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1 /*
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2 CCmI Editor - A Collaborative Cross-Modal Diagram Editing Tool
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3
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4 Copyright (C) 2011 Queen Mary University of London (http://ccmi.eecs.qmul.ac.uk/)
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation, either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19 package uk.ac.qmul.eecs.ccmi.diagrammodel;
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20
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21 import java.util.Comparator;
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22
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23 /**
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24 * A Comparator for diagram elements. The elements are ordered by their id.
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25 *
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26 * @see DiagramElement#getId()
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27 */
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28 public class DiagramElementComparator implements Comparator<DiagramElement> {
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29 public static DiagramElementComparator getInstance(){
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30 if(comparator == null)
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31 comparator = new DiagramElementComparator();
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32 return comparator;
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33 }
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34
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35 @Override
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36 public int compare(DiagramElement de1, DiagramElement de2) {
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37 if(de1.getId() == de2.getId())
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38 return 0;
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39 else if(de1.getId() < de2.getId())
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40 return -1;
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41 else
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42 return 1;
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43 }
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44
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45 private static DiagramElementComparator comparator;
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46 }
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