134 |
|
* to ensure that it can hold at least the given number of elements. |
135 |
|
* |
136 |
|
* @param minCapacity the desired minimum capacity |
137 |
< |
* @since 9 |
137 |
> |
* @since TBD |
138 |
|
*/ |
139 |
< |
public void ensureCapacity(int minCapacity) { |
139 |
> |
/* public */ void ensureCapacity(int minCapacity) { |
140 |
|
if (minCapacity > elements.length) |
141 |
|
grow(minCapacity - elements.length); |
142 |
|
// checkInvariants(); |
145 |
|
/** |
146 |
|
* Minimizes the internal storage of this collection. |
147 |
|
* |
148 |
< |
* @since 9 |
148 |
> |
* @since TBD |
149 |
|
*/ |
150 |
< |
public void trimToSize() { |
150 |
> |
/* public */ void trimToSize() { |
151 |
|
if (size < elements.length) { |
152 |
|
elements = toArray(); |
153 |
|
head = 0; |
187 |
|
Object[] elements = c.toArray(); |
188 |
|
// defend against c.toArray (incorrectly) not returning Object[] |
189 |
|
// (see e.g. https://bugs.openjdk.java.net/browse/JDK-6260652) |
190 |
+ |
size = elements.length; |
191 |
|
if (elements.getClass() != Object[].class) |
192 |
|
elements = Arrays.copyOf(elements, size, Object[].class); |
193 |
|
for (Object obj : elements) |
194 |
|
Objects.requireNonNull(obj); |
194 |
– |
size = elements.length; |
195 |
|
this.elements = elements; |
196 |
|
} |
197 |
|
|
198 |
|
/** |
199 |
< |
* Returns the array index of the last element. |
200 |
< |
* May return invalid index -1 if there are no elements. |
199 |
> |
* Increments i, mod modulus. |
200 |
> |
* Precondition and postcondition: 0 <= i < modulus. |
201 |
|
*/ |
202 |
< |
final int tail() { |
203 |
< |
return add(head, size - 1, elements.length); |
202 |
> |
static final int inc(int i, int modulus) { |
203 |
> |
if (++i >= modulus) i = 0; |
204 |
> |
return i; |
205 |
|
} |
206 |
|
|
207 |
|
/** |
208 |
< |
* Adds i and j, mod modulus. |
209 |
< |
* Precondition and postcondition: 0 <= i < modulus, 0 <= j <= modulus. |
208 |
> |
* Decrements i, mod modulus. |
209 |
> |
* Precondition and postcondition: 0 <= i < modulus. |
210 |
|
*/ |
211 |
< |
static final int add(int i, int j, int modulus) { |
212 |
< |
if ((i += j) - modulus >= 0) i -= modulus; |
211 |
> |
static final int dec(int i, int modulus) { |
212 |
> |
if (--i < 0) i = modulus - 1; |
213 |
|
return i; |
214 |
|
} |
215 |
|
|
216 |
|
/** |
217 |
< |
* Increments i, mod modulus. |
218 |
< |
* Precondition and postcondition: 0 <= i < modulus. |
217 |
> |
* Adds i and j, mod modulus. |
218 |
> |
* Precondition and postcondition: 0 <= i < modulus, 0 <= j <= modulus. |
219 |
|
*/ |
220 |
< |
static final int inc(int i, int modulus) { |
221 |
< |
if (++i == modulus) i = 0; |
220 |
> |
static final int add(int i, int j, int modulus) { |
221 |
> |
if ((i += j) - modulus >= 0) i -= modulus; |
222 |
|
return i; |
223 |
|
} |
224 |
|
|
225 |
|
/** |
226 |
< |
* Decrements i, mod modulus. |
227 |
< |
* Precondition and postcondition: 0 <= i < modulus. |
226 |
> |
* Returns the array index of the last element. |
227 |
> |
* May return invalid index -1 if there are no elements. |
228 |
|
*/ |
229 |
< |
static final int dec(int i, int modulus) { |
230 |
< |
