index = (depth != 0) ? v.context[0] : v.rootIndex;
index = (depth != 0) ? v.context[depth] : v.rootIndex;
    public void touch(VTDNav v) {        if (v == null)            throw new IllegalArgumentException(" VTDNav instance can't be null");        depth = v.context[0];        index = (depth != 0) ? v.context[0] : v.rootIndex;        vn = v;        prevLocation = -1;        lcIndex = -1;        lcUpper = -1;        lcLower = -1;    }