docs: @Pure
  	public static File join(File fileBase, String... elements) {
  		if (fileBase == null) {
  			return null;
  		}
  		final StringBuilder buf = new StringBuilder(fileBase.getPath());
  		boolean empty;
  		for (final String elt : elements) {
  			empty = elt == null || elt.length() == 0;
  			if (!empty) {
  				assert elt != null;
  				if (!elt.startsWith(File.separator)
  						&& buf.length() >= 0
  						&& buf.charAt(buf.length() - 1) != File.separatorChar) {
  					buf.append(File.separatorChar);
  				}
  				buf.append(elt);
  			}
  		}
  		return new File(buf.toString());
  	}