if (--i < 0) i += modulus; |
230 |
< |
return i; |
229 |
> |
final int tail() { |
230 |
> |
return add(head, size - 1, elements.length); |
231 |
|
} |
232 |
|
|
233 |
|
/** |
234 |
|
* Returns element at array index i. |
235 |
|
*/ |
236 |
|
@SuppressWarnings("unchecked") |
237 |
< |
final E elementAt(int i) { |
237 |
> |
private E elementAt(int i) { |
238 |
|
return (E) elements[i]; |
239 |
|
} |
240 |
|
|
264 |
|
// checkInvariants(); |
265 |
|
Objects.requireNonNull(e); |
266 |
|
Object[] elements; |
267 |
< |
int capacity, s = size; |
268 |
< |
while (s == (capacity = (elements = this.elements).length)) |
267 |
> |
int capacity, h; |
268 |
> |
final int s; |
269 |
> |
if ((s = size) == (capacity = (elements = this.elements).length)) { |
270 |
|
grow(1); |
271 |
< |
elements[head = dec(head, capacity)] = e; |
271 |
> |
capacity = (elements = this.elements).length; |
272 |
> |
} |
273 |
> |
if ((h = head - 1) < 0) h = capacity - 1; |
274 |
> |
elements[head = h] = e; |
275 |
|
size = s + 1; |
276 |
+ |
// checkInvariants(); |
277 |
|
} |
278 |
|
|
279 |
|
/** |
288 |
|
// checkInvariants(); |
289 |
|
Objects.requireNonNull(e); |
290 |
|
Object[] elements; |
291 |
< |
int capacity, s = size; |
292 |
< |
while (s == (capacity = (elements = this.elements).length)) |
291 |
> |
int capacity; |
292 |
> |
final int s; |
293 |
> |
if ((s = size) == (capacity = (elements = this.elements).length)) { |
294 |
|
grow(1); |
295 |
+ |
capacity = (elements = this.elements).length; |
296 |
+ |
} |
297 |
|
elements[add(head, s, capacity)] = e; |
298 |
|
size = s + 1; |
299 |
+ |
// checkInvariants(); |
300 |
|
} |
301 |
|
|
302 |
|
/** |
310 |
|
* @throws NullPointerException if the specified collection or any |
311 |
|
* of its elements are null |
312 |
|
*/ |
304 |
– |
@Override |
313 |
|
public boolean addAll(Collection<? extends E> c) { |
314 |
+ |
final int s = size, needed = c.size() - (elements.length - s); |
315 |
+ |
if (needed > 0) |
316 |
+ |
grow(needed); |
317 |
+ |
c.forEach((e) -> addLast(e)); |
318 |
|
// checkInvariants(); |
319 |
< |
Object[] a, elements; |
308 |
< |
int len, capacity, s = size; |
309 |
< |
if ((len = (a = c.toArray()).length) == 0) |
310 |
< |
return false; |
311 |
< |
while ((capacity = (elements = this.elements).length) - s < len) |
312 |
< |
grow(len - (capacity - s)); |
313 |
< |
int i = add(head, s, capacity); |
314 |
< |
for (Object x : a) { |
315 |
< |
Objects.requireNonNull(x); |
316 |
< |
elements[i] = x; |
317 |
< |
i = inc(i, capacity); |
318 |
< |
size++; |
319 |
< |
} |
320 |
< |
return true; |
319 |
> |
return size > s; |
320 |
|
} |
321 |
|
|
322 |
|
/** |
348 |
|
*/ |
349 |
|
public E removeFirst() { |
350 |
|
// checkInvariants(); |
351 |
< |
E x = pollFirst(); |
352 |
< |
if (x == null) |
351 |
> |
E e = pollFirst(); |
352 |
> |
if (e == null) |
353 |
|
throw new NoSuchElementException(); |
354 |
< |
return x; |
354 |
> |
return e; |
355 |
|
} |
356 |
|
|
357 |
|
/** |
359 |
|
*/ |
360 |
|
public E removeLast() { |
361 |
|
// checkInvariants(); |
362 |
< |
E x = pollLast(); |
363 |
< |
if (x == null) |
362 |
> |
E e = pollLast(); |
363 |
> |
if (e == null) |
