author | darcy |
Wed, 09 Oct 2019 10:17:50 -0700 | |
changeset 58520 | e036ee8bae56 |
parent 57956 | e0b8b019d2f5 |
child 58679 | 9c3209ff7550 |
permissions | -rw-r--r-- |
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/* |
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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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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.util; |
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import java.util.function.Consumer; |
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import java.util.function.Predicate; |
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import jdk.internal.access.SharedSecrets; |
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import jdk.internal.util.ArraysSupport; |
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/** |
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* An unbounded priority {@linkplain Queue queue} based on a priority heap. |
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* The elements of the priority queue are ordered according to their |
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* {@linkplain Comparable natural ordering}, or by a {@link Comparator} |
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* provided at queue construction time, depending on which constructor is |
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* used. A priority queue does not permit {@code null} elements. |
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* A priority queue relying on natural ordering also does not permit |
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* insertion of non-comparable objects (doing so may result in |
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* {@code ClassCastException}). |
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* |
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* <p>The <em>head</em> of this queue is the <em>least</em> element |
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* with respect to the specified ordering. If multiple elements are |
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* tied for least value, the head is one of those elements -- ties are |
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* broken arbitrarily. The queue retrieval operations {@code poll}, |
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* {@code remove}, {@code peek}, and {@code element} access the |
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* element at the head of the queue. |
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* |
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* <p>A priority queue is unbounded, but has an internal |
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* <i>capacity</i> governing the size of an array used to store the |
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* elements on the queue. It is always at least as large as the queue |
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* size. As elements are added to a priority queue, its capacity |
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* grows automatically. The details of the growth policy are not |
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* specified. |
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* |
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* <p>This class and its iterator implement all of the |
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* <em>optional</em> methods of the {@link Collection} and {@link |
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* Iterator} interfaces. The Iterator provided in method {@link |
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* #iterator()} and the Spliterator provided in method {@link #spliterator()} |
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* are <em>not</em> guaranteed to traverse the elements of |
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* the priority queue in any particular order. If you need ordered |
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* traversal, consider using {@code Arrays.sort(pq.toArray())}. |
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* |
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* <p><strong>Note that this implementation is not synchronized.</strong> |
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* Multiple threads should not access a {@code PriorityQueue} |
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* instance concurrently if any of the threads modifies the queue. |
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* Instead, use the thread-safe {@link |
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* java.util.concurrent.PriorityBlockingQueue} class. |
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* |
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* <p>Implementation note: this implementation provides |
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* O(log(n)) time for the enqueuing and dequeuing methods |
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* ({@code offer}, {@code poll}, {@code remove()} and {@code add}); |
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* linear time for the {@code remove(Object)} and {@code contains(Object)} |
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* methods; and constant time for the retrieval methods |
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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.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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@java.io.Serial |
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private static final long serialVersionUID = -7720805057305804111L; |
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private static final int DEFAULT_INITIAL_CAPACITY = 11; |
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/** |
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* Priority queue represented as a balanced binary heap: the two |
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* children of queue[n] are queue[2*n+1] and queue[2*(n+1)]. The |
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* priority queue is ordered by comparator, or by the elements' |
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* natural ordering, if comparator is null: For each node n in the |
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* heap and each descendant d of n, n <= d. The element with the |
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* lowest value is in queue[0], assuming the queue is nonempty. |
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*/ |
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transient Object[] queue; // non-private to simplify nested class access |
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/** |
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* The number of elements in the priority queue. |
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*/ |
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int size; |
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/** |
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* The comparator, or null if priority queue uses elements' |
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* natural ordering. |
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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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* The number of times this priority queue has been |
