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Java > Open Source Codes > org > eclipse > ui > internal > dialogs > WizardTagFilter


1 /*******************************************************************************
2  * Copyright (c) 2004, 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 org.eclipse.jface.viewers.AbstractTreeViewer;
14 import org.eclipse.jface.viewers.ITreeContentProvider;
15 import org.eclipse.jface.viewers.Viewer;
16 import org.eclipse.jface.viewers.ViewerFilter;
17 import org.eclipse.ui.wizards.IWizardDescriptor;
18
19 /**
20  * A viewer filter that will exclude all IWizardDescriptors that do not have at
21  * least one tag in a provided set.
22  *
23  * @since 3.1
24  */
25 public class WizardTagFilter extends ViewerFilter {
26
27     private String JavaDoc [] myTags;
28     
29     /**
30      * Create a new instance of this filter
31      * @param tags the wizard tags to allow
32      */
33     public WizardTagFilter(String JavaDoc [] tags) {
34         myTags = tags;
35     }
36     
37     /* (non-Javadoc)
38      * @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
39      */
40     public boolean select(Viewer viewer, Object JavaDoc parentElement, Object JavaDoc element) {
41         if (element instanceof IWizardDescriptor) {
42             IWizardDescriptor desc = (IWizardDescriptor)element;
43             String JavaDoc [] tags = desc.getTags();
44             for (int i = 0; i < tags.length; i++) {
45                 for (int j = 0; j < myTags.length; j++) {
46                     if (tags[i].equals(myTags[j])) {
47                         return true;
48                     }
49                 }
50             }
51             return false;
52         }
53         Object JavaDoc[] children = ((ITreeContentProvider) ((AbstractTreeViewer) viewer)
54                 .getContentProvider()).getChildren(element);
55         if (children.length > 0) {
56             return filter(viewer, element, children).length > 0;
57         }
58
59         return false;
60     }
61 }
62
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