text: public KeepWordFilterFactory(IDictionary<string, string> args): base(args){AssureMatchVersion();wordFiles = Get(args, "words");ignoreCase = GetBoolean(args, "ignoreCase", false);enablePositionIncrements = GetBoolean(args, "enablePositionIncrements", true);if (args.Count > 0){throw new System.ArgumentException("Unknown parameters: " + args);}}