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* <i>structurally modified</i>. See AbstractList for gory details. |
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*/ |
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transient int modCount; // non-private to simplify nested class access |
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/** |
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* Creates a {@code PriorityQueue} with the default initial |
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* capacity (11) that orders its elements according to their |
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* {@linkplain Comparable natural ordering}. |
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*/ |
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public PriorityQueue() { |
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this(DEFAULT_INITIAL_CAPACITY, null); |
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} |
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/** |
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* Creates a {@code PriorityQueue} with the specified initial |
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* capacity that orders its elements according to their |
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* {@linkplain Comparable natural ordering}. |
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* |
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* @param initialCapacity the initial capacity for this priority queue |
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* @throws IllegalArgumentException if {@code initialCapacity} is less |
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* than 1 |
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*/ |
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public PriorityQueue(int initialCapacity) { |
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this(initialCapacity, null); |
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} |
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/** |
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* Creates a {@code PriorityQueue} with the default initial capacity and |
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* whose elements are ordered according to the specified comparator. |
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* |
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* @param comparator the comparator that will be used to order this |
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* priority queue. If {@code null}, the {@linkplain Comparable |
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* natural ordering} of the elements will be used. |
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* @since 1.8 |
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*/ |
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public PriorityQueue(Comparator<? super E> comparator) { |
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this(DEFAULT_INITIAL_CAPACITY, comparator); |
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} |
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/** |
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* Creates a {@code PriorityQueue} with the specified initial capacity |
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* that orders its elements according to the specified comparator. |
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* |
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* @param initialCapacity the initial capacity for this priority queue |
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* @param comparator the comparator that will be used to order this |
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* priority queue. If {@code null}, the {@linkplain Comparable |
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* natural ordering} of the elements will be used. |
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* @throws IllegalArgumentException if {@code initialCapacity} is |
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* less than 1 |
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*/ |
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public PriorityQueue(int initialCapacity, |
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Comparator<? super E> comparator) { |
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// Note: This restriction of at least one is not actually needed, |
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// but continues for 1.5 compatibility |
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if (initialCapacity < 1) |
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throw new IllegalArgumentException(); |
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this.queue = new Object[initialCapacity]; |
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this.comparator = comparator; |
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} |
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/** |
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* Creates a {@code PriorityQueue} containing the elements in the |
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* specified collection. If the specified collection is an instance of |
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* a {@link SortedSet} or is another {@code PriorityQueue}, this |
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* priority queue will be ordered according to the same ordering. |
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* Otherwise, this priority queue will be ordered according to the |
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* {@linkplain Comparable natural ordering} of its elements. |
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* |
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* @param c the collection whose elements are to be placed |
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* into this priority queue |
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* @throws ClassCastException if elements of the specified collection |
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* cannot be compared to one another according to the priority |
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* queue's ordering |
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* @throws NullPointerException if the specified collection or any |
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* of its elements are null |
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*/ |
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public PriorityQueue(Collection<? extends E> c) { |
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if (c instanceof SortedSet<?>) { |
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SortedSet<? extends E> ss = (SortedSet<? extends E>) c; |
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this.comparator = (Comparator<? super E>) ss.comparator(); |
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initElementsFromCollection(ss); |
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} |
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else if (c instanceof PriorityQueue<?>) { |
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PriorityQueue<? extends E> pq = (PriorityQueue<? extends E>) c; |
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this.comparator = (Comparator<? super E>) pq.comparator(); |
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initFromPriorityQueue(pq); |
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} |
