1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.tools;
|
---|
3 | import java.util.ArrayList;
|
---|
4 | import java.util.List;
|
---|
5 | import java.util.Objects;
|
---|
6 |
|
---|
7 | /**
|
---|
8 | * A pair of objects.
|
---|
9 | * @param <A> Type of first item
|
---|
10 | * @param <B> Type of second item
|
---|
11 | * @since 429
|
---|
12 | */
|
---|
13 | public final class Pair<A, B> {
|
---|
14 |
|
---|
15 | /**
|
---|
16 | * The first item
|
---|
17 | */
|
---|
18 | public A a;
|
---|
19 |
|
---|
20 | /**
|
---|
21 | * The second item
|
---|
22 | */
|
---|
23 | public B b;
|
---|
24 |
|
---|
25 | /**
|
---|
26 | * Constructs a new {@code Pair}.
|
---|
27 | * @param a The first item
|
---|
28 | * @param b The second item
|
---|
29 | */
|
---|
30 | public Pair(A a, B b) {
|
---|
31 | this.a = a;
|
---|
32 | this.b = b;
|
---|
33 | }
|
---|
34 |
|
---|
35 | @Override
|
---|
36 | public int hashCode() {
|
---|
37 | return Objects.hash(a, b);
|
---|
38 | }
|
---|
39 |
|
---|
40 | @Override
|
---|
41 | public boolean equals(Object other) {
|
---|
42 | if (this == other) return true;
|
---|
43 | if (other == null || getClass() != other.getClass()) return false;
|
---|
44 | Pair<?, ?> pair = (Pair<?, ?>) other;
|
---|
45 | return Objects.equals(a, pair.a) &&
|
---|
46 | Objects.equals(b, pair.b);
|
---|
47 | }
|
---|
48 |
|
---|
49 | public static <T> List<T> toList(Pair<T, T> p) {
|
---|
50 | List<T> l = new ArrayList<>(2);
|
---|
51 | l.add(p.a);
|
---|
52 | l.add(p.b);
|
---|
53 | return l;
|
---|
54 | }
|
---|
55 |
|
---|
56 | public static <T> Pair<T, T> sort(Pair<T, T> p) {
|
---|
57 | if (p.b.hashCode() < p.a.hashCode()) {
|
---|
58 | T tmp = p.a;
|
---|
59 | p.a = p.b;
|
---|
60 | p.b = tmp;
|
---|
61 | }
|
---|
62 | return p;
|
---|
63 | }
|
---|
64 |
|
---|
65 | @Override
|
---|
66 | public String toString() {
|
---|
67 | return "<"+a+','+b+'>';
|
---|
68 | }
|
---|
69 |
|
---|
70 | /**
|
---|
71 | * Convenient constructor method
|
---|
72 | * @param <U> type of first item
|
---|
73 | * @param <V> type of second item
|
---|
74 | * @param u The first item
|
---|
75 | * @param v The second item
|
---|
76 | * @return The newly created Pair(u,v)
|
---|
77 | */
|
---|
78 | public static <U, V> Pair<U, V> create(U u, V v) {
|
---|
79 | return new Pair<>(u, v);
|
---|
80 | }
|
---|
81 | }
|
---|