RowViewerComparator.java

   1 package org.argeo.eclipse.ui.jcr.lists;
   2
   3 import javax.jcr.Node;
   4 import javax.jcr.RepositoryException;
   5 import javax.jcr.query.Row;
   6
   7 import org.argeo.ArgeoException;
   8 import org.eclipse.jface.viewers.Viewer;
   9
  10 /**
  11  * Base comparator to enable ordering on Table or Tree viewer that display Jcr
  12  * rows
  13  */
  14 public class RowViewerComparator extends NodeViewerComparator {
  15
  16         protected String selectorName;
  17
  18         public RowViewerComparator() {
  19         }
  20
  21         /**
  22          * e1 and e2 must both be Jcr rows.
  23          *
  24          * @param viewer
  25          * @param e1
  26          * @param e2
  27          * @return
  28          */
  29         @Override
  30         public int compare(Viewer viewer, Object e1, Object e2) {
  31                 try {
  32                         Node n1 = ((Row) e1).getNode(selectorName);
  33                         Node n2 = ((Row) e2).getNode(selectorName);
  34                         return super.compare(viewer, n1, n2);
  35                 } catch (RepositoryException re) {
  36                         throw new ArgeoException("Unexpected error "
  37                                         + "while comparing nodes", re);
  38                 }
  39         }
  40
  41         /**
  42          * @param propertyType
  43          *            Corresponding JCR type
  44          * @param propertyName
  45          *            name of the property to use.
  46          */
  47         public void setColumn(int propertyType, String selectorName,
  48                         String propertyName) {
  49                 if (this.selectorName != null && getPropertyName() != null
  50                                 && this.selectorName.equals(selectorName)
  51                                 && this.getPropertyName().equals(propertyName)) {
  52                         // Same column as last sort; toggle the direction
  53                         setDirection(1 - getDirection());
  54                 } else {
  55                         // New column; do a descending sort
  56                         setPropertyType(propertyType);
  57                         setPropertyName(propertyName);
  58                         this.selectorName = selectorName;
  59                         setDirection(NodeViewerComparator.ASCENDING);
  60                 }
  61         }
  62 }