docs: @SuppressWarnings("static-method")
  	protected String buildMessage(double progress, String comment, boolean isRoot, boolean isFinished,
  			NumberFormat numberFormat) {
  		final StringBuilder txt = new StringBuilder();
  		txt.append('[');
  		txt.append(numberFormat.format(progress));
  		txt.append("] "); //$NON-NLS-1$
  		if (comment != null) {
  			txt.append(comment);
  		}
  		return txt.toString();
  	}