How to use

ofLeft

method

in

org.kie.dmn.feel.util.Either

public static PropertyValueResult notDefined() {
  return new PropertyValueResult(false, Either.ofLeft(new UnsupportedOperationException("Property was not defined.")));
}

/**
 * If valid input values are defined, check that all parameters match the respective valid inputs
 * @param ctx
 * @param params
 * @return
 */
private Either<FEELEvent, Object> actualInputsMatchInputValues(EvaluationContext ctx, Object[] params) {
  // check that all the parameters match the input list values if they are defined
  for( int i = 0; i < params.length; i++ ) {
    final DTInputClause input = inputs.get( i );
    // if a list of values is defined, check the the parameter matches the value
    if ( input.getInputValues() != null && ! input.getInputValues().isEmpty() ) {
      final Object parameter = params[i];
      boolean satisfies = input.getInputValues().stream().map( ut -> ut.apply( ctx, parameter ) ).filter( Boolean::booleanValue ).findAny().orElse( false );
      if ( !satisfies ) {
        String values = input.getInputValuesText();
        return Either.ofLeft(new InvalidInputEvent( FEELEvent.Severity.ERROR,
                       input.getInputExpression()+"='" + parameter + "' does not match any of the valid values " + values + " for decision table '" + getName() + "'.",
                       getName(),
                       null,
                       values )
            );
      }
    }
  }
  return Either.ofRight(true);
}

} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
  e.printStackTrace();
  return PropertyValueResult.of(Either.ofLeft(e));