docs: public Evaluator getEvaluator( ValueType type,
                                     String operatorId,
                                     boolean isNegated,
                                     String parameterText ) {
          return this.getEvaluatorDefinition( operatorId ).getEvaluator( type,
                                                                         operatorId,
                                                                         isNegated,
                                                                         parameterText );
      }