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/* |
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< |
* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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> |
* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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package java.util; |
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|
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import java.util.function.Consumer; |
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< |
import jdk.internal.misc.SharedSecrets; |
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> |
import java.util.function.Predicate; |
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> |
// OPENJDK import jdk.internal.access.SharedSecrets; |
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> |
import jdk.internal.util.ArraysSupport; |
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|
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/** |
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* An unbounded priority {@linkplain Queue queue} based on a priority heap. |
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* ({@code peek}, {@code element}, and {@code size}). |
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* |
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* <p>This class is a member of the |
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< |
* <a href="{@docRoot}/java/util/package-summary.html#CollectionsFramework"> |
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> |
* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework"> |
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* Java Collections Framework</a>. |
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* |
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* @since 1.5 |
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* @author Josh Bloch, Doug Lea |
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* @param <E> the type of elements held in this queue |
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*/ |
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+ |
@SuppressWarnings("unchecked") |
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public class PriorityQueue<E> extends AbstractQueue<E> |
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implements java.io.Serializable { |
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|
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+ |
// OPENJDK @java.io.Serial |
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private static final long serialVersionUID = -7720805057305804111L; |
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|
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private static final int DEFAULT_INITIAL_CAPACITY = 11; |
| 111 |
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* The comparator, or null if priority queue uses elements' |
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* natural ordering. |
| 113 |
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*/ |
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+ |
@SuppressWarnings("serial") // Conditionally serializable |
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private final Comparator<? super E> comparator; |
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|
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/** |
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* @throws NullPointerException if the specified collection or any |
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* of its elements are null |
| 194 |
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*/ |
| 190 |
– |
@SuppressWarnings("unchecked") |
| 195 |
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public PriorityQueue(Collection<? extends E> c) { |
| 196 |
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if (c instanceof SortedSet<?>) { |
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SortedSet<? extends E> ss = (SortedSet<? extends E>) c; |
