@Override
 public void saveCategory(CategoryData categoryData) {
   if (categoryData.getParentCategory() == null)
     categoryService.addCategory(categoryData.getCategoryEntity());
   else {
     Category parent =
         categoryService.find(UUIDHelper.stringToUUID(categoryData.getParentCategory().getUuid()));
     Category child =
         new Category(
             UUIDHelper.stringToUUID(categoryData.getUuid()),
             categoryData.getCategoryName(),
             parent);
     categoryService.addCategory(child);
     categoryService.addParentCategory(
         child.getUuid(), UUIDHelper.stringToUUID(categoryData.getParentCategory().getUuid()));
   }
 }