code: public void setTransformType(TransformType transformType) {
          this.transformType = transformType;
  
          if (contentType == null && transformType != null) {
              if (transformType == TransformType.TEXT) {
                  contentType = ContentType.TEXT_PLAIN.toString();
              } else if (transformType == TransformType.JSON) {
                  contentType = ContentType.TEXT_JSON.toString();
              } else if (transformType == TransformType.XML) {
                  contentType = ContentType.TEXT_XML.toString();
              }
          }
      }
docs: Sets the transform type.
  
  @param transformType the transformType to set