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* @throws NullPointerException if the specified priority queue or any |
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* of its elements are null |
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*/ |
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– |
@SuppressWarnings("unchecked") |
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public PriorityQueue(PriorityQueue<? extends E> c) { |
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this.comparator = (Comparator<? super E>) c.comparator(); |
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initFromPriorityQueue(c); |
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* @throws NullPointerException if the specified sorted set or any |
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* of its elements are null |
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*/ |
| 241 |
– |
@SuppressWarnings("unchecked") |
| 244 |
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public PriorityQueue(SortedSet<? extends E> c) { |
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this.comparator = (Comparator<? super E>) c.comparator(); |
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initElementsFromCollection(c); |
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} |
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|
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+ |
/** Ensures that queue[0] exists, helping peek() and poll(). */ |
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+ |
private static Object[] ensureNonEmpty(Object[] es) { |
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+ |
return (es.length > 0) ? es : new Object[1]; |
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+ |
} |
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+ |
|
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private void initFromPriorityQueue(PriorityQueue<? extends E> c) { |
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if (c.getClass() == PriorityQueue.class) { |
| 256 |
< |
this.queue = c.toArray(); |
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> |
this.queue = ensureNonEmpty(c.toArray()); |
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this.size = c.size(); |
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} else { |
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initFromCollection(c); |
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} |
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|
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private void initElementsFromCollection(Collection<? extends E> c) { |
| 264 |
< |
Object[] a = c.toArray(); |
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< |
// If c.toArray incorrectly doesn't return Object[], copy it. |
| 266 |
< |
if (a.getClass() != Object[].class) |
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< |
a = Arrays.copyOf(a, a.length, Object[].class); |
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< |
int len = a.length; |
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> |
Object[] es = c.toArray(); |
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> |
int len = es.length; |
| 266 |
> |
if (c.getClass() != ArrayList.class) |
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> |
es = Arrays.copyOf(es, len, Object[].class); |
| 268 |
|
if (len == 1 || this.comparator != null) |
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< |
for (Object e : a) |
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> |
for (Object e : es) |
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if (e == null) |
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throw new NullPointerException(); |
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< |
this.queue = a; |
| 273 |
< |
this.size = a.length; |
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> |
this.queue = ensureNonEmpty(es); |
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> |
this.size = len; |
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} |
