How to use

getEncoder

method

in

org.jpmml.converter.Feature

  @Override
  public Stream<Feature> apply(Feature feature){
    PMMLEncoder encoder = feature.getEncoder();
    if(feature instanceof CategoricalFeature){
      CategoricalFeature categoricalFeature = (CategoricalFeature)feature;
      List<String> values = categoricalFeature.getValues();
      if(!useAllFactorLevels){
        values = values.subList(1, values.size());
      }
      return values.stream()
        .map(value -> new BinaryFeature(encoder, categoricalFeature.getName(), categoricalFeature.getDataType(), value));
    }
    return Stream.of(feature);
  }
};

  @Override
  public Stream<Feature> apply(Feature feature){
    ModelEncoder encoder = (ModelEncoder)feature.getEncoder();
    if(feature instanceof CategoricalFeature){
      CategoricalFeature categoricalFeature = (CategoricalFeature)feature;
      List<String> values = new ArrayList<>(categoricalFeature.getValues());
      values.add("missing(NA)");
      ImputerUtil.encodeFeature(categoricalFeature, "missing(NA)", MissingValueTreatmentMethod.AS_VALUE);
      return values.stream()
        .map(value -> new BinaryFeature(encoder, categoricalFeature.getName(), categoricalFeature.getDataType(), value));
    }
    return Stream.of(feature);
  }
};

  static
  public Feature encodeFeature(Feature feature, Object replacementValue, MissingValueTreatmentMethod missingValueTreatmentMethod){
    ModelEncoder encoder = (ModelEncoder)feature.getEncoder();

    Field<?> field = feature.getField();

    if(field instanceof DataField){
      MissingValueDecorator missingValueDecorator = new MissingValueDecorator()
        .setMissingValueReplacement(ValueUtil.formatValue(replacementValue))
        .setMissingValueTreatment(missingValueTreatmentMethod);

      encoder.addDecorator(feature.getName(), missingValueDecorator);

      return feature;
    } else

    {
      throw new IllegalArgumentException();
    }
  }
}

ModelEncoder encoder = (ModelEncoder)feature.getEncoder();