eu.etaxonomy.taxeditor.navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/key/polytomous/PolytomousKeyContentProvider.java

   1 /**
   2  *
   3  */
   4 package eu.etaxonomy.taxeditor.navigation.key.polytomous;
   5
   6 import java.util.Collections;
   7 import java.util.Comparator;
   8 import java.util.List;
   9
  10 import org.eclipse.jface.viewers.IStructuredContentProvider;
  11 import org.eclipse.jface.viewers.Viewer;
  12
  13 /**
  14  * @author n.hoffmann
  15  *
  16  */
  17 public class PolytomousKeyContentProvider implements IStructuredContentProvider{
  18
  19         @Override
  20         public void dispose() {
  21
  22         }
  23
  24         @Override
  25         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  26
  27         }
  28
  29         @Override
  30         public Object[] getElements(Object inputElement) {
  31                 if(inputElement instanceof List){
  32
  33                         Collections.sort((List)inputElement,new PolytomousKeyComparator());
  34                         return ((List) inputElement).toArray();
  35                 }
  36                 return null;
  37         }
  38
  39         public class PolytomousKeyComparator implements Comparator<Object> {
  40
  41                 @Override
  42                 public int compare(Object o1, Object o2) {
  43                         if(o1 == null && o2 == null) {
  44                                 return 0;
  45                         } else if (o1 == null) {
  46                                 return -1;
  47                         } else if(o2 == null) {
  48                                 return +1;
  49                         } else {
  50                                 return o1.toString().compareTo(o2.toString());
  51                         }
  52                 }
  53
  54         }
  55
  56 }