text: public TruncateTokenFilterFactory(Map<String, String> args) {super(args);prefixLength = Byte.parseByte(get(args, PREFIX_LENGTH_KEY, "5"));if (prefixLength < 1)throw new IllegalArgumentException(PREFIX_LENGTH_KEY + " parameter must be a positive number: " + prefixLength);if (!args.isEmpty()) {throw new IllegalArgumentException("Unknown parameter(s): " + args);}}