NodeElementComparer.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.jcr;
  17
  18 import javax.jcr.Node;
  19 import javax.jcr.RepositoryException;
  20
  21 import org.argeo.ArgeoException;
  22 import org.eclipse.jface.viewers.IElementComparer;
  23
  24 /** Element comparer for JCR node, to be used in JFace viewers. */
  25 public class NodeElementComparer implements IElementComparer {
  26
  27         public boolean equals(Object a, Object b) {
  28                 try {
  29                         if ((a instanceof Node) && (b instanceof Node)) {
  30                                 Node nodeA = (Node) a;
  31                                 Node nodeB = (Node) b;
  32                                 return nodeA.getIdentifier().equals(nodeB.getIdentifier());
  33                         } else {
  34                                 return a.equals(b);
  35                         }
  36                 } catch (RepositoryException e) {
  37                         throw new ArgeoException("Cannot compare nodes", e);
  38                 }
  39         }
  40
  41         public int hashCode(Object element) {
  42                 try {
  43                         if (element instanceof Node)
  44                                 return ((Node) element).getIdentifier().hashCode();
  45                         return element.hashCode();
  46                 } catch (RepositoryException e) {
  47                         throw new ArgeoException("Cannot get hash code", e);
  48                 }
  49         }
  50
  51 }