code: public static String commentLine( String line ) {
  
  		String result = line;
  		if( ! Utils.isEmptyOrWhitespaces( line )
  				&& ! line.trim().startsWith( ParsingConstants.COMMENT_DELIMITER ))
  			result = ParsingConstants.COMMENT_DELIMITER + line;
  
  		return result;
  	}
docs: Comments a line.
  @param line a non-null line
  @return a non-null line