Adds a warning, when an ID could not be found

Core/core/src/main/java/org/codeling/lang/base/modeltrans/henshintgg/HenshinTGGTransformation.java

@@ -231,7 +231,11 @@ public class HenshinTGGTransformation extends ModelTransformation {
 							"The initial element {0} has {1} result elements. Will only add the first initial element. Translations should not create correspondence objects that have multiple sources or multiple targets.",
 							initialObject, entry.getValue().size()), null);
 
-				idRegistry.addTranslationModelElement(targetObject, initialObject);
+				try {
+					idRegistry.addTranslationModelElement(targetObject, initialObject);
+				} catch (IllegalArgumentException e) {
+					log.warning("Could not add an translation model element to the id registry.", e);
+				}
 			}
 		}
 	}
@@ -331,10 +335,8 @@ public class HenshinTGGTransformation extends ModelTransformation {
 	/**
 	 * Imports model roots into henshin TGG runtime.
 	 *
-	 * @param modelRoot
-	 *            The model root elements
-	 * @param henshinTggFileUri
-	 *            The URI to the Henshin TGG transformation file.
+	 * @param modelRoot         The model root elements
+	 * @param henshinTggFileUri The URI to the Henshin TGG transformation file.
 	 * @return An {@link ImportResult} containing the {@link TripleGraph}, a mapping
 	 *         between Henshin Nodes and eobjects, and a reference to a
 	 *         {@link TGGExecutor}.

Utilities/utils/src/main/java/org/codeling/utils/IDRegistry.java

@@ -34,7 +34,7 @@ public class IDRegistry {
 	public HashMap<String, String[]> getRegistryEntries() {
 		return id2paths;
 	}
-
+int i = 0;
 	private void updateEntry(String id, String codePath, String implementationModelPath, String translationModelPath) {
 		final String[] paths = id2paths.get(id);
 		if (paths == null) {
@@ -77,6 +77,8 @@ public class IDRegistry {
 	 */
 	public void addTranslationModelElement(EObject translationModelElement, EObject implementationModelElement) {
 		final String id = getIDFromImplementationModelElement(implementationModelElement);
+		if(id==null) 
+			throw new IllegalArgumentException("Could not find ID in registry for implementation model element "+implementationModelElement.toString());
 		final String ilPath = getPath(translationModelElement);
 		id2paths.get(id)[2] = ilPath;
 	}