@Override
        public Builder variable(String variable) {
            this.variable = variable;
            return this;
        }
Sets the JSONPath expression that determines which piece of the input document is used for the comparison.

@param variable Reference path.
@return This object for method chaining.
aws-java-sdk-stepfunctions/src/main/java/com/amazonaws/services/stepfunctions/builder/conditions/TimestampLessThanCondition.java