364 |
|
throw new NoSuchElementException(); |
365 |
< |
return x; |
365 |
> |
return e; |
366 |
|
} |
367 |
|
|
368 |
|
public E pollFirst() { |
369 |
|
// checkInvariants(); |
370 |
< |
final int s, h; |
370 |
> |
int s, h; |
371 |
|
if ((s = size) == 0) |
372 |
|
return null; |
373 |
|
final Object[] elements = this.elements; |
374 |
|
@SuppressWarnings("unchecked") E e = (E) elements[h = head]; |
375 |
|
elements[h] = null; |
376 |
< |
head = inc(h, elements.length); |
376 |
> |
if (++h >= elements.length) h = 0; |
377 |
> |
head = h; |
378 |
|
size = s - 1; |
379 |
|
return e; |
380 |
|
} |
433 |
|
* @return {@code true} if the deque contained the specified element |
434 |
|
*/ |
435 |
|
public boolean removeFirstOccurrence(Object o) { |
436 |
– |
// checkInvariants(); |
436 |
|
if (o != null) { |
437 |
|
final Object[] elements = this.elements; |
438 |
|
final int capacity = elements.length; |
439 |
< |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) { |
440 |
< |
if (o.equals(elements[i])) { |
441 |
< |
delete(i); |
442 |
< |
return true; |
443 |
< |
} |
439 |
> |
int from, end, to, leftover; |
440 |
> |
leftover = (end = (from = head) + size) |
441 |
> |
- (to = (capacity - end >= 0) ? end : capacity); |
442 |
> |
for (;; from = 0, to = leftover, leftover = 0) { |
443 |
> |
for (int i = from; i < to; i++) |
444 |
> |
if (o.equals(elements[i])) { |
445 |
> |
delete(i); |
446 |
> |
return true; |
447 |
> |
} |
448 |
> |
if (leftover == 0) break; |
449 |
|
} |
450 |
|
} |
451 |
|
return false; |
467 |
|
if (o != null) { |
468 |
|
final Object[] elements = this.elements; |
469 |
|
final int capacity = elements.length; |
470 |
< |
for (int k = size, i = add(head, k - 1, capacity); |
471 |
< |
--k >= 0; i = dec(i, capacity)) { |
472 |
< |
if (o.equals(elements[i])) { |
473 |
< |
delete(i); |
474 |
< |
return true; |
475 |
< |
} |
470 |
> |
int from, to, end, leftover; |
471 |
> |
leftover = (to = ((end = (from = tail()) - size) >= -1) ? end : -1) - end; |
472 |
> |
for (;; from = capacity - 1, to = capacity - 1 - leftover, leftover = 0) { |
473 |
> |
for (int i = from; i > to; i--) |
474 |
> |
if (o.equals(elements[i])) { |
475 |
> |
delete(i); |
476 |
> |
return true; |
477 |
> |
} |
478 |
> |
if (leftover == 0) break; |
479 |
|
} |
480 |
|
} |
481 |
|
return false; |
623 |
|
System.arraycopy(elements, h, elements, h + 1, front - (i + 1)); |
624 |
|
} |
625 |
|
elements[h] = null; |
626 |
< |
head = inc(h, capacity); |
626 |
> |
if ((head = (h + 1)) >= capacity) head = 0; |
627 |
|
size--; |
628 |
|
// checkInvariants(); |
629 |
|
return false; |
696 |
|
|
697 |
|
DeqIterator() { cursor = head; } |
698 |
|
|
692 |
– |
int advance(int i, int modulus) { |
693 |
– |
return inc(i, modulus); |
694 |
– |
} |
695 |
– |
|
696 |
– |
void doRemove() { |
697 |
– |
if (delete(lastRet)) |
698 |
– |
// if left-shifted, undo advance in next() |
699 |
– |
cursor = dec(cursor, elements.length); |
700 |
– |
} |
701 |
– |
|
699 |
|
public final boolean hasNext() { |
700 |
|
return remaining > 0; |
701 |
|
} |
702 |
|
|
703 |
< |
public final E next() { |
703 |
> |
public E next() { |
704 |
|
