docs: public void padField(String sourceField, String targetField, String length, String character, String direction) {
          TransformationStep step = new TransformationStep();
          step.setSourceFields(sourceField);
          step.setTargetField(targetField);
          step.setOperationParameter(TransformationConstants.PAD_LENGTH_PARAM, length);
          step.setOperationParameter(TransformationConstants.PAD_CHARACTER_PARAM, character);
          step.setOperationParameter(TransformationConstants.PAD_DIRECTION_PARAM, direction);
          step.setOperationName("pad");
          steps.add(step);
      }