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|
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/** |
| 284 |
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} |
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|
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/** |
| 281 |
– |
* The maximum size of array to allocate. |
| 282 |
– |
* Some VMs reserve some header words in an array. |
| 283 |
– |
* Attempts to allocate larger arrays may result in |
| 284 |
– |
* OutOfMemoryError: Requested array size exceeds VM limit |
| 285 |
– |
*/ |
| 286 |
– |
private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
| 287 |
– |
|
| 288 |
– |
/** |
| 287 |
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* Increases the capacity of the array. |
| 288 |
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* |
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* @param minCapacity the desired minimum capacity |
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private void grow(int minCapacity) { |
| 292 |
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int oldCapacity = queue.length; |
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// Double size if small; else grow by 50% |
| 294 |
< |
int newCapacity = oldCapacity + ((oldCapacity < 64) ? |
| 295 |
< |
(oldCapacity + 2) : |
| 296 |
< |
(oldCapacity >> 1)); |
| 297 |
< |
// overflow-conscious code |
| 300 |
< |
if (newCapacity - MAX_ARRAY_SIZE > 0) |
| 301 |
< |
newCapacity = hugeCapacity(minCapacity); |
| 294 |
> |
int newCapacity = ArraysSupport.newLength(oldCapacity, |
| 295 |
> |
minCapacity - oldCapacity, /* minimum growth */ |
| 296 |
> |
oldCapacity < 64 ? oldCapacity + 2 : oldCapacity >> 1 |
| 297 |
> |
/* preferred growth */); |
| 298 |
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queue = Arrays.copyOf(queue, newCapacity); |
| 299 |
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} |
| 300 |
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|
| 305 |
– |
private static int hugeCapacity(int minCapacity) { |
| 306 |
– |
if (minCapacity < 0) // overflow |
| 307 |
– |
throw new OutOfMemoryError(); |
| 308 |
– |
return (minCapacity > MAX_ARRAY_SIZE) ? |
| 309 |
– |
Integer.MAX_VALUE : |
| 310 |
– |
MAX_ARRAY_SIZE; |
| 311 |
– |
} |
| 312 |
– |
|
| 301 |
|
/** |
| 302 |
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* Inserts the specified element into this priority queue. |
| 303 |
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* |
| 332 |
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return true; |
| 333 |
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} |
| 334 |
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|
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– |
@SuppressWarnings("unchecked") |
| 335 |
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public E peek() { |
| 336 |
< |
return (size == 0) ? null : (E) queue[0]; |
| 336 |
> |
return (E) queue[0]; |
| 337 |
|
} |
| 338 |
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|
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private int indexOf(Object o) { |
| 447 |
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* this queue |
| 448 |
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* @throws NullPointerException if the specified array is null |
| 449 |
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*/ |
| 463 |
– |
@SuppressWarnings("unchecked") |
| 450 |
|
public <T> T[] toArray(T[] a) { |
| 451 |
|
final int size = this.size; |
| 452 |
|
if (a.length < size) |
| 515 |
|
(forgetMeNot != null && !forgetMeNot.isEmpty()); |
| 516 |
|
} |
| 517 |
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|
| 532 |
– |
@SuppressWarnings("unchecked") |
| 518 |
|
public E next() { |
| 519 |
|
if (expectedModCount != modCount) |
| 520 |
|
throw new ConcurrentModificationException(); |
| 568 |
|
size = 0; |
| 569 |
|
} |
| 570 |
|
|
| 586 |
– |
@SuppressWarnings("unchecked") |
| 571 |
|
public E poll() { |
| 572 |
< |
if (size == 0) |
| 573 |
< |
return null; |
| 574 |
< |
int s = --size; |
| 575 |
< |