if (remaining == 0) |
705 |
|
throw new NoSuchElementException(); |
706 |
+ |
final Object[] elements = ArrayDeque.this.elements; |
707 |
|
E e = checkedElementAt(elements, cursor); |
708 |
|
lastRet = cursor; |
709 |
< |
cursor = advance(cursor, elements.length); |
709 |
> |
if (++cursor >= elements.length) cursor = 0; |
710 |
|
remaining--; |
711 |
|
return e; |
712 |
|
} |
713 |
|
|
714 |
+ |
void postDelete(boolean leftShifted) { |
715 |
+ |
if (leftShifted) |
716 |
+ |
if (--cursor < 0) cursor = elements.length - 1; |
717 |
+ |
} |
718 |
+ |
|
719 |
|
public final void remove() { |
720 |
|
if (lastRet < 0) |
721 |
|
throw new IllegalStateException(); |
722 |
< |
doRemove(); |
722 |
> |
postDelete(delete(lastRet)); |
723 |
|
lastRet = -1; |
724 |
|
} |
725 |
|
|
726 |
< |
public final void forEachRemaining(Consumer<? super E> action) { |
727 |
< |
Objects.requireNonNull(action); |
728 |
< |
final Object[] elements = ArrayDeque.this.elements; |
729 |
< |
final int capacity = elements.length; |
730 |
< |
int k = remaining; |
731 |
< |
remaining = 0; |
732 |
< |
for (int i = cursor; --k >= 0; i = advance(i, capacity)) |
733 |
< |
action.accept(checkedElementAt(elements, i)); |
726 |
> |
public void forEachRemaining(Consumer<? super E> action) { |
727 |
> |
int k; |
728 |
> |
if ((k = remaining) > 0) { |
729 |
> |
remaining = 0; |
730 |
> |
ArrayDeque.forEachRemaining(action, elements, cursor, k); |
731 |
> |
if ((lastRet = cursor + k - 1) >= elements.length) |
732 |
> |
lastRet -= elements.length; |
733 |
> |
} |
734 |
|
} |
735 |
|
} |
736 |
|
|
737 |
|
private class DescendingIterator extends DeqIterator { |
738 |
|
DescendingIterator() { cursor = tail(); } |
739 |
|
|
740 |
< |
@Override int advance(int i, int modulus) { |
741 |
< |
return dec(i, modulus); |
740 |
> |
public final E next() { |
741 |
> |
if (remaining == 0) |
742 |
> |
throw new NoSuchElementException(); |
743 |
> |
final Object[] elements = ArrayDeque.this.elements; |
744 |
> |
E e = checkedElementAt(elements, cursor); |
745 |
> |
lastRet = cursor; |
746 |
> |
if (--cursor < 0) cursor = elements.length - 1; |
747 |
> |
remaining--; |
748 |
> |
return e; |
749 |
|
} |
750 |
|
|
751 |
< |
@Override void doRemove() { |
752 |
< |
if (!delete(lastRet)) |
753 |
< |
// if right-shifted, undo advance in next |
754 |
< |
cursor = inc(cursor, elements.length); |
751 |
> |
void postDelete(boolean leftShifted) { |
752 |
> |
if (!leftShifted) |
753 |
> |
if (++cursor >= elements.length) cursor = 0; |
754 |
> |
} |
755 |
> |
|
756 |
> |
public final void forEachRemaining(Consumer<? super E> action) { |
757 |
> |
int k; |
758 |
> |
if ((k = remaining) > 0) { |
759 |
> |
remaining = 0; |
760 |
> |
forEachRemainingDescending(action, elements, cursor, k); |
761 |
> |
if ((lastRet = cursor - (k - 1)) < 0) |
762 |
> |
lastRet += elements.length; |
763 |
> |
} |
764 |
|
} |
765 |
|
} |
766 |
|
|
817 |
|
} |
818 |
|
|
819 |
|
public void forEachRemaining(Consumer<? super E> action) { |
820 |
< |
Objects.requireNonNull(action); |
802 |
< |
final Object[] elements = ArrayDeque.this.elements; |
803 |
< |
final int capacity = elements.length; |
804 |
