bundles/org.simantics.selectionview/src/org/simantics/selectionview/SelectionProcessorBindingExtensionManager.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.selectionview;\r
  13 \r
  14 import java.util.Arrays;\r
  15 import java.util.HashSet;\r
  16 import java.util.Set;\r
  17 \r
  18 import org.eclipse.core.runtime.CoreException;\r
  19 import org.eclipse.core.runtime.IConfigurationElement;\r
  20 import org.eclipse.core.runtime.IExtension;\r
  21 import org.eclipse.core.runtime.IExtensionPoint;\r
  22 import org.eclipse.core.runtime.Platform;\r
  23 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;\r
  24 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;\r
  25 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;\r
  26 import org.eclipse.core.runtime.dynamichelpers.IFilter;\r
  27 import org.simantics.browsing.ui.common.Activator;\r
  28 import org.simantics.scl.reflection.OntologyVersions;\r
  29 import org.simantics.utils.strings.StringUtils;\r
  30 \r
  31 /**\r
  32  * @author Tuukka Lehtonen\r
  33  */\r
  34 public class SelectionProcessorBindingExtensionManager implements IExtensionChangeHandler {\r
  35 \r
  36     private final static String                  NAMESPACE  = Activator.PLUGIN_ID;\r
  37 \r
  38     private final static String                  EP_NAME    = "selectionProcessorBinding";\r
  39 \r
  40     private ExtensionTracker                     tracker;\r
  41 \r
  42     private SelectionProcessorBindingExtension[] extensions = new SelectionProcessorBindingExtension[0];\r
  43 \r
  44     SelectionProcessorBindingExtensionManager() {\r
  45         tracker = new ExtensionTracker();\r
  46 \r
  47         // Cache defined actions\r
  48         IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);\r
  49         loadExtensions(expt.getConfigurationElements());\r
  50 \r
  51         // Start tracking for new and removed extensions\r
  52         IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);\r
  53         tracker.registerHandler(this, filter);\r
  54     }\r
  55 \r
  56     void close() {\r
  57         tracker.close();\r
  58         tracker = null;\r
  59         extensions = new SelectionProcessorBindingExtension[0];\r
  60     }\r
  61 \r
  62     public SelectionProcessorBindingExtension[] getExtensions() {\r
  63         return extensions;\r
  64     }\r
  65 \r
  66     SelectionProcessorReferenceBinding createReferenceBinding(String browseContext, String factoryId) {\r
  67         return new SelectionProcessorReferenceBinding(browseContext, factoryId);\r
  68     }\r
  69 \r
  70 \r
  71     private void loadExtensions(IConfigurationElement[] elements) {\r
  72 \r
  73         Set<SelectionProcessorBindingExtension> newExtensions = new HashSet<SelectionProcessorBindingExtension>(Arrays.asList(extensions));\r
  74 \r
  75         for (IConfigurationElement el : elements) {\r
  76 \r
  77             String browseContext = OntologyVersions.getInstance().currentVersion(StringUtils.safeString(el.getAttribute("browseContext")));\r
  78 \r
  79             for (IConfigurationElement child : el.getChildren("reference")) {\r
  80 \r
  81                 String factoryId = StringUtils.safeString(child.getAttribute("id"));\r
  82                 SelectionProcessorBindingExtension ext = createReferenceBinding(browseContext, factoryId);\r
  83 \r
  84                 // Start tracking the new extension object, its removal will be notified of\r
  85                 // with removeExtension(extension, Object[]).\r
  86                 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);\r
  87 \r
  88                 newExtensions.add(ext);\r
  89 \r
  90             }\r
  91 \r
  92             for (IConfigurationElement child : el.getChildren("implementation")) {\r
  93 \r
  94                 try {\r
  95 \r
  96                     SelectionProcessor<?, ?> processor = (SelectionProcessor<?, ?>) child.createExecutableExtension("class");\r
  97                     SelectionProcessorBindingExtension ext = new SelectionProcessorImplementationBinding(browseContext, processor);\r
  98 \r
  99                     // Start tracking the new extension object, its removal will be notified of\r
 100                     // with removeExtension(extension, Object[]).\r
 101                     tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);\r
 102 \r
 103                     newExtensions.add(ext);\r
 104 \r
 105                 } catch (CoreException e) {\r
 106 \r
 107                     System.out.println(" == Could not load ViewpointContributionFactory '" + child.getAttribute("class") + "' due to the following error: " + e.getMessage()  );\r
 108 \r
 109                 }\r
 110 \r
 111             }\r
 112 \r
 113         }\r
 114 \r
 115         // Atomic assignment\r
 116         this.extensions = newExtensions.toArray(new SelectionProcessorBindingExtension[newExtensions.size()]);\r
 117     }\r
 118 \r
 119     @Override\r
 120     public void addExtension(IExtensionTracker tracker, IExtension extension) {\r
 121         loadExtensions(extension.getConfigurationElements());\r
 122     }\r
 123 \r
 124     @Override\r
 125     public void removeExtension(IExtension extension, Object[] objects) {\r
 126         Set<SelectionProcessorBindingExtension> newExtensions = new HashSet<SelectionProcessorBindingExtension>(Arrays.asList(extensions));\r
 127 \r
 128         for (Object o : objects) {\r
 129             tracker.unregisterObject(extension, o);\r
 130             newExtensions.remove(o);\r
 131         }\r
 132 \r
 133         // Atomic assignment\r
 134         this.extensions = newExtensions.toArray(new SelectionProcessorBindingExtension[newExtensions.size()]);\r
 135     }\r
 136 \r
 137     public Set<SelectionProcessorBinding> getBoundContributions(Set<String> browseContexts) {\r
 138         HashSet<SelectionProcessorBinding> result = new HashSet<SelectionProcessorBinding>();\r
 139 \r
 140         for (SelectionProcessorBindingExtension binding : getExtensions()) {\r
 141             if (browseContexts.contains(binding.getBrowseContext())) {\r
 142                 SelectionProcessor<?, ?> processor = binding.getProcessor();\r
 143                 if (processor != null) {\r
 144 //                    System.out.println("----------- Plugin contribution " + binding.getFactory());\r
 145                     result.add(new SelectionProcessorBindingImpl(processor));\r
 146                 } else {\r
 147 //                    System.out.println("FAILED: ----------- No factory for " + binding);\r
 148                 }\r
 149             }\r
 150         }\r
 151 \r
 152         return result;\r
 153     }\r
 154 \r
 155     private static SelectionProcessorBindingExtensionManager INSTANCE;\r
 156 \r
 157     public static synchronized SelectionProcessorBindingExtensionManager getInstance() {\r
 158         if (INSTANCE == null)\r
 159             INSTANCE = new SelectionProcessorBindingExtensionManager();\r
 160         return INSTANCE;\r
 161     }\r
 162 \r
 163     public static synchronized void dispose() {\r
 164         if (INSTANCE != null) {\r
 165             INSTANCE.close();\r
 166             INSTANCE = null;\r
 167         }\r
 168     }\r
 169 \r
 170 }\r