550 lines
16 KiB
Java
550 lines
16 KiB
Java
/*
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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.
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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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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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* Other contributors include Andrew Wright, Jeffrey Hayes,
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* Pat Fisher, Mike Judd.
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*/
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.PriorityQueue;
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import java.util.Queue;
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import junit.framework.Test;
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public class PriorityQueueTest extends JSR166TestCase {
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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class Implementation implements CollectionImplementation {
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public Class<?> klazz() { return PriorityQueue.class; }
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public Collection emptyCollection() { return new PriorityQueue(); }
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
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public boolean isConcurrent() { return false; }
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public boolean permitsNulls() { return false; }
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}
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class ComparatorImplementation implements CollectionImplementation {
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public Class<?> klazz() { return PriorityQueue.class; }
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@SuppressWarnings("unchecked")
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public Collection emptyCollection() {
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return new PriorityQueue(new MyReverseComparator());
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}
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
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public boolean isConcurrent() { return false; }
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public boolean permitsNulls() { return false; }
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}
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return newTestSuite(
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PriorityQueueTest.class,
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CollectionTest.testSuite(new Implementation()),
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CollectionTest.testSuite(new ComparatorImplementation()));
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}
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static class MyReverseComparator implements Comparator, java.io.Serializable {
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@SuppressWarnings("unchecked")
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public int compare(Object x, Object y) {
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return ((Comparable)y).compareTo(x);
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}
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}
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/**
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* Returns a new queue of given size containing consecutive
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* Items 0 ... n - 1.
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*/
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private static PriorityQueue<Item> populatedQueue(int n) {
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PriorityQueue<Item> q = new PriorityQueue<>(n);
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assertTrue(q.isEmpty());
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for (int i = n - 1; i >= 0; i -= 2)
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mustOffer(q, i);
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for (int i = (n & 1); i < n; i += 2)
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mustOffer(q, i);
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assertFalse(q.isEmpty());
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mustEqual(n, q.size());
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mustEqual(0, q.peek());
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return q;
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}
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/**
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* A new queue has unbounded capacity
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*/
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public void testConstructor1() {
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mustEqual(0, new PriorityQueue<Item>(SIZE).size());
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}
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/**
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* Constructor throws IllegalArgumentException if capacity argument nonpositive
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*/
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public void testConstructor2() {
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try {
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new PriorityQueue<Item>(0);
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shouldThrow();
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} catch (IllegalArgumentException success) {}
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}
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/**
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* Initializing from null Collection throws NPE
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*/
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public void testConstructor3() {
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try {
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new PriorityQueue<Item>((Collection<Item>)null);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Initializing from Collection of null elements throws NPE
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*/
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public void testConstructor4() {
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try {
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new PriorityQueue<Item>(Arrays.asList(new Item[SIZE]));
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Initializing from Collection with some null elements throws NPE
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*/
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public void testConstructor5() {
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Item[] items = new Item[2];
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items[0] = zero;
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try {
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new PriorityQueue<Item>(Arrays.asList(items));
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Queue contains all elements of collection used to initialize
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*/
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public void testConstructor6() {
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Item[] items = defaultItems;
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PriorityQueue<Item> q = new PriorityQueue<>(Arrays.asList(items));
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for (int i = 0; i < SIZE; ++i)
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mustEqual(items[i], q.poll());
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}
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/**
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* The comparator used in constructor is used
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*/
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public void testConstructor7() {
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MyReverseComparator cmp = new MyReverseComparator();
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@SuppressWarnings("unchecked")
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PriorityQueue<Item> q = new PriorityQueue<>(SIZE, cmp);
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assertEquals(cmp, q.comparator());
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Item[] items = seqItems(SIZE);
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q.addAll(Arrays.asList(items));
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for (int i = SIZE - 1; i >= 0; --i)
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mustEqual(items[i], q.poll());
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}
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/**
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* isEmpty is true before add, false after
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*/
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public void testEmpty() {
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PriorityQueue<Item> q = new PriorityQueue<>(2);
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assertTrue(q.isEmpty());
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q.add(one);
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assertFalse(q.isEmpty());
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q.add(two);
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q.remove();
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q.remove();
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assertTrue(q.isEmpty());
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}
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/**
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* size changes when elements added and removed
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*/
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public void testSize() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(SIZE - i, q.size());
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q.remove();
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}
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.size());
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mustAdd(q, i);
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}