modCount++; |
| 576 |
< |
E result = (E) queue[0]; |
| 577 |
< |
E x = (E) queue[s]; |
| 578 |
< |
queue[s] = null; |
| 579 |
< |
if (s != 0) |
| 580 |
< |
siftDown(0, x); |
| 572 |
> |
final Object[] es; |
| 573 |
> |
final E result; |
| 574 |
> |
|
| 575 |
> |
if ((result = (E) ((es = queue)[0])) != null) { |
| 576 |
> |
modCount++; |
| 577 |
> |
final int n; |
| 578 |
> |
final E x = (E) es[(n = --size)]; |
| 579 |
> |
es[n] = null; |
| 580 |
> |
if (n > 0) { |
| 581 |
> |
final Comparator<? super E> cmp; |
| 582 |
> |
if ((cmp = comparator) == null) |
| 583 |
> |
siftDownComparable(0, x, es, n); |
| 584 |
> |
else |
| 585 |
> |
siftDownUsingComparator(0, x, es, n, cmp); |
| 586 |
> |
} |
| 587 |
> |
} |
| 588 |
|
return result; |
| 589 |
|
} |
| 590 |
|
|
| 600 |
|
* position before i. This fact is used by iterator.remove so as to |
| 601 |
|
* avoid missing traversing elements. |
| 602 |
|
*/ |
| 612 |
– |
@SuppressWarnings("unchecked") |
| 603 |
|
E removeAt(int i) { |
| 604 |
|
// assert i >= 0 && i < size; |
| 605 |
+ |
final Object[] es = queue; |
| 606 |
|
modCount++; |
| 607 |
|
int s = --size; |
| 608 |
|
if (s == i) // removed last element |
| 609 |
< |
queue[i] = null; |
| 609 |
> |
es[i] = null; |
| 610 |
|
else { |
| 611 |
< |
E moved = (E) queue[s]; |
| 612 |
< |
queue[s] = null; |
| 611 |
> |
E moved = (E) es[s]; |
| 612 |
> |
es[s] = null; |
| 613 |
|
siftDown(i, moved); |
| 614 |
< |
if (queue[i] == moved) { |
| 614 |
> |
if (es[i] == moved) { |
| 615 |
|
siftUp(i, moved); |
| 616 |
< |
if (queue[i] != moved) |
| 616 |
> |
if (es[i] != moved) |
| 617 |
|
return moved; |
| 618 |
|
} |
| 619 |
|
} |
| 634 |
|
*/ |
| 635 |
|
private void siftUp(int k, E x) { |
| 636 |
|
if (comparator != null) |
| 637 |
< |
siftUpUsingComparator(k, x); |
| 637 |
> |
siftUpUsingComparator(k, x, queue, comparator); |
| 638 |
|
else |
| 639 |
< |
siftUpComparable(k, x); |
| 639 |
> |
siftUpComparable(k, x, queue); |
| 640 |
|
} |
| 641 |
|
|
| 642 |
< |
@SuppressWarnings("unchecked") |
| 643 |
< |
private void siftUpComparable(int k, E x) { |
| 653 |
< |
Comparable<? super E> key = (Comparable<? super E>) x; |
| 642 |
> |
private static <T> void siftUpComparable(int k, T x, Object[] es) { |
| 643 |
> |
Comparable<? super T> key = (Comparable<? super T>) x; |
| 644 |
|
while (k > 0) { |
| 645 |
|
int parent = (k - 1) >>> 1; |
| 646 |
< |
Object e = queue[parent]; |
| 647 |
< |
if (key.compareTo((E) e) >= 0) |
| 646 |
> |
Object e = es[parent]; |
| 647 |
> |
if (key.compareTo((T) e) >= 0) |
| 648 |
|
break; |
| 649 |
< |
queue[k] = e; |
| 649 |
> |
es[k] = e; |
| 650 |
|
k = parent; |
| 651 |
|
} |
| 652 |
< |
queue[k] = key; |
| 652 |
> |
es[k] = key; |
| 653 |
|
} |
| 654 |
|
|
| 655 |
< |
@SuppressWarnings("unchecked") |
| 656 |
< |
private void siftUpUsingComparator(int k, E x) { |
| 655 |
> |
private static <T> void siftUpUsingComparator( |
| 656 |
> |
int k, T x, Object[] es, Comparator<? super T> cmp) { |
| 657 |
|
while (k > 0) { |
| 658 |
|
int parent = (k - 1) >>> 1; |
| 659 |
< |
Object e = queue[parent]; |
| 660 |
< |
if (comparator.compare(x, (E) e) >= 0) |
| 659 |
> |
Object e = es[parent]; |
| 660 |
> |
if (cmp.compare(x, (T) e) >= 0) |
| 661 |
|
break; |
| 662 |
< |
queue[k] = e; |
| 662 |
> |
es[k] = e; |
| 663 |
|
k = parent; |
| 664 |
|
} |
| 665 |
< |
queue[k] = x; |
| 665 |
> |
es[k] = x; |
| 666 |
|
} |
| 667 |
|
|
| 668 |
|
/** |
| 675 |
|
*/ |
| 676 |
|
private void siftDown(int k, E x) { |
| 677 |
|
if (comparator != null) |
| 678 |
< |
siftDownUsingComparator(k, x); |
| 678 |
> |
siftDownUsingComparator(k, x, queue, size, comparator); |
| 679 |
|
else |
| 680 |
< |
siftDownComparable(k, x); |
| 680 |
> |
siftDownComparable(k, x, queue, size); |
| 681 |
|
} |
| 682 |
|
|
| 683 |
< |
@SuppressWarnings("unchecked") |
| 684 |
< |
private void siftDownComparable(int k, E x) { |
| 685 |
< |
Comparable<? super E> key = (Comparable<? super E>)x; |
| 686 |
< |
int half = size >>> 1; // loop while a non-leaf |
| 683 |
> |
private static <T> void siftDownComparable(int k, T x, Object[] es, int n) { |
