Template that compares field type

Hi.

In the template, how could I create a @if statement that checks the $field type against List, Collections and Set?

I am trying to adapt the current generate getter template to handle collections in a differente way.

Instead of:
  public List<X> getListOfX() {
     return listOfX;
  }

I would like to generate:
  public List<X> getListOfX() {
    return Collections.unmodifiableList(listOfX);
  }

I could not find a documentation about this.

Best regards,

Daniel Felix Ferber