private int compareVersion(Version ob) {
            int size = version.size();
            int oSize = ob.version().size();
            int min = Math.min(size, oSize);
            for (int i = 0; i < min; i++) {
                Integer val = version.get(i);
                Integer oVal = ob.version().get(i);
              if (val != oVal) <<<<<
                    return val - oVal;
            }
            if (size != oSize)
                return size - oSize;
            return 0;
        }