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/*
* 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());
}
}
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