1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* Expert Group and released to the public domain, as explained at |
4 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
package jsr166e.extra; |
8 |
import jsr166e.StampedLock; |
9 |
import java.util.*; |
10 |
|
11 |
/** |
12 |
* A class with the same methods and array-based characteristics as |
13 |
* {@link java.util.Vector} but with reduced contention and improved |
14 |
* throughput when invocations of read-only methods by multiple |
15 |
* threads are most common. |
16 |
* |
17 |
* <p>The iterators returned by this class's {@link #iterator() |
18 |
* iterator} and {@link #listIterator(int) listIterator} methods are |
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. 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 |
29 |
* java.util.Vector} for detailed specifications. Additionally, this |
30 |
* class provides methods {@link #addIfAbsent} and {@link |
31 |
* #addAllAbsent}. |
32 |
* |
33 |
* @author Doug Lea |
34 |
*/ |
35 |
public class ReadMostlyVector<E> |
36 |
implements List<E>, RandomAccess, Cloneable, java.io.Serializable { |
37 |
private static final long serialVersionUID = 8673264195747942595L; |
38 |
|
39 |
/* |
40 |
* This class exists mainly as a vehicle to exercise various |
41 |
* constructions using SequenceLocks. Read-only methods |
42 |
* take one of a few forms: |
43 |
* |
44 |
* Short methods,including get(index), continually retry obtaining |
45 |
* a snapshot of array, count, and element, using sequence number |
46 |
* to validate. |
47 |
* |
48 |
* Methods that are potentially O(n) (or worse) try once in |
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 |
/** |
60 |
* The maximum size of array to allocate. |
61 |
* See CopyOnWriteArrayList for explanation. |
62 |
*/ |
63 |
private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
64 |
|
65 |
// fields are non-private to simplify nested class access |
66 |
Object[] array; |
67 |
final StampedLock lock; |
68 |
int count; |
69 |
final int capacityIncrement; |
70 |
|
71 |
/** |
72 |
* Creates an empty vector with the given initial capacity and |
73 |
* capacity increment. |
74 |
* |
75 |
* @param initialCapacity the initial capacity of the underlying array |
76 |
* @param capacityIncrement if non-zero, the number to |
77 |
* add when resizing to accommodate additional elements. |
78 |
* If zero, the array size is doubled when resized. |
79 |
* |
80 |
* @throws IllegalArgumentException if initial capacity is negative |
81 |
*/ |
82 |
public ReadMostlyVector(int initialCapacity, int capacityIncrement) { |
83 |
super(); |
84 |
if (initialCapacity < 0) |
85 |
throw new IllegalArgumentException("Illegal Capacity: "+ |
86 |
initialCapacity); |
87 |
this.array = new Object[initialCapacity]; |
88 |
this.capacityIncrement = capacityIncrement; |
89 |
this.lock = new StampedLock(); |
90 |
} |
91 |
|
92 |
/** |
93 |
* Creates an empty vector with the given initial capacity. |
94 |
* |
95 |
* @param initialCapacity the initial capacity of the underlying array |
96 |
* @throws IllegalArgumentException if initial capacity is negative |
97 |
*/ |
98 |
public ReadMostlyVector(int initialCapacity) { |
99 |
this(initialCapacity, 0); |
100 |
} |
101 |
|
102 |
/** |
103 |
* Creates an empty vector. |
104 |
*/ |
105 |
public ReadMostlyVector() { |
106 |
this.capacityIncrement = 0; |
107 |
this.lock = new StampedLock(); |
108 |
} |
109 |
|
110 |
/** |
111 |
* Creates a vector containing the elements of the specified |
112 |
* collection, in the order they are returned by the collection's |
113 |
* iterator. |
114 |
* |
115 |
* @param c the collection of initially held elements |
116 |
* @throws NullPointerException if the specified collection is null |
117 |
*/ |
118 |
public ReadMostlyVector(Collection<? extends E> c) { |
119 |
Object[] elements = c.toArray(); |
120 |
// c.toArray might (incorrectly) not return Object[] (see 6260652) |
121 |
if (elements.getClass() != Object[].class) |
122 |
elements = Arrays.copyOf(elements, elements.length, Object[].class); |
123 |
this.array = elements; |
124 |
this.count = elements.length; |
125 |
this.capacityIncrement = 0; |
126 |
this.lock = new StampedLock(); |
127 |
} |
128 |
|
129 |
// internal constructor for clone |
130 |
ReadMostlyVector(Object[] array, int count, int capacityIncrement) { |
131 |
this.array = array; |
132 |
this.count = count; |
133 |
this.capacityIncrement = capacityIncrement; |
134 |
this.lock = new StampedLock(); |
135 |
} |
136 |
|
137 |
static final int INITIAL_CAP = 16; |
138 |
|
139 |
// For explanation, see CopyOnWriteArrayList |
140 |
final Object[] grow(int minCapacity) { |
141 |
Object[] items; |
142 |
int newCapacity; |
143 |
if ((items = array) == null) |
144 |
newCapacity = INITIAL_CAP; |
145 |
else { |
146 |
int oldCapacity = array.length; |
147 |
newCapacity = oldCapacity + ((capacityIncrement > 0) ? |
148 |
capacityIncrement : oldCapacity); |
149 |
} |
150 |
if (newCapacity - minCapacity < 0) |
151 |
newCapacity = minCapacity; |
152 |
if (newCapacity - MAX_ARRAY_SIZE > 0) { |
153 |
if (minCapacity < 0) // overflow |
154 |
throw new OutOfMemoryError(); |
155 |
else if (minCapacity > MAX_ARRAY_SIZE) |
156 |
newCapacity = Integer.MAX_VALUE; |
157 |
else |
158 |
newCapacity = MAX_ARRAY_SIZE; |
159 |
} |
160 |
return array = ((items == null) ? |
161 |
new Object[newCapacity] : |
162 |
Arrays.copyOf(items, newCapacity)); |
163 |
} |
164 |
|
165 |
/* |
166 |
* Internal versions of most base functionality, wrapped |
167 |
* in different ways from public methods from this class |
168 |
* as well as sublist and iterator classes. |
169 |
*/ |
170 |
|
171 |
static int findFirstIndex(Object[] items, Object x, int index, int fence) { |
172 |
int len; |
173 |
if (items != null && (len = items.length) > 0) { |
174 |
int start = (index < 0) ? 0 : index; |
175 |
int bound = (fence < len) ? fence : len; |
176 |
for (int i = start; i < bound; ++i) { |
177 |
Object e = items[i]; |
178 |
if ((x == null) ? e == null : x.equals(e)) |
179 |
return i; |
180 |
} |
181 |
} |
182 |
return -1; |
183 |
} |
