jcr/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/NodeViewerComparer.java

   1 package org.argeo.eclipse.ui.jcr.util;
   2
   3 import javax.jcr.Node;
   4 import javax.jcr.RepositoryException;
   5
   6 import org.argeo.eclipse.ui.EclipseUiException;
   7 import org.eclipse.jface.viewers.IElementComparer;
   8
   9 /** Compare JCR nodes based on their JCR identifiers, for use in JFace viewers. */
  10 public class NodeViewerComparer implements IElementComparer {
  11
  12         // force comparison on Node IDs only.
  13         public boolean equals(Object elementA, Object elementB) {
  14                 if (!(elementA instanceof Node) || !(elementB instanceof Node)) {
  15                         return elementA == null ? elementB == null : elementA
  16                                         .equals(elementB);
  17                 } else {
  18
  19                         boolean result = false;
  20                         try {
  21                                 String idA = ((Node) elementA).getIdentifier();
  22                                 String idB = ((Node) elementB).getIdentifier();
  23                                 result = idA == null ? idB == null : idA.equals(idB);
  24                         } catch (RepositoryException re) {
  25                                 throw new EclipseUiException("cannot compare nodes", re);
  26                         }
  27
  28                         return result;
  29                 }
  30         }
  31
  32         public int hashCode(Object element) {
  33                 // TODO enhanced this method.
  34                 return element.getClass().toString().hashCode();
  35         }
  36 }