J8583 set Subfields to IsoMessage object

Question

How can I set subfields to an IsoMessage object using the J8583 library? I use the j8583 library for sending ISO8583 messages which require only whole number data element indexes such as fields 7,11 and 12

public void createIsoMessage(){
        MessageFactory<IsoMessage> messageFactory = new MessageFactory<>();
        IsoMessage isoMessage = messageFactory.newMessage(0x800);
        isoMessage.setValue(7, "0601163045", IsoType.DATE10, 10);
        isoMessage.setValue(11, "163045", IsoType.DATE10, 6);
        isoMessage.setValue(12, "163045", IsoType.DATE10, 6);
    }

But I need to send data elements that have subfields such as fields: 127.2 127.3 127.12 127.25.3 127.25.4, however I can only set integer data element indexes using the setValue() function

I need to be able to set data elements, particularly data element 127, that have subfields to be able to send ICCDATA which is required by the payment processor.

Answer 1

This is from the j8583 doc

You can also create a CompositeField, store several subfields inside it, and store it in any field inside an IsoMessage, specifying the same instance as the CustomField:

CompositeField f = new CompositeField().addValue(new IsoValue<String>(IsoType.ALPHA, "one", 5))
    .addValue(new IsoValue<String>(IsoType.LLVAR, "two"))
    .addValue(new IsoValue<Long>(IsoType.NUMERIC, 123l, 6))
    .addValue(new IsoValue<String>(IsoType.ALPHA, "OK", 2));
message.setValue(125, f, f, IsoType.LLLVAR, 0);