docs: public ExcelWriter setHeaderOrFooter(String text, Align align, boolean isFooter) {
  		final HeaderFooter headerFooter = isFooter ? this.sheet.getFooter() : this.sheet.getHeader();
  		switch (align) {
  		case LEFT:
  			headerFooter.setLeft(text);
  			break;
  		case RIGHT:
  			headerFooter.setRight(text);
  			break;
  		case CENTER:
  			headerFooter.setCenter(text);
  			break;
  		default:
  			break;
  		}
  		return this;
  	}