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

Comparing jsr166/src/main/java/util/Vector.java (file contents):
Revision 1.32 by jsr166, Sat Nov 12 20:51:59 2016 UTC vs.
Revision 1.35 by jsr166, Sun Nov 13 21:07:40 2016 UTC

#	Line 585 | Line 585 | public class Vector<E>
585		modCount++;
586		elementCount--;
587		elementData[elementCount] = null; /* to let gc do its work */
588	+	// checkInvariants();
589		}
590
591		/**
#	Line 675 | Line 676 | public class Vector<E>
676		* method (which is part of the {@link List} interface).
677		*/
678		public synchronized void removeAllElements() {
679	<	// Let gc do its work
679	<	for (int i = 0; i < elementCount; i++)
680	<	elementData[i] = null;
681	<
679	>	Arrays.fill(elementData, 0, elementCount, null);
680		modCount++;
681		elementCount = 0;
682		}
#	Line 693 | Line 691 | public class Vector<E>
691		public synchronized Object clone() {
692		try {
693		@SuppressWarnings("unchecked")
694	<	Vector<E> v = (Vector<E>) super.clone();
694	>	Vector<E> v = (Vector<E>) super.clone();
695		v.elementData = Arrays.copyOf(elementData, elementCount);
696		v.modCount = 0;
697		return v;
#	Line 759 | Line 757 | public class Vector<E>
757		return (E) elementData[index];
758		}
759
760	+	@SuppressWarnings("unchecked")
761	+	static <E> E elementAt(Object[] es, int index) {
762	+	return (E) es[index];
763	+	}
764	+
765		/**
766		* Returns the element at the specified position in this Vector.
767		*
#	Line 805 | Line 808 | public class Vector<E>
808		elementData = grow();
809		elementData[s] = e;
810		elementCount = s + 1;
811	+	// checkInvariants();
812		}
813
814		/**
#	Line 873 | Line 877 | public class Vector<E>
877		numMoved);
878		elementData[--elementCount] = null; // Let gc do its work
879
880	+	// checkInvariants();
881		return oldValue;
882		}
883
#	Line 928 | Line 933 | public class Vector<E>
933		elementData = grow(s + numNew);
934		System.arraycopy(a, 0, elementData, s, numNew);
935		elementCount = s + numNew;
936	+	// checkInvariants();
937		return true;
938		}
939		}
#	Line 984 | Line 990 | public class Vector<E>
990		return bulkRemove(filter);
991		}
992
993	<	@SuppressWarnings("unchecked")
993	>	// A tiny bit set implementation
994	>
995	>	private static long[] nBits(int n) {
996	>	return new long[((n - 1) >> 6) + 1];
997	>	}
998	>	private static void setBit(long[] bits, int i) {
999	>	bits[i >> 6] |= 1L << i;
1000	>	}
1001	>	private static boolean isClear(long[] bits, int i) {
1002	>	return (bits[i >> 6] & (1L << i)) == 0;
1003	>	}
1004	>
1005		private synchronized boolean bulkRemove(Predicate<? super E> filter) {
1006		int expectedModCount = modCount;
1007		final Object[] es = elementData;
1008	<	final int size = elementCount;
1008	>	final int end = elementCount;
1009		final boolean modified;
1010	<	int r;
1010	>	int i;
1011		// Optimize for initial run of survivors
1012	<	for (r = 0; r < size && !filter.test((E) es[r]); r++)
1012	>	for (i = 0; i < end && !filter.test(elementAt(es, i)); i++)
1013		;
1014	<	if (modified = (r < size)) {
1014	>	// Tolerate predicates that reentrantly access the collection for
1015	>	// read (but writers still get CME), so traverse once to find
1016	>	// elements to delete, a second pass to physically expunge.
1017	>	if (modified = (i < end)) {
1018		expectedModCount++;
1019		modCount++;
1020	<	int w = r++;
1021	<	try {
1022	<	for (E e; r < size; r++)
1023	<	if (!filter.test(e = (E) es[r]))
1024	<	es[w++] = e;
1025	<	} catch (Throwable ex) {
1026	<	// copy remaining elements
1027	<	System.arraycopy(es, r, es, w, size - r);
1028	<	w += size - r;
1029	<	throw ex;
1030	<	} finally {
1011	<	Arrays.fill(es, elementCount = w, size, null);
1012	<	}
1020	>	final int beg = i;
1021	>	final long[] deathRow = nBits(end - beg);
1022	>	deathRow[0] = 1L;   // set bit 0
1023	>	for (i = beg + 1; i < end; i++)
1024	>	if (filter.test(elementAt(es, i)))
1025	>	setBit(deathRow, i - beg);
1026	>	int w = beg;
1027	>	for (i = beg; i < end; i++)
1028	>	if (isClear(deathRow, i - beg))
1029	>	es[w++] = es[i];
1030	>	Arrays.fill(es, elementCount = w, end, null);
1031		}
1032		if (modCount != expectedModCount)
1033		throw new ConcurrentModificationException();
1034	+	// checkInvariants();
1035		return modified;
1036		}
1037
#	Line 1054 | Line 1073 | public class Vector<E>
1073		numMoved);
1074		System.arraycopy(a, 0, elementData, index, numNew);
1075		elementCount = s + numNew;
1076	+	// checkInvariants();
