public void writeFile(Exchange exchange, String fileName)
      throws GenericFileOperationFailedException {
    // build directory if auto create is enabled
    if (endpoint.isAutoCreate()) {
      // we must normalize it (to avoid having both \ and / in the name which confuses java.io.File)
      String name = FileUtil.normalizePath(fileName);

      // use java.io.File to compute the file path
      File file = new File(name);
      String directory = file.getParent();
      boolean absolute = FileUtil.isAbsolute(file);
      if (directory != null) {
        if (!operations.buildDirectory(directory, absolute)) {
          log.debug(
              "Cannot build directory [{}] (could be because of denied permissions)", directory);
        }
      }
    }

    // upload
    if (log.isTraceEnabled()) {
      log.trace(
          "About to write [{}] to [{}] from exchange [{}]",
          new Object[] {fileName, getEndpoint(), exchange});
    }

    boolean success = operations.storeFile(fileName, exchange);
    if (!success) {
      throw new GenericFileOperationFailedException("Error writing file [" + fileName + "]");
    }
    log.debug("Wrote [{}] to [{}]", fileName, getEndpoint());
  }