19 |
|
* best-effort in the presence of concurrent modifications, and do |
20 |
|
* <em>NOT</em> throw {@link ConcurrentModificationException}. An |
21 |
|
* iterator's {@code next()} method returns consecutive elements as |
22 |
< |
* they appear in the underlying array upon each access. |
22 |
> |
* they appear in the underlying array upon each access. Alternatively, |
23 |
> |
* method {@link #snapshotIterator} may be used for deterministic |
24 |
> |
* traversals, at the expense of making a copy, and unavailability of |
25 |
> |
* method {@code Iterator.remove}. |
26 |
|
* |
27 |
|
* <p>Otherwise, this class supports all methods, under the same |
28 |
|
* documented specifications, as {@code Vector}. Consult {@link |
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 |
|
/* |
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 |
|
/** |
63 |
|
private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
64 |
|
|
65 |
|
// fields are non-private to simpify nested class access |
66 |
< |
Object[] array; |
66 |
> |
volatile Object[] array; |
67 |
|
final SequenceLock lock; |
68 |
< |
int count; |
68 |
> |
volatile int count; |
69 |
|
final int capacityIncrement; |
70 |
|
|
71 |
|
/** |
135 |
|
} |
136 |
|
|
137 |
|
// For explanation, see CopyOnWriteArrayList |
138 |
< |
final void grow(int minCapacity) { |
138 |
> |
final Object[] grow(int minCapacity) { |
139 |
|
int oldCapacity = array.length; |
140 |
|
int newCapacity = oldCapacity + ((capacityIncrement > 0) ? |
141 |
|
capacityIncrement : oldCapacity); |
143 |
|
newCapacity = minCapacity; |
144 |
|
if (newCapacity - MAX_ARRAY_SIZE > 0) |
145 |
|
newCapacity = hugeCapacity(minCapacity); |
146 |
< |
array = Arrays.copyOf(array, newCapacity); |
146 |
> |
return array = Arrays.copyOf(array, newCapacity); |
147 |
|
} |
148 |
|
|
149 |
|
static int hugeCapacity(int minCapacity) { |
167 |
|
Object e = items[i]; |
168 |
|
if (lock.getSequence() != seq) |
169 |
|
break; |
170 |
< |
if (x == null? e == null : x.equals(e)) |
170 |
> |
if ((x == null) ? e == null : x.equals(e)) |
171 |
|
return i; |
172 |
|
} |
173 |
|
return -1; |
177 |
|
Object[] items = array; |
178 |
|
for (int i = index; i < fence; ++i) { |
179 |
|
Object e = items[i]; |
180 |
< |
if (x == null? e == null : x.equals(e)) |
180 |
> |
if ((x == null) ? e == null : x.equals(e)) |
181 |
|
return i; |
182 |
|
} |
183 |
|
return -1; |
189 |
|
Object e = items[i]; |
190 |
|
if (lock.getSequence() != seq) |
191 |
|
break; |
192 |
< |
if (x == null? e == null : x.equals(e)) |
192 |
> |
if ((x == null) ? e == null : x.equals(e)) |
193 |
|
return i; |
194 |
|
} |
195 |
|
return -1; |
199 |
|
Object[] items = array; |
200 |
|
for (int i = index; i >= origin; --i) { |
201 |
|
Object e = items[i]; |
202 |
< |
if (x == null? e == null : x.equals(e)) |
202 |
> |
if ((x == null) ? e == null : x.equals(e)) |
203 |
|
return i; |
204 |
|
} |
205 |
|
return -1; |
206 |
|
} |
207 |
|
|
208 |
< |
final void rawAdd(Object e) { |
208 |
> |
final void rawAdd(E e) { |
209 |
|
int n = count; |
210 |
< |
if (n >= array.length) |
211 |
< |
grow(n + 1); |
212 |
< |
array[n] = e; |
210 |
> |
Object[] items = array; |
211 |
> |
if (n >= items.length) |
212 |
> |
items = grow(n + 1); |
213 |
> |
items[n] = e; |
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) |
221 |
|
throw new ArrayIndexOutOfBoundsException(index); |
222 |
< |
if (n >= array.length) |
223 |
< |