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else { |
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this.comparator = null; |
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initFromCollection(c); |
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} |
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} |
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/** |
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* Creates a {@code PriorityQueue} containing the elements in the |
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* specified priority queue. This priority queue will be |
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* ordered according to the same ordering as the given priority |
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* queue. |
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* |
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* @param c the priority queue whose elements are to be placed |
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* into this priority queue |
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* @throws ClassCastException if elements of {@code c} cannot be |
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* compared to one another according to {@code c}'s |
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* ordering |
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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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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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} |
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/** |
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* Creates a {@code PriorityQueue} containing the elements in the |
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* specified sorted set. This priority queue will be ordered |
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* according to the same ordering as the given sorted set. |
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* |
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* @param c the sorted set whose elements are to be placed |
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* into this priority queue |
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* @throws ClassCastException if elements of the specified sorted |
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* set cannot be compared to one another according to the |
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* sorted set's ordering |
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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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*/ |
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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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/** 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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private void initFromPriorityQueue(PriorityQueue<? extends E> c) { |
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if (c.getClass() == PriorityQueue.class) { |
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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) { |
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Object[] es = c.toArray(); |
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int len = es.length; |
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266 |
// If c.toArray incorrectly doesn't return Object[], copy it. |
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267 |
if (es.getClass() != Object[].class) |
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|
268 |
es = Arrays.copyOf(es, len, Object[].class); |
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|
269 |
if (len == 1 || this.comparator != null) |
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|
270 |
for (Object e : es) |
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271 |
if (e == null) |
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272 |
throw new NullPointerException(); |
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|
273 |
this.queue = ensureNonEmpty(es); |
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|
274 |
this.size = len; |
2 | 275 |
} |
276 |
||
277 |
/** |
|
278 |
* Initializes queue array with elements from the given Collection. |
|
279 |
* |
|
280 |
* @param c the collection |
|
281 |
*/ |
|
282 |
private void initFromCollection(Collection<? extends E> c) { |
|
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|
283 |
initElementsFromCollection(c); |
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|
284 |
heapify(); |
2 | 285 |
} |
286 |
||
287 |
/** |
|
288 |
* Increases the capacity of the array. |
|
289 |
* |
|
290 |
* @param minCapacity the desired minimum capacity |
|
291 |
*/ |
|
292 |
private void grow(int minCapacity) { |
|
293 |
int oldCapacity = queue.length; |
|
294 |
// Double size if small; else grow by 50% |
|
54971 | 295 |
int newCapacity = ArraysSupport.newLength(oldCapacity, |
296 |
minCapacity - oldCapacity, /* minimum growth */ |
|
297 |
oldCapacity < 64 ? oldCapacity + 2 : oldCapacity >> 1 |
|
298 |
/* preferred growth */); |
|
2 | 299 |
queue = Arrays.copyOf(queue, newCapacity); |
300 |
} |
|
301 |
||
302 |
/** |
|
303 |
* Inserts the specified element into this priority queue. |
|
304 |
* |
|
305 |
* @return {@code true} (as specified by {@link Collection#add}) |
|
306 |
* @throws ClassCastException if the specified element cannot be |
|
307 |
* compared with elements currently in this priority queue |
|
308 |
* according to the priority queue's ordering |
|
309 |
* @throws NullPointerException if the specified element is null |
|
310 |
*/ |
|
311 |
public boolean add(E e) { |
|
312 |
return offer(e); |
|
313 |
} |
|
314 |
||
315 |
/** |
|
316 |
* Inserts the specified element into this priority queue. |
|
317 |
* |
|
318 |
* @return {@code true} (as specified by {@link Queue#offer}) |
|
319 |
* @throws ClassCastException if the specified element cannot be |
|
320 |
* compared with elements currently in this priority queue |
|
321 |
* according to the priority queue's ordering |
|
322 |
* @throws NullPointerException if the specified element is null |
|
323 |
*/ |
|
324 |
public boolean offer(E e) { |
|
325 |
if (e == null) |
|
326 |
throw new NullPointerException(); |
|
327 |
modCount++; |
|
328 |
int i = size; |
|
329 |
if (i >= queue.length) |
|
330 |
grow(i + 1); |
|
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|
331 |
siftUp(i, e); |
2 | 332 |
size = i + 1; |
333 |
return true; |
|
334 |
} |
|
335 |
||
336 |
public E peek() { |
|
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|
337 |
return (E) queue[0]; |
2 | 338 |
} |
339 |
||
340 |
private int indexOf(Object o) { |
|
341 |
if (o != null) { |
|
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|
342 |
final Object[] es = queue; |
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|
343 |
for (int i = 0, n = size; i < n; i++) |
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|
344 |
if (o.equals(es[i])) |
2 | 345 |
return i; |
346 |
} |
|
347 |
return -1; |
|
348 |
} |
|
349 |
||
350 |
/** |
|
351 |
* Removes a single instance of the specified element from this queue, |
|
352 |
* if it is present. More formally, removes an element {@code e} such |
|
353 |
* that {@code o.equals(e)}, if this queue contains one or more such |
|
354 |
* elements. Returns {@code true} if and only if this queue contained |
|
355 |
* the specified element (or equivalently, if this queue changed as a |