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}
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/**
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* offer(null) throws NPE
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*/
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public void testOfferNull() {
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PriorityQueue<Item> q = new PriorityQueue<>(1);
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try {
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q.offer(null);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* add(null) throws NPE
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*/
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public void testAddNull() {
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PriorityQueue<Item> q = new PriorityQueue<>(1);
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try {
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q.add(null);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Offer of comparable element succeeds
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*/
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public void testOffer() {
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PriorityQueue<Item> q = new PriorityQueue<>(1);
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assertTrue(q.offer(zero));
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assertTrue(q.offer(one));
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}
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/**
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* Offer of non-Comparable throws CCE
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*/
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public void testOfferNonComparable() {
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PriorityQueue<Object> q = new PriorityQueue<>(1);
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try {
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q.offer(new Object());
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shouldThrow();
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} catch (ClassCastException success) {
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assertTrue(q.isEmpty());
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mustEqual(0, q.size());
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assertNull(q.poll());
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}
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}
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/**
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* add of comparable succeeds
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*/
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public void testAdd() {
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PriorityQueue<Item> q = new PriorityQueue<>(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.size());
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mustAdd(q, i);
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}
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}
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/**
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* addAll(null) throws NPE
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*/
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public void testAddAll1() {
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PriorityQueue<Item> q = new PriorityQueue<>(1);
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try {
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q.addAll(null);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* addAll of a collection with null elements throws NPE
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*/
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public void testAddAll2() {
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PriorityQueue<Item> q = new PriorityQueue<>(SIZE);
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try {
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q.addAll(Arrays.asList(new Item[SIZE]));
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* addAll of a collection with any null elements throws NPE after
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* possibly adding some elements
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*/
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public void testAddAll3() {
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PriorityQueue<Item> q = new PriorityQueue<>(SIZE);
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Item[] items = new Item[2];
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items[0] = zero;
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try {
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q.addAll(Arrays.asList(items));
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Queue contains all elements of successful addAll
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*/
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public void testAddAll5() {
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Item[] empty = new Item[0];
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Item[] items = new Item[SIZE];
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for (int i = 0; i < SIZE; ++i)
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items[i] = itemFor(SIZE - 1 - i);
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PriorityQueue<Item> q = new PriorityQueue<>(SIZE);
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assertFalse(q.addAll(Arrays.asList(empty)));
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assertTrue(q.addAll(Arrays.asList(items)));
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for (int i = 0; i < SIZE; ++i)
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mustEqual(i, q.poll());
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}
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/**
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* poll succeeds unless empty
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*/
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public void testPoll() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.poll());
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}
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assertNull(q.poll());
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}
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/**
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* peek returns next element, or null if empty
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*/
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public void testPeek() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.peek());
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mustEqual(i, q.poll());
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assertTrue(q.peek() == null ||
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!q.peek().equals(i));
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}
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assertNull(q.peek());
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}
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/**
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* element returns next element, or throws NSEE if empty
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*/
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public void testElement() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.element());
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mustEqual(i, q.poll());
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}
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try {
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q.element();
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shouldThrow();
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} catch (NoSuchElementException success) {}
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}
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/**
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* remove removes next element, or throws NSEE if empty
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*/
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public void testRemove() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.remove());
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}
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try {
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q.remove();
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shouldThrow();
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} catch (NoSuchElementException success) {}
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}
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/**
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* remove(x) removes x and returns true if present
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*/
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public void testRemoveElement() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 1; i < SIZE; i += 2) {
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mustContain(q, i);
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mustRemove(q, i);
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mustNotContain(q, i);
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mustContain(q, i - 1);
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}
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for (int i = 0; i < SIZE; i += 2) {
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mustContain(q, i);
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mustRemove(q, i);
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mustNotContain(q, i);
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mustNotRemove(q, i + 1);
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mustNotContain(q, i + 1);
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}
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assertTrue(q.isEmpty());
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}
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/**
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* contains(x) reports true when elements added but not yet removed
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*/
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public void testContains() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustContain(q, i);