| 684 |
> |
// assert n > 0; |
| 685 |
> |
Comparable<? super T> key = (Comparable<? super T>)x; |
| 686 |
> |
int half = n >>> 1; // loop while a non-leaf |
| 687 |
|
while (k < half) { |
| 688 |
|
int child = (k << 1) + 1; // assume left child is least |
| 689 |
< |
Object c = queue[child]; |
| 689 |
> |
Object c = es[child]; |
| 690 |
|
int right = child + 1; |
| 691 |
< |
if (right < size && |
| 692 |
< |
((Comparable<? super E>) c).compareTo((E) queue[right]) > 0) |
| 693 |
< |
c = queue[child = right]; |
| 694 |
< |
if (key.compareTo((E) c) <= 0) |
| 691 |
> |
if (right < n && |
| 692 |
> |
((Comparable<? super T>) c).compareTo((T) es[right]) > 0) |
| 693 |
> |
c = es[child = right]; |
| 694 |
> |
if (key.compareTo((T) c) <= 0) |
| 695 |
|
break; |
| 696 |
< |
queue[k] = c; |
| 696 |
> |
es[k] = c; |
| 697 |
|
k = child; |
| 698 |
|
} |
| 699 |
< |
queue[k] = key; |
| 699 |
> |
es[k] = key; |
| 700 |
|
} |
| 701 |
|
|
| 702 |
< |
@SuppressWarnings("unchecked") |
| 703 |
< |
private void siftDownUsingComparator(int k, E x) { |
| 704 |
< |
int half = size >>> 1; |
| 702 |
> |
private static <T> void siftDownUsingComparator( |
| 703 |
> |
int k, T x, Object[] es, int n, Comparator<? super T> cmp) { |
| 704 |
> |
// assert n > 0; |
| 705 |
> |
int half = n >>> 1; |
| 706 |
|
while (k < half) { |
| 707 |
|
int child = (k << 1) + 1; |
| 708 |
< |
Object c = queue[child]; |
| 708 |
> |
Object c = es[child]; |
| 709 |
|
int right = child + 1; |
| 710 |
< |
if (right < size && |
| 711 |
< |
comparator.compare((E) c, (E) queue[right]) > 0) |
| 712 |
< |
c = queue[child = right]; |
| 722 |
< |
if (comparator.compare(x, (E) c) <= 0) |
| 710 |
> |
if (right < n && cmp.compare((T) c, (T) es[right]) > 0) |
| 711 |
> |
c = es[child = right]; |
| 712 |
> |
if (cmp.compare(x, (T) c) <= 0) |
| 713 |
|
break; |
| 714 |
< |
queue[k] = c; |
| 714 |
> |
es[k] = c; |
| 715 |
|
k = child; |
| 716 |
|
} |
| 717 |
< |
queue[k] = x; |
| 717 |
> |
es[k] = x; |
| 718 |
|
} |
| 719 |
|
|
| 720 |
|
/** |
| 722 |
|
* assuming nothing about the order of the elements prior to the call. |
| 723 |
|
* This classic algorithm due to Floyd (1964) is known to be O(size). |
| 724 |
|
*/ |
| 735 |
– |
@SuppressWarnings("unchecked") |
| 725 |
|
private void heapify() { |
| 726 |
|
final Object[] es = queue; |
| 727 |
< |
int i = (size >>> 1) - 1; |
| 728 |
< |
if (comparator == null) |
| 727 |
> |
int n = size, i = (n >>> 1) - 1; |
| 728 |
> |
final Comparator<? super E> cmp; |
| 729 |
> |
if ((cmp = comparator) == null) |
| 730 |
|
for (; i >= 0; i--) |
| 731 |
< |
siftDownComparable(i, (E) es[i]); |
| 731 |
> |
siftDownComparable(i, (E) es[i], es, n); |
| 732 |
|
else |
| 733 |
|
for (; i >= 0; i--) |
| 734 |
< |
siftDownUsingComparator(i, (E) es[i]); |
| 734 |
> |
siftDownUsingComparator(i, (E) es[i], es, n, cmp); |
| 735 |
|
} |
| 736 |
|
|
| 737 |
|
/** |
| 756 |
|
* emitted (int), followed by all of its elements |
| 757 |
|
* (each an {@code Object}) in the proper order. |
| 758 |
|
*/ |
| 759 |
+ |
// OPENJDK @java.io.Serial |
| 760 |
|
private void writeObject(java.io.ObjectOutputStream s) |
| 761 |
|
throws java.io.IOException { |
| 762 |
|
// Write out element count, and any hidden stuff |
| 780 |
|
* could not be found |
| 781 |
|
* @throws java.io.IOException if an I/O error occurs |
| 782 |
|
*/ |
| 783 |
+ |
// OPENJDK @java.io.Serial |
| 784 |
|
private void readObject(java.io.ObjectInputStream s) |
| 785 |
|
throws java.io.IOException, ClassNotFoundException { |
| 786 |
|
// Read in size, and any hidden stuff |
| 789 |
|
// Read in (and discard) array length |
| 790 |
|
s.readInt(); |
| 791 |
|
|
| 792 |
< |
SharedSecrets.getJavaObjectInputStreamAccess().checkArray(s, Object[].class, size); |
| 793 |
< |
queue = new Object[size]; |
| 792 |
> |
jsr166.Platform.checkArray(s, Object[].class, size); |
| 793 |
> |
final Object[] es = queue = new Object[Math.max(size, 1)]; |
| 794 |
|
|
| 795 |
|
// Read in all elements. |
| 804 |
– |
final Object[] es = queue; |
| 796 |
|
for (int i = 0, n = size; i < n; i++) |
| 797 |
|
