new utility method

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EMFResourceUtils.java

@@ -41,7 +41,7 @@ import org.fortiss.tooling.kernel.ToolingKernelActivator;
  * @author hoelzl
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating GREEN Hash: 05A7E1EF00860F1627C27B2E7E6675A9
+ * @ConQAT.Rating YELLOW Hash: 56BD3983999FF36819DDEDE7854E36EF
  */
 public final class EMFResourceUtils {
 	/**
@@ -112,6 +112,41 @@ public final class EMFResourceUtils {
 		return null;
 	}
 
+	/**
+	 * Loads the root model element from the given {@link URI}. Logs errors to the console and
+	 * returns <code>null</code>.
+	 * 
+	 * @param uri
+	 *            the resource {@link URI}.
+	 * @param topLevelClass
+	 *            the type of the top level class to be returned
+	 * @return the root {@link EObject} of class type topLevelClass (first root which is found of
+	 *         this type is returned)
+	 */
+	public static Pair<EObject, Map<EObject, AnyType>> loadModelFromFileWithUnknownFeatures(
+			URI uri, Class<?> topLevelClass) {
+		try {
+			ResourceSet rset = new ResourceSetImpl();
+			Resource r;
+			r = rset.createResource(uri);
+			r.load(EMFResourceUtils.buildOptionsMap());
+			Map<EObject, AnyType> unknownFeatures =
+					r instanceof XMIResource ? ((XMIResource)r).getEObjectToExtensionMap()
+							: new HashMap<EObject, AnyType>();
+			if(!r.getContents().isEmpty()) {
+
+				for(EObject content : r.getContents()) {
+					if(topLevelClass.isAssignableFrom(content.getClass()))
+						return new Pair<EObject, Map<EObject, AnyType>>(content, unknownFeatures);
+				}
+			}
+		} catch(IOException ex) {
+			error(ToolingKernelActivator.getDefault(),
+					"Failed to load model from " + uri.toString(), ex);
+		}
+		return null;
+	}
+
 	/**
 	 * Loads the root model element from the given {@link URI}. Logs errors to the console and
 	 * returns <code>null</code>.