| /* |
| * 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.slider.common.tools; |
| |
| import java.io.Serializable; |
| import java.util.Comparator; |
| |
| public class Comparators { |
| |
| public static class LongComparator implements Comparator<Long>, Serializable { |
| @Override |
| public int compare(Long o1, Long o2) { |
| long result = o1 - o2; |
| // need to comparisons with a diff greater than integer size |
| if (result < 0 ) { |
| return -1; |
| } else if (result >0) { |
| return 1; |
| } |
| return 0; |
| } |
| } |
| |
| /** |
| * Little template class to reverse any comparitor |
| * @param <CompareType> the type that is being compared |
| */ |
| public static class ComparatorReverser<CompareType> implements Comparator<CompareType>, |
| Serializable { |
| |
| final Comparator<CompareType> instance; |
| |
| public ComparatorReverser(Comparator<CompareType> instance) { |
| this.instance = instance; |
| } |
| |
| @Override |
| public int compare(CompareType first, CompareType second) { |
| return instance.compare(second, first); |
| } |
| } |
| } |