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/* |
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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* Copyright (c) 2003, 2018, 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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import java.util.function.Consumer; |
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import jdk.internal.misc.SharedSecrets; |
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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}/../technotes/guides/collections/index.html"> |
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* <a href="{@docRoot}/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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*/ |
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private int expectedModCount = modCount; |
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Itr() {} // prevent access constructor creation |
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|
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public boolean hasNext() { |
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return cursor < size || |
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(forgetMeNot != null && !forgetMeNot.isEmpty()); |
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* promoting x up the tree until it is greater than or equal to |
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* its parent, or is the root. |
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* |
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* To simplify and speed up coercions and comparisons. the |
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* To simplify and speed up coercions and comparisons, the |
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* Comparable and Comparator versions are separated into different |
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* methods that are otherwise identical. (Similarly for siftDown.) |
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* |
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*/ |
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@SuppressWarnings("unchecked") |
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private void heapify() { |
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for (int i = (size >>> 1) - 1; i >= 0; i--) |
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siftDown(i, (E) queue[i]); |
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final Object[] es = queue; |
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int i = (size >>> 1) - 1; |
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if (comparator == null) |
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for (; i >= 0; i--) |
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siftDownComparable(i, (E) es[i]); |
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else |
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for (; i >= 0; i--) |
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siftDownUsingComparator(i, (E) es[i]); |
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} |
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/** |
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// Read in (and discard) array length |
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s.readInt(); |
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|
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SharedSecrets.getJavaObjectInputStreamAccess().checkArray(s, Object[].class, size); |
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queue = new Object[size]; |
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// Read in all elements. |
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} |
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final class PriorityQueueSpliterator implements Spliterator<E> { |
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/* |
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* This is very similar to ArrayList Spliterator, except for |
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* extra null checks. |
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*/ |
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private int index; // current index, modified on advance/split |
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private int fence; // -1 until first use |
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private int expectedModCount; // initialized when fence set |
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@SuppressWarnings("unchecked") |
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public void forEachRemaining(Consumer<? super E> action) { |
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int i, hi, mc; // hoist accesses and checks from loop |
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final Object[] a; |
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if (action == null) |
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throw new NullPointerException(); |
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if ((a = queue) != null) { |
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if ((hi = fence) < 0) { |
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mc = modCount; |
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hi = size; |
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} |
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else |
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mc = expectedModCount; |
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if ((i = index) >= 0 && (index = hi) <= a.length) { |
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for (E e;; ++i) { |
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if (i < hi) { |
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if ((e = (E) a[i]) == null) // must be CME |
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break; |
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action.accept(e); |
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} |
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else if (modCount != mc) |
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break; |
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else |
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return; |
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} |
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} |
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if (fence < 0) { fence = size; expectedModCount = modCount; } |
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final Object[] a = queue; |
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int i, hi; E e; |
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for (i = index, index = hi = fence; i < hi; i++) { |
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if ((e = (E) a[i]) == null) |
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break; // must be CME |
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action.accept(e); |
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} |
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throw new ConcurrentModificationException(); |
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if (modCount != expectedModCount) |
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throw new ConcurrentModificationException(); |
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} |
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@SuppressWarnings("unchecked") |
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public boolean tryAdvance(Consumer<? super E> action) { |
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if (action == null) |
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throw new NullPointerException(); |
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int hi = getFence(), lo = index; |
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if (lo >= 0 && lo < hi) { |
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index = lo + 1; |
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@SuppressWarnings("unchecked") E e = (E)queue[lo]; |
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if (e == null) |
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if (fence < 0) { fence = size; expectedModCount = modCount; } |
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int i; |
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if ((i = index) < fence) { |
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index = i + 1; |
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E e; |
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if ((e = (E) queue[i]) == null |
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|| modCount != expectedModCount) |
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throw new ConcurrentModificationException(); |
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action.accept(e); |
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if (modCount != expectedModCount) |
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throw new ConcurrentModificationException(); |
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return true; |
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} |
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return false; |
