Custom Form Field Type for file upload

Camunda 7 Topics Discussion & Questions
2

Answering my own question here in case in case it’s useful for anyone else in the future:

I followed the instructions here to register a custom form type FileFormFieldType.
And then my implementation of the class FileFormFieldType looks something like this:

public class FileFormFieldType extends SimpleFormFieldType {

    public final static String FORM_TYPE = "file";

    @Override
    public String getName() {
        return FORM_TYPE;
    }

    public TypedValue convertValue(TypedValue propertyValue) {
        if(propertyValue instanceof FileValue) {
            return propertyValue;
        } else {
            Object value = propertyValue.getValue();
            if(value == null) {
                return Variables.fileValue("null").create();
            } else {
                return Variables.fileValue((File) value);
            }
        }
    }

    @Override
    public Object convertFormValueToModelValue(Object propertyValue) {
        return null;
    }

    @Override
    public String convertModelValueToFormValue(Object modelValue) {
        return null;
    }
}