resolving this issue

refs 1151

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/internal/LibraryPrototypeProvider.java

@@ -17,7 +17,9 @@ $Id: codetemplates.xml 1 2011-01-01 00:00:01Z hoelzl $
 +--------------------------------------------------------------------------*/
 package org.fortiss.tooling.kernel.internal;
 
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.eclipse.emf.ecore.EObject;
 import org.fortiss.tooling.kernel.extension.ILibraryElementHandler;
@@ -34,7 +36,7 @@ import org.fortiss.tooling.kernel.service.ILibraryService;
  * @author ratiu
  * @author $Author: hoelzl $
  * @version $Rev: 18709 $
- * @ConQAT.Rating YELLOW Hash: C80FA91F50ADA9FFBC25CE927814BF6C
+ * @ConQAT.Rating YELLOW Hash: C6CEC15D2930553DD96080E74D1FFF14
  */
 public class LibraryPrototypeProvider extends PrototypeProviderBase {
 
@@ -44,6 +46,7 @@ public class LibraryPrototypeProvider extends PrototypeProviderBase {
 	 */
 	public void refreshPrototypes() {
 		prototypes.clear();
+		categories.clear();
 		registerPrototypes();
 	}
 
@@ -51,6 +54,9 @@ public class LibraryPrototypeProvider extends PrototypeProviderBase {
 	@Override
 	protected void registerPrototypes() {
 		PrototypeCategory libraryCategory = registerPrototypeCategory("Library");
+		Map<String, PrototypeCategory> registeredCategoriesMap =
+				new HashMap<String, PrototypeCategory>();
+
 		for(ILibraryElement libElem : ILibraryService.INSTANCE
 				.getLibraryElementsFromAllWorkspaceLibraries()) {
 			List<ILibraryElementHandler<EObject>> handlers =
@@ -64,7 +70,13 @@ public class LibraryPrototypeProvider extends PrototypeProviderBase {
 			prototypes.add(prot);
 
 			String categoryName = ((ILibraryPackage)libElem.eContainer()).getName();
-			PrototypeCategory current = registerPrototypeCategory(libraryCategory, categoryName);
+			PrototypeCategory current = registeredCategoriesMap.get(categoryName);
+
+			if(current == null) {
+				current = registerPrototypeCategory(libraryCategory, categoryName);
+				registeredCategoriesMap.put(categoryName, current);
+			}
+
 			current.add(prot);
 		}
 	}