|
356 |
* result of the call). |
|
357 |
* |
|
358 |
* @param o element to be removed from this queue, if present |
|
359 |
* @return {@code true} if this queue changed as a result of the call |
|
360 |
*/ |
|
361 |
public boolean remove(Object o) { |
|
362 |
int i = indexOf(o); |
|
363 |
if (i == -1) |
|
364 |
return false; |
|
365 |
else { |
|
366 |
removeAt(i); |
|
367 |
return true; |
|
368 |
} |
|
369 |
} |
|
370 |
||
371 |
/** |
|
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|
372 |
* Identity-based version for use in Itr.remove. |
2 | 373 |
* |
374 |
* @param o element to be removed from this queue, if present |
|
375 |
*/ |
|
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|
376 |
void removeEq(Object o) { |
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|
377 |
final Object[] es = queue; |
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|
378 |
for (int i = 0, n = size; i < n; i++) { |
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|
379 |
if (o == es[i]) { |
2 | 380 |
removeAt(i); |
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changeset
|
381 |
break; |
2 | 382 |
} |
383 |
} |
|
384 |
} |
|
385 |
||
386 |
/** |
|
387 |
* Returns {@code true} if this queue contains the specified element. |
|
388 |
* More formally, returns {@code true} if and only if this queue contains |
|
389 |
* at least one element {@code e} such that {@code o.equals(e)}. |
|
390 |
* |
|
391 |
* @param o object to be checked for containment in this queue |
|
392 |
* @return {@code true} if this queue contains the specified element |
|
393 |
*/ |
|
394 |
public boolean contains(Object o) { |
|
26451 | 395 |
return indexOf(o) >= 0; |
2 | 396 |
} |
397 |
||
398 |
/** |
|
399 |
* Returns an array containing all of the elements in this queue. |
|
400 |
* The elements are in no particular order. |
|
401 |
* |
|
402 |
* <p>The returned array will be "safe" in that no references to it are |
|
403 |
* maintained by this queue. (In other words, this method must allocate |
|
404 |
* a new array). The caller is thus free to modify the returned array. |
|
405 |
* |
|
406 |
* <p>This method acts as bridge between array-based and collection-based |
|
407 |
* APIs. |
|
408 |
* |
|
409 |
* @return an array containing all of the elements in this queue |
|
410 |
*/ |
|
411 |
public Object[] toArray() { |
|
412 |
return Arrays.copyOf(queue, size); |
|
413 |
} |
|
414 |
||
415 |
/** |
|
416 |
* Returns an array containing all of the elements in this queue; the |
|
417 |
* runtime type of the returned array is that of the specified array. |
|
418 |
* The returned array elements are in no particular order. |
|
419 |
* If the queue fits in the specified array, it is returned therein. |
|
420 |
* Otherwise, a new array is allocated with the runtime type of the |
|
421 |
* specified array and the size of this queue. |
|
422 |
* |
|
423 |
* <p>If the queue fits in the specified array with room to spare |
|
424 |
* (i.e., the array has more elements than the queue), the element in |
|
425 |
* the array immediately following the end of the collection is set to |
|
426 |
* {@code null}. |
|
427 |
* |
|
428 |
* <p>Like the {@link #toArray()} method, this method acts as bridge between |
|
429 |
* array-based and collection-based APIs. Further, this method allows |
|
430 |
* precise control over the runtime type of the output array, and may, |
|
431 |
* under certain circumstances, be used to save allocation costs. |
|
432 |
* |
|
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|
433 |
* <p>Suppose {@code x} is a queue known to contain only strings. |
2 | 434 |
* The following code can be used to dump the queue into a newly |
17168
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changeset
|
435 |
* allocated array of {@code String}: |
2 | 436 |
* |
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|
437 |
* <pre> {@code String[] y = x.toArray(new String[0]);}</pre> |
2 | 438 |
* |
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changeset
|
439 |
* Note that {@code toArray(new Object[0])} is identical in function to |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
440 |
* {@code toArray()}. |
2 | 441 |
* |
442 |
* @param a the array into which the elements of the queue are to |
|
443 |
* be stored, if it is big enough; otherwise, a new array of the |
|
444 |
* same runtime type is allocated for this purpose. |
|
445 |
* @return an array containing all of the elements in this queue |
|
446 |
* @throws ArrayStoreException if the runtime type of the specified array |
|
447 |
* is not a supertype of the runtime type of every element in |
|
448 |
* this queue |
|
449 |
* @throws NullPointerException if the specified array is null |
|
450 |
*/ |
|
451 |
public <T> T[] toArray(T[] a) { |
|
17168
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parents:
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diff
changeset
|
452 |
final int size = this.size; |
2 | 453 |
if (a.length < size) |
454 |
// Make a new array of a's runtime type, but my contents: |
|
455 |
return (T[]) Arrays.copyOf(queue, size, a.getClass()); |
|
456 |
System.arraycopy(queue, 0, a, 0, size); |
|
457 |
if (a.length > size) |
|
458 |
a[size] = null; |
|
459 |
return a; |
|
460 |
} |
|
461 |
||
462 |
/** |
|
463 |
* Returns an iterator over the elements in this queue. The iterator |
|
464 |
* does not return the elements in any particular order. |
|
465 |
* |
|
466 |
* @return an iterator over the elements in this queue |
|
467 |
*/ |
|
468 |
public Iterator<E> iterator() { |
|
469 |
return new Itr(); |
|
470 |
} |
|
471 |
||
472 |
private final class Itr implements Iterator<E> { |
|
473 |
/** |
|
474 |
* Index (into queue array) of element to be returned by |
|
475 |
* subsequent call to next. |
|
476 |
*/ |
|
32991
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parents:
26451
diff
changeset
|
477 |
private int cursor; |
2 | 478 |
|
479 |
/** |
|
480 |
* Index of element returned by most recent call to next, |
|
481 |
* unless that element came from the forgetMeNot list. |
|
482 |
* Set to -1 if element is deleted by a call to remove. |
|
483 |
*/ |
|
484 |
private int lastRet = -1; |
|
485 |
||
486 |
/** |
|
487 |
* A queue of elements that were moved from the unvisited portion of |
|
488 |
* the heap into the visited portion as a result of "unlucky" element |
|
489 |
* removals during the iteration. (Unlucky element removals are those |
|
490 |
* that require a siftup instead of a siftdown.) We must visit all of |
|
491 |
* the elements in this list to complete the iteration. We do this |
|
492 |
* after we've completed the "normal" iteration. |
|
493 |
* |
|
494 |
* We expect that most iterations, even those involving removals, |
|
495 |
* will not need to store elements in this field. |
|
496 |
*/ |
|
32991
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dl
parents:
26451
diff
changeset
|
497 |
private ArrayDeque<E> forgetMeNot; |
2 | 498 |
|
499 |
/** |
|
500 |
* Element returned by the most recent call to next iff that |
|
501 |
* element was drawn from the forgetMeNot list. |
|
502 |
*/ |
|
32991
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8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
503 |
private E lastRetElt; |
2 | 504 |
|
505 |
/** |
|
506 |
* The modCount value that the iterator believes that the backing |
|
507 |
* Queue should have. If this expectation is violated, the iterator |
|
508 |
* has detected concurrent modification. |
|
509 |
*/ |
|
510 |
private int expectedModCount = modCount; |
|
511 |
||
42927
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42226
diff