184 |
|
185 |
static int findLastIndex(Object[] items, Object x, int index, int origin) { |
186 |
int len; |
187 |
if (items != null && (len = items.length) > 0) { |
188 |
int last = (index < len) ? index : len - 1; |
189 |
int start = (origin < 0) ? 0 : origin; |
190 |
for (int i = last; i >= start; --i) { |
191 |
Object e = items[i]; |
192 |
if ((x == null) ? e == null : x.equals(e)) |
193 |
return i; |
194 |
} |
195 |
} |
196 |
return -1; |
197 |
} |
198 |
|
199 |
final void rawAdd(E e) { |
200 |
int n = count; |
201 |
Object[] items = array; |
202 |
if (items == null || n >= items.length) |
203 |
items = grow(n + 1); |
204 |
items[n] = e; |
205 |
count = n + 1; |
206 |
} |
207 |
|
208 |
final void rawAddAt(int index, E e) { |
209 |
int n = count; |
210 |
Object[] items = array; |
211 |
if (index > n) |
212 |
throw new ArrayIndexOutOfBoundsException(index); |
213 |
if (items == null || n >= items.length) |
214 |
items = grow(n + 1); |
215 |
if (index < n) |
216 |
System.arraycopy(items, index, items, index + 1, n - index); |
217 |
items[index] = e; |
218 |
count = n + 1; |
219 |
} |
220 |
|
221 |
final boolean rawAddAllAt(int index, Object[] elements) { |
222 |
int n = count; |
223 |
Object[] items = array; |
224 |
if (index < 0 || index > n) |
225 |
throw new ArrayIndexOutOfBoundsException(index); |
226 |
int len = elements.length; |
227 |
if (len == 0) |
228 |
return false; |
229 |
int newCount = n + len; |
230 |
if (items == null || newCount >= items.length) |
231 |
items = grow(newCount); |
232 |
int mv = n - index; |
233 |
if (mv > 0) |
234 |
System.arraycopy(items, index, items, index + len, mv); |
235 |
System.arraycopy(elements, 0, items, index, len); |
236 |
count = newCount; |
237 |
return true; |
238 |
} |
239 |
|
240 |
final boolean rawRemoveAt(int index) { |
241 |
int n = count - 1; |
242 |
Object[] items = array; |
243 |
if (items == null || index < 0 || index > n) |
244 |
return false; |
245 |
int mv = n - index; |
246 |
if (mv > 0) |
247 |
System.arraycopy(items, index + 1, items, index, mv); |
248 |
items[n] = null; |
249 |
count = n; |
250 |
return true; |
251 |
} |
252 |
|
253 |
/** |
254 |
* Internal version of removeAll for lists and sublists. In this |
255 |
* and other similar methods below, the bound argument is, if |
256 |
* non-negative, the purported upper bound of a list/sublist, or |
257 |
* is left negative if the bound should be determined via count |
258 |
* field under lock. |
259 |
*/ |
260 |
final boolean lockedRemoveAll(Collection<?> c, int origin, int bound) { |
261 |
boolean removed = false; |
262 |
final StampedLock lock = this.lock; |
263 |
long stamp = lock.writeLock(); |
264 |
try { |
265 |
int n = count; |
266 |
int fence = bound < 0 || bound > n ? n : bound; |
267 |
if (origin >= 0 && origin < fence) { |
268 |
for (Object x : c) { |
269 |
while (rawRemoveAt(findFirstIndex(array, x, origin, fence))) |
270 |
removed = true; |
271 |
} |
272 |
} |
273 |
} finally { |
274 |
lock.unlockWrite(stamp); |
275 |
} |
276 |
return removed; |
277 |
} |
278 |
|
279 |
final boolean lockedRetainAll(Collection<?> c, int origin, int bound) { |
280 |
final StampedLock lock = this.lock; |
281 |
boolean removed = false; |
282 |
if (c != this) { |
283 |
long stamp = lock.writeLock(); |
284 |
try { |
285 |
Object[] items; |
286 |
int i, n; |
287 |
if ((items = array) != null && (n = count) > 0 && |
288 |
n < items.length && (i = origin) >= 0) { |
289 |
int fence = bound < 0 || bound > n ? n : bound; |
290 |
while (i < fence) { |
291 |
if (c.contains(items[i])) |
292 |
++i; |
293 |
else { |
294 |
--fence; |
295 |
int mv = --n - i; |
296 |
if (mv > 0) |
297 |
System.arraycopy(items, i + 1, items, i, mv); |
298 |
} |
299 |
} |
300 |
if (count != n) { |
301 |
count = n; |
302 |
removed = true; |
303 |
} |
304 |
} |
305 |
} finally { |
306 |
lock.unlockWrite(stamp); |
307 |
} |
308 |
} |
309 |
return removed; |
310 |
} |
311 |
|
312 |
final void internalClear(int origin, int bound) { |
313 |
Object[] items; |
314 |
int n, len; |
315 |
if ((items = array) != null && (len = items.length) > 0) { |
316 |
if (origin < 0) |
317 |
origin = 0; |
318 |
if ((n = count) > len) |
319 |
n = len; |
320 |
int fence = bound < 0 || bound > n ? n : bound; |
321 |
int removed = fence - origin; |
322 |
int newCount = n - removed; |
323 |
int mv = n - (origin + removed); |
324 |
if (mv > 0) |
325 |
System.arraycopy(items, origin + removed, items, origin, mv); |
326 |
for (int i = n; i < newCount; ++i) |
327 |
items[i] = null; |
328 |
count = newCount; |
329 |
} |
330 |
} |
331 |
|
332 |
final boolean internalContainsAll(Collection<?> c, int origin, int bound) { |
333 |
Object[] items; |
334 |
int n, len; |
335 |
if ((items = array) != null && (len = items.length) > 0) { |
336 |
if (origin < 0) |
337 |
origin = 0; |
338 |
if ((n = count) > len) |
339 |
n = len; |
340 |
int fence = bound < 0 || bound > n ? n : bound; |
341 |
for (Object e : c) { |
342 |
if (findFirstIndex(items, e, origin, fence) < 0) |
343 |
return false; |
344 |
} |
345 |
} |
346 |
else if (!c.isEmpty()) |
347 |
return false; |
348 |
return true; |
349 |
} |
350 |
|
351 |
final boolean internalEquals(List<?> list, int origin, int bound) { |
352 |
Object[] items; |
353 |
int n, len; |
354 |
if ((items = array) != null && (len = items.length) > 0) { |
355 |
if (origin < 0) |
356 |
origin = 0; |
357 |
if ((n = count) > len) |
358 |
n = len; |
359 |
int fence = bound < 0 || bound > n ? n : bound; |
360 |
Iterator<?> it = list.iterator(); |
361 |
for (int i = origin; i < fence; ++i) { |
362 |
if (!it.hasNext()) |
363 |
return false; |
364 |
Object y = it.next(); |
365 |
Object x = items[i]; |
366 |
if (x != y && (x == null || !x.equals(y))) |
367 |
return false; |
368 |
} |
369 |
if (it.hasNext()) |
370 |
return false; |
371 |
} |
372 |
else if (!list.isEmpty()) |
373 |
return false; |
374 |
return true; |
375 |
} |
376 |
|
377 |
final int internalHashCode(int origin, int bound) { |
378 |
int hash = 1; |
379 |
Object[] items; |
380 |
int n, len; |
381 |
if ((items = array) != null && (len = items.length) > 0) { |
382 |
