Annotations: Add util method to get IAnnotationValueProviders.

* Useful to retrieve values, labels etc. 

Issue-Ref: 3209
Issue-Url: https://af3-developer.fortiss.org/issues/3209


Signed-off-by: Alexander Diewald <diewald@fortiss.org>

org.fortiss.tooling.base/src/org/fortiss/tooling/base/utils/.ratings

 AngleUtils.java 462551eae71738ff51f92c9906bff9a21a375d2b GREEN
-AnnotationUtils.java 51072e0c39c83fc5695db76ffaaa430c2ce51508 GREEN
+AnnotationUtils.java 8381bc9190df78f69add1164b974a6cbaae09678 RED
 BaseMathUtils.java d680e6f41a8986e5fb696fe303b16548108cf78b GREEN
 BaseModelElementUtils.java b8775b7a462efc168cf79a017aa3377a782d10f6 GREEN
 ConstraintsBaseUtils.java ef6a1178df614fc03bbdec64d4d15b1565ae8551 GREEN

org.fortiss.tooling.base/src/org/fortiss/tooling/base/utils/AnnotationUtils.java

@@ -34,6 +34,8 @@ import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EClassifier;
 import org.eclipse.emf.ecore.util.EcoreUtil;
 import org.fortiss.tooling.base.ToolingBaseActivator;
+import org.fortiss.tooling.base.annotation.AnnotationEntry;
+import org.fortiss.tooling.base.annotation.AnnotationValueService;
 import org.fortiss.tooling.base.annotation.IAnnotationValueService;
 import org.fortiss.tooling.base.annotation.valueprovider.AnnotationInstSpec;
 import org.fortiss.tooling.base.annotation.valueprovider.EStructuralFeatureDescriptor;
@@ -138,6 +140,22 @@ public class AnnotationUtils {
 		return getAnnotationInternal(modelElement, clazz);
 	}
 
+	/**
+	 * Returns the {@link IAnnotationValueProvider} of the given {@code annotationType}.
+	 * 
+	 * @param element
+	 *            {@link IModelElement} to which an annotation of the given type is bound (required
+	 *            by the service).
+	 * @param annotationType
+	 *            Annotation type.
+	 * @return The corresponding value provider or {@code null} if none is found.
+	 */
+	public static IAnnotationValueProvider<IAnnotatedSpecification> getAnnotationValueProvider(
+			IModelElement element, Class<IAnnotatedSpecification> annotationType) {
+		AnnotationEntry annEntry = AnnotationValueService.getInstance().getAnnotationEntry(element);
+		return annEntry.getAnnotationValueProvider(annotationType);
+	}
+
 	/**
 	 * Returns all {@link IAnnotatedSpecification}s attached to the given {@link IModelElement}.
 	 *