From 8e0be29176259b3290fb364c37167df44f63f4c6 Mon Sep 17 00:00:00 2001
From: luukkainen <luukkainen@ac1ea38d-2e2b-0410-8846-a27921b304fc>
Date: Mon, 12 Jan 2009 11:15:23 +0000
Subject: [PATCH] Replaced deprecated ExtensionLoader

git-svn-id: https://www.simantics.org/svn/simantics/3d/branches/dev@8583 ac1ea38d-2e2b-0410-8846-a27921b304fc
---
 .../g3d/base/GeometryProviderRegistry.java    | 102 +++++++++++++++---
 1 file changed, 87 insertions(+), 15 deletions(-)

diff --git a/org.simantics.proconf.g3d/src/org/simantics/proconf/g3d/base/GeometryProviderRegistry.java b/org.simantics.proconf.g3d/src/org/simantics/proconf/g3d/base/GeometryProviderRegistry.java
index fa92b87f..07a48e49 100644
--- a/org.simantics.proconf.g3d/src/org/simantics/proconf/g3d/base/GeometryProviderRegistry.java
+++ b/org.simantics.proconf.g3d/src/org/simantics/proconf/g3d/base/GeometryProviderRegistry.java
@@ -10,39 +10,86 @@
  *******************************************************************************/
 package org.simantics.proconf.g3d.base;
 
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IFilter;
 import org.simantics.db.Resource;
 import org.simantics.layer0.utils.IEntity;
-import org.simantics.utils.ui.plugin.Extension;
-import org.simantics.utils.ui.plugin.ExtensionLoader;
+import org.simantics.utils.ui.ErrorLogger;
 
 import com.jme.scene.Geometry;
 
-public class GeometryProviderRegistry {
+public class GeometryProviderRegistry implements IExtensionChangeHandler {
     private static GeometryProviderRegistry instance;
     public final static String ELEMENT_NAME = "Geometry";
-    public final static String NAME_SPACE = "org.simantics.proconf.g3d";
+    public final static String NAMESPACE = "org.simantics.proconf.g3d";
     public final static String EP_NAME = "geometry";
     
-    private ExtensionLoader<GeometryProvider> loader;
+    private ExtensionTracker tracker;
+    
+    private List<GeometryProviderExtension> extensions = new ArrayList<GeometryProviderExtension>();
     private Map<Resource,GeometryProvider> providers;
     
     private GeometryProviderRegistry() {
-        loader = new ExtensionLoader<GeometryProvider>(ELEMENT_NAME, NAME_SPACE, EP_NAME);
         providers = new HashMap<Resource,GeometryProvider>();
+        
+        tracker = new ExtensionTracker();
+		
+		IExtensionPoint ep = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE,EP_NAME);
+		loadExtensions(ep.getConfigurationElements());
+		
+		IFilter filter = ExtensionTracker.createExtensionPointFilter(ep);
+		tracker.registerHandler(this, filter);
     }
     
-    public static GeometryProviderRegistry getInstance() {
+    private void close() {
+		tracker.close();
+		tracker = null;
+		extensions = new ArrayList<GeometryProviderExtension>();
+	}
+    
+    public static synchronized GeometryProviderRegistry getInstance() {
         if (instance==null) instance = new GeometryProviderRegistry();
         return instance;
     }
-
-    public Extension<GeometryProvider>[] getExtensions() {
-        return loader.getExtensions();
-    }
+    
+    public static synchronized void dispose() {
+		if (instance != null) {
+			instance.close();
+			instance = null;
+		}	
+	}
+    
+    public synchronized List<GeometryProviderExtension> getExtensions() {
+		return Collections.unmodifiableList(extensions);
+	}
+    
+    private synchronized void loadExtensions(IConfigurationElement[] elements) {
+		for (IConfigurationElement el : elements) {
+			String id = el.getAttribute("id");
+			try {
+				Object o = el.createExecutableExtension("class");
+				GeometryProviderExtension ext = new GeometryProviderExtension(id,(GeometryProvider)o);
+				tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
+				extensions.add(ext);
+			} catch (CoreException e) {
+				ErrorLogger.defaultLogError("Cannot create java interface for GeometryProvider " + id, e);
+			}
+		}
+	}
     
     private Map<Resource,GeometryProvider> getProviderMap() {
         return providers;
@@ -60,10 +107,11 @@ public class GeometryProviderRegistry {
     	for (IEntity t : types) {
     		GeometryProvider provider = getInstance().getProviderMap().get(t.getResource());
         	if (provider == null) {
-                for (Extension<GeometryProvider> e : getInstance().getExtensions()) {
-                    if (e.getInstance().canHandle(thing)) {
-                        getInstance().getProviderMap().put(t.getResource(), e.getInstance());
-                        return e.getInstance();
+                //for (Extension<GeometryProvider> e : getInstance().getExtensions()) {
+        		for (GeometryProviderExtension e : getInstance().getExtensions()) {
+                    if (e.provider.canHandle(thing)) {
+                        getInstance().getProviderMap().put(t.getResource(), e.provider);
+                        return e.provider;
                     }
                 }
                 
@@ -74,4 +122,28 @@ public class GeometryProviderRegistry {
     	
     	throw new UnsupportedOperationException("Cannot handle resource " + thing);
     }
+    
+    @Override
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {
+        loadExtensions(extension.getConfigurationElements());
+    }
+    
+    @Override
+	public synchronized void removeExtension(IExtension extension, Object[] objects) {
+		for (Object o : objects) {
+			GeometryProviderExtension ext = (GeometryProviderExtension) o;
+			tracker.unregisterObject(extension, ext);
+			extensions.remove(ext);
+		}
+	}
+    
+    public class GeometryProviderExtension {
+		public String id;
+		public GeometryProvider provider;
+		
+		public GeometryProviderExtension(String id, GeometryProvider provider) {
+			this.id = id;
+			this.provider = provider;
+		}
+	}
 }
-- 
2.45.2