org.simantics.g3d/src/org/simantics/proconf/g3d/base/GeometryProviderRegistry.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007- VTT Technical Research Centre of Finland.\r
   3  * All rights reserved. This program and the accompanying materials\r
   4  * are made available under the terms of the Eclipse Public License v1.0\r
   5  * which accompanies this distribution, and is available at\r
   6  * http://www.eclipse.org/legal/epl-v10.html\r
   7  *\r
   8  * Contributors:\r
   9  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  10  *******************************************************************************/\r
  11 package org.simantics.proconf.g3d.base;\r
  12 \r
  13 import java.util.ArrayList;\r
  14 import java.util.Collection;\r
  15 import java.util.Collections;\r
  16 import java.util.HashMap;\r
  17 import java.util.List;\r
  18 import java.util.Map;\r
  19 \r
  20 import org.eclipse.core.runtime.CoreException;\r
  21 import org.eclipse.core.runtime.IConfigurationElement;\r
  22 import org.eclipse.core.runtime.IExtension;\r
  23 import org.eclipse.core.runtime.IExtensionPoint;\r
  24 import org.eclipse.core.runtime.Platform;\r
  25 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;\r
  26 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;\r
  27 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;\r
  28 import org.eclipse.core.runtime.dynamichelpers.IFilter;\r
  29 import org.simantics.db.Resource;\r
  30 import org.simantics.layer0.utils.IEntity;\r
  31 import org.simantics.utils.ui.ErrorLogger;\r
  32 \r
  33 import com.jme.scene.Geometry;\r
  34 \r
  35 public class GeometryProviderRegistry implements IExtensionChangeHandler {\r
  36     private static GeometryProviderRegistry instance;\r
  37     public final static String ELEMENT_NAME = "Geometry";\r
  38     public final static String NAMESPACE = "org.simantics.proconf.g3d";\r
  39     public final static String EP_NAME = "geometry";\r
  40     \r
  41     private ExtensionTracker tracker;\r
  42     \r
  43     private List<GeometryProviderExtension> extensions = new ArrayList<GeometryProviderExtension>();\r
  44     private Map<Resource,GeometryProvider> providers;\r
  45     \r
  46     private GeometryProviderRegistry() {\r
  47         providers = new HashMap<Resource,GeometryProvider>();\r
  48         \r
  49         tracker = new ExtensionTracker();\r
  50                 \r
  51                 IExtensionPoint ep = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE,EP_NAME);\r
  52                 loadExtensions(ep.getConfigurationElements());\r
  53                 \r
  54                 IFilter filter = ExtensionTracker.createExtensionPointFilter(ep);\r
  55                 tracker.registerHandler(this, filter);\r
  56     }\r
  57     \r
  58     private void close() {\r
  59                 tracker.close();\r
  60                 tracker = null;\r
  61                 extensions = new ArrayList<GeometryProviderExtension>();\r
  62         }\r
  63     \r
  64     public static synchronized GeometryProviderRegistry getInstance() {\r
  65         if (instance==null) instance = new GeometryProviderRegistry();\r
  66         return instance;\r
  67     }\r
  68     \r
  69     public static synchronized void dispose() {\r
  70                 if (instance != null) {\r
  71                         instance.close();\r
  72                         instance = null;\r
  73                 }       \r
  74         }\r
  75     \r
  76     public synchronized List<GeometryProviderExtension> getExtensions() {\r
  77                 return Collections.unmodifiableList(extensions);\r
  78         }\r
  79     \r
  80     private synchronized void loadExtensions(IConfigurationElement[] elements) {\r
  81                 for (IConfigurationElement el : elements) {\r
  82                         String id = el.getAttribute("id");\r
  83                         try {\r
  84                                 Object o = el.createExecutableExtension("class");\r
  85                                 GeometryProviderExtension ext = new GeometryProviderExtension(id,(GeometryProvider)o);\r
  86                                 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);\r
  87                                 extensions.add(ext);\r
  88                         } catch (CoreException e) {\r
  89                                 ErrorLogger.defaultLogError("Cannot create java interface for GeometryProvider " + id, e);\r
  90                         }\r
  91                 }\r
  92         }\r
  93     \r
  94     private Map<Resource,GeometryProvider> getProviderMap() {\r
  95         return providers;\r
  96     }\r
  97     \r
  98     public static Geometry[] getGeometry(IEntity thing, boolean transform) {\r
  99         GeometryProvider provider = getGeometryProvider(thing);\r
 100         return provider.getGeometryFromResource(thing, transform);\r
 101     }\r
 102     \r
 103     public static GeometryProvider getGeometryProvider(IEntity thing) {\r
 104         Collection<IEntity> types = thing.getRelatedObjects(thing.getGraph().getBuiltins().InstanceOf);\r
 105         \r
 106         //Resource types[] = OntologyUtils.getTypes(resource);\r
 107         for (IEntity t : types) {\r
 108                 GeometryProvider provider = getInstance().getProviderMap().get(t.getResource());\r
 109                 if (provider == null) {\r
 110                 //for (Extension<GeometryProvider> e : getInstance().getExtensions()) {\r
 111                         for (GeometryProviderExtension e : getInstance().getExtensions()) {\r
 112                     if (e.provider.canHandle(thing)) {\r
 113                         getInstance().getProviderMap().put(t.getResource(), e.provider);\r
 114                         return e.provider;\r
 115                     }\r
 116                 }\r
 117                 \r
 118             } else {\r
 119                 return provider;\r
 120             }\r
 121         }\r
 122         \r
 123         throw new UnsupportedOperationException("Cannot handle resource " + thing);\r
 124     }\r
 125     \r
 126     @Override\r
 127     public void addExtension(IExtensionTracker tracker, IExtension extension) {\r
 128         loadExtensions(extension.getConfigurationElements());\r
 129     }\r
 130     \r
 131     @Override\r
 132         public synchronized void removeExtension(IExtension extension, Object[] objects) {\r
 133                 for (Object o : objects) {\r
 134                         GeometryProviderExtension ext = (GeometryProviderExtension) o;\r
 135                         tracker.unregisterObject(extension, ext);\r
 136                         extensions.remove(ext);\r
 137                 }\r
 138         }\r
 139     \r
 140     public class GeometryProviderExtension {\r
 141                 public String id;\r
 142                 public GeometryProvider provider;\r
 143                 \r
 144                 public GeometryProviderExtension(String id, GeometryProvider provider) {\r
 145                         this.id = id;\r
 146                         this.provider = provider;\r
 147                 }\r
 148         }\r
 149 }\r