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- /*
- * 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();
-
- public int compare(final Ref o1, final 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(final Collection<Ref> refs) {
- final List<Ref> r = new ArrayList<Ref>(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(final Ref o1, final Ref o2) {
- return o1.getName().compareTo(o2.getName());
- }
- }
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