@Override
  public void addLocalizationFile(
      final String domainId,
      final String locale,
      final InputStream inputStream,
      final boolean overwrite)
      throws DomainStorageException {
    if (logger.isDebugEnabled()) {
      logger.debug("addLocalizationFile(" + domainId + ", " + locale + ", inputStream)");
    }
    if (null != inputStream) {
      if (StringUtils.isEmpty(domainId) || StringUtils.isEmpty(locale)) {
        throw new IllegalArgumentException(
            messages.getErrorString(
                "PentahoMetadataDomainRepository.ERROR_0004_DOMAIN_ID_INVALID", domainId));
      }

      lock.writeLock().lock();
      try {
        // Check for duplicates
        final RepositoryFile localeFile = metadataMapping.getLocaleFile(domainId, locale);
        if (!overwrite && localeFile != null) {
          throw new DomainStorageException(
              messages.getErrorString(
                  "PentahoMetadataDomainRepository.ERROR_0009_LOCALE_ALREADY_EXISTS",
                  domainId,
                  locale),
              null);
        }

        final SimpleRepositoryFileData data =
            new SimpleRepositoryFileData(inputStream, DEFAULT_ENCODING, LOCALE_MIME_TYPE);
        if (localeFile == null) {
          final RepositoryFile newLocaleFile = createUniqueFile(domainId, locale, data);
          metadataMapping.addLocale(domainId, locale, newLocaleFile);
        } else {
          repository.updateFile(localeFile, data, null);
        }
        // This invalidates any cached information
        flushDomains();
      } finally {
        lock.writeLock().unlock();
      }
    }
  }