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.browsing.ui.common.extension;
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14 import java.util.Arrays;
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15 import java.util.Collection;
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16 import java.util.HashSet;
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17 import java.util.Set;
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19 import org.eclipse.core.runtime.CoreException;
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20 import org.eclipse.core.runtime.IConfigurationElement;
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21 import org.eclipse.core.runtime.IExtension;
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22 import org.eclipse.core.runtime.IExtensionPoint;
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23 import org.eclipse.core.runtime.Platform;
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24 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
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25 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
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26 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
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27 import org.eclipse.core.runtime.dynamichelpers.IFilter;
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28 import org.simantics.browsing.ui.common.Activator;
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29 import org.simantics.browsing.ui.common.extension.internal.EvaluatorBindingExtension;
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30 import org.simantics.browsing.ui.common.extension.internal.EvaluatorImplementationBinding;
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31 import org.simantics.browsing.ui.common.extension.internal.EvaluatorReferenceBinding;
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32 import org.simantics.utils.strings.StringUtils;
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35 * @author Tuukka Lehtonen
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37 public class EvaluatorBindingExtensionManager implements IExtensionChangeHandler {
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39 private final static String NAMESPACE = Activator.PLUGIN_ID;
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41 private final static String EP_NAME = "evaluatorBinding";
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43 private ExtensionTracker tracker;
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45 private EvaluatorBindingExtension[] extensions = new EvaluatorBindingExtension[0];
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47 private static EvaluatorBindingExtensionManager INSTANCE;
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50 public static synchronized EvaluatorBindingExtensionManager getInstance() {
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51 if (INSTANCE == null)
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52 INSTANCE = new EvaluatorBindingExtensionManager();
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56 public static synchronized void dispose() {
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57 if (INSTANCE != null) {
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64 private EvaluatorBindingExtensionManager() {
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65 tracker = new ExtensionTracker();
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67 // Cache defined actions
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68 IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
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69 loadExtensions(expt.getConfigurationElements());
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71 // Start tracking for new and removed extensions
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72 IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
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73 tracker.registerHandler(this, filter);
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76 private void close() {
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79 extensions = new EvaluatorBindingExtension[0];
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82 public EvaluatorBindingExtension[] getExtensions() {
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86 private void loadExtensions(IConfigurationElement[] elements) {
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88 Set<EvaluatorBindingExtension> newExtensions = new HashSet<EvaluatorBindingExtension>(Arrays.asList(extensions));
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90 for (IConfigurationElement el : elements) {
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92 String browseContext = StringUtils.safeString(el.getAttribute("browseContext"));
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94 for(IConfigurationElement child : el.getChildren("reference")) {
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96 String factoryId = StringUtils.safeString(child.getAttribute("id"));
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97 EvaluatorBindingExtension ext = new EvaluatorReferenceBinding(browseContext, factoryId);
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99 // Start tracking the new extension object, its removal will be notified of
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100 // with removeExtension(extension, Object[]).
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101 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
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103 newExtensions.add(ext);
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107 for(IConfigurationElement child : el.getChildren("implementation")) {
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111 EvaluatorFactory factory = (EvaluatorFactory)child.createExecutableExtension("class");
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112 EvaluatorBindingExtension ext = new EvaluatorImplementationBinding(browseContext, factory);
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114 // Start tracking the new extension object, its removal will be notified of
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115 // with removeExtension(extension, Object[]).
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116 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
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118 newExtensions.add(ext);
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120 } catch (CoreException e) {
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122 System.out.println(" == Could not load ViewpointContributionFactory '" + child.getAttribute("class") + "' due to the following error: " + e.getMessage() );
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130 // Atomic assignment
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131 this.extensions = newExtensions.toArray(new EvaluatorBindingExtension[newExtensions.size()]);
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135 public void addExtension(IExtensionTracker tracker, IExtension extension) {
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136 loadExtensions(extension.getConfigurationElements());
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140 public void removeExtension(IExtension extension, Object[] objects) {
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141 Set<EvaluatorBindingExtension> newExtensions = new HashSet<EvaluatorBindingExtension>(Arrays.asList(extensions));
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143 for (Object o : objects) {
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144 tracker.unregisterObject(extension, o);
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145 newExtensions.remove(o);
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148 // Atomic assignment
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149 this.extensions = newExtensions.toArray(new EvaluatorBindingExtension[newExtensions.size()]);
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152 public Collection<EvaluatorFactory> getBoundFactories(Set<String> browseContexts) {
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154 // ArrayList<EvaluatorFactory> result = new ArrayList<EvaluatorFactory>();
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155 // for(EvaluatorBindingExtension binding : getExtensions()) {
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156 // if(browseContexts.contains(binding.browserId())) {
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157 // EvaluatorFactory factory = EvaluatorFactoryExtensionManager.getFactory(binding.factoryId());
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158 // result.add(factory);
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163 HashSet<EvaluatorFactory> result = new HashSet<EvaluatorFactory>();
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165 for(EvaluatorBindingExtension binding : getExtensions()) {
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166 if(browseContexts.contains(binding.getBrowseContext())) {
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167 EvaluatorFactory factory = binding.getFactory();
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168 if(factory != null) {
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169 // System.out.println("----------- Plugin contribution " + binding.getFactory());
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170 result.add(factory);
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172 // System.out.println("FAILED: ----------- No factory for " + binding);
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