grow(n + 1); |
222 |
> |
if (n >= items.length) |
223 |
> |
items = grow(n + 1); |
224 |
|
if (index < n) |
225 |
< |
System.arraycopy(array, index, array, index + 1, n - index); |
226 |
< |
array[index] = e; |
225 |
> |
System.arraycopy(items, index, items, index + 1, n - index); |
226 |
> |
items[index] = e; |
227 |
|
count = n + 1; |
228 |
|
} |
229 |
|
|
230 |
|
final boolean rawAddAllAt(int index, Object[] elements) { |
231 |
|
int n = count; |
232 |
+ |
Object[] items = array; |
233 |
|
if (index < 0 || index > n) |
234 |
|
throw new ArrayIndexOutOfBoundsException(index); |
235 |
|
int len = elements.length; |
236 |
|
if (len == 0) |
237 |
|
return false; |
238 |
|
int newCount = n + len; |
239 |
< |
if (newCount >= array.length) |
240 |
< |
grow(newCount); |
241 |
< |
int mv = count - index; |
239 |
> |
if (newCount >= items.length) |
240 |
> |
items = grow(newCount); |
241 |
> |
int mv = n - index; |
242 |
|
if (mv > 0) |
243 |
< |
System.arraycopy(array, index, array, index + len, mv); |
244 |
< |
System.arraycopy(elements, 0, array, index, len); |
243 |
> |
System.arraycopy(items, index, items, index + len, mv); |
244 |
> |
System.arraycopy(elements, 0, items, index, len); |
245 |
|
count = newCount; |
246 |
|
return true; |
247 |
|
} |
248 |
|
|
249 |
|
final boolean rawRemoveAt(int index) { |
250 |
|
int n = count - 1; |
251 |
+ |
Object[] items = array; |
252 |
|
if (index < 0 || index > n) |
253 |
|
return false; |
254 |
|
int mv = n - index; |
255 |
|
if (mv > 0) |
256 |
< |
System.arraycopy(array, index + 1, array, index, mv); |
257 |
< |
array[n] = null; |
256 |
> |
System.arraycopy(items, index + 1, items, index, mv); |
257 |
> |
items[n] = null; |
258 |
|
count = n; |
259 |
|
return true; |
260 |
|
} |
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 { |
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(); |
293 |
|
try { |
294 |
+ |
Object[] items = array; |
295 |
|
int i = origin; |
296 |
|
int n = count; |
297 |
|
int fence = bound < 0 || bound > n ? n : bound; |
298 |
|
while (i >= 0 && i < fence) { |
299 |
< |
if (c.contains(array[i])) |
299 |
> |
if (c.contains(items[i])) |
300 |
|
++i; |
301 |
|
else { |
302 |
|
--fence; |
303 |
< |
int mv = --count - i; |
303 |
> |
int mv = --n - i; |
304 |
|
if (mv > 0) |
305 |
< |
System.arraycopy(array, i + 1, array, i, mv); |
292 |
< |
removed = true; |
305 |
> |
System.arraycopy(items, i + 1, items, i, mv); |
306 |
|
} |
307 |
|
} |
308 |
+ |
if (count != n) { |
309 |
+ |
count = n; |
310 |
+ |
removed = true; |
311 |
+ |
} |
312 |
|
} finally { |
313 |
|
lock.unlock(); |
314 |
|
} |
320 |
|
int n = count; |
321 |
|
int fence = bound < 0 || bound > n ? n : bound; |
322 |
|
if (origin >= 0 && origin < fence) { |
323 |
+ |
Object[] items = array; |
324 |
|
int removed = fence - origin; |
325 |
|
int newCount = n - removed; |
326 |
|
int mv = n - (origin + removed); |
327 |
|
if (mv > 0) |
328 |
< |
System.arraycopy(array, origin + removed, array, origin, mv); |
328 |
> |
System.arraycopy(items, origin + removed, items, origin, mv); |
329 |
|
for (int i = n; i < newCount; ++i) |
330 |
< |
array[i] = null; |
330 |
> |
items[i] = null; |
331 |
|
count = newCount; |
332 |
|
} |
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 { |
340 |
|
for (;;) { |
341 |
|
long seq = lock.awaitAvailability(); |
342 |
+ |
int n = count; |
343 |
|
Object[] items = array; |
344 |
|
int len = items.length; |
