733 lines
24 KiB
Java
733 lines
24 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.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import java.util.ListIterator;
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import java.util.NoSuchElementException;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.ThreadLocalRandom;
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import junit.framework.Test;
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public class CopyOnWriteArrayListTest 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 CopyOnWriteArrayList.class; }
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public List emptyCollection() { return new CopyOnWriteArrayList(); }
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public Object makeElement(int i) { return i; }
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public boolean isConcurrent() { return true; }
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public boolean permitsNulls() { return true; }
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}
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class SubListImplementation extends Implementation {
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public List emptyCollection() {
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List list = super.emptyCollection();
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ThreadLocalRandom rnd = ThreadLocalRandom.current();
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if (rnd.nextBoolean())
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list.add(makeElement(rnd.nextInt()));
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int i = rnd.nextInt(list.size() + 1);
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return list.subList(i, i);
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}
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}
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return newTestSuite(
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CopyOnWriteArrayListTest.class,
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CollectionTest.testSuite(new Implementation()),
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CollectionTest.testSuite(new SubListImplementation()));
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}
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static CopyOnWriteArrayList<Integer> populatedList(int n) {
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CopyOnWriteArrayList<Integer> list = new CopyOnWriteArrayList<>();
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assertTrue(list.isEmpty());
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for (int i = 0; i < n; i++)
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list.add(i);
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assertEquals(n <= 0, list.isEmpty());
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assertEquals(n, list.size());
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return list;
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}
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static CopyOnWriteArrayList<Integer> populatedList(Integer[] elements) {
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CopyOnWriteArrayList<Integer> list = new CopyOnWriteArrayList<>();
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assertTrue(list.isEmpty());
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for (Integer element : elements)
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list.add(element);
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assertFalse(list.isEmpty());
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assertEquals(elements.length, list.size());
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return list;
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}
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/**
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* a new list is empty
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*/
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public void testConstructor() {
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List list = new CopyOnWriteArrayList();
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assertTrue(list.isEmpty());
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}
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/**
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* new list contains all elements of initializing array
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*/
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public void testConstructor2() {
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Integer[] elts = new Integer[SIZE];
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for (int i = 0; i < SIZE - 1; ++i)
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elts[i] = i;
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List list = new CopyOnWriteArrayList(elts);
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for (int i = 0; i < SIZE; ++i)
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assertEquals(elts[i], list.get(i));
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}
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/**
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* new list contains all elements of initializing collection
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*/
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public void testConstructor3() {
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Integer[] elts = new Integer[SIZE];
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for (int i = 0; i < SIZE - 1; ++i)
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elts[i] = i;
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List list = new CopyOnWriteArrayList(Arrays.asList(elts));
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for (int i = 0; i < SIZE; ++i)
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assertEquals(elts[i], list.get(i));
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}
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/**
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* addAll adds each element from the given collection, including duplicates
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*/
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public void testAddAll() {
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List list = populatedList(3);
