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root/jsr166/jsr166/src/jsr166e/extra/ReadMostlyVector.java

Comparing jsr166/src/jsr166e/extra/ReadMostlyVector.java (file contents):
Revision 1.13 by jsr166, Fri Aug 5 17:08:04 2011 UTC vs.
Revision 1.22 by jsr166, Sat Dec 31 21:16:14 2011 UTC

#	Line 32 | Line 32 | import java.util.*;
32		*
33		* @author Doug Lea
34		*/
35	<	public class ReadMostlyVector<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable {
35	>	public class ReadMostlyVector<E>
36	>	implements List<E>, RandomAccess, Cloneable, java.io.Serializable {
37		private static final long serialVersionUID = 8673264195747942595L;
38
39		/*
#	Line 48 | Line 49 | public class ReadMostlyVector<E> impleme
49		* read-only mode, and then lock. When in read-only mode, they
50		* validate only at the end of an array scan unless the element is
51		* actually used (for example, as an argument of method equals).
52	+	*
53	+	* We rely on some invariants that are always true, even for field
54	+	* reads in read-only mode that have not yet been validated:
55	+	* - array != null
56	+	* - count >= 0
57		*/
58
59		/**
#	Line 199 | Line 205 | public class ReadMostlyVector<E> impleme
205		return -1;
206		}
207
208	<	final void rawAdd(Object e) {
208	>	final void rawAdd(E e) {
209		int n = count;
210		Object[] items = array;
211		if (n >= items.length)
#	Line 208 | Line 214 | public class ReadMostlyVector<E> impleme
214		count = n + 1;
215		}
216
217	<	final void rawAddAt(int index, Object e) {
217	>	final void rawAddAt(int index, E e) {
218		int n = count;
219		Object[] items = array;
220		if (index > n)
#	Line 261 | Line 267 | public class ReadMostlyVector<E> impleme
267		* field under lock.
268		*/
269		final boolean internalRemoveAll(Collection<?> c, int origin, int bound) {
270	<	SequenceLock lock = this.lock;
270	>	final SequenceLock lock = this.lock;
271		boolean removed = false;
272		lock.lock();
273		try {
#	Line 280 | Line 286 | public class ReadMostlyVector<E> impleme
286		}
287
288		final boolean internalRetainAll(Collection<?> c, int origin, int bound) {
289	<	SequenceLock lock = this.lock;
289	>	final SequenceLock lock = this.lock;
290		boolean removed = false;
291		if (c != this) {
292		lock.lock();
#	Line 327 | Line 333 | public class ReadMostlyVector<E> impleme
333		}
334
335		final boolean internalContainsAll(Collection<?> c, int origin, int bound) {
336	<	SequenceLock lock = this.lock;
336	>	final SequenceLock lock = this.lock;
337		boolean contained;
338		boolean locked = false;
339		try {
#	Line 367 | Line 373 | public class ReadMostlyVector<E> impleme
373		}
374
375		final boolean internalEquals(List<?> list, int origin, int bound) {
376	<	SequenceLock lock = this.lock;
376	>	final SequenceLock lock = this.lock;
377		boolean locked = false;
378		boolean equal;
379		try {
#	Line 408 | Line 414 | public class ReadMostlyVector<E> impleme
414		}
415
416		final int internalHashCode(int origin, int bound) {
417	<	SequenceLock lock = this.lock;
417	>	final SequenceLock lock = this.lock;
418		int hash;
419		boolean locked = false;
420		try {
#	Line 440 | Line 446 | public class ReadMostlyVector<E> impleme
446		}
447
448		final String internalToString(int origin, int bound) {
