code: public String getLinkLabel() {
          final FilterOutcome filterOutcome = getFilterOutcome();
          if (filterOutcome != null) {
              return filterOutcome.getCategory() + "";
          }
          final ComponentRequirement req = getRequirement();
          if (req != null) {
              return req.getSimpleName();
          }
          final OutputDataStream outputDataStream = getOutputDataStream();
          if (outputDataStream != null) {
              return outputDataStream.getName();
          }
          return null;
      }
docs: Gets the label (if any) to show towards the user in the {@link JobGraph}.
  
  @return