Source Code Cross Referenced for PreferencePatternFilter.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » internal » dialogs » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.internal.dialogs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2005, 2006 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *******************************************************************************/package org.eclipse.ui.internal.dialogs;
011:
012:        import java.util.ArrayList;
013:        import java.util.Collection;
014:        import java.util.HashMap;
015:        import java.util.Iterator;
016:        import java.util.List;
017:        import java.util.Map;
018:
019:        import org.eclipse.jface.preference.IPreferenceNode;
020:        import org.eclipse.jface.viewers.ITreeContentProvider;
021:        import org.eclipse.jface.viewers.TreeViewer;
022:        import org.eclipse.jface.viewers.Viewer;
023:        import org.eclipse.ui.dialogs.PatternFilter;
024:        import org.eclipse.ui.internal.preferences.WorkbenchPreferenceExtensionNode;
025:
026:        /**
027:         * A class that handles filtering preference node items based on a supplied
028:         * matching string.
029:         * 
030:         * @since 3.2
031:         * 
032:         */
033:        public class PreferencePatternFilter extends PatternFilter {
034:
035:            /**
036:             * this cache is needed because
037:             * WorkbenchPreferenceExtensionNode.getKeywordLabels() is expensive. When it
038:             * tracks keyword changes effectivly than this cache can be removed.
039:             */
040:            private Map keywordCache = new HashMap();
041:
042:            /**
043:             * Create a new instance of a PreferencePatternFilter
044:             * 
045:             * @param isMatchItem
046:             */
047:            public PreferencePatternFilter() {
048:                super ();
049:            }
050:
051:            /*
052:             * Return true if the given Object matches with any possible keywords that
053:             * have been provided. Currently this is only applicable for preference and
054:             * property pages.
055:             */
056:            private String[] getKeywords(Object element) {
057:                List keywordList = new ArrayList();
058:                if (element instanceof  WorkbenchPreferenceExtensionNode) {
059:                    WorkbenchPreferenceExtensionNode workbenchNode = (WorkbenchPreferenceExtensionNode) element;
060:
061:                    Collection keywordCollection = (Collection) keywordCache
062:                            .get(element);
063:                    if (keywordCollection == null) {
064:                        keywordCollection = workbenchNode.getKeywordLabels();
065:                        keywordCache.put(element, keywordCollection);
066:                    }
067:                    if (!keywordCollection.isEmpty()) {
068:                        Iterator keywords = keywordCollection.iterator();
069:                        while (keywords.hasNext()) {
070:                            keywordList.add(keywords.next());
071:                        }
072:                    }
073:                }
074:                return (String[]) keywordList.toArray(new String[keywordList
075:                        .size()]);
076:            }
077:
078:            /*
079:             * (non-Javadoc)
080:             * 
081:             * @see org.eclipse.ui.internal.dialogs.PatternFilter#isElementSelectable(java.lang.Object)
082:             */
083:            public boolean isElementSelectable(Object element) {
084:                return element instanceof  WorkbenchPreferenceExtensionNode;
085:            }
086:
087:            /* (non-Javadoc)
088:             * @see org.eclipse.ui.dialogs.PatternFilter#isElementVisible(org.eclipse.jface.viewers.Viewer, java.lang.Object)
089:             */
090:            public boolean isElementVisible(Viewer viewer, Object element) {
091:                // Preference nodes are not differentiated based on category since 
092:                // categories are selectable nodes.
093:                if (isLeafMatch(viewer, element)) {
094:                    return true;
095:                }
096:
097:                ITreeContentProvider contentProvider = (ITreeContentProvider) ((TreeViewer) viewer)
098:                        .getContentProvider();
099:                IPreferenceNode node = (IPreferenceNode) element;
100:                Object[] children = contentProvider.getChildren(node);
101:                // Will return true if any subnode of the element matches the search
102:                if (filter(viewer, element, children).length > 0) {
103:                    return true;
104:                }
105:                return false;
106:            }
107:
108:            /* (non-Javadoc)
109:             * @see org.eclipse.ui.dialogs.PatternFilter#isLeafMatch(org.eclipse.jface.viewers.Viewer, java.lang.Object)
110:             * 
111:             */
112:            protected boolean isLeafMatch(Viewer viewer, Object element) {
113:                IPreferenceNode node = (IPreferenceNode) element;
114:                String text = node.getLabelText();
115:
116:                if (wordMatches(text)) {
117:                    return true;
118:                }
119:
120:                // Also need to check the keywords
121:                String[] keywords = getKeywords(node);
122:                for (int i = 0; i < keywords.length; i++) {
123:                    if (wordMatches(keywords[i])) {
124:                        return true;
125:                    }
126:                }
127:                return false;
128:            }
129:
130:        }
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