< |
int k = remaining(); |
820 |
> |
int k = remaining(); // side effect! |
821 |
|
remaining = 0; |
822 |
< |
for (int i = cursor; --k >= 0; i = inc(i, capacity)) |
807 |
< |
action.accept(checkedElementAt(elements, i)); |
822 |
> |
ArrayDeque.forEachRemaining(action, elements, cursor, k); |
823 |
|
} |
824 |
|
|
825 |
|
public boolean tryAdvance(Consumer<? super E> action) { |
827 |
|
if (remaining() == 0) |
828 |
|
return false; |
829 |
|
action.accept(checkedElementAt(elements, cursor)); |
830 |
< |
cursor = inc(cursor, elements.length); |
830 |
> |
if (++cursor >= elements.length) cursor = 0; |
831 |
|
remaining--; |
832 |
|
return true; |
833 |
|
} |
844 |
|
} |
845 |
|
} |
846 |
|
|
847 |
< |
@Override |
847 |
> |
@SuppressWarnings("unchecked") |
848 |
|
public void forEach(Consumer<? super E> action) { |
834 |
– |
// checkInvariants(); |
849 |
|
Objects.requireNonNull(action); |
850 |
|
final Object[] elements = this.elements; |
851 |
|
final int capacity = elements.length; |
852 |
< |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
853 |
< |
action.accept(elementAt(i)); |
852 |
> |
int from, end, to, leftover; |
853 |
> |
leftover = (end = (from = head) + size) |
854 |
> |
- (to = (capacity - end >= 0) ? end : capacity); |
855 |
> |
for (;; from = 0, to = leftover, leftover = 0) { |
856 |
> |
for (int i = from; i < to; i++) |
857 |
> |
action.accept((E) elements[i]); |
858 |
> |
if (leftover == 0) break; |
859 |
> |
} |
860 |
|
// checkInvariants(); |
861 |
|
} |
862 |
|
|
863 |
|
/** |
864 |
+ |
* A variant of forEach that also checks for concurrent |
865 |
+ |
* modification, for use in iterators. |
866 |
+ |
*/ |
867 |
+ |
static <E> void forEachRemaining( |
868 |
+ |
Consumer<? super E> action, Object[] elements, int from, int size) { |
869 |
+ |
Objects.requireNonNull(action); |
870 |
+ |
final int capacity = elements.length; |
871 |
+ |
int end, to, leftover; |
872 |
+ |
leftover = (end = from + size) |
873 |
+ |
- (to = (capacity - end >= 0) ? end : capacity); |
874 |
+ |
for (;; from = 0, to = leftover, leftover = 0) { |
875 |
+ |
for (int i = from; i < to; i++) { |
876 |
+ |
@SuppressWarnings("unchecked") E e = (E) elements[i]; |
877 |
+ |
if (e == null) |
878 |
+ |
throw new ConcurrentModificationException(); |
879 |
+ |
action.accept(e); |
880 |
+ |
} |
881 |
+ |
if (leftover == 0) break; |
882 |
+ |
} |
883 |
+ |
} |
884 |
+ |
|
885 |
+ |
static <E> void forEachRemainingDescending( |
886 |
+ |
Consumer<? super E> action, Object[] elements, int from, int size) { |
887 |
+ |
Objects.requireNonNull(action); |
888 |
+ |
final int capacity = elements.length; |
889 |
+ |
int end, to, leftover; |
890 |
+ |
leftover = (to = ((end = from - size) >= -1) ? end : -1) - end; |
891 |
+ |
for (;; from = capacity - 1, to = capacity - 1 - leftover, leftover = 0) { |
892 |
+ |
for (int i = from; i > to; i--) { |
893 |
+ |
@SuppressWarnings("unchecked") E e = (E) elements[i]; |
894 |
+ |
if (e == null) |
895 |
+ |
throw new ConcurrentModificationException(); |
896 |
+ |
action.accept(e); |
897 |
+ |
} |
898 |
+ |
if (leftover == 0) break; |
899 |
+ |
} |
900 |
+ |
} |
901 |
+ |