449	<	SequenceLock lock = this.lock;
449	>	final SequenceLock lock = this.lock;
450		String ret;
451		boolean locked = false;
452		try {
#	Line 487 | Line 493 | public class ReadMostlyVector<E> impleme
493
494		final Object[] internalToArray(int origin, int bound) {
495		Object[] result;
496	<	SequenceLock lock = this.lock;
496	>	final SequenceLock lock = this.lock;
497		boolean locked = false;
498		try {
499		for (;;) {
#	Line 514 | Line 520 | public class ReadMostlyVector<E> impleme
520		return result;
521		}
522
523	+	@SuppressWarnings("unchecked")
524		final <T> T[] internalToArray(T[] a, int origin, int bound) {
525		int alen = a.length;
526		T[] result;
527	<	SequenceLock lock = this.lock;
527	>	final SequenceLock lock = this.lock;
528		boolean locked = false;
529		try {
530		for (;;) {
#	Line 556 | Line 563 | public class ReadMostlyVector<E> impleme
563		// public List methods
564
565		public boolean add(E e) {
566	<	SequenceLock lock = this.lock;
566	>	final SequenceLock lock = this.lock;
567		lock.lock();
568		try {
569		rawAdd(e);
#	Line 567 | Line 574 | public class ReadMostlyVector<E> impleme
574		}
575
576		public void add(int index, E element) {
577	<	SequenceLock lock = this.lock;
577	>	final SequenceLock lock = this.lock;
578		lock.lock();
579		try {
580		rawAddAt(index, element);
#	Line 581 | Line 588 | public class ReadMostlyVector<E> impleme
588		int len = elements.length;
589		if (len == 0)
590		return false;
591	<	SequenceLock lock = this.lock;
591	>	final SequenceLock lock = this.lock;
592		lock.lock();
593		try {
594		Object[] items = array;
#	Line 598 | Line 605 | public class ReadMostlyVector<E> impleme
605		}
606
607		public boolean addAll(int index, Collection<? extends E> c) {
608	<	SequenceLock lock = this.lock;
608	>	final SequenceLock lock = this.lock;
609		boolean ret;
610		Object[] elements = c.toArray();
611		lock.lock();
#	Line 611 | Line 618 | public class ReadMostlyVector<E> impleme
618		}
619
620		public void clear() {
621	<	SequenceLock lock = this.lock;
621	>	final SequenceLock lock = this.lock;
622		lock.lock();
623		try {
624		int n = count;
#	Line 641 | Line 648 | public class ReadMostlyVector<E> impleme
648		}
649
650		public E get(int index) {
651	<	SequenceLock lock = this.lock;
651	>	final SequenceLock lock = this.lock;
652		for (;;) {
653		long seq = lock.awaitAvailability();
654		int n = count;
655		Object[] items = array;
656	<	if (n > items.length)
657	<	continue;
651	<	Object e; boolean ex;
652	<	if (index < 0 || index >= n) {
653	<	e = null;
654	<	ex = true;
655	<	}
656	<	else {
657	<	e = items[index];
658	<	ex = false;
659	<	}
656	>	@SuppressWarnings("unchecked")
657	>	E e = (index < items.length) ? (E) items[index] : null;
658		if (lock.getSequence() == seq) {
659	<	if (ex)
659	>	if (index >= n)
660		throw new ArrayIndexOutOfBoundsException(index);
661	<	else
664	<	return (E)e;
661	>	return e;
662		}
663		}
664		}
#	Line 671 | Line 668 | public class ReadMostlyVector<E> impleme
668		}
669
670		public int indexOf(Object o) {
671	<	SequenceLock lock = this.lock;
675	<	for (;;) {
676	<	long seq = lock.awaitAvailability();
677	<	Object[] items = array;
678	<	int n = count;
679	<	if (n <= items.length) {
680	<	for (int i = 0; i < n; ++i) {
681	<	Object e = items[i];