if (origin < 0) |
383 |
origin = 0; |
384 |
if ((n = count) > len) |
385 |
n = len; |
386 |
int fence = bound < 0 || bound > n ? n : bound; |
387 |
for (int i = origin; i < fence; ++i) { |
388 |
Object e = items[i]; |
389 |
hash = 31*hash + (e == null ? 0 : e.hashCode()); |
390 |
} |
391 |
} |
392 |
return hash; |
393 |
} |
394 |
|
395 |
final String internalToString(int origin, int bound) { |
396 |
Object[] items; |
397 |
int n, len; |
398 |
if ((items = array) != null && (len = items.length) > 0) { |
399 |
if ((n = count) > len) |
400 |
n = len; |
401 |
int fence = bound < 0 || bound > n ? n : bound; |
402 |
int i = (origin < 0) ? 0 : origin; |
403 |
if (i != fence) { |
404 |
StringBuilder sb = new StringBuilder(); |
405 |
sb.append('['); |
406 |
for (;;) { |
407 |
Object e = items[i]; |
408 |
sb.append((e == this) ? "(this Collection)" : e.toString()); |
409 |
if (++i < fence) |
410 |
sb.append(',').append(' '); |
411 |
else |
412 |
return sb.append(']').toString(); |
413 |
} |
414 |
} |
415 |
} |
416 |
return "[]"; |
417 |
} |
418 |
|
419 |
final Object[] internalToArray(int origin, int bound) { |
420 |
Object[] items; |
421 |
int n, len; |
422 |
if ((items = array) != null && (len = items.length) > 0) { |
423 |
if (origin < 0) |
424 |
origin = 0; |
425 |
if ((n = count) > len) |
426 |
n = len; |
427 |
int fence = bound < 0 || bound > n ? n : bound; |
428 |
int i = (origin < 0) ? 0 : origin; |
429 |
if (i != fence) |
430 |
return Arrays.copyOfRange(items, i, fence, Object[].class); |
431 |
} |
432 |
return new Object[0]; |
433 |
} |
434 |
|
435 |
@SuppressWarnings("unchecked") |
436 |
final <T> T[] internalToArray(T[] a, int origin, int bound) { |
437 |
int alen = a.length; |
438 |
Object[] items; |
439 |
int n, len; |
440 |
if ((items = array) != null && (len = items.length) > 0) { |
441 |
if (origin < 0) |
442 |
origin = 0; |
443 |
if ((n = count) > len) |
444 |
n = len; |
445 |
int fence = bound < 0 || bound > n ? n : bound; |
446 |
int i = (origin < 0) ? 0 : origin; |
447 |
int rlen = fence - origin; |
448 |
if (rlen > 0) { |
449 |
if (alen >= rlen) { |
450 |
System.arraycopy(items, 0, a, origin, rlen); |
451 |
if (alen > rlen) |
452 |
a[rlen] = null; |
453 |
return a; |
454 |
} |
455 |
return (T[]) Arrays.copyOfRange(items, i, fence, a.getClass()); |
456 |
} |
457 |
} |
458 |
if (alen > 0) |
459 |
a[0] = null; |
460 |
return a; |
461 |
} |
462 |
|
463 |
// public List methods |
464 |
|
465 |
public boolean add(E e) { |
466 |
final StampedLock lock = this.lock; |
467 |
long stamp = lock.writeLock(); |
468 |
try { |
469 |
rawAdd(e); |
470 |
} finally { |
471 |
lock.unlockWrite(stamp); |
472 |
} |
473 |
return true; |
474 |
} |
475 |
|
476 |
public void add(int index, E element) { |
477 |
final StampedLock lock = this.lock; |
478 |
long stamp = lock.writeLock(); |
479 |
try { |
480 |
rawAddAt(index, element); |
481 |
} finally { |
482 |
lock.unlockWrite(stamp); |
483 |
} |
484 |
} |
485 |
|
486 |
public boolean addAll(Collection<? extends E> c) { |
487 |
Object[] elements = c.toArray(); |
488 |
int len = elements.length; |
489 |
if (len == 0) |
490 |
return false; |
491 |
final StampedLock lock = this.lock; |
492 |
long stamp = lock.writeLock(); |
493 |
try { |
494 |
Object[] items = array; |
495 |
int n = count; |
496 |
int newCount = n + len; |
497 |
if (items == null || newCount >= items.length) |
498 |
items = grow(newCount); |
499 |
System.arraycopy(elements, 0, items, n, len); |
500 |
count = newCount; |
501 |
} finally { |
502 |
lock.unlockWrite(stamp); |
503 |
} |
504 |
return true; |
505 |
} |
506 |
|
507 |
public boolean addAll(int index, Collection<? extends E> c) { |
508 |
Object[] elements = c.toArray(); |
509 |
boolean ret; |
510 |
final StampedLock lock = this.lock; |
511 |
long stamp = lock.writeLock(); |
512 |
try { |
513 |
ret = rawAddAllAt(index, elements); |
514 |
} finally { |
515 |
lock.unlockWrite(stamp); |
516 |
} |
517 |
return ret; |
518 |
} |
519 |
|
520 |
public void clear() { |
521 |
final StampedLock lock = this.lock; |
522 |
long stamp = lock.writeLock(); |
523 |
try { |
524 |
int n = count; |
525 |
Object[] items = array; |
526 |
if (items != null) { |
527 |
for (int i = 0; i < n; i++) |
528 |
items[i] = null; |
529 |
} |
530 |
count = 0; |
531 |
} finally { |
532 |
lock.unlockWrite(stamp); |
533 |
} |
534 |
} |
535 |
|
536 |
public boolean contains(Object o) { |
537 |
return indexOf(o, 0) >= 0; |
538 |
} |
539 |
|
540 |
public boolean containsAll(Collection<?> c) { |
541 |
boolean ret; |
542 |
final StampedLock lock = this.lock; |
543 |
long stamp = lock.readLock(); |
544 |
try { |
545 |
ret = internalContainsAll(c, 0, -1); |
546 |
} finally { |
547 |
lock.unlockRead(stamp); |
548 |
} |
549 |
return ret; |
550 |
} |
551 |
|
552 |
public boolean equals(Object o) { |
553 |
if (o == this) |
554 |
return true; |
555 |
if (!(o instanceof List)) |
556 |
return false; |
557 |
final StampedLock lock = this.lock; |
558 |
long stamp = lock.readLock(); |
559 |
try { |
560 |
return internalEquals((List<?>)o, 0, -1); |
561 |
} finally { |
562 |
lock.unlockRead(stamp); |
563 |
} |
564 |
} |
565 |
|
566 |
public E get(int index) { |
567 |
final StampedLock lock = this.lock; |
568 |
long stamp = lock.tryOptimisticRead(); |
569 |
Object[] items; |
570 |
if (index >= 0 && (items = array) != null && |
571 |
index < count && index < items.length) { |
572 |
@SuppressWarnings("unchecked") E e = (E)items[index]; |
573 |
if (lock.validate(stamp)) |
574 |
return e; |
575 |
} |
576 |
return lockedGet(index); |
577 |
} |
578 |
|
579 |
@SuppressWarnings("unchecked") private E lockedGet(int index) { |
580 |
boolean oobe = false; |
581 |
E e = null; |
582 |
final StampedLock lock = this.lock; |
583 |
long stamp = lock.readLock(); |
584 |
try { |
585 |
Object[] items; |
586 |
if ((items = array) != null && index < items.length && |
587 |
index < count && index >= 0) |
588 |
e = (E)items[index]; |
589 |
else |
590 |
oobe = true; |
591 |
} finally { |
592 |
lock.unlockRead(stamp); |
593 |
} |
594 |
if (oobe) |
595 |
throw new ArrayIndexOutOfBoundsException(index); |
596 |
return e; |
