Hi, I want to use OptInputParInfo.Type.CURRENCY in my custom indicator. But I can't compile it because I don't know which OptInputDescription has to be assigned. There are only these description types
DoubleListDescription, DoubleRangeDescription, IntegerListDescription, IntegerRangeDescription

so which of them shall I use to solve my problem?

thanks

Hi,
to pass currency as optional parameter don't use OptInputParInfo.Type.CURRENCY.
Bellow is sample with modified "ENTROPY" indicator, which demonstrates how to pass an enum to the indicator.
Please consider this sample:

    
            .    .    .
public void onStart(IIndicatorContext context) {
        indicatorInfo = new IndicatorInfo("ENTROPY", "Calculates entropy number", "My indicators",
                false, false, false, 1, 2, 1);
        inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Input data", InputParameterInfo.Type.DOUBLE)};
        
        int[] vals = new int[Currency.values().length];
        String[] valNames = new String[Currency.values().length];
        int i = 0;

        //prepare arrays to define currency's list
        for (Currency cur : Currency.values()){
           vals[i] = cur.ordinal();
           valNames[i] = cur.name();
           i++;
        }
        
        optInputParameterInfos = new OptInputParameterInfo[] 
                     {new OptInputParameterInfo("Time period", OptInputParameterInfo.Type.OTHER, new IntegerRangeDescription(2, 2, 100, 1)),
                      //use OptInputParameterInfo type OTHER 
                      new OptInputParameterInfo("Currency", OptInputParameterInfo.Type.OTHER, new IntegerListDescription(1,  vals, valNames))
                     };
        outputParameterInfos = new OutputParameterInfo[] {new OutputParameterInfo("out", OutputParameterInfo.Type.DOUBLE,
                OutputParameterInfo.DrawingStyle.LINE)};
    }
            .    .    .
    public void setOptInputParameter(int index, Object value) {
       if (index == 1){
          for (Currency cur : Currency.values()){
             if(cur.ordinal() == (Integer)value)
                                //verify that an indicator have correct value
                System.out.println(" cur: "+cur.name());                
          }
                    
       }
        timePeriod = (Integer) value;
        
    }

And here is, how you can call it from strategy

context.getIndicators().calculateIndicator(instrument,                         
                period,
                new OfferSide[] {OfferSide.BID},
                "ENTROPY",
                new IIndicators.AppliedPrice[] {IIndicators.AppliedPrice.CLOSE},
                new Object[]{1, Currency.USD.ordinal()},                
                 1); 

If you still have question, please do not hesitate to ask.