682	<	if (lock.getSequence() != seq) {
683	<	lock.lock();
684	<	try {
685	<	return rawIndexOf(o, 0, count);
686	<	} finally {
687	<	lock.unlock();
688	<	}
689	<	}
690	<	else if ((o == null) ? e == null : o.equals(e))
691	<	return i;
692	<	}
693	<	return -1;
694	<	}
695	<	}
671	>	return indexOf(o, 0);
672		}
673
674		public boolean isEmpty() {
#	Line 704 | Line 680 | public class ReadMostlyVector<E> impleme
680		}
681
682		public int lastIndexOf(Object o) {
683	<	SequenceLock lock = this.lock;
683	>	final SequenceLock lock = this.lock;
684		for (;;) {
685		long seq = lock.awaitAvailability();
686		Object[] items = array;
#	Line 715 | Line 691 | public class ReadMostlyVector<E> impleme
691		if (lock.getSequence() != seq) {
692		lock.lock();
693		try {
694	<	return rawLastIndexOf(o, 0, count);
694	>	return rawLastIndexOf(o, count - 1, 0);
695		} finally {
696		lock.unlock();
697		}
#	Line 737 | Line 713 | public class ReadMostlyVector<E> impleme
713		}
714
715		public E remove(int index) {
716	<	SequenceLock lock = this.lock;
741	<	Object oldValue;
716	>	final SequenceLock lock = this.lock;
717		lock.lock();
718		try {
719		if (index < 0 || index >= count)
720		throw new ArrayIndexOutOfBoundsException(index);
721	<	oldValue = array[index];
721	>	@SuppressWarnings("unchecked")
722	>	E oldValue = (E) array[index];
723		rawRemoveAt(index);
724	+	return oldValue;
725		} finally {
726		lock.unlock();
727		}
751	–	return (E)oldValue;
728		}
729
730		public boolean remove(Object o) {
731	<	SequenceLock lock = this.lock;
756	<	boolean removed;
731	>	final SequenceLock lock = this.lock;
732		lock.lock();
733		try {
734	<	removed = rawRemoveAt(rawIndexOf(o, 0, count));
734	>	return rawRemoveAt(rawIndexOf(o, 0, count));
735		} finally {
736		lock.unlock();
737		}
763	–	return removed;
738		}
739
740		public boolean removeAll(Collection<?> c) {
#	Line 772 | Line 746 | public class ReadMostlyVector<E> impleme
746		}
747
748		public E set(int index, E element) {
749	<	Object oldValue;
776	<	SequenceLock lock = this.lock;
749	>	final SequenceLock lock = this.lock;
750		lock.lock();
751		try {
752		Object[] items = array;
753		if (index < 0 || index >= count)
754		throw new ArrayIndexOutOfBoundsException(index);
755	<	oldValue = items[index];
755	>	@SuppressWarnings("unchecked")
756	>	E oldValue = (E) items[index];
757		items[index] = element;
758	+	return oldValue;
759		} finally {
760		lock.unlock();
761		}
787	–	return (E)oldValue;
762		}
763
764		public int size() {
#	Line 820 | Line 794 | public class ReadMostlyVector<E> impleme
794		* @return {@code true} if the element was added
795		*/
796		public boolean addIfAbsent(E e) {
797	<	boolean added;
824	<	SequenceLock lock = this.lock;
797	>	final SequenceLock lock = this.lock;
798		lock.lock();
799		try {
800		if (rawIndexOf(e, 0, count) < 0) {
801		rawAdd(e);
802	<	added = true;
802	>	return true;
803		}
804		else
805	<	added = false;
805	>	return false;
806		} finally {
807		lock.unlock();
808		}
836	–	return added;
809		}
810
811		/**
#	Line 855 | Line 827 | public class ReadMostlyVector<E> impleme
827		lock.lock();
828		try {
829		for (int i = 0; i < clen; ++i) {
830	<	Object e = cs[i];
830	>	@SuppressWarnings("unchecked")
831	>	E e = (E) cs[i];