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assertTrue(list.addAll(Arrays.asList(three, four, five)));
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assertEquals(6, list.size());
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assertTrue(list.addAll(Arrays.asList(three, four, five)));
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assertEquals(9, list.size());
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}
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/**
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* addAllAbsent adds each element from the given collection that did not
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* already exist in the List
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*/
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public void testAddAllAbsent() {
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CopyOnWriteArrayList list = populatedList(3);
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// "one" is duplicate and will not be added
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assertEquals(2, list.addAllAbsent(Arrays.asList(three, four, one)));
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assertEquals(5, list.size());
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assertEquals(0, list.addAllAbsent(Arrays.asList(three, four, one)));
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assertEquals(5, list.size());
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}
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/**
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* addIfAbsent will not add the element if it already exists in the list
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*/
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public void testAddIfAbsent() {
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CopyOnWriteArrayList list = populatedList(SIZE);
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list.addIfAbsent(one);
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assertEquals(SIZE, list.size());
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}
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/**
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* addIfAbsent adds the element when it does not exist in the list
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*/
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public void testAddIfAbsent2() {
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CopyOnWriteArrayList list = populatedList(SIZE);
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list.addIfAbsent(three);
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assertTrue(list.contains(three));
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}
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/**
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* clear removes all elements from the list
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*/
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public void testClear() {
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List list = populatedList(SIZE);
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list.clear();
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assertEquals(0, list.size());
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}
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/**
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* Cloned list is equal
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*/
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public void testClone() {
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CopyOnWriteArrayList l1 = populatedList(SIZE);
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CopyOnWriteArrayList l2 = (CopyOnWriteArrayList)(l1.clone());
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assertEquals(l1, l2);
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l1.clear();
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assertFalse(l1.equals(l2));
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}
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/**
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* contains is true for added elements
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*/
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public void testContains() {
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List list = populatedList(3);
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assertTrue(list.contains(one));
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assertFalse(list.contains(five));
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}
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/**
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* adding at an index places it in the indicated index
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*/
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public void testAddIndex() {
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List list = populatedList(3);
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list.add(0, m1);
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assertEquals(4, list.size());
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assertEquals(m1, list.get(0));
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assertEquals(zero, list.get(1));
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list.add(2, m2);
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assertEquals(5, list.size());
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assertEquals(m2, list.get(2));
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assertEquals(two, list.get(4));
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}
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/**
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* lists with same elements are equal and have same hashCode
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*/
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public void testEquals() {
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List a = populatedList(3);
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List b = populatedList(3);
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assertTrue(a.equals(b));
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assertTrue(b.equals(a));
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assertTrue(a.containsAll(b));