|
902 |
+ |
/** |
903 |
|
* Replaces each element of this deque with the result of applying the |
904 |
|
* operator to that element, as specified by {@link List#replaceAll}. |
905 |
|
* |
906 |
|
* @param operator the operator to apply to each element |
907 |
< |
* @since 9 |
907 |
> |
* @since TBD |
908 |
|
*/ |
909 |
< |
public void replaceAll(UnaryOperator<E> operator) { |
909 |
> |
/* public */ void replaceAll(UnaryOperator<E> operator) { |
910 |
|
Objects.requireNonNull(operator); |
911 |
|
final Object[] elements = this.elements; |
912 |
|
final int capacity = elements.length; |
913 |
< |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
914 |
< |
elements[i] = operator.apply(elementAt(i)); |
913 |
> |
int from, end, to, leftover; |
914 |
> |
leftover = (end = (from = head) + size) |
915 |
> |
- (to = (capacity - end >= 0) ? end : capacity); |
916 |
> |
for (;; from = 0, to = leftover, leftover = 0) { |
917 |
> |
for (int i = from; i < to; i++) |
918 |
> |
elements[i] = operator.apply(elementAt(i)); |
919 |
> |
if (leftover == 0) break; |
920 |
> |
} |
921 |
|
// checkInvariants(); |
922 |
|
} |
923 |
|
|
924 |
|
/** |
925 |
|
* @throws NullPointerException {@inheritDoc} |
926 |
|
*/ |
862 |
– |
@Override |
927 |
|
public boolean removeIf(Predicate<? super E> filter) { |
928 |
|
Objects.requireNonNull(filter); |
929 |
|
return bulkRemove(filter); |
932 |
|
/** |
933 |
|
* @throws NullPointerException {@inheritDoc} |
934 |
|
*/ |
871 |
– |
@Override |
935 |
|
public boolean removeAll(Collection<?> c) { |
936 |
|
Objects.requireNonNull(c); |
937 |
|
return bulkRemove(e -> c.contains(e)); |
940 |
|
/** |
941 |
|
* @throws NullPointerException {@inheritDoc} |
942 |
|
*/ |
880 |
– |
@Override |
943 |
|
public boolean retainAll(Collection<?> c) { |
944 |
|
Objects.requireNonNull(c); |
945 |
|
return bulkRemove(e -> !c.contains(e)); |
952 |
|
final int capacity = elements.length; |
953 |
|
int i = head, j = i, remaining = size, deleted = 0; |
954 |
|
try { |
955 |
< |
for (; remaining > 0; remaining--, i = inc(i, capacity)) { |
955 |
> |
for (; remaining > 0; remaining--) { |
956 |
|
@SuppressWarnings("unchecked") E e = (E) elements[i]; |
957 |
|
if (filter.test(e)) |
958 |
|
deleted++; |
959 |
|
else { |
960 |
|
if (j != i) |
961 |
|
elements[j] = e; |
962 |
< |
j = inc(j, capacity); |
962 |
> |
if (++j >= capacity) j = 0; |
963 |
|
} |
964 |
+ |
if (++i >= capacity) i = 0; |
965 |
|
} |
966 |
|
return deleted > 0; |
967 |
|
} catch (Throwable ex) { |
968 |
< |
for (; remaining > 0; |
969 |
< |
remaining--, i = inc(i, capacity), j = inc(j, capacity)) |
970 |
< |
elements[j] = elements[i]; |
968 |
> |
if (deleted > 0) |
969 |
> |
for (; remaining > 0; remaining--) { |
970 |
> |
elements[j] = elements[i]; |
971 |
> |
if (++i >= capacity) i = 0; |
972 |
> |
if (++j >= capacity) j = 0; |
973 |
> |
} |
974 |
|
throw ex; |
975 |
|
} finally { |
976 |
|
size -= deleted; |
977 |
< |
for (; --deleted >= 0; j = inc(j, capacity)) |
912 |
< |
elements[j] = null; |
977 |
> |
clearSlice(elements, j, deleted); |
978 |
|
// checkInvariants(); |
979 |
|
} |
980 |
|
} |
991 |
|
if (o != null) { |