832		if (rawIndexOf(e, 0, count) < 0) {
833		rawAdd(e);
834		++added;
#	Line 881 | Line 854 | public class ReadMostlyVector<E> impleme
854		}
855
856		static final class SnapshotIterator<E> implements Iterator<E> {
857	<	final Object[] items;
858	<	int cursor;
857	>	private final Object[] items;
858	>	private int cursor;
859		SnapshotIterator(ReadMostlyVector<E> v) { items = v.toArray(); }
860		public boolean hasNext() { return cursor < items.length; }
861	+	@SuppressWarnings("unchecked")
862		public E next() {
863		if (cursor < items.length)
864		return (E) items[cursor++];
#	Line 897 | Line 871 | public class ReadMostlyVector<E> impleme
871
872		/** See {@link Vector#firstElement} */
873		public E firstElement() {
874	<	SequenceLock lock = this.lock;
874	>	final SequenceLock lock = this.lock;
875		for (;;) {
876		long seq = lock.awaitAvailability();
877		Object[] items = array;
904	–	int len = items.length;
878		int n = count;
879	<	if (n > len)
880	<	continue;
908	<	Object e; boolean ex;
909	<	if (n > 0) {
910	<	e = items[0];
911	<	ex = false;
912	<	}
913	<	else {
914	<	e = null;
915	<	ex = true;
916	<	}
879	>	@SuppressWarnings("unchecked")
880	>	E e = (items.length > 0) ? (E) items[0] : null;
881		if (lock.getSequence() == seq) {
882	<	if (ex)
882	>	if (n <= 0)
883		throw new NoSuchElementException();
884	<	else
921	<	return (E)e;
884	>	return e;
885		}
886		}
887		}
888
889		/** See {@link Vector#lastElement} */
890		public E lastElement() {
891	<	SequenceLock lock = this.lock;
891	>	final SequenceLock lock = this.lock;
892		for (;;) {
893		long seq = lock.awaitAvailability();
894		Object[] items = array;
932	–	int len = items.length;
895		int n = count;
896	<	if (n > len)
897	<	continue;
936	<	Object e; boolean ex;
937	<	if (n > 0) {
938	<	e = items[n - 1];
939	<	ex = false;
940	<	}
941	<	else {
942	<	e = null;
943	<	ex = true;
944	<	}
896	>	@SuppressWarnings("unchecked")
897	>	E e = (n > 0 && items.length >= n) ? (E) items[n - 1] : null;
898		if (lock.getSequence() == seq) {
899	<	if (ex)
899	>	if (n <= 0)
900		throw new NoSuchElementException();
901	<	else
949	<	return (E)e;
901	>	return e;
902		}
903		}
904		}
905
906		/** See {@link Vector#indexOf(Object, int)} */
907		public int indexOf(Object o, int index) {
908	<	SequenceLock lock = this.lock;
908	>	final SequenceLock lock = this.lock;
909		int idx = 0;
910		boolean ex = false;
911		long seq = lock.awaitAvailability();
#	Line 972 | Line 924 | public class ReadMostlyVector<E> impleme
924		if (index < 0)
925		ex = true;
926		else
927	<	idx = rawIndexOf(o, 0, count);
927	>	idx = rawIndexOf(o, index, count);
928		} finally {
929		lock.unlock();
930		}
#	Line 984 | Line 936 | public class ReadMostlyVector<E> impleme
936
937		/** See {@link Vector#lastIndexOf(Object, int)} */
938		public int lastIndexOf(Object o, int index) {
939	<	SequenceLock lock = this.lock;
939	>	final SequenceLock lock = this.lock;
940		int idx = 0;
941		boolean ex = false;
942		long seq = lock.awaitAvailability();
#	Line 1017 | Line 969 | public class ReadMostlyVector<E> impleme
969		public void setSize(int newSize) {
970		if (newSize < 0)
971		throw new ArrayIndexOutOfBoundsException(newSize);
972	<	SequenceLock lock = this.lock;
972	>	final SequenceLock lock = this.lock;
973		lock.lock();