es[i] = s.readObject(); |
| 798 |
|
|
| 846 |
|
new PriorityQueueSpliterator(lo, index = mid, expectedModCount); |
| 847 |
|
} |
| 848 |
|
|
| 858 |
– |
@SuppressWarnings("unchecked") |
| 849 |
|
public void forEachRemaining(Consumer<? super E> action) { |
| 850 |
|
if (action == null) |
| 851 |
|
throw new NullPointerException(); |
| 852 |
|
if (fence < 0) { fence = size; expectedModCount = modCount; } |
| 853 |
< |
final Object[] a = queue; |
| 853 |
> |
final Object[] es = queue; |
| 854 |
|
int i, hi; E e; |
| 855 |
|
for (i = index, index = hi = fence; i < hi; i++) { |
| 856 |
< |
if ((e = (E) a[i]) == null) |
| 856 |
> |
if ((e = (E) es[i]) == null) |
| 857 |
|
break; // must be CME |
| 858 |
|
action.accept(e); |
| 859 |
|
} |
| 861 |
|
throw new ConcurrentModificationException(); |
| 862 |
|
} |
| 863 |
|
|
| 874 |
– |
@SuppressWarnings("unchecked") |
| 864 |
|
public boolean tryAdvance(Consumer<? super E> action) { |
| 865 |
|
if (action == null) |
| 866 |
|
throw new NullPointerException(); |
| 890 |
|
/** |
| 891 |
|
* @throws NullPointerException {@inheritDoc} |
| 892 |
|
*/ |
| 893 |
< |
@SuppressWarnings("unchecked") |
| 893 |
> |
public boolean removeIf(Predicate<? super E> filter) { |
| 894 |
> |
Objects.requireNonNull(filter); |
| 895 |
> |
return bulkRemove(filter); |
| 896 |
> |
} |
| 897 |
> |
|
| 898 |
> |
/** |
| 899 |
> |
* @throws NullPointerException {@inheritDoc} |
| 900 |
> |
*/ |
| 901 |
> |
public boolean removeAll(Collection<?> c) { |
| 902 |
> |
Objects.requireNonNull(c); |
| 903 |
> |
return bulkRemove(e -> c.contains(e)); |
| 904 |
> |
} |
| 905 |
> |
|
| 906 |
> |
/** |
| 907 |
> |
* @throws NullPointerException {@inheritDoc} |
| 908 |
> |
*/ |
| 909 |
> |
public boolean retainAll(Collection<?> c) { |
| 910 |
> |
Objects.requireNonNull(c); |
| 911 |
> |
return bulkRemove(e -> !c.contains(e)); |
| 912 |
> |
} |
| 913 |
> |
|
| 914 |
> |
// A tiny bit set implementation |
| 915 |
> |
|
| 916 |
> |
private static long[] nBits(int n) { |
| 917 |
> |
return new long[((n - 1) >> 6) + 1]; |
| 918 |
> |
} |
| 919 |
> |
private static void setBit(long[] bits, int i) { |
| 920 |
> |
bits[i >> 6] |= 1L << i; |
| 921 |
> |
} |
| 922 |
> |
private static boolean isClear(long[] bits, int i) { |
| 923 |
> |
return (bits[i >> 6] & (1L << i)) == 0; |
| 924 |
> |
} |
| 925 |
> |
|
| 926 |
> |
/** Implementation of bulk remove methods. */ |
| 927 |
> |
private boolean bulkRemove(Predicate<? super E> filter) { |
| 928 |
> |
final int expectedModCount = ++modCount; |
| 929 |
> |
final Object[] es = queue; |
| 930 |
> |
final int end = size; |
| 931 |
> |
int i; |
| 932 |
> |
// Optimize for initial run of survivors |
| 933 |
> |
for (i = 0; i < end && !filter.test((E) es[i]); i++) |
| 934 |
> |
; |
| 935 |
> |
if (i >= end) { |
| 936 |
> |
if (modCount != expectedModCount) |
| 937 |
> |
throw new ConcurrentModificationException(); |
| 938 |
> |
return false; |
| 939 |
> |
} |
| 940 |
> |
// Tolerate predicates that reentrantly access the collection for |
| 941 |
> |
// read (but writers still get CME), so traverse once to find |
| 942 |
> |
// elements to delete, a second pass to physically expunge. |
| 943 |
> |
final int beg = i; |
| 944 |
> |
final long[] deathRow = nBits(end - beg); |
| 945 |
> |
deathRow[0] = 1L; // set bit 0 |
| 946 |
> |
for (i = beg + 1; i < end; i++) |
| 947 |
> |
if (filter.test((E) es[i])) |
| 948 |
> |
setBit(deathRow, i - beg); |
| 949 |
> |
if (modCount != expectedModCount) |
| 950 |
> |
throw new ConcurrentModificationException(); |
| 951 |
> |
int w = beg; |
| 952 |
> |
for (i = beg; i < end; i++) |
| 953 |
> |
if (isClear(deathRow, i - beg)) |
| 954 |
> |
es[w++] = es[i]; |
| 955 |
> |
for (i = size = w; i < end; i++) |
| 956 |
> |
es[i] = null; |
| 957 |
> |
heapify(); |
| 958 |
> |
return true; |
| 959 |
> |
} |
| 960 |
> |
|
| 961 |
> |
/** |
| 962 |
> |
* @throws NullPointerException {@inheritDoc} |
| 963 |
> |
*/ |
| 964 |
|
public void forEach(Consumer<? super E> action) { |
| 965 |
|
Objects.requireNonNull(action); |
| 966 |
|
final int expectedModCount = modCount; |
