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.workbench;
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14 import java.util.Arrays;
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15 import java.util.Collections;
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16 import java.util.List;
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18 import org.eclipse.core.runtime.IConfigurationElement;
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19 import org.eclipse.core.runtime.IExtension;
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20 import org.eclipse.core.runtime.IExtensionPoint;
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21 import org.eclipse.core.runtime.Platform;
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22 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
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23 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
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24 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
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25 import org.eclipse.core.runtime.dynamichelpers.IFilter;
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26 import org.simantics.ui.internal.Activator;
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27 import org.simantics.utils.datastructures.MapList;
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29 public class PerspectiveContextBindingManager implements IExtensionChangeHandler {
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31 private final static String NAMESPACE = Activator.PLUGIN_ID;
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33 private final static String EP_NAME = "perspectiveContextBinding";
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35 private ExtensionTracker tracker;
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37 private MapList<String, IPerspectiveContextExtension> extensions = new MapList<String, IPerspectiveContextExtension>();
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39 private static PerspectiveContextBindingManager INSTANCE;
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41 public static synchronized PerspectiveContextBindingManager getInstance() {
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42 if (INSTANCE == null)
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43 INSTANCE = new PerspectiveContextBindingManager();
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47 public static synchronized void dispose() {
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48 if (INSTANCE != null) {
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54 private PerspectiveContextBindingManager() {
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55 tracker = new ExtensionTracker();
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57 // Cache defined actions
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58 IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
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59 loadExtensions(expt.getConfigurationElements());
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61 // Start tracking for new and removed extensions
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62 IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
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63 tracker.registerHandler(this, filter);
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66 private void close() {
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69 extensions = new MapList<String, IPerspectiveContextExtension>();
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72 public synchronized List<IPerspectiveContextExtension> getExtensions(String perspectiveId) {
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73 List<IPerspectiveContextExtension> exts = extensions.getValues(perspectiveId);
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75 return Arrays.asList();
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76 return Collections.unmodifiableList(exts);
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79 private synchronized void loadExtensions(IConfigurationElement[] elements) {
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80 for (IConfigurationElement el : elements) {
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81 String perspectiveId = el.getAttribute("perspectiveId");
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82 String contextId = el.getAttribute("contextIds");
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83 String[] contextIds = contextId.split(",");
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85 IPerspectiveContextExtension ext = new IPerspectiveContextExtension.Stub(perspectiveId, contextIds);
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87 // Start tracking the new extension object, its removal will be notified of
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88 // with removeExtension(extension, Object[]).
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89 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
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91 extensions.add(perspectiveId, ext);
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96 public void addExtension(IExtensionTracker tracker, IExtension extension) {
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97 loadExtensions(extension.getConfigurationElements());
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101 public synchronized void removeExtension(IExtension extension, Object[] objects) {
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103 for (Object o : objects) {
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104 IPerspectiveContextExtension ext = (IPerspectiveContextExtension) o;
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105 tracker.unregisterObject(extension, ext);
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106 extensions.remove(ext.getPerspectiveId(), ext);
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