326 |
– |
int n = count; |
345 |
|
if (n > len) |
346 |
|
continue; |
347 |
|
int fence = bound < 0 || bound > n ? n : bound; |
350 |
|
else { |
351 |
|
contained = true; |
352 |
|
for (Object e : c) { |
353 |
< |
int idx = (locked? |
353 |
> |
int idx = (locked ? |
354 |
|
rawIndexOf(e, origin, fence) : |
355 |
|
validatedIndexOf(e, items, origin, |
356 |
|
fence, seq)); |
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 { |
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 { |
422 |
|
hash = 1; |
423 |
|
long seq = lock.awaitAvailability(); |
424 |
|
Object[] items = array; |
407 |
– |
int len = items.length; |
425 |
|
int n = count; |
426 |
+ |
int len = items.length; |
427 |
|
if (n > len) |
428 |
|
continue; |
429 |
|
int fence = bound < 0 || bound > n ? n : bound; |
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 { |
453 |
|
outer:for (;;) { |
454 |
|
long seq = lock.awaitAvailability(); |
455 |
|
Object[] items = array; |
438 |
– |
int len = items.length; |
456 |
|
int n = count; |
457 |
+ |
int len = items.length; |
458 |
|
if (n > len) |
459 |
|
continue; |
460 |
|
int fence = bound < 0 || bound > n ? n : bound; |
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 (;;) { |
500 |
|
result = null; |
501 |
|
long seq = lock.awaitAvailability(); |
502 |
|
Object[] items = array; |
485 |
– |
int len = items.length; |
503 |
|
int n = count; |
504 |
+ |
int len = items.length; |
505 |
|
if (n > len) |
506 |
|
continue; |
507 |
|
int fence = bound < 0 || bound > n ? n : bound; |
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 (;;) { |
531 |
|
long seq = lock.awaitAvailability(); |
532 |
|
Object[] items = array; |
514 |
– |
int len = items.length; |
533 |
|
int n = count; |
534 |
+ |
int len = items.length; |
535 |
|
if (n > len) |
536 |
|
continue; |
537 |
|
int fence = bound < 0 || bound > n ? n : bound; |
540 |
|
rlen = 0; |
541 |
|
if (origin < 0 || alen >= rlen) { |
542 |
|
if (rlen > 0) |
543 |
< |
System.arraycopy(array, 0, a, origin, rlen); |
543 |
> |
System.arraycopy(items, 0, a, origin, rlen); |
544 |
|
if (alen > rlen) |
545 |
|
a[rlen] = null; |
546 |
|
result = a; |
547 |
|
} |
548 |
|
else |
549 |
< |
result = (T[]) Arrays.copyOfRange(array, origin, |
549 |
> |
result = (T[]) Arrays.copyOfRange(items, origin, |
550 |
|
fence, a.getClass()); |
551 |
|
if (lock.getSequence() == seq) |
552 |
|
break; |
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); |
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); |
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 |
< |
int newCount = count + len; |
595 |
< |
if (newCount >= array.length) |
596 |
< |
grow(newCount); |
597 |
< |
System.arraycopy(elements, 0, array, count, len); |
594 |
> |
Object[] items = array; |
595 |
> |
int n = count; |
596 |
> |
int newCount = n + len; |
597 |
> |
if (newCount >= items.length) |
598 |
> |
items = grow(newCount); |
599 |
> |
System.arraycopy(elements, 0, items, n, len); |
600 |
|
count = newCount; |
601 |
|
} finally { |
602 |
|
lock.unlock(); |
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(); |
618 |
|
} |
619 |
|
|
620 |
|
public void clear() { |
621 |
< |
SequenceLock lock = this.lock; |
621 |
> |
final SequenceLock lock = this.lock; |
622 |
|
lock.lock(); |
623 |
|
try { |
624 |
< |
for (int i = 0; i < count; i++) |
625 |
< |
array[i] = null; |
624 |
> |
int n = count; |
625 |
> |
Object[] items = array; |
626 |
> |
