1/*
2 * Copyright (c) 2006, 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 6467933
27 * @summary Test proper handling of comparators permitting nulls
28 * @author Martin Buchholz
29 */
30
31import java.util.*;
32import java.util.concurrent.*;
33import java.util.concurrent.atomic.*;
34import java.lang.reflect.*;
35
36@SuppressWarnings("unchecked")
37public class NullPermissiveComparator {
38
39    static void equal(Map m, String s) {
40        equal(m.toString(), s);
41    }
42
43    static void realMain(String[] args) throws Throwable {
44        final Comparator nullLow = new Comparator() {
45                public int compare(Object x, Object y) {
46                    return x == y ?  0 :
47                        x == null ? -1 :
48                        y == null ?  1 :
49                        ((Comparable)x).compareTo(y); }};
50
51        final Comparator nullHigh = new Comparator() {
52                public int compare(Object x, Object y) {
53                    return x == y ?  0 :
54                        x == null ?  1 :
55                        y == null ? -1 :
56                        ((Comparable)x).compareTo(y); }};
57
58        TreeMap m = new TreeMap(nullLow);
59
60        m.put("a", "A");
61        m.put("b", "B");
62        m.put("c", "C");
63
64        equal(m, "{a=A, b=B, c=C}");
65        equal(m.headMap("b"), "{a=A}");
66        equal(m.tailMap("b"), "{b=B, c=C}");
67        equal(m.headMap(null), "{}");
68        equal(m.tailMap(null), "{a=A, b=B, c=C}");
69
70        m.put(null, "NULL");
71
72        equal(m, "{null=NULL, a=A, b=B, c=C}");
73        equal(m.headMap("b"), "{null=NULL, a=A}");
74        equal(m.tailMap("b"), "{b=B, c=C}");
75        equal(m.headMap(null), "{}");
76        equal(m.tailMap(null), "{null=NULL, a=A, b=B, c=C}");
77
78        m = new TreeMap(nullHigh);
79
80        m.put("a", "A");
81        m.put("b", "B");
82        m.put("c", "C");
83
84        equal(m, "{a=A, b=B, c=C}");
85        equal(m.headMap("b"), "{a=A}");
86        equal(m.tailMap("b"), "{b=B, c=C}");
87        equal(m.headMap(null), "{a=A, b=B, c=C}");
88        equal(m.tailMap(null), "{}");
89
90        m.put(null, "NULL");
91
92        equal(m, "{a=A, b=B, c=C, null=NULL}");
93        equal(m.headMap("b"), "{a=A}");
94        equal(m.tailMap("b"), "{b=B, c=C, null=NULL}");
95        equal(m.headMap(null), "{a=A, b=B, c=C}");
96        equal(m.tailMap(null), "{null=NULL}");
97    }
98
99    //--------------------- Infrastructure ---------------------------
100    static volatile int passed = 0, failed = 0;
101    static void pass() {passed++;}
102    static void fail() {failed++; Thread.dumpStack();}
103    static void fail(String msg) {System.out.println(msg); fail();}
104    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
105    static void check(boolean cond) {if (cond) pass(); else fail();}
106    static void equal(Object x, Object y) {
107        if (x == null ? y == null : x.equals(y)) pass();
108        else fail(x + " not equal to " + y);}
109    public static void main(String[] args) throws Throwable {
110        try {realMain(args);} catch (Throwable t) {unexpected(t);}
111        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
112        if (failed > 0) throw new AssertionError("Some tests failed");}
113}
114