597 |
} |
598 |
|
599 |
public int hashCode() { |
600 |
int h; |
601 |
final StampedLock lock = this.lock; |
602 |
long s = lock.readLock(); |
603 |
try { |
604 |
h = internalHashCode(0, -1); |
605 |
} finally { |
606 |
lock.unlockRead(s); |
607 |
} |
608 |
return h; |
609 |
} |
610 |
|
611 |
public int indexOf(Object o) { |
612 |
int idx; |
613 |
final StampedLock lock = this.lock; |
614 |
long stamp = lock.readLock(); |
615 |
try { |
616 |
idx = findFirstIndex(array, o, 0, count); |
617 |
} finally { |
618 |
lock.unlockRead(stamp); |
619 |
} |
620 |
return idx; |
621 |
} |
622 |
|
623 |
public boolean isEmpty() { |
624 |
final StampedLock lock = this.lock; |
625 |
long stamp = lock.tryOptimisticRead(); |
626 |
return count == 0; // no need for validation |
627 |
} |
628 |
|
629 |
public Iterator<E> iterator() { |
630 |
return new Itr<E>(this, 0); |
631 |
} |
632 |
|
633 |
public int lastIndexOf(Object o) { |
634 |
int idx; |
635 |
final StampedLock lock = this.lock; |
636 |
long stamp = lock.readLock(); |
637 |
try { |
638 |
idx = findLastIndex(array, o, count - 1, 0); |
639 |
} finally { |
640 |
lock.unlockRead(stamp); |
641 |
} |
642 |
return idx; |
643 |
} |
644 |
|
645 |
public ListIterator<E> listIterator() { |
646 |
return new Itr<E>(this, 0); |
647 |
} |
648 |
|
649 |
public ListIterator<E> listIterator(int index) { |
650 |
return new Itr<E>(this, index); |
651 |
} |
652 |
|
653 |
@SuppressWarnings("unchecked") public E remove(int index) { |
654 |
E oldValue = null; |
655 |
boolean oobe = false; |
656 |
final StampedLock lock = this.lock; |
657 |
long stamp = lock.writeLock(); |
658 |
try { |
659 |
if (index < 0 || index >= count) |
660 |
oobe = true; |
661 |
else { |
662 |
oldValue = (E) array[index]; |
663 |
rawRemoveAt(index); |
664 |
} |
665 |
} finally { |
666 |
lock.unlockWrite(stamp); |
667 |
} |
668 |
if (oobe) |
669 |
throw new ArrayIndexOutOfBoundsException(index); |
670 |
return oldValue; |
671 |
} |
672 |
|
673 |
public boolean remove(Object o) { |
674 |
final StampedLock lock = this.lock; |
675 |
long stamp = lock.writeLock(); |
676 |
try { |
677 |
return rawRemoveAt(findFirstIndex(array, o, 0, count)); |
678 |
} finally { |
679 |
lock.unlockWrite(stamp); |
680 |
} |
681 |
} |
682 |
|
683 |
public boolean removeAll(Collection<?> c) { |
684 |
return lockedRemoveAll(c, 0, -1); |
685 |
} |
686 |
|
687 |
public boolean retainAll(Collection<?> c) { |
688 |
return lockedRetainAll(c, 0, -1); |
689 |
} |
690 |
|
691 |
@SuppressWarnings("unchecked") public E set(int index, E element) { |
692 |
E oldValue = null; |
693 |
boolean oobe = false; |
694 |
final StampedLock lock = this.lock; |
695 |
long stamp = lock.writeLock(); |
696 |
try { |
697 |
Object[] items = array; |
698 |
if (items == null || index < 0 || index >= count) |
699 |
oobe = true; |
700 |
else { |
701 |
oldValue = (E) items[index]; |
702 |
items[index] = element; |
703 |
} |
704 |
} finally { |
705 |
lock.unlockWrite(stamp); |
706 |
} |
707 |
if (oobe) |
708 |
throw new ArrayIndexOutOfBoundsException(index); |
709 |
return oldValue; |
710 |
} |
711 |
|
712 |
public int size() { |
713 |
final StampedLock lock = this.lock; |
714 |
long stamp = lock.tryOptimisticRead(); |
715 |
return count; // no need for validation |
716 |
} |
717 |
|
718 |
private int lockedSize() { |
719 |
int n; |
720 |
final StampedLock lock = this.lock; |
721 |
long stamp = lock.readLock(); |
722 |
try { |
723 |
n = count; |
724 |
} finally { |
725 |
lock.unlockRead(stamp); |
726 |
} |
727 |
return n; |
728 |
} |
729 |
|
730 |
public List<E> subList(int fromIndex, int toIndex) { |
731 |
int ssize = toIndex - fromIndex; |
732 |
if (ssize >= 0 && fromIndex >= 0) { |
733 |
ReadMostlyVectorSublist<E> ret = null; |
734 |
final StampedLock lock = this.lock; |
735 |
long stamp = lock.readLock(); |
736 |
try { |
737 |
if (toIndex <= count) |
738 |
ret = new ReadMostlyVectorSublist<E>(this, fromIndex, ssize); |
739 |
} finally { |
740 |
lock.unlockRead(stamp); |
741 |
} |
742 |
if (ret != null) |
743 |
return ret; |
744 |
} |
745 |
|
746 |
throw new ArrayIndexOutOfBoundsException(fromIndex < 0 ? fromIndex : toIndex); |
747 |
} |
748 |
|
749 |
public Object[] toArray() { |
750 |
final StampedLock lock = this.lock; |
751 |
long stamp = lock.readLock(); |
752 |
try { |
753 |
return internalToArray(0, -1); |
754 |
} finally { |
755 |
lock.unlockRead(stamp); |
756 |
} |
757 |
} |
758 |
|
759 |
public <T> T[] toArray(T[] a) { |
760 |
final StampedLock lock = this.lock; |
761 |
long stamp = lock.readLock(); |
762 |
try { |
763 |
return internalToArray(a, 0, -1); |
764 |
} finally { |
765 |
lock.unlockRead(stamp); |
766 |
} |
767 |
} |
768 |
|
769 |
public String toString() { |
770 |
final StampedLock lock = this.lock; |
771 |
long stamp = lock.readLock(); |
772 |
try { |
773 |
return internalToString(0, -1); |
774 |
} finally { |
775 |
lock.unlockRead(stamp); |
776 |
} |
777 |
} |
778 |
|
779 |
// ReadMostlyVector-only methods |
780 |
|
781 |
/** |
782 |
* Appends the element, if not present. |
783 |
* |
784 |
* @param e element to be added to this list, if absent |
785 |
* @return {@code true} if the element was added |
786 |
*/ |
787 |
public boolean addIfAbsent(E e) { |
788 |
boolean ret; |
789 |
final StampedLock lock = this.lock; |
790 |
long stamp = lock.writeLock(); |
791 |
try { |
792 |
if (findFirstIndex(array, e, 0, count) < 0) { |
793 |
rawAdd(e); |
794 |
ret = true; |
795 |
} |
796 |
else |
797 |
ret = false; |
798 |
} finally { |
799 |
lock.unlockWrite(stamp); |
800 |
} |
801 |
return ret; |
802 |
} |
803 |
|
804 |
/** |
805 |
* Appends all of the elements in the specified collection that |
806 |
* are not already contained in this list, to the end of |
807 |
* this list, in the order that they are returned by the |
808 |
* specified collection's iterator. |
809 |
* |
810 |
* @param c collection containing elements to be added to this list |
811 |
* @return the number of elements added |
812 |
* @throws NullPointerException if the specified collection is null |
813 |
* @see #addIfAbsent(Object) |
814 |
*/ |
815 |
public int addAllAbsent(Collection<? extends E> c) { |