for (int i = 0; i < n; i++) |
627 |
> |
items[i] = null; |
628 |
|
count = 0; |
629 |
|
} finally { |
630 |
|
lock.unlock(); |
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(); |
631 |
– |
Object[] items = array; |
654 |
|
int n = count; |
655 |
< |
if (n > items.length) |
656 |
< |
continue; |
657 |
< |
Object e; boolean ex; |
636 |
< |
if (index < 0 || index >= n) { |
637 |
< |
e = null; |
638 |
< |
ex = true; |
639 |
< |
} |
640 |
< |
else { |
641 |
< |
e = items[index]; |
642 |
< |
ex = false; |
643 |
< |
} |
655 |
> |
Object[] items = array; |
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 |
648 |
< |
return (E)e; |
661 |
> |
return e; |
662 |
|
} |
663 |
|
} |
664 |
|
} |
668 |
|
} |
669 |
|
|
670 |
|
public int indexOf(Object o) { |
671 |
< |
SequenceLock lock = this.lock; |
659 |
< |
long seq = lock.awaitAvailability(); |
660 |
< |
Object[] items = array; |
661 |
< |
int n = count; |
662 |
< |
if (n <= items.length) { |
663 |
< |
boolean valid = true; |
664 |
< |
for (int i = 0; i < n; ++i) { |
665 |
< |
Object e = items[i]; |
666 |
< |
if (lock.getSequence() == seq) { |
667 |
< |
if (o == null? e == null : o.equals(e)) |
668 |
< |
return i; |
669 |
< |
} |
670 |
< |
else { |
671 |
< |
valid = false; |
672 |
< |
break; |
673 |
< |
} |
674 |
< |
} |
675 |
< |
if (valid) |
676 |
< |
return -1; |
677 |
< |
} |
678 |
< |
lock.lock(); |
679 |
< |
try { |
680 |
< |
return rawIndexOf(o, 0, count); |
681 |
< |
} finally { |
682 |
< |
lock.unlock(); |
683 |
< |
} |
671 |
> |
return indexOf(o, 0); |
672 |
|
} |
673 |
|
|
674 |
|
public boolean isEmpty() { |
687 |
– |
long ignore = lock.getSequence(); |
675 |
|
return count == 0; |
676 |
|
} |
677 |
|
|
678 |
|
public Iterator<E> iterator() { |
679 |
< |
return new Itr(this, 0); |
679 |
> |
return new Itr<E>(this, 0); |
680 |
|
} |
681 |
|
|
682 |
|
public int lastIndexOf(Object o) { |
683 |
< |
SequenceLock lock = this.lock; |
684 |
< |
long seq = lock.awaitAvailability(); |
685 |
< |
Object[] items = array; |
686 |
< |
int n = count; |
687 |
< |
if (n <= items.length) { |
688 |
< |
int idx = validatedLastIndexOf(o, items, n - 1, 0, seq); |
689 |
< |
if (lock.getSequence() == seq) |
690 |
< |
return idx; |
691 |
< |
} |
692 |
< |
lock.lock(); |
693 |
< |
try { |
694 |
< |
return rawLastIndexOf(o, count - 1, 0); |
695 |
< |
} finally { |
696 |
< |
lock.unlock(); |
683 |
> |
final SequenceLock lock = this.lock; |
684 |
> |
for (;;) { |
685 |
> |
long seq = lock.awaitAvailability(); |
686 |
> |
Object[] items = array; |
687 |
> |
int n = count; |
688 |
> |
if (n <= items.length) { |
689 |
> |
for (int i = n - 1; i >= 0; --i) { |
690 |
> |
Object e = items[i]; |
691 |
> |
if (lock.getSequence() != seq) { |
692 |
> |
lock.lock(); |
693 |
> |
try { |
694 |
> |
return rawLastIndexOf(o, count, 0); |
695 |
> |
} finally { |
696 |
> |
lock.unlock(); |
697 |
> |
} |
698 |
> |
} |
699 |
> |
else if ((o == null) ? e == null : o.equals(e)) |
700 |
> |
return i; |
701 |
> |
} |
702 |
> |
return -1; |
703 |
> |
} |
704 |
|
} |
705 |
|
} |
706 |
|
|
707 |
|
public ListIterator<E> listIterator() { |
708 |
< |
return new Itr(this, 0); |
708 |
> |
return new Itr<E>(this, 0); |
709 |
|
} |
710 |
|
|
711 |
|
public ListIterator<E> listIterator(int index) { |
712 |
< |
return new Itr(this, index); |
712 |
> |
return new Itr<E>(this, index); |
713 |
|
} |
714 |
|
|
715 |
|
public E remove(int index) { |
716 |
< |
