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