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 
  24 package jdk.test.lib.util;
  25 
  26 import java.util.Objects;
  27 
  28 /**
  29  * Pair - a two element tuple
  30  *
  31  * @param <F> first type
  32  * @param <S> second type
  33  */
  34 public 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 }