ChangeElementContentProvider


1   /*******************************************************************************
2    * Copyright (c) 2000, 2005 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.ltk.internal.ui.refactoring;
12  
13  import org.eclipse.jface.viewers.ITreeContentProvider;
14  import org.eclipse.jface.viewers.Viewer;
15  
16  /**
17   * A default content provider to present a hierarchy of <code>IChange</code>
18   * objects in a tree viewer.
19   */
20  class ChangeElementContentProvider  implements ITreeContentProvider {
21      
22      /* non Java-doc
23       * @see ITreeContentProvider#inputChanged
24       */
25      public void inputChanged(Viewer viewer, Object   oldInput, Object   newInput) {
26          // do nothing
27      }
28      
29      /* non Java-doc
30       * @see ITreeContentProvider#getChildren
31       */
32      public Object  [] getChildren(Object   o) {
33          PreviewNode element= (PreviewNode)o;
34          return element.getChildren();
35      }
36      
37      /* non Java-doc
38       * @see ITreeContentProvider#getParent
39       */
40      public Object   getParent(Object   element){
41          return ((PreviewNode)element).getParent();
42      }
43      
44      /* non Java-doc
45       * @see ITreeContentProvider#hasChildren
46       */
47      public boolean hasChildren(Object   element){
48          Object  [] children= getChildren(element);
49          return children != null && children.length > 0;
50      }
51      
52      /* non Java-doc
53       * @see ITreeContentProvider#dispose
54       */
55      public void dispose(){
56      }
57      
58      /* non Java-doc
59       * @see ITreeContentProvider#getElements
60       */
61      public Object  [] getElements(Object   element){
62          return getChildren(element);
63      }   
64  }
65
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