| /* |
| * Copyright (C) 2008, Charles O'Farrell <charleso@charleso.org> |
| * Copyright (C) 2010, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.lib; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| /** |
| * Util for sorting (or comparing) Ref instances by name. |
| * <p> |
| * Useful for command line tools or writing out refs to file. |
| */ |
| public class RefComparator implements Comparator<Ref> { |
| |
| /** Singleton instance of RefComparator */ |
| public static final RefComparator INSTANCE = new RefComparator(); |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int compare(Ref o1, Ref o2) { |
| return compareTo(o1, o2); |
| } |
| |
| /** |
| * Sorts the collection of refs, returning a new collection. |
| * |
| * @param refs |
| * collection to be sorted |
| * @return sorted collection of refs |
| */ |
| public static Collection<Ref> sort(Collection<Ref> refs) { |
| final List<Ref> r = new ArrayList<>(refs); |
| Collections.sort(r, INSTANCE); |
| return r; |
| } |
| |
| /** |
| * Compare a reference to a name. |
| * |
| * @param o1 |
| * the reference instance. |
| * @param o2 |
| * the name to compare to. |
| * @return standard Comparator result of < 0, 0, > 0. |
| */ |
| public static int compareTo(Ref o1, String o2) { |
| return o1.getName().compareTo(o2); |
| } |
| |
| /** |
| * Compare two references by name. |
| * |
| * @param o1 |
| * the reference instance. |
| * @param o2 |
| * the other reference instance. |
| * @return standard Comparator result of < 0, 0, > 0. |
| */ |
| public static int compareTo(Ref o1, Ref o2) { |
| return o1.getName().compareTo(o2.getName()); |
| } |
| } |