816 |
int added = 0; |
817 |
Object[] cs = c.toArray(); |
818 |
int clen = cs.length; |
819 |
if (clen != 0) { |
820 |
long stamp = lock.writeLock(); |
821 |
try { |
822 |
for (int i = 0; i < clen; ++i) { |
823 |
@SuppressWarnings("unchecked") |
824 |
E e = (E) cs[i]; |
825 |
if (findFirstIndex(array, e, 0, count) < 0) { |
826 |
rawAdd(e); |
827 |
++added; |
828 |
} |
829 |
} |
830 |
} finally { |
831 |
lock.unlockWrite(stamp); |
832 |
} |
833 |
} |
834 |
return added; |
835 |
} |
836 |
|
837 |
/** |
838 |
* Returns an iterator operating over a snapshot copy of the |
839 |
* elements of this collection created upon construction of the |
840 |
* iterator. The iterator does <em>NOT</em> support the |
841 |
* {@code remove} method. |
842 |
* |
843 |
* @return an iterator over the elements in this list in proper sequence |
844 |
*/ |
845 |
public Iterator<E> snapshotIterator() { |
846 |
return new SnapshotIterator<E>(this); |
847 |
} |
848 |
|
849 |
static final class SnapshotIterator<E> implements Iterator<E> { |
850 |
private final Object[] items; |
851 |
private int cursor; |
852 |
SnapshotIterator(ReadMostlyVector<E> v) { items = v.toArray(); } |
853 |
public boolean hasNext() { return cursor < items.length; } |
854 |
@SuppressWarnings("unchecked") public E next() { |
855 |
if (cursor < items.length) |
856 |
return (E) items[cursor++]; |
857 |
throw new NoSuchElementException(); |
858 |
} |
859 |
public void remove() { throw new UnsupportedOperationException() ; } |
860 |
} |
861 |
|
862 |
/** Interface describing a void action of one argument */ |
863 |
public interface Action<A> { void apply(A a); } |
864 |
|
865 |
public void forEachReadOnly(Action<E> action) { |
866 |
final StampedLock lock = this.lock; |
867 |
long stamp = lock.readLock(); |
868 |
try { |
869 |
Object[] items; |
870 |
int len, n; |
871 |
if ((items = array) != null && (len = items.length) > 0 && |
872 |
(n = count) <= len) { |
873 |
for (int i = 0; i < n; ++i) { |
874 |
@SuppressWarnings("unchecked") E e = (E)items[i]; |
875 |
action.apply(e); |
876 |
} |
877 |
} |
878 |
} finally { |
879 |
lock.unlockRead(stamp); |
880 |
} |
881 |
} |
882 |
|
883 |
// Vector-only methods |
884 |
|
885 |
/** See {@link Vector#firstElement} */ |
886 |
public E firstElement() { |
887 |
final StampedLock lock = this.lock; |
888 |
long stamp = lock.tryOptimisticRead(); |
889 |
Object[] items; |
890 |
if ((items = array) != null && count > 0 && items.length > 0) { |
891 |
@SuppressWarnings("unchecked") E e = (E)items[0]; |
892 |
if (lock.validate(stamp)) |
893 |
return e; |
894 |
} |
895 |
return lockedFirstElement(); |
896 |
} |
897 |
|
898 |
@SuppressWarnings("unchecked") private E lockedFirstElement() { |
899 |
Object e = null; |
900 |
boolean oobe = false; |
901 |
final StampedLock lock = this.lock; |
902 |
long stamp = lock.readLock(); |
903 |
try { |
904 |
Object[] items = array; |
905 |
if (items != null && count > 0 && items.length > 0) |
906 |
e = items[0]; |
907 |
else |
908 |
oobe = true; |
909 |
} finally { |
910 |
lock.unlockRead(stamp); |
911 |
} |
912 |
if (oobe) |
913 |
throw new NoSuchElementException(); |
914 |
return (E) e; |
915 |
} |
916 |
|
917 |
/** See {@link Vector#lastElement} */ |
918 |
public E lastElement() { |
919 |
final StampedLock lock = this.lock; |
920 |
long stamp = lock.tryOptimisticRead(); |
921 |
Object[] items; |
922 |
int i; |
923 |
if ((items = array) != null && (i = count - 1) >= 0 && |
924 |
i < items.length) { |
925 |
@SuppressWarnings("unchecked") E e = (E)items[i]; |
926 |
if (lock.validate(stamp)) |
927 |
return e; |
928 |
} |
929 |
return lockedLastElement(); |
930 |
} |
931 |
|
932 |
@SuppressWarnings("unchecked") private E lockedLastElement() { |
933 |
Object e = null; |
934 |
boolean oobe = false; |
935 |
final StampedLock lock = this.lock; |
936 |
long stamp = lock.readLock(); |
937 |
try { |
938 |
Object[] items = array; |
939 |
int i = count - 1; |
940 |
if (items != null && i >= 0 && i < items.length) |
941 |
e = items[i]; |
942 |
else |
943 |
oobe = true; |
944 |
} finally { |
945 |
lock.unlockRead(stamp); |
946 |
} |
947 |
if (oobe) |
948 |
throw new NoSuchElementException(); |
949 |
return (E) e; |
950 |
} |
951 |
|
952 |
/** See {@link Vector#indexOf(Object, int)} */ |
953 |
public int indexOf(Object o, int index) { |
954 |
if (index < 0) |
955 |
throw new ArrayIndexOutOfBoundsException(index); |
956 |
int idx; |
957 |
final StampedLock lock = this.lock; |
958 |
long stamp = lock.readLock(); |
959 |
try { |
960 |
idx = findFirstIndex(array, o, index, count); |
961 |
} finally { |
962 |
lock.unlockRead(stamp); |
963 |
} |
964 |
return idx; |
965 |
} |
966 |
|
967 |
/** See {@link Vector#lastIndexOf(Object, int)} */ |
968 |
public int lastIndexOf(Object o, int index) { |
969 |
boolean oobe = false; |
970 |
int idx = -1; |
971 |
final StampedLock lock = this.lock; |
972 |
long stamp = lock.readLock(); |
973 |
try { |
974 |
if (index < count) |
975 |
idx = findLastIndex(array, o, index, 0); |
976 |
else |
977 |
oobe = true; |
978 |
} finally { |
979 |
lock.unlockRead(stamp); |
980 |
} |
981 |
if (oobe) |
982 |
throw new ArrayIndexOutOfBoundsException(index); |
983 |
return idx; |
984 |
} |
985 |
|
986 |
/** See {@link Vector#setSize} */ |
987 |
public void setSize(int newSize) { |
988 |
if (newSize < 0) |
989 |
throw new ArrayIndexOutOfBoundsException(newSize); |
990 |
final StampedLock lock = this.lock; |
991 |
long stamp = lock.writeLock(); |
992 |
try { |
993 |
Object[] items; |
994 |
int n = count; |
995 |
if (newSize > n) |
996 |
grow(newSize); |
997 |
else if ((items = array) != null) { |
998 |
for (int i = newSize ; i < n ; i++) |
999 |
items[i] = null; |
1000 |
} |
1001 |
count = newSize; |
1002 |
} finally { |
1003 |
lock.unlockWrite(stamp); |
1004 |
} |
1005 |
} |
1006 |
|
1007 |
/** See {@link Vector#copyInto} */ |
1008 |
public void copyInto(Object[] anArray) { |
1009 |
final StampedLock lock = this.lock; |
1010 |
long stamp = lock.writeLock(); |
1011 |
try { |
1012 |
Object[] items; |
1013 |
if ((items = array) != null) |
1014 |