SequenceLock lock = this.lock; |
723 |
< |
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 |
|
} |
733 |
– |
return (E)oldValue; |
728 |
|
} |
729 |
|
|
730 |
|
public boolean remove(Object o) { |
731 |
< |
SequenceLock lock = this.lock; |
738 |
< |
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 |
|
} |
745 |
– |
return removed; |
738 |
|
} |
739 |
|
|
740 |
|
public boolean removeAll(Collection<?> c) { |
746 |
|
} |
747 |
|
|
748 |
|
public E set(int index, E element) { |
749 |
< |
Object oldValue; |
758 |
< |
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 = array[index]; |
756 |
< |
array[index] = element; |
755 |
> |
@SuppressWarnings("unchecked") |
756 |
> |
E oldValue = (E) items[index]; |
757 |
> |
items[index] = element; |
758 |
> |
return oldValue; |
759 |
|
} finally { |
760 |
|
lock.unlock(); |
761 |
|
} |
768 |
– |
return (E)oldValue; |
762 |
|
} |
763 |
|
|
764 |
|
public int size() { |
772 |
– |
long ignore = lock.getSequence(); |
765 |
|
return count; |
766 |
|
} |
767 |
|
|
770 |
|
int ssize = toIndex - fromIndex; |
771 |
|
if (fromIndex < 0 || toIndex > c || ssize < 0) |
772 |
|
throw new IndexOutOfBoundsException(); |
773 |
< |
return new ReadMostlyVectorSublist(this, fromIndex, ssize); |
773 |
> |
return new ReadMostlyVectorSublist<E>(this, fromIndex, ssize); |
774 |
|
} |
775 |
|
|
776 |
|
public Object[] toArray() { |
791 |
|
* Append the element if not present. |
792 |
|
* |
793 |
|
* @param e element to be added to this list, if absent |
794 |
< |
* @return <tt>true</tt> if the element was added |
794 |
> |
* @return {@code true} if the element was added |
795 |
|
*/ |
796 |
|
public boolean addIfAbsent(E e) { |
797 |
< |
boolean added; |
806 |
< |
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 |
|
} |
818 |
– |
return added; |
809 |
|
} |
810 |
|
|
811 |
|
/** |
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; |
841 |
|
return added; |
842 |
|
} |
843 |
|
|
844 |
+ |
/** |
845 |
+ |
* Returns an iterator operating over a snapshot copy of the |
846 |
+ |
* elements of this collection created upon construction of the |
847 |
+ |
* iterator. The iterator does <em>NOT</em> support the |
848 |
+ |
* {@code remove} method. |
849 |
+ |
* |
850 |
+ |
* @return an iterator over the elements in this list in proper sequence |
851 |
+ |
*/ |
852 |
+ |
public Iterator<E> snapshotIterator() { |
853 |
+ |
return new SnapshotIterator<E>(this); |
854 |
+ |
} |
855 |
+ |
|
856 |
+ |
static final class SnapshotIterator<E> implements Iterator<E> { |
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++]; |
865 |
+ |
throw new NoSuchElementException(); |
866 |
+ |
} |
867 |
+ |
public void remove() { throw new UnsupportedOperationException() ; } |
868 |
+ |
} |
869 |
+ |
|
870 |
|
// Vector-only methods |
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; |
861 |
– |
int len = items.length; |
878 |
|
int n = count; |
879 |
< |
if (n > len) |
880 |
< |
continue; |
865 |
< |
Object e; boolean ex; |
866 |
< |
if (n > 0) { |
867 |
< |
e = items[0]; |
868 |
< |
ex = false; |
869 |
< |
} |
870 |
< |
else { |
871 |
< |
e = null; |
872 |
< |
ex = true; |
873 |
< |
} |
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 |
878 |
< |
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; |
889 |
– |
int len = items.length; |
895 |
|
int n = count; |
896 |
< |
if (n > len) |
897 |
< |
continue; |
893 |
< |
Object e; boolean ex; |
894 |
< |
