org.apache.jackrabbit.oak.plugins.document.StableRevisionComparator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.oak.plugins.document;
import java.util.Collections;
import java.util.Comparator;
/**
* StableRevisionComparator implements a revision comparator, which
* is only based on stable information available in the two revisions presented
* to this comparator. This class is used in sorted collections where
* revision keys must have a stable ordering independent from the time when
* a revision was seen.
*
* Revisions are first ordered by timestamp, then counter and finally cluster
* node id.
*/
public class StableRevisionComparator implements Comparator {
public static final Comparator INSTANCE = new StableRevisionComparator();
public static final Comparator REVERSE = Collections.reverseOrder(INSTANCE);
private StableRevisionComparator() {
}
@Override
public int compare(Revision o1, Revision o2) {
return o1.compareTo(o2);
}
}