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Java > Open Source Codes > org > eclipse > jdt > internal > ui > wizards > TypedViewerFilter


1 /*******************************************************************************
2  * Copyright (c) 2000, 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.jdt.internal.ui.wizards;
12
13 import org.eclipse.core.runtime.Assert;
14
15 import org.eclipse.jface.viewers.Viewer;
16 import org.eclipse.jface.viewers.ViewerFilter;
17
18 /**
19  * Viewer filter used in selection dialogs.
20  */

21 public class TypedViewerFilter extends ViewerFilter {
22
23     private Class JavaDoc[] fAcceptedTypes;
24     private Object JavaDoc[] fRejectedElements;
25
26     /**
27      * Creates a filter that only allows elements of gives types.
28      * @param acceptedTypes The types of accepted elements
29      */

30     public TypedViewerFilter(Class JavaDoc[] acceptedTypes) {
31         this(acceptedTypes, null);
32     }
33
34     /**
35      * Creates a filter that only allows elements of gives types, but not from a
36      * list of rejected elements.
37      * @param acceptedTypes Accepted elements must be of this types
38      * @param rejectedElements Element equals to the rejected elements are
39      * filtered out
40      */

41     public TypedViewerFilter(Class JavaDoc[] acceptedTypes, Object JavaDoc[] rejectedElements) {
42         Assert.isNotNull(acceptedTypes);
43         fAcceptedTypes= acceptedTypes;
44         fRejectedElements= rejectedElements;
45     }
46
47     /**
48      * @see ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
49      */

50     public boolean select(Viewer viewer, Object JavaDoc parentElement, Object JavaDoc element) {
51         if (fRejectedElements != null) {
52             for (int i= 0; i < fRejectedElements.length; i++) {
53                 if (element.equals(fRejectedElements[i])) {
54                     return false;
55                 }
56             }
57         }
58         for (int i= 0; i < fAcceptedTypes.length; i++) {
59             if (fAcceptedTypes[i].isInstance(element)) {
60                 return true;
61             }
62         }
63         return false;
64     }
65
66 }
67
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