974		try {
975		int n = count;
#	Line 1036 | Line 988 | public class ReadMostlyVector<E> impleme
988
989		/** See {@link Vector#copyInto} */
990		public void copyInto(Object[] anArray) {
991	<	SequenceLock lock = this.lock;
991	>	final SequenceLock lock = this.lock;
992		lock.lock();
993		try {
994		System.arraycopy(array, 0, anArray, 0, count);
#	Line 1047 | Line 999 | public class ReadMostlyVector<E> impleme
999
1000		/** See {@link Vector#trimToSize} */
1001		public void trimToSize() {
1002	<	SequenceLock lock = this.lock;
1002	>	final SequenceLock lock = this.lock;
1003		lock.lock();
1004		try {
1005		Object[] items = array;
#	Line 1062 | Line 1014 | public class ReadMostlyVector<E> impleme
1014		/** See {@link Vector#ensureCapacity} */
1015		public void ensureCapacity(int minCapacity) {
1016		if (minCapacity > 0) {
1017	<	SequenceLock lock = this.lock;
1017	>	final SequenceLock lock = this.lock;
1018		lock.lock();
1019		try {
1020		if (minCapacity - array.length > 0)
#	Line 1121 | Line 1073 | public class ReadMostlyVector<E> impleme
1073		// other methods
1074
1075		public ReadMostlyVector<E> clone() {
1076	<	SequenceLock lock = this.lock;
1076	>	final SequenceLock lock = this.lock;
1077		Object[] a = null;
1078		boolean retry = false;
1079		long seq = lock.awaitAvailability();
#	Line 1145 | Line 1097 | public class ReadMostlyVector<E> impleme
1097
1098		private void writeObject(java.io.ObjectOutputStream s)
1099		throws java.io.IOException {
1100	<	SequenceLock lock = this.lock;
1100	>	final SequenceLock lock = this.lock;
1101		lock.lock();
1102		try {
1103		s.defaultWriteObject();
#	Line 1154 | Line 1106 | public class ReadMostlyVector<E> impleme
1106		}
1107		}
1108
1109	<	static final class Itr<E> implements ListIterator<E>, Enumeration<E>  {
1109	>	static final class Itr<E> implements ListIterator<E>, Enumeration<E> {
1110		final ReadMostlyVector<E> list;
1111		final SequenceLock lock;
1112		Object[] items;
1113	<	Object next, prev;
1113	>	E next, prev;
1114		long seq;
1115		int cursor;
1116		int fence;
#	Line 1184 | Line 1136 | public class ReadMostlyVector<E> impleme
1136		lock.getSequence() != seq);
1137		}
1138
1139	+	@SuppressWarnings("unchecked")
1140		public boolean hasNext() {
1141		boolean valid;
1142		int i = cursor;
#	Line 1192 | Line 1145 | public class ReadMostlyVector<E> impleme
1145		valid = false;
1146		break;
1147		}
1148	<	next = items[i];
1148	>	next = (E) items[i];
1149		if (lock.getSequence() == seq) {
1150		valid = true;
1151		break;
#	Line 1202 | Line 1155 | public class ReadMostlyVector<E> impleme
1155		return validNext = valid;
1156		}
1157
1158	+	@SuppressWarnings("unchecked")
1159		public boolean hasPrevious() {
1160		boolean valid;
1161		int i = cursor - 1;
#	Line 1210 | Line 1164 | public class ReadMostlyVector<E> impleme
1164		valid = false;
1165		break;
1166		}
1167	<	prev = items[i];
1167	>	prev = (E) items[i];
1168		if (lock.getSequence() == seq) {
1169		valid = true;
1170		break;
#	Line 1224 | Line 1178 | public class ReadMostlyVector<E> impleme
1178		if (validNext || hasNext()) {
1179		validNext = false;
1180		lastRet = cursor++;
1181	<	return (E) next;
1181	>	return next;
1182		}
1183		throw new NoSuchElementException();
1184		}
