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/**
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* Copyright (C) 2018 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.compare;
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import java.util.Comparator;
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/**
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* @author k.luther
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* @since 07.12.2018
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*/
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public class OrderIndexComparator implements Comparator<Integer> {
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private static OrderIndexComparator instance;
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public static OrderIndexComparator instance(){
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if(instance == null){
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instance = new OrderIndexComparator();
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}
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return instance;
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}
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@Override
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public int compare(Integer orderIndex1, Integer orderIndex2) {
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if (orderIndex1 == orderIndex2){
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return 0;
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}
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if (orderIndex1 == null){
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return 1;
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}
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if (orderIndex2 == null){
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return -1;
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}
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if (orderIndex1<orderIndex2){
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return -1;
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}else{
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return 1;
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}
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}
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}
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