1 /*
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3  *
4  * This code is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 2 only, as
6  * published by the Free Software Foundation.
7  *
8  * This code is distributed in the hope that it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
11  * version 2 for more details (a copy is included in the LICENSE file that
12  * accompanied this code).
13  *
14  * You should have received a copy of the GNU General Public License version
15  * 2 along with this work; if not, write to the Free Software Foundation,
16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17  *
18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19  * or visit www.oracle.com if you need additional information or have any
20  * questions.
21  */
22 
23 /*
24  * This file is available under and governed by the GNU General Public
25  * License version 2 only, as published by the Free Software Foundation.
26  * However, the following notice accompanied the original version of this
27  * file:
28  *
29  * Written by Doug Lea and Martin Buchholz with assistance from
30  * members of JCP JSR-166 Expert Group and released to the public
31  * domain, as explained at
32  * http://creativecommons.org/publicdomain/zero/1.0/
33  */
34 
35 import java.util.ArrayDeque;
36 import java.util.Collections;
37 import java.util.Spliterator;
38 
39 import junit.framework.Test;
40 
41 public class ArrayDeque8Test extends JSR166TestCase {
main(String[] args)42     public static void main(String[] args) {
43         main(suite(), args);
44     }
45 
suite()46     public static Test suite() {
47         return newTestSuite(ArrayDeque8Test.class);
48     }
49 
50     /**
51      * Spliterator.getComparator always throws IllegalStateException
52      */
testSpliterator_getComparator()53     public void testSpliterator_getComparator() {
54         assertThrows(IllegalStateException.class,
55                      () -> new ArrayDeque().spliterator().getComparator());
56     }
57 
58     /**
59      * Spliterator characteristics are as advertised
60      */
testSpliterator_characteristics()61     public void testSpliterator_characteristics() {
62         ArrayDeque q = new ArrayDeque();
63         Spliterator s = q.spliterator();
64         int characteristics = s.characteristics();
65         int required = Spliterator.NONNULL
66             | Spliterator.ORDERED
67             | Spliterator.SIZED
68             | Spliterator.SUBSIZED;
69         assertEquals(required, characteristics & required);
70         assertTrue(s.hasCharacteristics(required));
71         assertEquals(0, characteristics
72                      & (Spliterator.CONCURRENT
73                         | Spliterator.DISTINCT
74                         | Spliterator.IMMUTABLE
75                         | Spliterator.SORTED));
76     }
77 
78     /**
79      * Handle capacities near Integer.MAX_VALUE.
80      * ant -Dvmoptions='-Xms28g -Xmx28g' -Djsr166.expensiveTests=true -Djsr166.tckTestClass=ArrayDeque8Test -Djsr166.methodFilter=testHugeCapacity tck
81      */
testHugeCapacity()82     public void testHugeCapacity() {
83         if (! (testImplementationDetails
84                && expensiveTests
85                && Runtime.getRuntime().maxMemory() > 24L * (1 << 30)))
86             return;
87 
88         final Integer e = 42;
89         final int maxArraySize = Integer.MAX_VALUE - 8;
90 
91         assertThrows(OutOfMemoryError.class,
92                      () -> new ArrayDeque(Integer.MAX_VALUE));
93 
94         {
95             ArrayDeque q = new ArrayDeque(maxArraySize - 1);
96             assertEquals(0, q.size());
97             assertTrue(q.isEmpty());
98             q = null;
99         }
100 
101         {
102             ArrayDeque q = new ArrayDeque();
103             assertTrue(q.addAll(Collections.nCopies(maxArraySize - 3, e)));
104             assertEquals(e, q.peekFirst());
105             assertEquals(e, q.peekLast());
106             assertEquals(maxArraySize - 3, q.size());
107             q.addFirst((Integer) 0);
108             q.addLast((Integer) 1);
109             assertEquals((Integer) 0, q.peekFirst());
110             assertEquals((Integer) 1, q.peekLast());
111             assertEquals(maxArraySize - 1, q.size());
112 
113             ArrayDeque smallish = new ArrayDeque(
114                 Collections.nCopies(Integer.MAX_VALUE - q.size() + 1, e));
115             assertThrows(
116                 IllegalStateException.class,
117                 () -> q.addAll(q),
118                 () -> q.addAll(smallish),
119                 () -> smallish.addAll(q));
120         }
121     }
122 
123 }
124