1 /*
2 * Copyright (C) 2008, Charles O'Farrell <charleso@charleso.org>
3 * Copyright (C) 2010, Google Inc. and others
4 *
5 * This program and the accompanying materials are made available under the
6 * terms of the Eclipse Distribution License v. 1.0 which is available at
7 * https://www.eclipse.org/org/documents/edl-v10.php.
8 *
9 * SPDX-License-Identifier: BSD-3-Clause
10 */
11
12 package org.eclipse.jgit.lib;
13
14 import java.util.ArrayList;
15 import java.util.Collection;
16 import java.util.Collections;
17 import java.util.Comparator;
18 import java.util.List;
19
20 /**
21 * Util for sorting (or comparing) Ref instances by name.
22 * <p>
23 * Useful for command line tools or writing out refs to file.
24 */
25 public class RefComparator implements Comparator<Ref> {
26
27 /** Singleton instance of RefComparator */
28 public static final RefComparatorml#RefComparator">RefComparator INSTANCE = new RefComparator();
29
30 /** {@inheritDoc} */
31 @Override
32 public int compare(Reff" href="../../../../org/eclipse/jgit/lib/Ref.html#Ref">Ref o1, Ref o2) {
33 return compareTo(o1, o2);
34 }
35
36 /**
37 * Sorts the collection of refs, returning a new collection.
38 *
39 * @param refs
40 * collection to be sorted
41 * @return sorted collection of refs
42 */
43 public static Collection<Ref> sort(Collection<Ref> refs) {
44 final List<Ref> r = new ArrayList<>(refs);
45 Collections.sort(r, INSTANCE);
46 return r;
47 }
48
49 /**
50 * Compare a reference to a name.
51 *
52 * @param o1
53 * the reference instance.
54 * @param o2
55 * the name to compare to.
56 * @return standard Comparator result of < 0, 0, > 0.
57 */
58 public static int compareTo(Ref o1, String o2) {
59 return o1.getName().compareTo(o2);
60 }
61
62 /**
63 * Compare two references by name.
64 *
65 * @param o1
66 * the reference instance.
67 * @param o2
68 * the other reference instance.
69 * @return standard Comparator result of < 0, 0, > 0.
70 */
71 public static int compareTo(Reff" href="../../../../org/eclipse/jgit/lib/Ref.html#Ref">Ref o1, Ref o2) {
72 return o1.getName().compareTo(o2.getName());
73 }
74 }