changeset
|
512 |
Itr() {} // prevent access constructor creation |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
513 |
|
2 | 514 |
public boolean hasNext() { |
515 |
return cursor < size || |
|
516 |
(forgetMeNot != null && !forgetMeNot.isEmpty()); |
|
517 |
} |
|
518 |
||
519 |
public E next() { |
|
520 |
if (expectedModCount != modCount) |
|
521 |
throw new ConcurrentModificationException(); |
|
522 |
if (cursor < size) |
|
523 |
return (E) queue[lastRet = cursor++]; |
|
524 |
if (forgetMeNot != null) { |
|
525 |
lastRet = -1; |
|
526 |
lastRetElt = forgetMeNot.poll(); |
|
527 |
if (lastRetElt != null) |
|
528 |
return lastRetElt; |
|
529 |
} |
|
530 |
throw new NoSuchElementException(); |
|
531 |
} |
|
532 |
||
533 |
public void remove() { |
|
534 |
if (expectedModCount != modCount) |
|
535 |
throw new ConcurrentModificationException(); |
|
536 |
if (lastRet != -1) { |
|
537 |
E moved = PriorityQueue.this.removeAt(lastRet); |
|
538 |
lastRet = -1; |
|
539 |
if (moved == null) |
|
540 |
cursor--; |
|
541 |
else { |
|
542 |
if (forgetMeNot == null) |
|
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
543 |
forgetMeNot = new ArrayDeque<>(); |
2 | 544 |
forgetMeNot.add(moved); |
545 |
} |
|
546 |
} else if (lastRetElt != null) { |
|
547 |
PriorityQueue.this.removeEq(lastRetElt); |
|
548 |
lastRetElt = null; |
|
549 |
} else { |
|
550 |
throw new IllegalStateException(); |
|
551 |
} |
|
552 |
expectedModCount = modCount; |
|
553 |
} |
|
554 |
} |
|
555 |
||
556 |
public int size() { |
|
557 |
return size; |
|
558 |
} |
|
559 |
||
560 |
/** |
|
561 |
* Removes all of the elements from this priority queue. |
|
562 |
* The queue will be empty after this call returns. |
|
563 |
*/ |
|
564 |
public void clear() { |
|
565 |
modCount++; |
|
50229
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changeset
|
566 |
final Object[] es = queue; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
567 |
for (int i = 0, n = size; i < n; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
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parents:
49433
diff
changeset
|
568 |
es[i] = null; |
2 | 569 |
size = 0; |
570 |
} |
|
571 |
||
572 |
public E poll() { |
|
50229
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8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
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diff
changeset
|
573 |
final Object[] es; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
574 |
final E result; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
575 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
576 |
if ((result = (E) ((es = queue)[0])) != null) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
577 |
modCount++; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
578 |
final int n; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
579 |
final E x = (E) es[(n = --size)]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
580 |
es[n] = null; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
581 |
if (n > 0) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
582 |
final Comparator<? super E> cmp; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
583 |
if ((cmp = comparator) == null) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
584 |
siftDownComparable(0, x, es, n); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
585 |
else |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
586 |
siftDownUsingComparator(0, x, es, n, cmp); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
587 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
588 |
} |
2 | 589 |
return result; |
590 |
} |
|
591 |
||
592 |
/** |
|
593 |
* Removes the ith element from queue. |
|
594 |
* |
|
595 |
* Normally this method leaves the elements at up to i-1, |
|
596 |
* inclusive, untouched. Under these circumstances, it returns |
|
597 |
* null. Occasionally, in order to maintain the heap invariant, |
|
598 |
* it must swap a later element of the list with one earlier than |
|
599 |
* i. Under these circumstances, this method returns the element |
|
600 |
* that was previously at the end of the list and is now at some |
|
601 |
* position before i. This fact is used by iterator.remove so as to |
|
602 |
* avoid missing traversing elements. |
|
603 |
*/ |
|
32991
b27c76b82713
8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
604 |
E removeAt(int i) { |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
605 |
// assert i >= 0 && i < size; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
606 |
final Object[] es = queue; |
2 | 607 |
modCount++; |
608 |
int s = --size; |
|
609 |
if (s == i) // removed last element |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
610 |
es[i] = null; |
2 | 611 |
else { |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
612 |
E moved = (E) es[s]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
613 |
es[s] = null; |
2 | 614 |
siftDown(i, moved); |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
615 |
if (es[i] == moved) { |
2 | 616 |
siftUp(i, moved); |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
617 |
if (es[i] != moved) |
2 | 618 |
return moved; |
619 |
} |
|
620 |
} |
|
621 |
return null; |
|
622 |
} |
|
623 |
||
624 |
/** |
|
625 |
* Inserts item x at position k, maintaining heap invariant by |
|
626 |
* promoting x up the tree until it is greater than or equal to |
|
627 |
* its parent, or is the root. |
|
628 |
* |
|
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
629 |
* To simplify and speed up coercions and comparisons, the |
2 | 630 |
* Comparable and Comparator versions are separated into different |
631 |
* methods that are otherwise identical. (Similarly for siftDown.) |
|
632 |
* |
|
633 |
* @param k the position to fill |
|
634 |
* @param x the item to insert |
|
635 |
*/ |
|
636 |
private void siftUp(int k, E x) { |
|
637 |
if (comparator != null) |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
638 |
siftUpUsingComparator(k, x, queue, comparator); |
2 | 639 |
else |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
640 |
siftUpComparable(k, x, queue); |
2 | 641 |
} |
642 |
||
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
643 |
private static <T> void siftUpComparable(int k, T x, Object[] es) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
644 |
Comparable<? super T> key = (Comparable<? super T>) x; |
2 | 645 |
while (k > 0) { |
646 |
int parent = (k - 1) >>> 1; |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
647 |
Object e = es[parent]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
648 |
if (key.compareTo((T) e) >= 0) |
2 | 649 |
break; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
650 |
es[k] = e; |
2 | 651 |
k = parent; |
652 |
} |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
653 |
es[k] = key; |
2 | 654 |
} |
655 |
||
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
656 |
private static <T> void siftUpUsingComparator( |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
657 |
int k, T x, Object[] es, Comparator<? super T> cmp) { |
2 | 658 |
while (k > 0) { |
659 |
int parent = (k - 1) >>> 1; |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
660 |
Object e = es[parent]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
661 |
if (cmp.compare(x, (T) e) >= 0) |
2 | 662 |
break; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
663 |
es[k] = e; |
2 | 664 |
k = parent; |
665 |
} |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
666 |
es[k] = x; |
2 | 667 |
} |
668 |
||
669 |
/** |
|
670 |
* Inserts item x at position k, maintaining heap invariant by |
|
671 |
* demoting x down the tree repeatedly until it is less than or |
