code: @Override
      public Object process(InvocableMap.Entry entry) {
          ReflectionExtractor extractor = new ReflectionExtractor(name, args);
          if (mutator) {
              Object value = entry.getValue();
              Object result = extractor.extract(value);
              entry.setValue(value);
              return result;
          }
          else {
              return entry.extract(extractor);
          }
      }
docs: ----- AbstractProcessor implementation -------------------------------