<	es[w++] = e;
1566	<	} catch (Throwable ex) {
1567	<	// copy remaining elements
1568	<	System.arraycopy(es, r, es, w, size - r);
1569	<	w += size - r;
1570	<	throw ex;
1571	<	} finally {
1572	<	Arrays.fill(es, (this.size = w), size, null);
1524	<	}
1561	>	int w = beg;
1562	>	for (i = beg; i < end; i++)
1563	>	if (isClear(deathRow, i - beg))
1564	>	es[w++] = es[i];
1565	>	shiftTailOverGap(es, w, end);
1566	>	// checkInvariants();
1567	>	return true;
1568	>	} else {
1569	>	if (modCount != expectedModCount)
1570	>	throw new ConcurrentModificationException();
1571	>	// checkInvariants();
1572	>	return false;
1573		}
1526	–	if (modCount != expectedModCount)
1527	–	throw new ConcurrentModificationException();
1528	–	return modified;
1574		}
1575
1576		@Override
1532	–	@SuppressWarnings("unchecked")
1577		public void replaceAll(UnaryOperator<E> operator) {
1578		Objects.requireNonNull(operator);
1579		final int expectedModCount = modCount;
1580	+	final Object[] es = elementData;
1581		final int size = this.size;
1582	<	for (int i=0; modCount == expectedModCount && i < size; i++) {
1583	<	elementData[i] = operator.apply((E) elementData[i]);
1584	<	}
1540	<	if (modCount != expectedModCount) {
1582	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1583	>	es[i] = operator.apply(elementAt(es, i));
1584	>	if (modCount != expectedModCount)
1585		throw new ConcurrentModificationException();
1542	–	}
1586		modCount++;
1587	+	// checkInvariants();
1588		}
1589
1590		@Override
#	Line 1548 | Line 1592 | public class ArrayList<E> extends Abstra
1592		public void sort(Comparator<? super E> c) {
1593		final int expectedModCount = modCount;
1594		Arrays.sort((E[]) elementData, 0, size, c);
1595	<	if (modCount != expectedModCount) {
1595	>	if (modCount != expectedModCount)
1596		throw new ConcurrentModificationException();
1553	–	}
1597		modCount++;
1598	+	// checkInvariants();
1599	+	}
1600	+
1601	+	void checkInvariants() {
1602	+	// assert size >= 0;
1603	+	// assert size == elementData.length || elementData[size] == null;
1604		}
1605		}

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