text: public QueryNode process(QueryNode queryTree) throws QueryNodeException {Operator op = getQueryConfigHandler().get(ConfigurationKeys.DEFAULT_OPERATOR);if (op == null) {throw new IllegalArgumentException("StandardQueryConfigHandler.ConfigurationKeys.DEFAULT_OPERATOR should be set on the QueryConfigHandler");}this.usingAnd = StandardQueryConfigHandler.Operator.AND == op;return super.process(queryTree);}