1077		return true;
1078		}
1079
#	Line 1135 | Line 1155 | public class Vector<E>
1155		* (If {@code toIndex==fromIndex}, this operation has no effect.)
1156		*/
1157		protected synchronized void removeRange(int fromIndex, int toIndex) {
1158	<	int numMoved = elementCount - toIndex;
1159	<	System.arraycopy(elementData, toIndex, elementData, fromIndex,
1160	<	numMoved);
1161	<
1162	<	// Let gc do its work
1163	<	modCount++;
1164	<	int newElementCount = elementCount - (toIndex-fromIndex);
1145	<	while (elementCount != newElementCount)
1146	<	elementData[--elementCount] = null;
1158	>	final Object[] es = elementData;
1159	>	final int oldSize = elementCount;
1160	>	System.arraycopy(es, toIndex, es, fromIndex, oldSize - toIndex);
1161	>
1162	>	modCount++;
1163	>	Arrays.fill(es, elementCount -= (toIndex - fromIndex), oldSize, null);
1164	>	// checkInvariants();
1165		}
1166
1167		/**
#	Line 1252 | Line 1270 | public class Vector<E>
1270		if (i >= size) {
1271		return;
1272		}
1273	<	@SuppressWarnings("unchecked")
1274	<	final E[] elementData = (E[]) Vector.this.elementData;
1257	<	if (i >= elementData.length) {
1273	>	final Object[] es = elementData;
1274	>	if (i >= es.length)
1275		throw new ConcurrentModificationException();
1276	<	}
1277	<	while (i != size && modCount == expectedModCount) {
1261	<	action.accept(elementData[i++]);
1262	<	}
1276	>	while (i < size && modCount == expectedModCount)
1277	>	action.accept(elementAt(es, i++));
1278		// update once at end of iteration to reduce heap write traffic
1279		cursor = i;
1280		lastRet = i - 1;
#	Line 1330 | Line 1345 | public class Vector<E>
1345		public synchronized void forEach(Consumer<? super E> action) {
1346		Objects.requireNonNull(action);
1347		final int expectedModCount = modCount;
1348	<	@SuppressWarnings("unchecked")
1349	<	final E[] elementData = (E[]) this.elementData;
1350	<	final int elementCount = this.elementCount;
1351	<	for (int i=0; modCount == expectedModCount && i < elementCount; i++) {
1352	<	action.accept(elementData[i]);
1338	<	}
1339	<	if (modCount != expectedModCount) {
1348	>	final Object[] es = elementData;
1349	>	final int size = elementCount;
1350	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1351	>	action.accept(elementAt(es, i));
1352	>	if (modCount != expectedModCount)
1353		throw new ConcurrentModificationException();
1354	<	}
1354	>	// checkInvariants();
1355		}
1356
1357		@Override
1345	–	@SuppressWarnings("unchecked")
1358		public synchronized void replaceAll(UnaryOperator<E> operator) {
1359		Objects.requireNonNull(operator);
1360		final int expectedModCount = modCount;
1361	+	final Object[] es = elementData;
1362		final int size = elementCount;
1363	<	for (int i=0; modCount == expectedModCount && i < size; i++) {
1364	<	elementData[i] = operator.apply((E) elementData[i]);
1365	<	}
1353	<	if (modCount != expectedModCount) {
1363	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1364	>	es[i] = operator.apply(elementAt(es, i));
1365	>	if (modCount != expectedModCount)
1366		throw new ConcurrentModificationException();
1355	–	}
1367		modCount++;
1368	+	// checkInvariants();
1369		}
1370
1371		@SuppressWarnings("unchecked")
#	Line 1361 | Line 1373 | public class Vector<E>
1373		public synchronized void sort(Comparator<? super E> c) {
1374		final int expectedModCount = modCount;
1375		Arrays.sort((E[]) elementData, 0, elementCount, c);
1376	<	if (modCount != expectedModCount) {
1376	>	if (modCount != expectedModCount)
1377		throw new ConcurrentModificationException();
1366	–	}
1378		modCount++;
1379	+	// checkInvariants();
1380		}
1381
1382		/**
#	Line 1393 | Line 1405 | public class Vector<E>
1405		private int fence; // -1 until used; then one past last index
1406		private int expectedModCount; // initialized when fence set
1407
1408	<	/** Create new spliterator covering the given  range */
1408	>	/** Create new spliterator covering the given range */
1409		VectorSpliterator(Vector<E> list, Object[] array, int origin, int fence,
1410		int expectedModCount) {
1411		this.list = list;
#	Line 1471 | Line 1483 | public class Vector<E>
1483		return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;
1484		}
1485		}
1486	+
1487	+	void checkInvariants() {
1488	+	// assert elementCount >= 0;
1489	+	// assert elementCount == elementData.length || elementData[elementCount] == null;
1490	+	}
1491		}

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