validation - Fixing some ClassNotFoundException when retrieving @Vali…

…datedFor.value()

since in most of cases, plain Class instance won't be available yet at
annotation processing time

Note that current impl has a drawback by relying on com.sun.tools.javac.code
hidden package

restx-core-annotation-processor/src/main/java/restx/annotations/Annotations.java

@@ -0,0 +1,38 @@
+package restx.annotations;
+
+import com.sun.tools.javac.code.Attribute;
+
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.AnnotationValue;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.VariableElement;
+import javax.lang.model.type.DeclaredType;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author fcamblor
+ */
+public class Annotations {
+    public static String[] getAnnotationClassValuesAsFQCN(VariableElement p, Class annotationClazz, String methodName) {
+        List<? extends AnnotationMirror> annotationMirrors = p.getAnnotationMirrors();
+        for(AnnotationMirror annotationMirror : annotationMirrors){
+            if(annotationMirror.getAnnotationType().toString().equals(annotationClazz.getCanonicalName())){
+                for(Map.Entry<? extends ExecutableElement,? extends AnnotationValue> entry : annotationMirror.getElementValues().entrySet()){
+                    if(entry.getKey().getSimpleName().contentEquals(methodName)){
+                        Attribute.Array array = (Attribute.Array) entry.getValue();
+
+                        List<String> fqcns = new ArrayList<>();
+                        for(Attribute attribute : array.getValue()) {
+                            DeclaredType type = (DeclaredType) attribute.getValue();
+                            fqcns.add(type.toString());
+                        }
+                        return fqcns.toArray(new String[fqcns.size()]);
+                    }
+                }
+            }
+        }
+        return null;
+    }
+}

restx-core-annotation-processor/src/main/java/restx/annotations/processor/RestxAnnotationProcessor.java

@@ -176,7 +176,7 @@ private void buildResourceMethodParams(ResourceMethodAnnotation annotation, Reso
 
             String[] validationGroups = new String[0];
             if(validatedFor != null) {
-                validationGroups = Collections2.transform(Arrays.asList(validatedFor.value()), FQN_EXTRACTOR).toArray(new String[0]);
+                validationGroups = Annotations.getAnnotationClassValuesAsFQCN(p, ValidatedFor.class, "value");
             }
 
             resourceMethod.parameters.add(new ResourceMethodParameter(

restx-core/src/main/java/restx/validation/stereotypes/FormValidations.java

@@ -6,6 +6,9 @@
  * @author fcamblor
  */
 public interface FormValidations {
+    public static final String DefaultFQN = "javax.validation.groups.Default";
+    public static final String CreateFQN = "restx.validation.stereotypes.FormValidations.Create";
     public static interface Create extends Default{}
+    public static final String UpdateFQN = "restx.validation.stereotypes.FormValidations.Update";
     public static interface Update extends Default{}
 }