1 /*******************************************************************************
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2 * Copyright (c) 2015 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 * Semantum Oy - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.internal.startup;
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14 import java.util.Arrays;
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15 import java.util.HashSet;
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16 import java.util.Set;
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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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28 * Registry implementation for org.simantics.startup extensions.
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30 * @author Tuukka Lehtonen
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32 public class StartupRegistry implements IExtensionChangeHandler {
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34 private final static String NAMESPACE = "org.simantics";
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35 private final static String EP_NAME = "startup";
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36 private final static String STARTUP = "startup";
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38 private final ExtensionTracker tracker;
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40 private StartupExtension[] extensions = {};
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42 public StartupRegistry() {
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43 tracker = new ExtensionTracker();
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45 // Cache defined actions
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46 IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
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47 loadExtensions(expt.getConfigurationElements());
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49 // Start tracking for new and removed extensions
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50 IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
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51 tracker.registerHandler(this, filter);
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54 private void loadExtensions(IConfigurationElement[] configurationElements) {
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55 Set<StartupExtension> newExtensions = new HashSet<StartupExtension>(Arrays.asList(extensions));
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57 // These are all "startup" elements with required attributes
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59 for (IConfigurationElement el : configurationElements) {
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60 if (STARTUP.equals(el.getName())) {
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61 String clazz = el.getAttribute(StartupExtension.CLASS);
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62 if (clazz == null) {
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63 // No class defined.
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67 StartupExtension ext = new StartupExtension(el);
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69 // Start tracking the new extension object, its removal will be notified of
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70 // with removeExtension(extension, Object[]).
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71 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
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73 newExtensions.add(ext);
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77 // Atomic assignment
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78 this.extensions = newExtensions.toArray(new StartupExtension[newExtensions.size()]);
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82 public void addExtension(IExtensionTracker tracker, IExtension extension) {
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83 loadExtensions(extension.getConfigurationElements());
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87 public void removeExtension(IExtension extension, Object[] objects) {
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88 Set<StartupExtension> newExtensions = new HashSet<StartupExtension>(Arrays.asList(extensions));
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90 for (Object o : objects) {
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91 tracker.unregisterObject(extension, o);
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92 newExtensions.remove(o);
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95 // Atomic assignment
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96 this.extensions = newExtensions.toArray(new StartupExtension[newExtensions.size()]);
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99 public StartupExtension[] getExtensions() {
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