code: public String getHash(Algorithms alg) {
          String key = normalizeKey(alg);
          if (hashes.containsKey(key)) {
              Record record = hashes.get(key);
              if (record.containsKey(FieldName.COMBINED_HASH)) {
                  return (String) record.get(FieldName.COMBINED_HASH);
              }
          }
          return "";
      }
docs: Get the combined/file hash for this record.
  
  @param alg
  The hashing algorithm.
  @return The hash(alg,file), if the hash for the provided algorithm exists
  else returns ""