if (n > 0) { |
895 |
< |
e = items[n - 1]; |
896 |
< |
ex = false; |
897 |
< |
} |
898 |
< |
else { |
899 |
< |
e = null; |
900 |
< |
ex = true; |
901 |
< |
} |
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 |
906 |
< |
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(); |
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 |
|
} |
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(); |
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; |
976 |
|
if (newSize > n) |
977 |
|
grow(newSize); |
978 |
|
else { |
979 |
+ |
Object[] items = array; |
980 |
|
for (int i = newSize ; i < n ; i++) |
981 |
< |
array[i] = null; |
981 |
> |
items[i] = null; |
982 |
|
} |
983 |
|
count = newSize; |
984 |
|
} finally { |
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); |
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 |
< |
if (count < array.length) |
1006 |
< |
array = Arrays.copyOf(array, count); |
1005 |
> |
Object[] items = array; |
1006 |
> |
int n = count; |
1007 |
> |
if (n < items.length) |
1008 |
> |
array = Arrays.copyOf(items, n); |
1009 |
|
} finally { |
1010 |
|
lock.unlock(); |
1011 |
|
} |
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) |
1027 |
|
|
1028 |
|
/** See {@link Vector#elements} */ |
1029 |
|
public Enumeration<E> elements() { |
1030 |
< |
return new Itr(this, 0); |
1030 |
> |
return new Itr<E>(this, 0); |
1031 |
|
} |
1032 |
|
|
1033 |
|
/** See {@link Vector#capacity} */ |
1034 |
|
public int capacity() { |
1037 |
– |
long ignore = lock.getSequence(); |
1035 |
|
return array.length; |
1036 |
|
} |
1037 |
|
|
1072 |
|
|
1073 |
|
// other methods |
1074 |
|
|
1075 |
< |
public Object clone() { |
1076 |
< |
SequenceLock lock = this.lock; |
1075 |
> |
public ReadMostlyVector<E> clone() { |
1076 |
> |
final SequenceLock lock = this.lock; |
1077 |
|
Object[] a = null; |
1078 |
|
boolean retry = false; |
1079 |
|
long seq = lock.awaitAvailability(); |
1092 |
|
lock.unlock(); |
1093 |
|
} |
1094 |
|
} |
1095 |
< |
return new ReadMostlyVector(a, n, capacityIncrement); |
1095 |
> |
return new ReadMostlyVector<E>(a, n, capacityIncrement); |
1096 |
|
} |
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(); |
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; |
1136 |
|
lock.getSequence() != seq); |
1137 |
|
} |
1138 |
|
|
1139 |
+ |
@SuppressWarnings("unchecked") |
1140 |
|
public boolean hasNext() { |
1141 |
|
boolean valid; |
1142 |
|
int i = cursor; |
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; |
1155 |
|
return validNext = valid; |
1156 |
|
} |
1157 |
|
|
1158 |
+ |
@SuppressWarnings("unchecked") |
1159 |
|
public boolean hasPrevious() { |
1160 |
|
boolean valid; |
1161 |
|
int i = cursor - 1; |
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; |
1178 |
|
if (validNext || hasNext()) { |
1179 |
|
validNext = false; |
1180 |
|
lastRet = cursor++; |
1181 |
< |
return (E) next; |
1181 |
> |
return next; |
1182 |
|
} |
1183 |
|
throw new NoSuchElementException(); |
1184 |
|
} |
1187 |
|
if (validPrev || hasPrevious()) { |
1188 |
|
validPrev = false; |
1189 |
|
lastRet = cursor--; |
1190 |
< |
return (E) prev; |
1190 |
> |
return prev; |
1191 |
|
} |
1192 |
|
throw new NoSuchElementException(); |
1193 |
|
} |
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; |
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; |
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) |
1292 |
|
|
1293 |
|
