PreferenceNodeFilter


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  package org.eclipse.ui.internal.dialogs;
12  
13  import java.util.Collection  ;
14  import java.util.HashSet  ;
15  
16  import org.eclipse.jface.preference.IPreferenceNode;
17  import org.eclipse.jface.viewers.Viewer;
18  import org.eclipse.jface.viewers.ViewerFilter;
19  
20  /**
21   * The PreferenceNodeFilter is a filter that only matches
22   * a set of ids.
23   */
24  public class PreferenceNodeFilter extends ViewerFilter {
25  
26      Collection   ids = new HashSet  ();
27  
28      /**
29       * Create a new instance of the receiver on a
30       * list of filteredIds.
31       * @param filteredIds The collection of ids that
32       * will be shown.
33       */
34      public PreferenceNodeFilter(String  [] filteredIds) {
35          super();
36          for (int i = 0; i < filteredIds.length; i++) {
37              ids.add(filteredIds[i]);
38          }
39      }
40  
41      /* (non-Javadoc)
42       * @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
43       */
44      public boolean select(Viewer viewer, Object   parentElement, Object   element) {
45          return checkNodeAndChildren((IPreferenceNode) element);
46      }
47  
48      /**
49       * Check to see if the node or any of its children 
50       * have an id in the ids.
51       * @param node WorkbenchPreferenceNode
52       * @return boolean <code>true</code> if node or oe of its children
53       * has an id in the ids.
54       */
55      private boolean checkNodeAndChildren(IPreferenceNode node) {
56          if(ids.contains(node.getId())) {
57              return true;
58          }
59          
60          IPreferenceNode[] subNodes = node.getSubNodes();
61          for (int i = 0; i < subNodes.length; i++) {
62              if(checkNodeAndChildren(subNodes[i])) {
63                  return true;
64              }
65              
66          }
67          return false;
68      }
69  
70  }
71
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