static void init() {
   if (Operator.determineOperator(isAOp, false) == null) {
     ISA = Operator.addOperatorToRegistry(isAOp, false);
     NOT_ISA = Operator.addOperatorToRegistry(isAOp, true);
     SUPPORTED_IDS = new String[] {isAOp};
   }
 }
 /** @inheridDoc */
 public Evaluator getEvaluator(ValueType type, Operator operator, String parameterText) {
   return this.getEvaluator(
       type, operator.getOperatorString(), operator.isNegated(), parameterText);
 }
 /** @inheridDoc */
 public Evaluator getEvaluator(ValueType type, Operator operator) {
   return this.getEvaluator(type, operator.getOperatorString(), operator.isNegated(), null);
 }