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assertTrue(b.containsAll(a));
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assertEquals(a.hashCode(), b.hashCode());
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a.add(m1);
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assertFalse(a.equals(b));
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assertFalse(b.equals(a));
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assertTrue(a.containsAll(b));
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assertFalse(b.containsAll(a));
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b.add(m1);
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assertTrue(a.equals(b));
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assertTrue(b.equals(a));
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assertTrue(a.containsAll(b));
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assertTrue(b.containsAll(a));
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assertEquals(a.hashCode(), b.hashCode());
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assertFalse(a.equals(null));
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}
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/**
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* containsAll returns true for collections with subset of elements
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*/
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public void testContainsAll() {
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List list = populatedList(3);
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assertTrue(list.containsAll(Arrays.asList()));
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assertTrue(list.containsAll(Arrays.asList(one)));
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assertTrue(list.containsAll(Arrays.asList(one, two)));
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assertFalse(list.containsAll(Arrays.asList(one, two, six)));
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assertFalse(list.containsAll(Arrays.asList(six)));
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try {
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list.containsAll(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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* get returns the value at the given index
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*/
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public void testGet() {
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List list = populatedList(3);
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assertEquals(0, list.get(0));
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}
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/**
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* indexOf(Object) returns the index of the first occurrence of the
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* specified element in this list, or -1 if this list does not
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* contain the element
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*/
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public void testIndexOf() {
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List list = populatedList(3);
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assertEquals(-1, list.indexOf(-42));
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int size = list.size();
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for (int i = 0; i < size; i++) {
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assertEquals(i, list.indexOf(i));
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assertEquals(i, list.subList(0, size).indexOf(i));
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assertEquals(i, list.subList(0, i + 1).indexOf(i));
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assertEquals(-1, list.subList(0, i).indexOf(i));
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assertEquals(0, list.subList(i, size).indexOf(i));
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assertEquals(-1, list.subList(i + 1, size).indexOf(i));
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}
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list.add(1);
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assertEquals(1, list.indexOf(1));
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assertEquals(1, list.subList(0, size + 1).indexOf(1));
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assertEquals(0, list.subList(1, size + 1).indexOf(1));
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assertEquals(size - 2, list.subList(2, size + 1).indexOf(1));
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assertEquals(0, list.subList(size, size + 1).indexOf(1));
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assertEquals(-1, list.subList(size + 1, size + 1).indexOf(1));
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}
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/**
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* indexOf(E, int) returns the index of the first occurrence of the
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* specified element in this list, searching forwards from index,
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* or returns -1 if the element is not found
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*/
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public void testIndexOf2() {
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CopyOnWriteArrayList list = populatedList(3);
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int size = list.size();
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assertEquals(-1, list.indexOf(-42, 0));
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// we might expect IOOBE, but spec says otherwise
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assertEquals(-1, list.indexOf(0, size));
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assertEquals(-1, list.indexOf(0, Integer.MAX_VALUE));
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assertThrows(
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IndexOutOfBoundsException.class,
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() -> list.indexOf(0, -1),
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() -> list.indexOf(0, Integer.MIN_VALUE));