|
672 |
* equal to its children or is a leaf. |
|
673 |
* |
|
674 |
* @param k the position to fill |
|
675 |
* @param x the item to insert |
|
676 |
*/ |
|
677 |
private void siftDown(int k, E x) { |
|
678 |
if (comparator != null) |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
679 |
siftDownUsingComparator(k, x, queue, size, comparator); |
2 | 680 |
else |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
681 |
siftDownComparable(k, x, queue, size); |
2 | 682 |
} |
683 |
||
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
684 |
private static <T> void siftDownComparable(int k, T x, Object[] es, int n) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
685 |
// assert n > 0; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
686 |
Comparable<? super T> key = (Comparable<? super T>)x; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
687 |
int half = n >>> 1; // loop while a non-leaf |
2 | 688 |
while (k < half) { |
689 |
int child = (k << 1) + 1; // assume left child is least |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
690 |
Object c = es[child]; |
2 | 691 |
int right = child + 1; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
692 |
if (right < n && |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
693 |
((Comparable<? super T>) c).compareTo((T) es[right]) > 0) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
694 |
c = es[child = right]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
695 |
if (key.compareTo((T) c) <= 0) |
2 | 696 |
break; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
697 |
es[k] = c; |
2 | 698 |
k = child; |
699 |
} |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
700 |
es[k] = key; |
2 | 701 |
} |
702 |
||
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
703 |
private static <T> void siftDownUsingComparator( |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
704 |
int k, T x, Object[] es, int n, Comparator<? super T> cmp) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
705 |
// assert n > 0; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
706 |
int half = n >>> 1; |
2 | 707 |
while (k < half) { |
708 |
int child = (k << 1) + 1; |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
709 |
Object c = es[child]; |
2 | 710 |
int right = child + 1; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
711 |
if (right < n && cmp.compare((T) c, (T) es[right]) > 0) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
712 |
c = es[child = right]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
713 |
if (cmp.compare(x, (T) c) <= 0) |
2 | 714 |
break; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
715 |
es[k] = c; |
2 | 716 |
k = child; |
717 |
} |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
718 |
es[k] = x; |
2 | 719 |
} |
720 |
||
721 |
/** |
|
722 |
* Establishes the heap invariant (described above) in the entire tree, |
|
723 |
* assuming nothing about the order of the elements prior to the call. |
|
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
724 |
* This classic algorithm due to Floyd (1964) is known to be O(size). |
2 | 725 |
*/ |
726 |
private void heapify() { |
|
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
727 |
final Object[] es = queue; |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
728 |
int n = size, i = (n >>> 1) - 1; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
729 |
final Comparator<? super E> cmp; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
730 |
if ((cmp = comparator) == null) |
43522
f9c6f543c4db
8171886: Miscellaneous changes imported from jsr166 CVS 2017-02
dl
parents:
42927
diff
changeset
|
731 |
for (; i >= 0; i--) |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
732 |
siftDownComparable(i, (E) es[i], es, n); |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
733 |
else |
43522
f9c6f543c4db
8171886: Miscellaneous changes imported from jsr166 CVS 2017-02
dl
parents:
42927
diff
changeset
|
734 |
for (; i >= 0; i--) |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
735 |
siftDownUsingComparator(i, (E) es[i], es, n, cmp); |
2 | 736 |
} |
737 |
||
738 |
/** |
|
739 |
* Returns the comparator used to order the elements in this |
|
740 |
* queue, or {@code null} if this queue is sorted according to |
|
741 |
* the {@linkplain Comparable natural ordering} of its elements. |
|
742 |
* |
|
743 |
* @return the comparator used to order this queue, or |
|
744 |
* {@code null} if this queue is sorted according to the |
|
745 |
* natural ordering of its elements |
|
746 |
*/ |
|
747 |
public Comparator<? super E> comparator() { |
|
748 |
return comparator; |
|
749 |
} |
|
750 |
||
751 |
/** |
|
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
752 |
* Saves this queue to a stream (that is, serializes it). |
2 | 753 |
* |
40817
4f5fb115676d
8164169: Miscellaneous changes imported from jsr166 CVS 2016-09
dl
parents:
39039
diff
changeset
|
754 |
* @param s the stream |
4f5fb115676d
8164169: Miscellaneous changes imported from jsr166 CVS 2016-09
dl
parents:
39039
diff
changeset
|
755 |
* @throws java.io.IOException if an I/O error occurs |
2 | 756 |
* @serialData The length of the array backing the instance is |
757 |
* emitted (int), followed by all of its elements |
|
758 |
* (each an {@code Object}) in the proper order. |
|
759 |
*/ |
|
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
54971
diff
changeset
|
760 |
@java.io.Serial |
2 | 761 |
private void writeObject(java.io.ObjectOutputStream s) |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
762 |
throws java.io.IOException { |
2 | 763 |
// Write out element count, and any hidden stuff |
764 |
s.defaultWriteObject(); |
|
765 |
||
766 |
// Write out array length, for compatibility with 1.5 version |
|
767 |
s.writeInt(Math.max(2, size + 1)); |
|
768 |
||
769 |
// Write out all elements in the "proper order". |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
770 |
final Object[] es = queue; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
771 |
for (int i = 0, n = size; i < n; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
772 |
s.writeObject(es[i]); |
2 | 773 |
} |
774 |
||
775 |
/** |
|
776 |
* Reconstitutes the {@code PriorityQueue} instance from a stream |
|
777 |
* (that is, deserializes it). |
|
778 |
* |
|
779 |
* @param s the stream |
|
32991
b27c76b82713
8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
780 |
* @throws ClassNotFoundException if the class of a serialized object |
b27c76b82713
8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
781 |
* could not be found |
b27c76b82713
8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
782 |
* @throws java.io.IOException if an I/O error occurs |
2 | 783 |
*/ |
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
54971
diff
changeset
|
784 |
@java.io.Serial |
2 | 785 |
private void readObject(java.io.ObjectInputStream s) |
786 |
throws java.io.IOException, ClassNotFoundException { |
|
787 |
// Read in size, and any hidden stuff |
|
788 |
s.defaultReadObject(); |
|
789 |
||
790 |
// Read in (and discard) array length |
|
791 |
s.readInt(); |
|
792 |
||
47423 | 793 |
SharedSecrets.getJavaObjectInputStreamAccess().checkArray(s, Object[].class, size); |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
794 |
final Object[] es = queue = new Object[Math.max(size, 1)]; |
2 | 795 |
|
796 |
// Read in all elements. |
|
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
797 |
for (int i = 0, n = size; i < n; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
798 |
es[i] = s.readObject(); |
2 | 799 |
|
800 |
// Elements are guaranteed to be in "proper order", but the |