#	Line 1233 | Line 1187 | public class ReadMostlyVector<E> impleme
1187		if (validPrev || hasPrevious()) {
1188		validPrev = false;
1189		lastRet = cursor--;
1190	<	return (E) prev;
1190	>	return prev;
1191		}
1192		throw new NoSuchElementException();
1193		}
#	Line 1290 | Line 1244 | public class ReadMostlyVector<E> impleme
1244		public int previousIndex() { return cursor - 1; }
1245		}
1246
1247	<	static final class ReadMostlyVectorSublist<E> implements List<E>, RandomAccess, java.io.Serializable {
1247	>	static final class ReadMostlyVectorSublist<E>
1248	>	implements List<E>, RandomAccess, java.io.Serializable {
1249	>	static final long serialVersionUID = 3041673470172026059L;
1250	>
1251		final ReadMostlyVector<E> list;
1252		final int offset;
1253		volatile int size;
1254
1255	<	ReadMostlyVectorSublist(ReadMostlyVector<E> list, int offset, int size) {
1255	>	ReadMostlyVectorSublist(ReadMostlyVector<E> list,
1256	>	int offset, int size) {
1257		this.list = list;
1258		this.offset = offset;
1259		this.size = size;
#	Line 1307 | Line 1265 | public class ReadMostlyVector<E> impleme
1265		}
1266
1267		public boolean add(E element) {
1268	<	SequenceLock lock = list.lock;
1268	>	final SequenceLock lock = list.lock;
1269		lock.lock();
1270		try {
1271		int c = size;
#	Line 1320 | Line 1278 | public class ReadMostlyVector<E> impleme
1278		}
1279
1280		public void add(int index, E element) {
1281	<	SequenceLock lock = list.lock;
1281	>	final SequenceLock lock = list.lock;
1282		lock.lock();
1283		try {
1284		if (index < 0 || index > size)
#	Line 1334 | Line 1292 | public class ReadMostlyVector<E> impleme
1292
1293		public boolean addAll(Collection<? extends E> c) {
1294		Object[] elements = c.toArray();
1295	<	int added;
1338	<	SequenceLock lock = list.lock;
1295	>	final SequenceLock lock = list.lock;
1296		lock.lock();
1297		try {
1298		int s = size;
1299		int pc = list.count;
1300		list.rawAddAllAt(offset + s, elements);
1301	<	added = list.count - pc;
1301	>	int added = list.count - pc;
1302		size = s + added;
1303	+	return added != 0;
1304		} finally {
1305		lock.unlock();
1306		}
1349	–	return added != 0;
1307		}
1308
1309		public boolean addAll(int index, Collection<? extends E> c) {
1310		Object[] elements = c.toArray();
1311	<	int added;
1355	<	SequenceLock lock = list.lock;
1311	>	final SequenceLock lock = list.lock;
1312		lock.lock();
1313		try {
1314		int s = size;
#	Line 1360 | Line 1316 | public class ReadMostlyVector<E> impleme
1316		throw new ArrayIndexOutOfBoundsException(index);
1317		int pc = list.count;
1318		list.rawAddAllAt(index + offset, elements);
1319	<	added = list.count - pc;
1319	>	int added = list.count - pc;
1320		size = s + added;
1321	+	return added != 0;
1322		} finally {
1323		lock.unlock();
1324		}
1368	–	return added != 0;
1325		}
1326
1327		public void clear() {
1328	<	SequenceLock lock = list.lock;
1328	>	final SequenceLock lock = list.lock;
1329		lock.lock();
1330		try {
1331		list.internalClear(offset, offset + size);
#	Line 1406 | Line 1362 | public class ReadMostlyVector<E> impleme
1362		}
1363
1364		public int indexOf(Object o) {
1365	<	SequenceLock lock = list.lock;
1365	>	final SequenceLock lock = list.lock;
1366		long seq = lock.awaitAvailability();
1367		Object[] items = list.array;