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for (int i = 0; i < size; i++) {
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assertEquals(i, list.indexOf(i, 0));
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assertEquals(i, list.indexOf(i, i));
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assertEquals(-1, list.indexOf(i, i + 1));
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}
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list.add(1);
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assertEquals(1, list.indexOf(1, 0));
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assertEquals(1, list.indexOf(1, 1));
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assertEquals(size, list.indexOf(1, 2));
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assertEquals(size, list.indexOf(1, size));
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}
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/**
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* isEmpty returns true when empty, else false
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*/
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public void testIsEmpty() {
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List empty = new CopyOnWriteArrayList();
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assertTrue(empty.isEmpty());
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assertTrue(empty.subList(0, 0).isEmpty());
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List full = populatedList(SIZE);
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assertFalse(full.isEmpty());
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assertTrue(full.subList(0, 0).isEmpty());
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assertTrue(full.subList(SIZE, SIZE).isEmpty());
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}
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/**
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* iterator() returns an iterator containing the elements of the
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* list in insertion order
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*/
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public void testIterator() {
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Collection empty = new CopyOnWriteArrayList();
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assertFalse(empty.iterator().hasNext());
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try {
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empty.iterator().next();
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shouldThrow();
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} catch (NoSuchElementException success) {}
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Integer[] elements = new Integer[SIZE];
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for (int i = 0; i < SIZE; i++)
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elements[i] = i;
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shuffle(elements);
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Collection<Integer> full = populatedList(elements);
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Iterator it = full.iterator();
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for (int j = 0; j < SIZE; j++) {
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assertTrue(it.hasNext());
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assertEquals(elements[j], it.next());
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}
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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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Collection c = new CopyOnWriteArrayList();
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assertIteratorExhausted(c.iterator());
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}
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/**
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* iterator.remove throws UnsupportedOperationException
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*/
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public void testIteratorRemove() {
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CopyOnWriteArrayList list = populatedList(SIZE);
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Iterator it = list.iterator();
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it.next();
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try {
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it.remove();
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shouldThrow();
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} catch (UnsupportedOperationException success) {}
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}
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/**
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* toString contains toString of elements
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*/
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public void testToString() {
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assertEquals("[]", new CopyOnWriteArrayList().toString());
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List list = populatedList(3);
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String s = list.toString();
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for (int i = 0; i < 3; ++i)
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assertTrue(s.contains(String.valueOf(i)));
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assertEquals(new ArrayList(list).toString(),
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list.toString());
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}
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/**
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* lastIndexOf(Object) returns the index of the last occurrence of
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* the specified element in this list, or -1 if this list does not
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* contain the element
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*/
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public void testLastIndexOf1() {
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List list = populatedList(3);
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assertEquals(-1, list.lastIndexOf(-42));
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int size = list.size();