|
801 |
// spec has never explained what that might be. |
|
802 |
heapify(); |
|
803 |
} |
|
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
804 |
|
19435
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
805 |
/** |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
806 |
* Creates a <em><a href="Spliterator.html#binding">late-binding</a></em> |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
807 |
* and <em>fail-fast</em> {@link Spliterator} over the elements in this |
42226
f55cb692058f
8132964: Spliterator documentation on Priority(Blocking)Queue
psandoz
parents:
40817
diff
changeset
|
808 |
* queue. The spliterator does not traverse elements in any particular order |
f55cb692058f
8132964: Spliterator documentation on Priority(Blocking)Queue
psandoz
parents:
40817
diff
changeset
|
809 |
* (the {@link Spliterator#ORDERED ORDERED} characteristic is not reported). |
19435
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
810 |
* |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
811 |
* <p>The {@code Spliterator} reports {@link Spliterator#SIZED}, |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
812 |
* {@link Spliterator#SUBSIZED}, and {@link Spliterator#NONNULL}. |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
813 |
* Overriding implementations should document the reporting of additional |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
814 |
* characteristic values. |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
815 |
* |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
816 |
* @return a {@code Spliterator} over the elements in this queue |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
817 |
* @since 1.8 |
9d7530ff42cb
8014824: Document Spliterator characteristics and binding policy of java util collection impls
psandoz
parents:
19059
diff
changeset
|
818 |
*/ |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
819 |
public final Spliterator<E> spliterator() { |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
820 |
return new PriorityQueueSpliterator(0, -1, 0); |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
821 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
822 |
|
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
823 |
final class PriorityQueueSpliterator implements Spliterator<E> { |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
824 |
private int index; // current index, modified on advance/split |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
825 |
private int fence; // -1 until first use |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
826 |
private int expectedModCount; // initialized when fence set |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
827 |
|
32991
b27c76b82713
8134853: Bulk integration of java.util.concurrent classes
dl
parents:
26451
diff
changeset
|
828 |
/** Creates new spliterator covering the given range. */ |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
829 |
PriorityQueueSpliterator(int origin, int fence, int expectedModCount) { |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
830 |
this.index = origin; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
831 |
this.fence = fence; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
832 |
this.expectedModCount = expectedModCount; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
833 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
834 |
|
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
835 |
private int getFence() { // initialize fence to size on first use |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
836 |
int hi; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
837 |
if ((hi = fence) < 0) { |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
838 |
expectedModCount = modCount; |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
839 |
hi = fence = size; |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
840 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
841 |
return hi; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
842 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
843 |
|
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
844 |
public PriorityQueueSpliterator trySplit() { |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
845 |
int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
846 |
return (lo >= mid) ? null : |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
847 |
new PriorityQueueSpliterator(lo, index = mid, expectedModCount); |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
848 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
849 |
|
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
850 |
public void forEachRemaining(Consumer<? super E> action) { |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
851 |
if (action == null) |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
852 |
throw new NullPointerException(); |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
853 |
if (fence < 0) { fence = size; expectedModCount = modCount; } |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
854 |
final Object[] es = queue; |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
855 |
int i, hi; E e; |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
856 |
for (i = index, index = hi = fence; i < hi; i++) { |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
857 |
if ((e = (E) es[i]) == null) |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
858 |
break; // must be CME |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
859 |
action.accept(e); |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
860 |
} |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
861 |
if (modCount != expectedModCount) |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
862 |
throw new ConcurrentModificationException(); |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
863 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
864 |
|
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
865 |
public boolean tryAdvance(Consumer<? super E> action) { |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
866 |
if (action == null) |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
867 |
throw new NullPointerException(); |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
868 |
if (fence < 0) { fence = size; expectedModCount = modCount; } |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
869 |
int i; |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
870 |
if ((i = index) < fence) { |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
871 |
index = i + 1; |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
872 |
E e; |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
873 |
if ((e = (E) queue[i]) == null |
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
874 |
|| modCount != expectedModCount) |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
875 |
throw new ConcurrentModificationException(); |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
876 |
action.accept(e); |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
877 |
return true; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
878 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
879 |
return false; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
880 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
881 |
|
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
882 |
public long estimateSize() { |
42927
1d31e540bfcb
8170484: Miscellaneous changes imported from jsr166 CVS 2016-12
dl
parents:
42226
diff
changeset
|
883 |
return getFence() - index; |
17168
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
