Pair.java revision dd910c5945272e9820dfd9d7798ba32aa7dfc73f 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.signapk;
18
19/**
20 * Pair of two elements.
21 */
22public final class Pair<A, B> {
23    private final A mFirst;
24    private final B mSecond;
25
26    private Pair(A first, B second) {
27        mFirst = first;
28        mSecond = second;
29    }
30
31    public static <A, B> Pair<A, B> create(A first, B second) {
32        return new Pair<A, B>(first, second);
33    }
34
35    public A getFirst() {
36        return mFirst;
37    }
38
39    public B getSecond() {
40        return mSecond;
41    }
42
43    @Override
44    public int hashCode() {
45        final int prime = 31;
46        int result = 1;
47        result = prime * result + ((mFirst == null) ? 0 : mFirst.hashCode());
48        result = prime * result + ((mSecond == null) ? 0 : mSecond.hashCode());
49        return result;
50    }
51
52    @Override
53    public boolean equals(Object obj) {
54        if (this == obj) {
55            return true;
56        }
57        if (obj == null) {
58            return false;
59        }
60        if (getClass() != obj.getClass()) {
61            return false;
62        }
63        @SuppressWarnings("rawtypes")
64        Pair other = (Pair) obj;
65        if (mFirst == null) {
66            if (other.mFirst != null) {
67                return false;
68            }
69        } else if (!mFirst.equals(other.mFirst)) {
70            return false;
71        }
72        if (mSecond == null) {
73            if (other.mSecond != null) {
74                return false;
75            }
76        } else if (!mSecond.equals(other.mSecond)) {
77            return false;
78        }
79        return true;
80    }
81}
82