public boolean addAll(Collection<? extends E> c) { |
1294 |
|
Object[] elements = c.toArray(); |
1295 |
< |
int added; |
1293 |
< |
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 |
|
} |
1304 |
– |
return added != 0; |
1307 |
|
} |
1308 |
|
|
1309 |
|
public boolean addAll(int index, Collection<? extends E> c) { |
1310 |
|
Object[] elements = c.toArray(); |
1311 |
< |
int added; |
1310 |
< |
SequenceLock lock = list.lock; |
1311 |
> |
final SequenceLock lock = list.lock; |
1312 |
|
lock.lock(); |
1313 |
|
try { |
1314 |
|
int s = size; |
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 |
|
} |
1323 |
– |
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); |
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; |
1386 |
|
} |
1387 |
|
|
1388 |
|
public Iterator<E> iterator() { |
1389 |
< |
return new SubItr(this, offset); |
1389 |
> |
return new SubItr<E>(this, offset); |
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; |
1410 |
|
} |
1411 |
|
|
1412 |
|
public ListIterator<E> listIterator() { |
1413 |
< |
return new SubItr(this, offset); |
1413 |
> |
return new SubItr<E>(this, offset); |
1414 |
|
} |
1415 |
|
|
1416 |
|
public ListIterator<E> listIterator(int index) { |
1417 |
< |
return new SubItr(this, index + offset); |
1417 |
> |
return new SubItr<E>(this, index + offset); |
1418 |
|
} |
1419 |
|
|
1420 |
|
public E remove(int index) { |
1421 |
< |
Object result; |
1421 |
< |
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 |
|
} |
1434 |
– |
return (E)result; |
1436 |
|
} |
1437 |
|
|
1438 |
|
public boolean remove(Object o) { |
1439 |
< |
boolean removed = false; |
1439 |
< |
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))) { |
1444 |
– |
removed = true; |
1444 |
|
--size; |
1445 |
+ |
return true; |
1446 |
|
} |
1447 |
+ |
else |
1448 |
+ |
return false; |
1449 |
|
} finally { |
1450 |
|
lock.unlock(); |
1451 |
|
} |
1450 |
– |
return removed; |
1452 |
|
} |
1453 |
|
|
1454 |
|
public boolean removeAll(Collection<?> c) { |
1474 |
|
int ssize = toIndex - fromIndex; |
1475 |
|
if (fromIndex < 0 || toIndex > c || ssize < 0) |
1476 |
|
throw new IndexOutOfBoundsException(); |
1477 |
< |
return new ReadMostlyVectorSublist(list, offset+fromIndex, ssize); |
1477 |
> |
return new ReadMostlyVectorSublist<E>(list, offset+fromIndex, ssize); |
1478 |
|
} |
1479 |
|
|
1480 |
|
public Object[] toArray() { |
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; |
1527 |
|
} while (lock.getSequence() != seq); |
1528 |
|
} |
1529 |
|
|
1530 |
+ |
@SuppressWarnings("unchecked") |
1531 |
|
public boolean hasNext() { |
1532 |
|
boolean valid; |
1533 |
|
int i = cursor; |
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; |
1546 |
|
return validNext = valid; |
1547 |
|
} |
1548 |
|
|
1549 |
+ |
@SuppressWarnings("unchecked") |
1550 |
|
public boolean hasPrevious() { |
1551 |
|
boolean valid; |
1552 |
|
int i = cursor - 1; |
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; |
1569 |
|
if (validNext || hasNext()) { |
1570 |
|
validNext = false; |
1571 |
|
lastRet = cursor++; |
1572 |
< |
return (E) next; |
1572 |
> |
return next; |
1573 |
|
} |
1574 |
|
throw new NoSuchElementException(); |
1575 |
|
} |
1578 |
|
if (validPrev || hasPrevious()) { |
1579 |
|
validPrev = false; |
1580 |
|
lastRet = cursor--; |
1581 |
< |
return (E) prev; |
1581 |
> |
return prev; |
1582 |
|
} |
1583 |
|
throw new NoSuchElementException(); |
1584 |
|
} |