System.arraycopy(items, 0, anArray, 0, count); |
1015 |
} finally { |
1016 |
lock.unlockWrite(stamp); |
1017 |
} |
1018 |
} |
1019 |
|
1020 |
/** See {@link Vector#trimToSize} */ |
1021 |
public void trimToSize() { |
1022 |
final StampedLock lock = this.lock; |
1023 |
long stamp = lock.writeLock(); |
1024 |
try { |
1025 |
Object[] items = array; |
1026 |
int n = count; |
1027 |
if (items != null && n < items.length) |
1028 |
array = Arrays.copyOf(items, n); |
1029 |
} finally { |
1030 |
lock.unlockWrite(stamp); |
1031 |
} |
1032 |
} |
1033 |
|
1034 |
/** See {@link Vector#ensureCapacity} */ |
1035 |
public void ensureCapacity(int minCapacity) { |
1036 |
if (minCapacity > 0) { |
1037 |
final StampedLock lock = this.lock; |
1038 |
long stamp = lock.writeLock(); |
1039 |
try { |
1040 |
Object[] items = array; |
1041 |
int cap = (items == null) ? 0 : items.length; |
1042 |
if (minCapacity - cap > 0) |
1043 |
grow(minCapacity); |
1044 |
} finally { |
1045 |
lock.unlockWrite(stamp); |
1046 |
} |
1047 |
} |
1048 |
} |
1049 |
|
1050 |
/** See {@link Vector#elements} */ |
1051 |
public Enumeration<E> elements() { |
1052 |
return new Itr<E>(this, 0); |
1053 |
} |
1054 |
|
1055 |
/** See {@link Vector#capacity} */ |
1056 |
public int capacity() { |
1057 |
return array.length; |
1058 |
} |
1059 |
|
1060 |
/** See {@link Vector#elementAt} */ |
1061 |
public E elementAt(int index) { |
1062 |
return get(index); |
1063 |
} |
1064 |
|
1065 |
/** See {@link Vector#setElementAt} */ |
1066 |
public void setElementAt(E obj, int index) { |
1067 |
set(index, obj); |
1068 |
} |
1069 |
|
1070 |
/** See {@link Vector#removeElementAt} */ |
1071 |
public void removeElementAt(int index) { |
1072 |
remove(index); |
1073 |
} |
1074 |
|
1075 |
/** See {@link Vector#insertElementAt} */ |
1076 |
public void insertElementAt(E obj, int index) { |
1077 |
add(index, obj); |
1078 |
} |
1079 |
|
1080 |
/** See {@link Vector#addElement} */ |
1081 |
public void addElement(E obj) { |
1082 |
add(obj); |
1083 |
} |
1084 |
|
1085 |
/** See {@link Vector#removeElement} */ |
1086 |
public boolean removeElement(Object obj) { |
1087 |
return remove(obj); |
1088 |
} |
1089 |
|
1090 |
/** See {@link Vector#removeAllElements} */ |
1091 |
public void removeAllElements() { |
1092 |
clear(); |
1093 |
} |
1094 |
|
1095 |
// other methods |
1096 |
|
1097 |
public ReadMostlyVector<E> clone() { |
1098 |
Object[] a = null; |
1099 |
int n; |
1100 |
final StampedLock lock = this.lock; |
1101 |
long stamp = lock.readLock(); |
1102 |
try { |
1103 |
Object[] items = array; |
1104 |
if (items == null) |
1105 |
n = 0; |
1106 |
else { |
1107 |
int len = items.length; |
1108 |
if ((n = count) > len) |
1109 |
n = len; |
1110 |
a = Arrays.copyOf(items, n); |
1111 |
} |
1112 |
} finally { |
1113 |
lock.unlockRead(stamp); |
1114 |
} |
1115 |
return new ReadMostlyVector<E>(a, n, capacityIncrement); |
1116 |
} |
1117 |
|
1118 |
private void writeObject(java.io.ObjectOutputStream s) |
1119 |
throws java.io.IOException { |
1120 |
final StampedLock lock = this.lock; |
1121 |
long stamp = lock.readLock(); |
1122 |
try { |
1123 |
s.defaultWriteObject(); |
1124 |
} finally { |
1125 |
lock.unlockRead(stamp); |
1126 |
} |
1127 |
} |
1128 |
|
1129 |
static final class Itr<E> implements ListIterator<E>, Enumeration<E> { |
1130 |
final StampedLock lock; |
1131 |
final ReadMostlyVector<E> list; |
1132 |
Object[] items; |
1133 |
long seq; |
1134 |
int cursor; |
1135 |
int fence; |
1136 |
int lastRet; |
1137 |
|
1138 |
Itr(ReadMostlyVector<E> list, int index) { |
1139 |
final StampedLock lock = list.lock; |
1140 |
long stamp = lock.readLock(); |
1141 |
try { |
1142 |
this.list = list; |
1143 |
this.lock = lock; |
1144 |
this.items = list.array; |
1145 |
this.fence = list.count; |
1146 |
this.cursor = index; |
1147 |
this.lastRet = -1; |
1148 |
} finally { |
1149 |
this.seq = lock.tryConvertToOptimisticRead(stamp); |
1150 |
} |
1151 |
if (index < 0 || index > fence) |
1152 |
throw new ArrayIndexOutOfBoundsException(index); |
1153 |
} |
1154 |
|
1155 |
public boolean hasPrevious() { |
1156 |
return cursor > 0; |
1157 |
} |
1158 |
|
1159 |
public int nextIndex() { |
1160 |
return cursor; |
1161 |
} |
1162 |
|
1163 |
public int previousIndex() { |
1164 |
return cursor - 1; |
1165 |
} |
1166 |
|
1167 |
public boolean hasNext() { |
1168 |
return cursor < fence; |
1169 |
} |
1170 |
|
1171 |
public E next() { |
1172 |
int i = cursor; |
1173 |
Object[] es = items; |
1174 |
if (es == null || i < 0 || i >= fence || i >= es.length) |
1175 |
throw new NoSuchElementException(); |
1176 |
@SuppressWarnings("unchecked") E e = (E)es[i]; |
1177 |
lastRet = i; |
1178 |
cursor = i + 1; |
1179 |
if (!lock.validate(seq)) |
1180 |
throw new ConcurrentModificationException(); |
1181 |
return e; |
1182 |
} |
1183 |
|
1184 |
public E previous() { |
1185 |
int i = cursor - 1; |
1186 |
Object[] es = items; |
1187 |
if (es == null || i < 0 || i >= fence || i >= es.length) |
1188 |
throw new NoSuchElementException(); |
1189 |
@SuppressWarnings("unchecked") E e = (E)es[i]; |
1190 |
lastRet = i; |
1191 |
cursor = i; |
1192 |
if (!lock.validate(seq)) |
1193 |
throw new ConcurrentModificationException(); |
1194 |
return e; |
1195 |
} |
1196 |
|
1197 |
public void remove() { |
1198 |
int i = lastRet; |
1199 |
if (i < 0) |
1200 |
throw new IllegalStateException(); |
1201 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1202 |
throw new ConcurrentModificationException(); |
1203 |
try { |
1204 |
list.rawRemoveAt(i); |
1205 |
fence = list.count; |
1206 |
cursor = i; |
1207 |
lastRet = -1; |
1208 |
} finally { |
1209 |
seq = lock.tryConvertToOptimisticRead(seq); |
1210 |
} |
1211 |
} |
1212 |
|
1213 |
public void set(E e) { |
1214 |
int i = lastRet; |
1215 |
Object[] es = items; |
1216 |
if (es == null || i < 0 | i >= fence) |
1217 |
throw new IllegalStateException(); |
1218 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1219 |
throw new ConcurrentModificationException(); |
1220 |
try { |
1221 |
es[i] = e; |
1222 |
} finally { |
1223 |
seq = lock.tryConvertToOptimisticRead(seq); |
1224 |
} |
1225 |
} |
1226 |
|
1227 |
