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


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
12 package org.eclipse.ui.internal.dialogs;
13
14 import org.eclipse.jface.viewers.IBasicPropertyConstants;
15 import org.eclipse.jface.viewers.ViewerSorter;
16 import org.eclipse.ui.internal.registry.WizardsRegistryReader;
17
18 /**
19  * A Viewer element sorter that sorts Elements by their name attribute.
20  * Note that capitalization differences are not considered by this
21  * sorter, so a < B < c.
22  *
23  * NOTE exceptions to the above: an element with the system's reserved
24  * category for Other Wizards will always be sorted such that it will
25  * ultimately be placed at the end of the sorted result, and an elemen
26  * with the reserved category name for General wizards will always be
27  * placed at the beginning of the sorted result.
28  *
29  * @since 3.2
30  */
31 class DataTransferWizardCollectionSorter extends ViewerSorter {
32     /**
33      * Static instance of this class.
34      */
35     public final static DataTransferWizardCollectionSorter INSTANCE = new DataTransferWizardCollectionSorter();
36
37     /**
38      * Creates an instance of <code>DataTransferWizardCollectionSorter</code>. Since this
39      * is a stateless sorter, it is only accessible as a singleton; the private
40      * visibility of this constructor ensures this.
41      */
42     private DataTransferWizardCollectionSorter() {
43         super();
44     }
45
46     public int category(Object JavaDoc element) {
47         if (element instanceof WizardCollectionElement){
48             String JavaDoc id = ((WizardCollectionElement)element).getId();
49             if (WizardsRegistryReader.GENERAL_WIZARD_CATEGORY.equals(id)) {
50                 return 1;
51             }
52             if (WizardsRegistryReader.UNCATEGORIZED_WIZARD_CATEGORY.equals(id)) {
53                 return 3;
54             }
55             return 2;
56         }
57         return super.category(element);
58     }
59
60     /**
61      * Return true if this sorter is affected by a property
62      * change of propertyName on the specified element.
63      */
64     public boolean isSorterProperty(Object JavaDoc object, String JavaDoc propertyId) {
65         return propertyId.equals(IBasicPropertyConstants.P_TEXT);
66     }
67 }
68
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