NodeElementComparer.java

   1 package org.argeo.eclipse.ui.jcr;
   2
   3 import javax.jcr.Node;
   4 import javax.jcr.RepositoryException;
   5
   6 import org.argeo.ArgeoException;
   7 import org.eclipse.jface.viewers.IElementComparer;
   8
   9 /** Element comparer for JCR node, to be used in JFace viewers. */
  10 public class NodeElementComparer implements IElementComparer {
  11
  12         public boolean equals(Object a, Object b) {
  13                 try {
  14                         if ((a instanceof Node) && (b instanceof Node)) {
  15                                 Node nodeA = (Node) a;
  16                                 Node nodeB = (Node) b;
  17                                 return nodeA.getIdentifier().equals(nodeB.getIdentifier());
  18                         } else {
  19                                 return a.equals(b);
  20                         }
  21                 } catch (RepositoryException e) {
  22                         throw new ArgeoException("Cannot compare nodes", e);
  23                 }
  24         }
  25
  26         public int hashCode(Object element) {
  27                 try {
  28                         if (element instanceof Node)
  29                                 return ((Node) element).getIdentifier().hashCode();
  30                         return element.hashCode();
  31                 } catch (RepositoryException e) {
  32                         throw new ArgeoException("Cannot get hash code", e);
  33                 }
  34         }
  35
  36 }