public void add(E e) { |
1228 |
int i = cursor; |
1229 |
if (i < 0) |
1230 |
throw new IllegalStateException(); |
1231 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1232 |
throw new ConcurrentModificationException(); |
1233 |
try { |
1234 |
list.rawAddAt(i, e); |
1235 |
items = list.array; |
1236 |
fence = list.count; |
1237 |
cursor = i + 1; |
1238 |
lastRet = -1; |
1239 |
} finally { |
1240 |
seq = lock.tryConvertToOptimisticRead(seq); |
1241 |
} |
1242 |
} |
1243 |
|
1244 |
public boolean hasMoreElements() { return hasNext(); } |
1245 |
public E nextElement() { return next(); } |
1246 |
} |
1247 |
|
1248 |
static final class ReadMostlyVectorSublist<E> |
1249 |
implements List<E>, RandomAccess, java.io.Serializable { |
1250 |
private static final long serialVersionUID = 3041673470172026059L; |
1251 |
|
1252 |
final ReadMostlyVector<E> list; |
1253 |
final int offset; |
1254 |
volatile int size; |
1255 |
|
1256 |
ReadMostlyVectorSublist(ReadMostlyVector<E> list, |
1257 |
int offset, int size) { |
1258 |
this.list = list; |
1259 |
this.offset = offset; |
1260 |
this.size = size; |
1261 |
} |
1262 |
|
1263 |
private void rangeCheck(int index) { |
1264 |
if (index < 0 || index >= size) |
1265 |
throw new ArrayIndexOutOfBoundsException(index); |
1266 |
} |
1267 |
|
1268 |
public boolean add(E element) { |
1269 |
final StampedLock lock = list.lock; |
1270 |
long stamp = lock.writeLock(); |
1271 |
try { |
1272 |
int c = size; |
1273 |
list.rawAddAt(c + offset, element); |
1274 |
size = c + 1; |
1275 |
} finally { |
1276 |
lock.unlockWrite(stamp); |
1277 |
} |
1278 |
return true; |
1279 |
} |
1280 |
|
1281 |
public void add(int index, E element) { |
1282 |
final StampedLock lock = list.lock; |
1283 |
long stamp = lock.writeLock(); |
1284 |
try { |
1285 |
if (index < 0 || index > size) |
1286 |
throw new ArrayIndexOutOfBoundsException(index); |
1287 |
list.rawAddAt(index + offset, element); |
1288 |
++size; |
1289 |
} finally { |
1290 |
lock.unlockWrite(stamp); |
1291 |
} |
1292 |
} |
1293 |
|
1294 |
public boolean addAll(Collection<? extends E> c) { |
1295 |
Object[] elements = c.toArray(); |
1296 |
final StampedLock lock = list.lock; |
1297 |
long stamp = lock.writeLock(); |
1298 |
try { |
1299 |
int s = size; |
1300 |
int pc = list.count; |
1301 |
list.rawAddAllAt(offset + s, elements); |
1302 |
int added = list.count - pc; |
1303 |
size = s + added; |
1304 |
return added != 0; |
1305 |
} finally { |
1306 |
lock.unlockWrite(stamp); |
1307 |
} |
1308 |
} |
1309 |
|
1310 |
public boolean addAll(int index, Collection<? extends E> c) { |
1311 |
Object[] elements = c.toArray(); |
1312 |
final StampedLock lock = list.lock; |
1313 |
long stamp = lock.writeLock(); |
1314 |
try { |
1315 |
int s = size; |
1316 |
if (index < 0 || index > s) |
1317 |
throw new ArrayIndexOutOfBoundsException(index); |
1318 |
int pc = list.count; |
1319 |
list.rawAddAllAt(index + offset, elements); |
1320 |
int added = list.count - pc; |
1321 |
size = s + added; |
1322 |
return added != 0; |
1323 |
} finally { |
1324 |
lock.unlockWrite(stamp); |
1325 |
} |
1326 |
} |
1327 |
|
1328 |
public void clear() { |
1329 |
final StampedLock lock = list.lock; |
1330 |
long stamp = lock.writeLock(); |
1331 |
try { |
1332 |
list.internalClear(offset, offset + size); |
1333 |
size = 0; |
1334 |
} finally { |
1335 |
lock.unlockWrite(stamp); |
1336 |
} |
1337 |
} |
1338 |
|
1339 |
public boolean contains(Object o) { |
1340 |
return indexOf(o) >= 0; |
1341 |
} |
1342 |
|
1343 |
public boolean containsAll(Collection<?> c) { |
1344 |
final StampedLock lock = list.lock; |
1345 |
long stamp = lock.readLock(); |
1346 |
try { |
1347 |
return list.internalContainsAll(c, offset, offset + size); |
1348 |
} finally { |
1349 |
lock.unlockRead(stamp); |
1350 |
} |
1351 |
} |
1352 |
|
1353 |
public boolean equals(Object o) { |
1354 |
if (o == this) |
1355 |
return true; |
1356 |
if (!(o instanceof List)) |
1357 |
return false; |
1358 |
final StampedLock lock = list.lock; |
1359 |
long stamp = lock.readLock(); |
1360 |
try { |
1361 |
return list.internalEquals((List<?>)(o), offset, offset + size); |
1362 |
} finally { |
1363 |
lock.unlockRead(stamp); |
1364 |
} |
1365 |
} |
1366 |
|
1367 |
public E get(int index) { |
1368 |
if (index < 0 || index >= size) |
1369 |
throw new ArrayIndexOutOfBoundsException(index); |
1370 |
return list.get(index + offset); |
1371 |
} |
1372 |
|
1373 |
public int hashCode() { |
1374 |
final StampedLock lock = list.lock; |
1375 |
long stamp = lock.readLock(); |
1376 |
try { |
1377 |
return list.internalHashCode(offset, offset + size); |
1378 |
} finally { |
1379 |
lock.unlockRead(stamp); |
1380 |
} |
1381 |
} |
1382 |
|
1383 |
public int indexOf(Object o) { |
1384 |
final StampedLock lock = list.lock; |
1385 |
long stamp = lock.readLock(); |
1386 |
try { |
1387 |
int idx = findFirstIndex(list.array, o, offset, offset + size); |
1388 |
return idx < 0 ? -1 : idx - offset; |
1389 |
} finally { |
1390 |
lock.unlockRead(stamp); |
1391 |
} |
1392 |
} |
1393 |
|
1394 |
public boolean isEmpty() { |
1395 |
return size() == 0; |
1396 |
} |
1397 |
|
1398 |
public Iterator<E> iterator() { |
1399 |
return new SubItr<E>(this, offset); |
1400 |
} |
1401 |
|
1402 |
public int lastIndexOf(Object o) { |
1403 |
final StampedLock lock = list.lock; |
1404 |
long stamp = lock.readLock(); |
1405 |
try { |
1406 |
int idx = findLastIndex(list.array, o, offset + size - 1, offset); |
1407 |
return idx < 0 ? -1 : idx - offset; |
1408 |
} finally { |
1409 |
lock.unlockRead(stamp); |
1410 |
} |
1411 |
} |
1412 |
|
1413 |
public ListIterator<E> listIterator() { |
1414 |
return new SubItr<E>(this, offset); |
1415 |
} |
1416 |
|
1417 |
public ListIterator<E> listIterator(int index) { |
1418 |
return new SubItr<E>(this, index + offset); |
1419 |
} |
1420 |
|
1421 |
public E remove(int index) { |
1422 |
final StampedLock lock = list.lock; |
1423 |
long stamp = lock.writeLock(); |
1424 |
try { |
1425 |
Object[] items = list.array; |
1426 |
int i = index + offset; |
1427 |
if (items == null || index < 0 || index >= size || i >= items.length) |
1428 |
