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// $Id$
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/**
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* Copyright (C) 2016 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.api.service;
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import java.util.Comparator;
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import eu.etaxonomy.cdm.model.common.ITreeNode;
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/**
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* @author a.mueller
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* @date 05.07.2016
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*
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* Comparator for treeindexes.
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* Compares the tree indexes node by node, sorted by node number.
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* If one index is shorter than the other one but
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*/
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public class TreeIndexComparator implements Comparator<String>{
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@Override
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public int compare(String treeIndex1, String treeIndex2) {
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if (treeIndex1 == null && treeIndex2 == null){
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return 0;
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}else if (treeIndex1 == null){
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return -1;
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}else if (treeIndex2 == null){
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return 1;
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}
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if (treeIndex1.equals(treeIndex2)){
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return 0;
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}
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String[] splits1 = treeIndex1.split(ITreeNode.separator);
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String[] splits2 = treeIndex2.split(ITreeNode.separator);
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for (int i=0; i < splits1.length; i++){
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if (splits2.length <= i){
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return 1;
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}
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int c = splits1[i].compareTo(splits2[i]);
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if (c != 0){
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return c;
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}
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}
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return -1;
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}
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}
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