1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.ui;
14 import java.util.ArrayList;
15 import java.util.Arrays;
16 import java.util.Collections;
17 import java.util.Comparator;
18 import java.util.HashSet;
19 import java.util.List;
22 import org.eclipse.core.runtime.IConfigurationElement;
23 import org.eclipse.core.runtime.IExtension;
24 import org.eclipse.core.runtime.IExtensionPoint;
25 import org.eclipse.core.runtime.Platform;
26 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
27 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
28 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
29 import org.eclipse.core.runtime.dynamichelpers.IFilter;
30 import org.simantics.ui.internal.Activator;
31 import org.simantics.utils.strings.StringUtils;
34 * @author Tuukka Lehtonen
36 public class DoubleClickExtensionManager implements IExtensionChangeHandler {
38 private final static String NAMESPACE = Activator.PLUGIN_ID;
40 private final static String EP_NAME = "doubleClick";
42 private ExtensionTracker tracker;
44 private IDoubleClickExtension[] extensions = new IDoubleClickExtension[0];
46 private static DoubleClickExtensionManager INSTANCE;
49 public static synchronized DoubleClickExtensionManager getInstance() {
51 INSTANCE = new DoubleClickExtensionManager();
55 public static synchronized void dispose() {
56 if (INSTANCE != null) {
63 private DoubleClickExtensionManager() {
64 tracker = new ExtensionTracker();
66 // Cache defined actions
67 IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
68 loadExtensions(expt.getConfigurationElements());
70 // Start tracking for new and removed extensions
71 IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
72 tracker.registerHandler(this, filter);
75 private void close() {
78 extensions = new IDoubleClickExtension[0];
81 public IDoubleClickExtension[] getExtensions() {
85 private void loadExtensions(IConfigurationElement[] elements) {
86 Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));
88 for (IConfigurationElement el : elements) {
89 String name = StringUtils.safeString(el.getAttribute("name"));
92 String p = el.getAttribute("priority");
94 priority = Double.parseDouble(p);
96 } catch (NumberFormatException e) {
98 IDoubleClickExtension ext = new DoubleClickExtension(el, name, priority);
100 // Start tracking the new extension object, its removal will be notified of
101 // with removeExtension(extension, Object[]).
102 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
104 newExtensions.add(ext);
107 // Sort in descending priority order
108 List<IDoubleClickExtension> unsorted = new ArrayList<IDoubleClickExtension>(newExtensions);
109 Collections.sort(unsorted, new Comparator<IDoubleClickExtension>() {
111 public int compare(IDoubleClickExtension o1, IDoubleClickExtension o2) {
112 return Double.compare(o2.getPriority(), o1.getPriority());
117 this.extensions = unsorted.toArray(new IDoubleClickExtension[unsorted.size()]);
121 public void addExtension(IExtensionTracker tracker, IExtension extension) {
122 loadExtensions(extension.getConfigurationElements());
126 public void removeExtension(IExtension extension, Object[] objects) {
127 Set<IDoubleClickExtension> newExtensions = new HashSet<IDoubleClickExtension>(Arrays.asList(extensions));
129 for (Object o : objects) {
130 tracker.unregisterObject(extension, o);
131 newExtensions.remove(o);
135 this.extensions = newExtensions.toArray(new IDoubleClickExtension[newExtensions.size()]);