884 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
885 |
|
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
886 |
public int characteristics() { |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
887 |
return Spliterator.SIZED | Spliterator.SUBSIZED | Spliterator.NONNULL; |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
888 |
} |
b7d3500f2516
8011426: java.util collection Spliterator implementations
psandoz
parents:
13795
diff
changeset
|
889 |
} |
50229
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
890 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
891 |
/** |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
892 |
* @throws NullPointerException {@inheritDoc} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
893 |
*/ |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
894 |
public boolean removeIf(Predicate<? super E> filter) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
895 |
Objects.requireNonNull(filter); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
896 |
return bulkRemove(filter); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
897 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
898 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
899 |
/** |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
900 |
* @throws NullPointerException {@inheritDoc} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
901 |
*/ |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
902 |
public boolean removeAll(Collection<?> c) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
903 |
Objects.requireNonNull(c); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
904 |
return bulkRemove(e -> c.contains(e)); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
905 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
906 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
907 |
/** |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
908 |
* @throws NullPointerException {@inheritDoc} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
909 |
*/ |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
910 |
public boolean retainAll(Collection<?> c) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
911 |
Objects.requireNonNull(c); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
912 |
return bulkRemove(e -> !c.contains(e)); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
913 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
914 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
915 |
// A tiny bit set implementation |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
916 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
917 |
private static long[] nBits(int n) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
918 |
return new long[((n - 1) >> 6) + 1]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
919 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
920 |
private static void setBit(long[] bits, int i) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
921 |
bits[i >> 6] |= 1L << i; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
922 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
923 |
private static boolean isClear(long[] bits, int i) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
924 |
return (bits[i >> 6] & (1L << i)) == 0; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
925 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
926 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
927 |
/** Implementation of bulk remove methods. */ |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
928 |
private boolean bulkRemove(Predicate<? super E> filter) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
929 |
final int expectedModCount = ++modCount; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
930 |
final Object[] es = queue; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
931 |
final int end = size; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
932 |
int i; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
933 |
// Optimize for initial run of survivors |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
934 |
for (i = 0; i < end && !filter.test((E) es[i]); i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
935 |
; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
936 |
if (i >= end) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
937 |
if (modCount != expectedModCount) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
938 |
throw new ConcurrentModificationException(); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
939 |
return false; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
940 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
941 |
// Tolerate predicates that reentrantly access the collection for |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
942 |
// read (but writers still get CME), so traverse once to find |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
943 |
// elements to delete, a second pass to physically expunge. |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
944 |
final int beg = i; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
945 |
final long[] deathRow = nBits(end - beg); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
946 |
deathRow[0] = 1L; // set bit 0 |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
947 |
for (i = beg + 1; i < end; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
948 |
if (filter.test((E) es[i])) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
949 |
setBit(deathRow, i - beg); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
950 |
if (modCount != expectedModCount) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
951 |
throw new ConcurrentModificationException(); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
952 |
int w = beg; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
953 |
for (i = beg; i < end; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
954 |
if (isClear(deathRow, i - beg)) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
955 |
es[w++] = es[i]; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
956 |
for (i = size = w; i < end; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
957 |
es[i] = null; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
958 |
heapify(); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
959 |
return true; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
960 |
} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
961 |
|
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
962 |
/** |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
963 |
* @throws NullPointerException {@inheritDoc} |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
964 |
*/ |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
965 |
public void forEach(Consumer<? super E> action) { |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
966 |
Objects.requireNonNull(action); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
967 |
final int expectedModCount = modCount; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
968 |
final Object[] es = queue; |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
969 |
for (int i = 0, n = size; i < n; i++) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
970 |
action.accept((E) es[i]); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
971 |
if (expectedModCount != modCount) |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
972 |
throw new ConcurrentModificationException(); |
6b29ef846c5c
8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
dl
parents:
49433
diff
changeset
|
973 |
} |
2 | 974 |
} |