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for (int i = 0; i < size; i++) {
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assertEquals(i, list.lastIndexOf(i));
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assertEquals(i, list.subList(0, size).lastIndexOf(i));
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assertEquals(i, list.subList(0, i + 1).lastIndexOf(i));
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assertEquals(-1, list.subList(0, i).lastIndexOf(i));
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assertEquals(0, list.subList(i, size).lastIndexOf(i));
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assertEquals(-1, list.subList(i + 1, size).lastIndexOf(i));
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}
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list.add(1);
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assertEquals(size, list.lastIndexOf(1));
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assertEquals(size, list.subList(0, size + 1).lastIndexOf(1));
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assertEquals(1, list.subList(0, size).lastIndexOf(1));
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assertEquals(0, list.subList(1, 2).lastIndexOf(1));
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assertEquals(-1, list.subList(0, 1).indexOf(1));
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}
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/**
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* lastIndexOf(E, int) returns the index of the last occurrence of the
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* specified element in this list, searching backwards from index, or
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* returns -1 if the element is not found
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*/
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public void testLastIndexOf2() {
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CopyOnWriteArrayList list = populatedList(3);
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// we might expect IOOBE, but spec says otherwise
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assertEquals(-1, list.lastIndexOf(0, -1));
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int size = list.size();
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assertThrows(
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IndexOutOfBoundsException.class,
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() -> list.lastIndexOf(0, size),
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() -> list.lastIndexOf(0, Integer.MAX_VALUE));
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for (int i = 0; i < size; i++) {
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assertEquals(i, list.lastIndexOf(i, i));
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assertEquals(list.indexOf(i), list.lastIndexOf(i, i));
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if (i > 0)
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assertEquals(-1, list.lastIndexOf(i, i - 1));
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}
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list.add(one);
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list.add(three);
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assertEquals(1, list.lastIndexOf(one, 1));
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assertEquals(1, list.lastIndexOf(one, 2));
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assertEquals(3, list.lastIndexOf(one, 3));
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assertEquals(3, list.lastIndexOf(one, 4));
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assertEquals(-1, list.lastIndexOf(three, 3));
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}
|
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|
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/**
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* listIterator traverses all elements
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|
*/
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public void testListIterator1() {
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List list = populatedList(SIZE);
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ListIterator i = list.listIterator();
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int j;
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for (j = 0; i.hasNext(); j++)
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assertEquals(j, i.next());
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|
assertEquals(SIZE, j);
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|
}
|
|
|
|
/**
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|
* listIterator only returns those elements after the given index
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|
*/
|
|
public void testListIterator2() {
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|
List list = populatedList(3);
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|
ListIterator i = list.listIterator(1);
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|
int j;
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for (j = 0; i.hasNext(); j++)
|
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assertEquals(j + 1, i.next());
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|
assertEquals(2, j);
|
|
}
|
|
|
|
/**
|
|
* remove(int) removes and returns the object at the given index
|
|
*/
|
|
public void testRemove_int() {
|
|
int SIZE = 3;
|
|
for (int i = 0; i < SIZE; i++) {
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|
List list = populatedList(SIZE);
|
|
assertEquals(i, list.remove(i));
|
|
assertEquals(SIZE - 1, list.size());
|
|
assertFalse(list.contains(new Integer(i)));
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|
}
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|
}
|
|
|
|
/**
|
|
* remove(Object) removes the object if found and returns true
|
|
*/
|
|
public void testRemove_Object() {
|
|
int SIZE = 3;
|
|
for (int i = 0; i < SIZE; i++) {
|
|
List list = populatedList(SIZE);
|
|
assertFalse(list.remove(new Integer(-42)));
|
|
assertTrue(list.remove(new Integer(i)));
|
|
assertEquals(SIZE - 1, list.size());
|
|
assertFalse(list.contains(new Integer(i)));
|
|
}
|
|
CopyOnWriteArrayList x = new CopyOnWriteArrayList(Arrays.asList(4, 5, 6));
|
|
assertTrue(x.remove(new Integer(6)));
