TreeContentProvider


1   /*******************************************************************************
2    * Copyright (c) 2005, 2006 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  
12  package org.eclipse.ui.internal.cheatsheets.composite.explorer;
13  
14  import org.eclipse.jface.viewers.ITreeContentProvider;
15  import org.eclipse.jface.viewers.Viewer;
16  import org.eclipse.ui.internal.cheatsheets.composite.model.AbstractTask;
17  import org.eclipse.ui.internal.provisional.cheatsheets.ICompositeCheatSheet;
18  import org.eclipse.ui.internal.provisional.cheatsheets.ITaskGroup;
19  
20  class TreeContentProvider implements ITreeContentProvider {
21      public Object  [] getChildren(Object   parentElement) {
22          if (parentElement instanceof ICompositeCheatSheet) {
23              final Object  [] rootTask = {((ICompositeCheatSheet) parentElement).getRootTask()};
24              return rootTask;
25          }
26          if (parentElement instanceof ITaskGroup)
27              return ((ITaskGroup) parentElement).getSubtasks();
28          return new Object  [0];
29      }
30  
31      public Object   getParent(Object   element) {
32          if (element instanceof  AbstractTask) {
33              return ((AbstractTask)element).getParent();
34          }
35          return null;
36      }
37  
38      public boolean hasChildren(Object   element) {
39          if (element instanceof ICompositeCheatSheet)
40              return true;
41          if (element instanceof ITaskGroup)
42              return ((ITaskGroup) element).getSubtasks().length > 0;
43          return false;
44      }
45  
46      public Object  [] getElements(Object   inputElement) {
47          return getChildren(inputElement);
48      }
49  
50      public void dispose() {
51      }
52  
53      public void inputChanged(Viewer viewer, Object   oldInput, Object   newInput) {
54      }
55  }
56
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