992 |
|
final Object[] elements = this.elements; |
993 |
|
final int capacity = elements.length; |
994 |
< |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
995 |
< |
if (o.equals(elements[i])) |
996 |
< |
return true; |
994 |
> |
int from, end, to, leftover; |
995 |
> |
leftover = (end = (from = head) + size) |
996 |
> |
- (to = (capacity - end >= 0) ? end : capacity); |
997 |
> |
for (;; from = 0, to = leftover, leftover = 0) { |
998 |
> |
for (int i = from; i < to; i++) |
999 |
> |
if (o.equals(elements[i])) |
1000 |
> |
return true; |
1001 |
> |
if (leftover == 0) break; |
1002 |
> |
} |
1003 |
|
} |
1004 |
|
return false; |
1005 |
|
} |
1026 |
|
* The deque will be empty after this call returns. |
1027 |
|
*/ |
1028 |
|
public void clear() { |
1029 |
< |
final Object[] elements = this.elements; |
959 |
< |
final int capacity = elements.length; |
960 |
< |
final int h = this.head; |
961 |
< |
final int s = size; |
962 |
< |
if (capacity - h >= s) |
963 |
< |
Arrays.fill(elements, h, h + s, null); |
964 |
< |
else { |
965 |
< |
Arrays.fill(elements, h, capacity, null); |
966 |
< |
Arrays.fill(elements, 0, s - capacity + h, null); |
967 |
< |
} |
1029 |
> |
clearSlice(elements, head, size); |
1030 |
|
size = head = 0; |
1031 |
|
// checkInvariants(); |
1032 |
|
} |
1033 |
|
|
1034 |
|
/** |
1035 |
+ |
* Nulls out size elements, starting at head. |
1036 |
+ |
*/ |
1037 |
+ |
private static void clearSlice(Object[] elements, int head, int size) { |
1038 |
+ |
final int capacity = elements.length, end = head + size; |
1039 |
+ |
final int leg = (capacity - end >= 0) ? end : capacity; |
1040 |
+ |
Arrays.fill(elements, head, leg, null); |
1041 |
+ |
if (leg != end) |
1042 |
+ |
Arrays.fill(elements, 0, end - capacity, null); |
1043 |
+ |
} |
1044 |
+ |
|
1045 |
+ |
/** |
1046 |
|
* Returns an array containing all of the elements in this deque |
1047 |
|
* in proper sequence (from first to last element). |
1048 |
|
* |
1056 |
|
* @return an array containing all of the elements in this deque |
1057 |
|
*/ |
1058 |
|
public Object[] toArray() { |
1059 |
< |
final int head = this.head; |
1060 |
< |
final int firstLeg; |
1061 |
< |
Object[] a = Arrays.copyOfRange(elements, head, head + size); |
1062 |
< |
if ((firstLeg = elements.length - head) < size) |
1063 |
< |
System.arraycopy(elements, 0, a, firstLeg, size - firstLeg); |
1059 |
> |
return toArray(Object[].class); |
1060 |
> |
} |
1061 |
> |
|
1062 |
> |
private <T> T[] toArray(Class<T[]> klazz) { |
1063 |
> |
final Object[] elements = this.elements; |
1064 |
> |
final int capacity = elements.length; |
1065 |
> |
final int head = this.head, end = head + size; |
1066 |
> |
final T[] a; |
1067 |
> |
if (end >= 0) { |
1068 |
> |
a = Arrays.copyOfRange(elements, head, end, klazz); |
1069 |
> |
} else { |
1070 |
> |
// integer overflow! |
1071 |
> |
a = Arrays.copyOfRange(elements, 0, size, klazz); |
1072 |
> |
System.arraycopy(elements, head, a, 0, capacity - head); |
1073 |
> |
} |
1074 |
> |
if (end - capacity > 0) |
1075 |
> |
System.arraycopy(elements, 0, a, capacity - head, end - capacity); |
1076 |
|
return a; |
1077 |
|
} |
1078 |
|
