1/*
2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 4593209 8001667
27 * @summary Reverse comparator was subtly broken
28 * @author Josh Bloch
29 */
30
31import java.util.*;
32import java.io.*;
33
34public class ReverseOrder {
35    static byte[] serialBytes(Object o) {
36        try {
37            ByteArrayOutputStream bos = new ByteArrayOutputStream();
38            ObjectOutputStream oos = new ObjectOutputStream(bos);
39            oos.writeObject(o);
40            oos.flush();
41            oos.close();
42            return bos.toByteArray();
43        } catch (Throwable t) {
44            throw new Error(t);
45        }
46    }
47
48    @SuppressWarnings("unchecked")
49    static <T> T serialClone(T o) {
50        try {
51            ObjectInputStream ois = new ObjectInputStream
52                (new ByteArrayInputStream(serialBytes(o)));
53            T clone = (T) ois.readObject();
54            return clone;
55        } catch (Throwable t) {
56            throw new Error(t);
57        }
58    }
59
60    public static void main(String[] args) throws Exception {
61        Foo[] a = { new Foo(2), new Foo(3), new Foo(1) };
62        List list = Arrays.asList(a);
63        Comparator cmp = Collections.reverseOrder();
64        Collections.sort(list, cmp);
65
66        Foo[] golden = { new Foo(3), new Foo(2), new Foo(1) };
67        List goldenList = Arrays.asList(golden);
68        if (!list.equals(goldenList))
69            throw new Exception(list.toString());
70
71        Comparator clone = serialClone(cmp);
72        List list2 = Arrays.asList(a);
73        Collections.sort(list2, clone);
74        if (!list2.equals(goldenList))
75            throw new Exception(list.toString());
76    }
77}
78
79class Foo implements Comparable {
80    int val;
81    Foo(int i) { val = i; }
82
83    public int compareTo(Object o) {
84        Foo f = (Foo)o;
85        return (val < f.val ? Integer.MIN_VALUE : (val == f.val ? 0 : 1));
86    }
87
88    public boolean equals(Object o) {
89        return o instanceof Foo && ((Foo)o).val == val;
90    }
91
92    public int hashCode()    { return val; }
93
94    public String toString() { return Integer.toString(val); }
95}
96