docs: public void marshall(ConditionCheck conditionCheck, ProtocolMarshaller protocolMarshaller) {
  
          if (conditionCheck == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(conditionCheck.getKey(), KEY_BINDING);
              protocolMarshaller.marshall(conditionCheck.getTableName(), TABLENAME_BINDING);
              protocolMarshaller.marshall(conditionCheck.getConditionExpression(), CONDITIONEXPRESSION_BINDING);
              protocolMarshaller.marshall(conditionCheck.getExpressionAttributeNames(), EXPRESSIONATTRIBUTENAMES_BINDING);
              protocolMarshaller.marshall(conditionCheck.getExpressionAttributeValues(), EXPRESSIONATTRIBUTEVALUES_BINDING);
              protocolMarshaller.marshall(conditionCheck.getReturnValuesOnConditionCheckFailure(), RETURNVALUESONCONDITIONCHECKFAILURE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }