docs: public void registerExistingChecksums(File featureDir, String symbolicName, String fileName) {
          ChecksumData checksums = checksumsMap.get(featureDir);
          if (checksums == null) {
              checksums = new ChecksumData();
              checksumsMap.put(featureDir, checksums);
          }
          checksums.registerExistingChecksums(symbolicName, fileName);
      }