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q.poll();
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mustNotContain(q, i);
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}
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}
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/**
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* clear removes all elements
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*/
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public void testClear() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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q.clear();
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assertTrue(q.isEmpty());
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mustEqual(0, q.size());
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q.add(one);
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assertFalse(q.isEmpty());
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q.clear();
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assertTrue(q.isEmpty());
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}
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/**
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* containsAll(c) is true when c contains a subset of elements
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*/
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public void testContainsAll() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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PriorityQueue<Item> p = new PriorityQueue<>(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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assertTrue(q.containsAll(p));
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assertFalse(p.containsAll(q));
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mustAdd(p, i);
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}
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assertTrue(p.containsAll(q));
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}
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/**
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* retainAll(c) retains only those elements of c and reports true if changed
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*/
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public void testRetainAll() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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PriorityQueue<Item> p = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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boolean changed = q.retainAll(p);
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if (i == 0)
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assertFalse(changed);
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else
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assertTrue(changed);
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assertTrue(q.containsAll(p));
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mustEqual(SIZE - i, q.size());
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p.remove();
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}
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}
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/**
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* removeAll(c) removes only those elements of c and reports true if changed
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*/
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public void testRemoveAll() {
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for (int i = 1; i < SIZE; ++i) {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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PriorityQueue<Item> p = populatedQueue(i);
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assertTrue(q.removeAll(p));
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mustEqual(SIZE - i, q.size());
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for (int j = 0; j < i; ++j) {
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mustNotContain(q, p.remove());
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}
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}
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}
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/**
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* toArray contains all elements
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*/
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public void testToArray() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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Object[] a = q.toArray();
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assertSame(Object[].class, a.getClass());
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Arrays.sort(a);
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for (Object o : a)
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assertSame(o, q.poll());
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assertTrue(q.isEmpty());
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}
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/**
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* toArray(a) contains all elements
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*/
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public void testToArray2() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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Item[] items = new Item[SIZE];
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Item[] array = q.toArray(items);
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assertSame(items, array);
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Arrays.sort(items);
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for (Item o : items)
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assertSame(o, q.poll());
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assertTrue(q.isEmpty());
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}
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/**
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* iterator iterates through all elements
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*/
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public void testIterator() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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Iterator<? extends Item> it = q.iterator();
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int i;
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for (i = 0; it.hasNext(); i++)
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mustContain(q, it.next());
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mustEqual(i, SIZE);
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assertIteratorExhausted(it);
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}
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/**
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* iterator of empty collection has no elements
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*/
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public void testEmptyIterator() {
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assertIteratorExhausted(new PriorityQueue<Item>().iterator());
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}
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/**
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* iterator.remove removes current element
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*/
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public void testIteratorRemove() {
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final PriorityQueue<Item> q = new PriorityQueue<>(3);
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q.add(two);
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q.add(one);
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q.add(three);
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Iterator<? extends Item> it = q.iterator();
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it.next();
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it.remove();
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it = q.iterator();
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mustEqual(it.next(), two);
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mustEqual(it.next(), three);
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assertFalse(it.hasNext());
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}
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/**
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* toString contains toStrings of elements
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*/
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public void testToString() {
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PriorityQueue<Item> q = populatedQueue(SIZE);
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String s = q.toString();
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for (int i = 0; i < SIZE; ++i) {
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assertTrue(s.contains(String.valueOf(i)));
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}
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}
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/**
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* A deserialized/reserialized queue has same elements
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*/
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public void testSerialization() throws Exception {
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Queue<Item> x = populatedQueue(SIZE);
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Queue<Item> y = serialClone(x);
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assertNotSame(x, y);
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mustEqual(x.size(), y.size());
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while (!x.isEmpty()) {
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assertFalse(y.isEmpty());
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mustEqual(x.remove(), y.remove());
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}
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assertTrue(y.isEmpty());
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}
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}
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