| /* |
| * Copyright (C) 2008, Charles O'Farrell <charleso@charleso.org> |
| * Copyright (C) 2010, Google Inc. |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| 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()); |
| } |
| } |