throw new ArrayIndexOutOfBoundsException(index); |
1429 |
@SuppressWarnings("unchecked") E result = (E)items[i]; |
1430 |
list.rawRemoveAt(i); |
1431 |
size--; |
1432 |
return result; |
1433 |
} finally { |
1434 |
lock.unlockWrite(stamp); |
1435 |
} |
1436 |
} |
1437 |
|
1438 |
public boolean remove(Object o) { |
1439 |
final StampedLock lock = list.lock; |
1440 |
long stamp = lock.writeLock(); |
1441 |
try { |
1442 |
if (list.rawRemoveAt(findFirstIndex(list.array, o, offset, |
1443 |
offset + size))) { |
1444 |
--size; |
1445 |
return true; |
1446 |
} |
1447 |
else |
1448 |
return false; |
1449 |
} finally { |
1450 |
lock.unlockWrite(stamp); |
1451 |
} |
1452 |
} |
1453 |
|
1454 |
public boolean removeAll(Collection<?> c) { |
1455 |
return list.lockedRemoveAll(c, offset, offset + size); |
1456 |
} |
1457 |
|
1458 |
public boolean retainAll(Collection<?> c) { |
1459 |
return list.lockedRetainAll(c, offset, offset + size); |
1460 |
} |
1461 |
|
1462 |
public E set(int index, E element) { |
1463 |
if (index < 0 || index >= size) |
1464 |
throw new ArrayIndexOutOfBoundsException(index); |
1465 |
return list.set(index+offset, element); |
1466 |
} |
1467 |
|
1468 |
public int size() { |
1469 |
return size; |
1470 |
} |
1471 |
|
1472 |
public List<E> subList(int fromIndex, int toIndex) { |
1473 |
int c = size; |
1474 |
int ssize = toIndex - fromIndex; |
1475 |
if (fromIndex < 0) |
1476 |
throw new ArrayIndexOutOfBoundsException(fromIndex); |
1477 |
if (toIndex > c || ssize < 0) |
1478 |
throw new ArrayIndexOutOfBoundsException(toIndex); |
1479 |
return new ReadMostlyVectorSublist<E>(list, offset+fromIndex, ssize); |
1480 |
} |
1481 |
|
1482 |
public Object[] toArray() { |
1483 |
final StampedLock lock = list.lock; |
1484 |
long stamp = lock.readLock(); |
1485 |
try { |
1486 |
return list.internalToArray(offset, offset + size); |
1487 |
} finally { |
1488 |
lock.unlockRead(stamp); |
1489 |
} |
1490 |
} |
1491 |
|
1492 |
public <T> T[] toArray(T[] a) { |
1493 |
final StampedLock lock = list.lock; |
1494 |
long stamp = lock.readLock(); |
1495 |
try { |
1496 |
return list.internalToArray(a, offset, offset + size); |
1497 |
} finally { |
1498 |
lock.unlockRead(stamp); |
1499 |
} |
1500 |
} |
1501 |
|
1502 |
public String toString() { |
1503 |
final StampedLock lock = list.lock; |
1504 |
long stamp = lock.readLock(); |
1505 |
try { |
1506 |
return list.internalToString(offset, offset + size); |
1507 |
} finally { |
1508 |
lock.unlockRead(stamp); |
1509 |
} |
1510 |
} |
1511 |
|
1512 |
} |
1513 |
|
1514 |
static final class SubItr<E> implements ListIterator<E> { |
1515 |
final ReadMostlyVectorSublist<E> sublist; |
1516 |
final ReadMostlyVector<E> list; |
1517 |
final StampedLock lock; |
1518 |
Object[] items; |
1519 |
long seq; |
1520 |
int cursor; |
1521 |
int origin; |
1522 |
int fence; |
1523 |
int lastRet; |
1524 |
|
1525 |
SubItr(ReadMostlyVectorSublist<E> sublist, int index) { |
1526 |
final StampedLock lock = sublist.list.lock; |
1527 |
long stamp = lock.readLock(); |
1528 |
try { |
1529 |
this.sublist = sublist; |
1530 |
this.list = sublist.list; |
1531 |
this.lock = lock; |
1532 |
this.cursor = index; |
1533 |
this.origin = sublist.offset; |
1534 |
this.fence = origin + sublist.size; |
1535 |
this.lastRet = -1; |
1536 |
} finally { |
1537 |
this.seq = lock.tryConvertToOptimisticRead(stamp); |
1538 |
} |
1539 |
if (index < 0 || cursor > fence) |
1540 |
throw new ArrayIndexOutOfBoundsException(index); |
1541 |
} |
1542 |
|
1543 |
public int nextIndex() { |
1544 |
return cursor - origin; |
1545 |
} |
1546 |
|
1547 |
public int previousIndex() { |
1548 |
return cursor - origin - 1; |
1549 |
} |
1550 |
|
1551 |
public boolean hasNext() { |
1552 |
return cursor < fence; |
1553 |
} |
1554 |
|
1555 |
public boolean hasPrevious() { |
1556 |
return cursor > origin; |
1557 |
} |
1558 |
|
1559 |
public E next() { |
1560 |
int i = cursor; |
1561 |
Object[] es = items; |
1562 |
if (es == null || i < origin || i >= fence || i >= es.length) |
1563 |
throw new NoSuchElementException(); |
1564 |
@SuppressWarnings("unchecked") E e = (E)es[i]; |
1565 |
lastRet = i; |
1566 |
cursor = i + 1; |
1567 |
if (!lock.validate(seq)) |
1568 |
throw new ConcurrentModificationException(); |
1569 |
return e; |
1570 |
} |
1571 |
|
1572 |
public E previous() { |
1573 |
int i = cursor - 1; |
1574 |
Object[] es = items; |
1575 |
if (es == null || i < 0 || i >= fence || i >= es.length) |
1576 |
throw new NoSuchElementException(); |
1577 |
@SuppressWarnings("unchecked") E e = (E)es[i]; |
1578 |
lastRet = i; |
1579 |
cursor = i; |
1580 |
if (!lock.validate(seq)) |
1581 |
throw new ConcurrentModificationException(); |
1582 |
return e; |
1583 |
} |
1584 |
|
1585 |
public void remove() { |
1586 |
int i = lastRet; |
1587 |
if (i < 0) |
1588 |
throw new IllegalStateException(); |
1589 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1590 |
throw new ConcurrentModificationException(); |
1591 |
try { |
1592 |
list.rawRemoveAt(i); |
1593 |
fence = origin + sublist.size; |
1594 |
cursor = i; |
1595 |
lastRet = -1; |
1596 |
} finally { |
1597 |
seq = lock.tryConvertToOptimisticRead(seq); |
1598 |
} |
1599 |
} |
1600 |
|
1601 |
public void set(E e) { |
1602 |
int i = lastRet; |
1603 |
if (i < origin || i >= fence) |
1604 |
throw new IllegalStateException(); |
1605 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1606 |
throw new ConcurrentModificationException(); |
1607 |
try { |
1608 |
list.set(i, e); |
1609 |
} finally { |
1610 |
seq = lock.tryConvertToOptimisticRead(seq); |
1611 |
} |
1612 |
} |
1613 |
|
1614 |
public void add(E e) { |
1615 |
int i = cursor; |
1616 |
if (i < origin || i >= fence) |
1617 |
throw new IllegalStateException(); |
1618 |
if ((seq = lock.tryConvertToWriteLock(seq)) == 0) |
1619 |
throw new ConcurrentModificationException(); |
1620 |
try { |
1621 |
list.rawAddAt(i, e); |
1622 |
items = list.array; |
1623 |
fence = origin + sublist.size; |
1624 |
cursor = i + 1; |
1625 |
lastRet = -1; |
1626 |
} finally { |
1627 |
seq = lock.tryConvertToOptimisticRead(seq); |
1628 |
} |
1629 |
} |
1630 |
} |
1631 |
} |