1368		int c = list.count;
#	Line 1434 | Line 1390 | public class ReadMostlyVector<E> impleme
1390		}
1391
1392		public int lastIndexOf(Object o) {
1393	<	SequenceLock lock = list.lock;
1393	>	final SequenceLock lock = list.lock;
1394		long seq = lock.awaitAvailability();
1395		Object[] items = list.array;
1396		int c = list.count;
#	Line 1462 | Line 1418 | public class ReadMostlyVector<E> impleme
1418		}
1419
1420		public E remove(int index) {
1421	<	Object result;
1466	<	SequenceLock lock = list.lock;
1421	>	final SequenceLock lock = list.lock;
1422		lock.lock();
1423		try {
1424		Object[] items = list.array;
1425		int i = index + offset;
1426		if (index < 0 || index >= size || i >= items.length)
1427		throw new ArrayIndexOutOfBoundsException(index);
1428	<	result = items[i];
1428	>	@SuppressWarnings("unchecked")
1429	>	E result = (E) items[i];
1430		list.rawRemoveAt(i);
1431		size--;
1432	+	return result;
1433		} finally {
1434		lock.unlock();
1435		}
1479	–	return (E)result;
1436		}
1437
1438		public boolean remove(Object o) {
1439	<	boolean removed = false;
1484	<	SequenceLock lock = list.lock;
1439	>	final SequenceLock lock = list.lock;
1440		lock.lock();
1441		try {
1442		if (list.rawRemoveAt(list.rawIndexOf(o, offset,
1443		offset + size))) {
1489	–	removed = true;
1444		--size;
1445	+	return true;
1446		}
1447	+	else
1448	+	return false;
1449		} finally {
1450		lock.unlock();
1451		}
1495	–	return removed;
1452		}
1453
1454		public boolean removeAll(Collection<?> c) {
#	Line 1540 | Line 1496 | public class ReadMostlyVector<E> impleme
1496		final ReadMostlyVector<E> list;
1497		final SequenceLock lock;
1498		Object[] items;
1499	<	Object next, prev;
1499	>	E next, prev;
1500		long seq;
1501		int cursor;
1502		int fence;
#	Line 1571 | Line 1527 | public class ReadMostlyVector<E> impleme
1527		} while (lock.getSequence() != seq);
1528		}
1529
1530	+	@SuppressWarnings("unchecked")
1531		public boolean hasNext() {
1532		boolean valid;
1533		int i = cursor;
#	Line 1579 | Line 1536 | public class ReadMostlyVector<E> impleme
1536		valid = false;
1537		break;
1538		}
1539	<	next = items[i];
1539	>	next = (E) items[i];
1540		if (lock.getSequence() == seq) {
1541		valid = true;
1542		break;
#	Line 1589 | Line 1546 | public class ReadMostlyVector<E> impleme
1546		return validNext = valid;
1547		}
1548
1549	+	@SuppressWarnings("unchecked")
1550		public boolean hasPrevious() {
1551		boolean valid;
1552		int i = cursor - 1;
#	Line 1597 | Line 1555 | public class ReadMostlyVector<E> impleme
1555		valid = false;
1556		break;
1557		}
1558	<	prev = items[i];
1558	>	prev = (E) items[i];
1559		if (lock.getSequence() == seq) {
1560		valid = true;
1561		break;
#	Line 1611 | Line 1569 | public class ReadMostlyVector<E> impleme
1569		if (validNext || hasNext()) {
1570		validNext = false;
1571		lastRet = cursor++;
1572	<	return (E) next;
1572	>	return next;
1573		}
1574		throw new NoSuchElementException();
1575		}
#	Line 1620 | Line 1578 | public class ReadMostlyVector<E> impleme
1578		if (validPrev || hasPrevious()) {
1579		validPrev = false;
1580		lastRet = cursor--;
1581	<	return (E) prev;
1581	>	return prev;
1582		}
1583		throw new NoSuchElementException();
1584		}

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