/**
   * Kopiert ein file mittels Steam (Schnelle Mehtode).
   *
   * @param source
   * @param dest
   * @throws IOException
   */
  private void copyFileUsingStream(File source, File dest) throws FileNotFoundException, IOException
  {
    // TODO LaufId impl.
    File tmp = File.createTempFile(laufId, ".tmp", dest.getParentFile());

    byte[] buffer = new byte[1024];
    int len;
    FileInputStream fis = new FileInputStream(source);
    BufferedInputStream bis = new BufferedInputStream(fis);
    FileOutputStream fos = new FileOutputStream(tmp);
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    while ((len = bis.read(buffer)) > -1)
    {
      bos.write(buffer, 0, len);
    }
    bis.close();
    fis.close();
    bos.close();
    fos.close();
    tmp.renameTo(getUniqueFilename(dest));
  }