eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/model/DefaultTermComparator.java

   1 /**
   2 * Copyright (C) 2009 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.taxeditor.model;
  10
  11 import java.util.Comparator;
  12
  13 import eu.etaxonomy.cdm.model.common.DefinedTermBase;
  14 import eu.etaxonomy.taxeditor.store.CdmStore;
  15
  16 /**
  17  * Implements a {@link Comparator} for {@link DefinedTermBase} objects based on the term's label.
  18  * The compare algorithm compares a term's label. Example: If used on an unsorted list of terms, the
  19  * list will be alphabetically  sorted by label afterwards.
  20  *
  21  * @author n.hoffmann
  22  * @date Jan 18, 2012
  23  *
  24  */
  25 public class DefaultTermComparator<T extends DefinedTermBase> implements Comparator<T> {
  26         @Override
  27         public int compare(T o1, T o2) {
  28                 if (o1 == o2){
  29                         return 0;
  30                 }
  31                 if (o1 == null){
  32                         return -1;
  33                 }
  34                 if (o2 == null){
  35                         return 1;
  36                 }
  37                 String label1 = o1.getLabel(CdmStore.getDefaultLanguage()) != null ? o1.getLabel(CdmStore.getDefaultLanguage()) : o1.getTitleCache();
  38                 String label2 = o2.getLabel(CdmStore.getDefaultLanguage()) != null ? o2.getLabel(CdmStore.getDefaultLanguage()) : o2.getTitleCache();
  39                 int result = label1.compareTo(label2);
  40                 if (result == 0){
  41                     return o1.getUuid().compareTo(o2.getUuid());
  42                 }
  43                 return result;
  44         }
  45 };