|
|
assertEquals(x, Arrays.asList(4, 5));
|
|
assertTrue(x.remove(new Integer(4)));
|
|
assertEquals(x, Arrays.asList(5));
|
|
assertTrue(x.remove(new Integer(5)));
|
|
assertEquals(x, Arrays.asList());
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|
assertFalse(x.remove(new Integer(5)));
|
|
}
|
|
|
|
/**
|
|
* removeAll removes all elements from the given collection
|
|
*/
|
|
public void testRemoveAll() {
|
|
List list = populatedList(3);
|
|
assertTrue(list.removeAll(Arrays.asList(one, two)));
|
|
assertEquals(1, list.size());
|
|
assertFalse(list.removeAll(Arrays.asList(one, two)));
|
|
assertEquals(1, list.size());
|
|
}
|
|
|
|
/**
|
|
* set changes the element at the given index
|
|
*/
|
|
public void testSet() {
|
|
List list = populatedList(3);
|
|
assertEquals(2, list.set(2, four));
|
|
assertEquals(4, list.get(2));
|
|
}
|
|
|
|
/**
|
|
* size returns the number of elements
|
|
*/
|
|
public void testSize() {
|
|
List empty = new CopyOnWriteArrayList();
|
|
assertEquals(0, empty.size());
|
|
assertEquals(0, empty.subList(0, 0).size());
|
|
|
|
List full = populatedList(SIZE);
|
|
assertEquals(SIZE, full.size());
|
|
assertEquals(0, full.subList(0, 0).size());
|
|
assertEquals(0, full.subList(SIZE, SIZE).size());
|
|
}
|
|
|
|
/**
|
|
* toArray() returns an Object array containing all elements from
|
|
* the list in insertion order
|
|
*/
|
|
public void testToArray() {
|
|
Object[] a = new CopyOnWriteArrayList().toArray();
|
|
assertTrue(Arrays.equals(new Object[0], a));
|
|
assertSame(Object[].class, a.getClass());
|
|
|
|
Integer[] elements = new Integer[SIZE];
|
|
for (int i = 0; i < SIZE; i++)
|
|
elements[i] = i;
|
|
shuffle(elements);
|
|
Collection<Integer> full = populatedList(elements);
|
|
|
|
assertTrue(Arrays.equals(elements, full.toArray()));
|
|
assertSame(Object[].class, full.toArray().getClass());
|
|
}
|
|
|
|
/**
|
|
* toArray(Integer array) returns an Integer array containing all
|
|
* elements from the list in insertion order
|
|
*/
|
|
public void testToArray2() {
|
|
Collection empty = new CopyOnWriteArrayList();
|
|
Integer[] a;
|
|
|
|
a = new Integer[0];
|
|
assertSame(a, empty.toArray(a));
|
|
|
|
a = new Integer[SIZE / 2];
|
|
Arrays.fill(a, 42);
|
|
assertSame(a, empty.toArray(a));
|
|
assertNull(a[0]);
|
|
for (int i = 1; i < a.length; i++)
|
|
assertEquals(42, (int) a[i]);
|
|
|
|
Integer[] elements = new Integer[SIZE];
|
|
for (int i = 0; i < SIZE; i++)
|
|
elements[i] = i;
|
|
shuffle(elements);
|
|
Collection<Integer> full = populatedList(elements);
|
|
|
|
Arrays.fill(a, 42);
|
|
assertTrue(Arrays.equals(elements, full.toArray(a)));
|
|
for (int i = 0; i < a.length; i++)
|
|
assertEquals(42, (int) a[i]);
|
|
assertSame(Integer[].class, full.toArray(a).getClass());
|
|
|
|
a = new Integer[SIZE];
|
|
Arrays.fill(a, 42);
|
|
assertSame(a, full.toArray(a));
|
|
assertTrue(Arrays.equals(elements, a));
|
|
|
|
a = new Integer[2 * SIZE];
|
|
Arrays.fill(a, 42);
|
|
assertSame(a, full.toArray(a));
|
|
assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
|
|
assertNull(a[SIZE]);
|
|
for (int i = SIZE + 1; i < a.length; i++)
|
|
assertEquals(42, (int) a[i]);
|
|
}
|
|
|
|
/**
|
|
* sublists contains elements at indexes offset from their base
|
|
*/
|
|
public void testSubList() {
|
|
List a = populatedList(10);
|
|
assertTrue(a.subList(1,1).isEmpty());
|
|
for (int j = 0; j < 9; ++j) {
|
|
for (int i = j ; i < 10; ++i) {
|
|
List b = a.subList(j,i);
|
|
for (int k = j; k < i; ++k) {
|
|
assertEquals(new Integer(k), b.get(k-j));
|
|
}
|
|
}
|
|
}
|
|
|
|
List s = a.subList(2, 5);
|
|
assertEquals(3, s.size());
|
|
s.set(2, m1);
|
|
assertEquals(a.get(4), m1);
|
|
s.clear();
|
|
assertEquals(7, a.size());
|
|
|
|
assertThrows(
|
|
IndexOutOfBoundsException.class,
|
|
() -> s.get(0),
|
|
() -> s.set(0, 42));
|
|
}
|
|
|
|
// Exception tests
|
|
|
|
/**
|
|
* toArray throws an ArrayStoreException when the given array
|
|
* can not store the objects inside the list
|
|
*/
|
|
public void testToArray_ArrayStoreException() {
|
|
List list = new CopyOnWriteArrayList();
|
|
// Integers are not auto-converted to Longs
|
|
list.add(86);
|
|
list.add(99);
|
|
assertThrows(
|
|
ArrayStoreException.class,
|
|
() -> list.toArray(new Long[0]),
|
|
() -> list.toArray(new Long[5]));
|
|
}
|
|
|
|
void testIndexOutOfBoundsException(List list) {
|
|
int size = list.size();
|
|
assertThrows(
|
|
IndexOutOfBoundsException.class,
|
|
() -> list.get(-1),
|
|
() -> list.get(size),
|
|
() -> list.set(-1, "qwerty"),
|
|
() -> list.set(size, "qwerty"),
|
|
() -> list.add(-1, "qwerty"),
|
|
() -> list.add(size + 1, "qwerty"),
|
|
() -> list.remove(-1),
|
|
() -> list.remove(size),
|
|
() -> list.addAll(-1, Collections.emptyList()),
|
|
() -> list.addAll(size + 1, Collections.emptyList()),
|
|
() -> list.listIterator(-1),
|
|
() -> list.listIterator(size + 1),
|
|
() -> list.subList(-1, size),
|
|
() -> list.subList(0, size + 1));
|
|
|
|
// Conversely, operations that must not throw
|
|
list.addAll(0, Collections.emptyList());
|
|
list.addAll(size, Collections.emptyList());
|
|
list.add(0, "qwerty");
|
|
list.add(list.size(), "qwerty");
|
|
list.get(0);
|
|
list.get(list.size() - 1);
|
|
list.set(0, "azerty");
|
|
list.set(list.size() - 1, "azerty");
|
|
list.listIterator(0);
|
|
list.listIterator(list.size());
|
|
list.subList(0, list.size());
|
|
list.remove(list.size() - 1);
|
|
}
|
|
|
|
/**
|
|
* IndexOutOfBoundsException is thrown when specified
|
|
*/
|
|
public void testIndexOutOfBoundsException() {
|
|
ThreadLocalRandom rnd = ThreadLocalRandom.current();
|
|
List x = populatedList(rnd.nextInt(5));
|
|
testIndexOutOfBoundsException(x);
|
|
|
|
int start = rnd.nextInt(x.size() + 1);
|
|
int end = rnd.nextInt(start, x.size() + 1);
|
|
assertThrows(
|
|
IndexOutOfBoundsException.class,
|
|
() -> x.subList(start, start - 1));
|
|
List subList = x.subList(start, end);
|
|
testIndexOutOfBoundsException(x);
|
|
}
|
|
|
|
/**
|
|
* a deserialized/reserialized list equals original
|
|
*/
|
|
public void testSerialization() throws Exception {
|
|
List x = populatedList(SIZE);
|
|
List y = serialClone(x);
|
|
|
|
assertNotSame(x, y);
|
|
assertEquals(x.size(), y.size());
|
|
assertEquals(x.toString(), y.toString());
|
|
assertTrue(Arrays.equals(x.toArray(), y.toArray()));
|
|
assertEquals(x, y);
|
|
assertEquals(y, x);
|
|
while (!x.isEmpty()) {
|
|
assertFalse(y.isEmpty());
|
|
assertEquals(x.remove(0), y.remove(0));
|
|
}
|
|
assertTrue(y.isEmpty());
|
|
}
|
|
|
|
}
|