|
1114 |
|
*/ |
1115 |
|
@SuppressWarnings("unchecked") |
1116 |
|
public <T> T[] toArray(T[] a) { |
1117 |
+ |
final int size = this.size; |
1118 |
+ |
if (size > a.length) |
1119 |
+ |
return toArray((Class<T[]>) a.getClass()); |
1120 |
|
final Object[] elements = this.elements; |
1121 |
< |
final int head = this.head; |
1122 |
< |
final int firstLeg; |
1123 |
< |
boolean wrap = (firstLeg = elements.length - head) < size; |
1124 |
< |
if (size > a.length) { |
1125 |
< |
a = (T[]) Arrays.copyOfRange(elements, head, head + size, |
1126 |
< |
a.getClass()); |
1127 |
< |
} else { |
1128 |
< |
System.arraycopy(elements, head, a, 0, wrap ? firstLeg : size); |
1041 |
< |
if (size < a.length) |
1042 |
< |
a[size] = null; |
1043 |
< |
} |
1044 |
< |
if (wrap) |
1045 |
< |
System.arraycopy(elements, 0, a, firstLeg, size - firstLeg); |
1121 |
> |
final int capacity = elements.length; |
1122 |
> |
final int head = this.head, end = head + size; |
1123 |
> |
final int front = (capacity - end >= 0) ? size : capacity - head; |
1124 |
> |
System.arraycopy(elements, head, a, 0, front); |
1125 |
> |
if (front != size) |
1126 |
> |
System.arraycopy(elements, 0, a, capacity - head, end - capacity); |
1127 |
> |
if (size < a.length) |
1128 |
> |
a[size] = null; |
1129 |
|
return a; |
1130 |
|
} |
1131 |
|
|
1168 |
|
// Write out elements in order. |
1169 |
|
final Object[] elements = this.elements; |
1170 |
|
final int capacity = elements.length; |
1171 |
< |
for (int k = size, i = head; --k >= 0; i = inc(i, capacity)) |
1172 |
< |
s.writeObject(elements[i]); |
1171 |
> |
int from, end, to, leftover; |
1172 |
> |
leftover = (end = (from = head) + size) |
1173 |
> |
- (to = (capacity - end >= 0) ? end : capacity); |
1174 |
> |
for (;; from = 0, to = leftover, leftover = 0) { |
1175 |
> |
for (int i = from; i < to; i++) |
1176 |
> |
s.writeObject(elements[i]); |
1177 |
> |
if (leftover == 0) break; |
1178 |
> |
} |
1179 |
|
} |
1180 |
|
|
1181 |
|
/** |
1198 |
|
} |
1199 |
|
|
1200 |
|
/** debugging */ |
1201 |
< |
private void checkInvariants() { |
1201 |
> |
void checkInvariants() { |
1202 |
|
try { |
1203 |
|
int capacity = elements.length; |
1204 |
< |
assert size >= 0 && size <= capacity; |
1205 |
< |
assert head >= 0 && ((capacity == 0 && head == 0 && size == 0) |
1206 |
< |
|| head < capacity); |
1207 |
< |
assert size == 0 |
1208 |
< |
|| (elements[head] != null && elements[tail()] != null); |
1209 |
< |
assert size == capacity |
1210 |
< |
|| (elements[dec(head, capacity)] == null |
1122 |
< |
&& elements[inc(tail(), capacity)] == null); |
1204 |
> |
// assert size >= 0 && size <= capacity; |
1205 |
> |
// assert head >= 0; |
1206 |
> |
// assert capacity == 0 || head < capacity; |
1207 |
> |
// assert size == 0 || elements[head] != null; |
1208 |
> |
// assert size == 0 || elements[tail()] != null; |
1209 |
> |
// assert size == capacity || elements[dec(head, capacity)] == null; |
1210 |
> |
// assert size == capacity || elements[inc(tail(), capacity)] == null; |
1211 |
|
} catch (Throwable t) { |
1212 |
|
System.err.printf("head=%d size=%d capacity=%d%n", |
1213 |
|
head, size, elements.length); |