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Java > Open Source Codes > org > eclipse > ui > views > navigator > FiltersContentProvider


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.ui.views.navigator;
12
13 import java.util.ArrayList JavaDoc;
14 import java.util.List JavaDoc;
15
16 import org.eclipse.core.runtime.IConfigurationElement;
17 import org.eclipse.core.runtime.IExtension;
18 import org.eclipse.core.runtime.IExtensionPoint;
19 import org.eclipse.core.runtime.Platform;
20 import org.eclipse.jface.viewers.IStructuredContentProvider;
21 import org.eclipse.jface.viewers.Viewer;
22
23 /**
24  * The FiltersContentProvider provides the elements for use by the list dialog
25  * for selecting the patterns to apply.
26  */
27 /* package */class FiltersContentProvider implements
28         IStructuredContentProvider {
29
30     private static List JavaDoc definedFilters;
31
32     private static List JavaDoc defaultFilters;
33
34     private ResourcePatternFilter resourceFilter;
35
36     /**
37      * Create a FiltersContentProvider using the selections from the suppliec
38      * resource filter.
39      */
40     public FiltersContentProvider(ResourcePatternFilter filter) {
41         this.resourceFilter = filter;
42     }
43
44     /* (non-Javadoc)
45      * Method declared on IContentProvider.
46      */
47     public void dispose() {
48     }
49
50     /**
51      * Returns the filters which are enabled by default.
52      *
53      * @return a list of strings
54      */
55     public static List JavaDoc getDefaultFilters() {
56         if (defaultFilters == null) {
57             readFilters();
58         }
59         return defaultFilters;
60     }
61
62     /**
63      * Returns the filters currently defined for the navigator.
64      *
65      * @return a list of strings
66      */
67     public static List JavaDoc getDefinedFilters() {
68         if (definedFilters == null) {
69             readFilters();
70         }
71         return definedFilters;
72     }
73
74     /* (non-Javadoc)
75      * Method declared on IStructuredContentProvider.
76      */
77     public Object JavaDoc[] getElements(Object JavaDoc inputElement) {
78         return getDefinedFilters().toArray();
79     }
80
81     /**
82      * Return the initially selected elements.
83      */
84     public String JavaDoc[] getInitialSelections() {
85         return this.resourceFilter.getPatterns();
86     }
87
88     /* (non-Javadoc)
89      * Method declared on IContentProvider.
90      */
91     public void inputChanged(Viewer viewer, Object JavaDoc oldInput, Object JavaDoc newInput) {
92     }
93
94     /**
95      * Reads the filters currently defined for the workbench.
96      */
97     private static void readFilters() {
98         definedFilters = new ArrayList JavaDoc();
99         defaultFilters = new ArrayList JavaDoc();
100         IExtensionPoint extension = Platform.getExtensionRegistry()
101                 .getExtensionPoint(ResourcePatternFilter.FILTERS_TAG);
102         if (extension != null) {
103             IExtension[] extensions = extension.getExtensions();
104             for (int i = 0; i < extensions.length; i++) {
105                 IConfigurationElement[] configElements = extensions[i]
106                         .getConfigurationElements();
107                 for (int j = 0; j < configElements.length; j++) {
108                     String JavaDoc pattern = configElements[j].getAttribute("pattern");//$NON-NLS-1$
109 if (pattern != null) {
110                         definedFilters.add(pattern);
111                     }
112                     String JavaDoc selected = configElements[j]
113                             .getAttribute("selected");//$NON-NLS-1$
114 if (selected != null && selected.equalsIgnoreCase("true")) { //$NON-NLS-1$
115 defaultFilters.add(pattern);
116                     }
117                 }
118
119             }
120         }
121     }
122 }
123
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