public RuleVerdictExpression withOperator(RuleVerdictOperator operator) {
        this.operator = operator.toString();
        return this;
    }
<p>
The matching operator for a verdict condition expression.
</p>

@param operator
       The matching operator for a verdict condition expression.
@return Returns a reference to this object so that method calls can be chained together.
@see RuleVerdictOperator
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/RuleVerdictExpression.java