docs: protected void processReturnTypeOfMethodDeclaration( MethodDeclaration methodDeclaration,
                                                           MethodMetadata methodMetadata ) {
          Type type = methodDeclaration.getReturnType2();
          if (type.isPrimitiveType()) {
              methodMetadata.setReturnType(FieldMetadata.primitiveType(((PrimitiveType)type).getPrimitiveTypeCode().toString()));
          }
          if (type.isSimpleType()) {
              methodMetadata.setReturnType(FieldMetadata.simpleType(JavaMetadataUtil.getName(((SimpleType)type).getName())));
          }
      }