@Override
    public int previousIndex() {
        int i = index;
        while (i > 0) {
            i--;
            if (fieldList.get(i).isToken())
                return i;
        }
        return -1;
    }
A specialized list iterator to manipulate tokens in HitField objects.

@author Steinar Knutsen
container-search/src/main/java/com/yahoo/prelude/hitfield/TokenFieldIterator.java