return Long.toString(value);
        }
    }

    /**
     * Represents a numeric item in the version item list.
     */
    private static class BigIntegerItem implements Item {
        private final BigInteger value;

        BigIntegerItem(String str) {
            this.value = new BigInteger(str);
        }

        @Override
        public int getType() {
            return BIGINTEGER_ITEM;