public InstancePropertyStringFilter withOperator(InstancePropertyFilterOperator operator) {
        this.operator = operator.toString();
        return this;
    }
<p>
The operator used by the filter call.
</p>

@param operator
       The operator used by the filter call.
@return Returns a reference to this object so that method calls can be chained together.
@see InstancePropertyFilterOperator
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/InstancePropertyStringFilter.java