Get annotation value provider based on columns annotation type

Issue-Ref: 4140
Issue-Url: #4140

Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/.ratings

 AnnotationFxViewPart.java ca1548c49aa3842a9436262531464ba345b83688 GREEN
-AnnotationTreeTableUIProvider.java 4d9ea9f5267e1a04985c5f67e748f34474c97e0f GREEN
+AnnotationTreeTableUIProvider.java 8a6be639582f761db85908cca42533ab9289808d YELLOW
 AnnotationViewFXController.java 87d70534cde579cbd5f6470e729783306a139324 GREEN
 AnnotationsFXUtils.java 754152735e037da59a4c40fa045602c3ed85a40f GREEN
 ColumnHandle.java 761c2517b3f3e4725feb7ce7e8d5927ba191a4bb GREEN

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/AnnotationTreeTableUIProvider.java

@@ -19,6 +19,7 @@ import static org.fortiss.tooling.base.ui.annotation.view.fx.AnnotationsFXUtils.
 import static org.fortiss.tooling.base.ui.annotation.view.fx.AnnotationsFXUtils.getBackgroundColorForEntry;
 
 import org.fortiss.tooling.base.annotation.AnnotationEntry;
+import org.fortiss.tooling.base.annotation.IAnnotationValueService;
 import org.fortiss.tooling.base.annotation.valueprovider.IAnnotationValueProvider;
 import org.fortiss.tooling.base.model.element.IAnnotatedSpecification;
 import org.fortiss.tooling.base.model.element.IModelElement;
@@ -97,12 +98,21 @@ import javafx.scene.paint.Color;
 
 	/** {@inheritDoc} */
 	@Override
-	public boolean isEditable(int column, AnnotationEntry element) {
+	public boolean isEditable(int column, AnnotationEntry ae) {
 		if(column > 1 && this.viewController.colIdxAnnotationMap.containsKey(column)) {
+			ColumnHandle<IAnnotatedSpecification> columnHandle =
+					this.viewController.colIdxAnnotationMap.get(column);
+
+			// Get annotation value provider for specification associated to given annotation entry
+			Class<IAnnotatedSpecification> specType = columnHandle.getAnnotatedSpecificationType();
+			IAnnotationValueService as = IAnnotationValueService.getInstance();
 			IAnnotatedSpecification spec =
-					this.viewController.colIdxAnnotationMap.get(column).getAnnotatedSpecification();
+					as.getAnnotationEntry(ae.getModelElement()).getSpecification(specType);
+
+			// Check 'editable' predicate for specification/annotation contained by model element
+			// associated to given annotation entry (if it exists)
 			IAnnotationValueProvider<IAnnotatedSpecification> valueProvider =
-					element.getAnnotationValueProvider(spec.getClass());
+					spec != null ? ae.getAnnotationValueProvider(spec.getClass()) : null;
 			return valueProvider != null && valueProvider.canEdit(spec);
 		}