Pair.java revision 2224:2a8815d86b93 
1/*
2 * Copyright (c) 2015, 2016, 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
24package jdk.test.lib.util;
25
26import java.util.Objects;
27
28/**
29 * Pair - a two element tuple
30 *
31 * @param <F> first type
32 * @param <S> second type
33 */
34public class Pair<F, S> {
35    public final F first;
36    public final S second;
37
38    public Pair(F first, S second) {
39        this.first = first;
40        this.second = second;
41    }
42
43    @Override
44    public String toString() {
45        return "(" + first + ":" + second + ")";
46    }
47
48    @Override
49    public boolean equals(Object other) {
50        if (other instanceof Pair<?, ?>) {
51            Pair<?, ?> otherPair = (Pair<?, ?>) other;
52            return Objects.equals(first, otherPair.first) &&
53                    Objects.equals(second, otherPair.second);
54        }
55        return false;
56    }
57
58    @Override
59    public int hashCode() {
60        if (first == null) {
61            return (second == null) ? 0 : second.hashCode();
62        } else if (second == null) {
63            return first.hashCode();
64        } else {
65            return first.hashCode() * 17 + second.hashCode();
66        }
67    }
68}
69