Object类型转BigDecimal(方法)

public static BigDecimal getBigDecimal(Object value) {
    BigDecimal ret = null;
    if (value != null) {
        if (value instanceof BigDecimal) {
            ret = (BigDecimal) value;
        } else if (value instanceof String) {
            ret = new BigDecimal((String) value);
        } else if (value instanceof BigInteger) {
            ret = new BigDecimal((BigInteger) value);
        } else if (value instanceof Number) {
            ret = new BigDecimal(((Number) value).doubleValue());
        } else {
            throw new ClassCastException("Not possible to coerce [" + value + "] from class " + value.getClass() + " into a BigDecimal.");
        }
    }
    return ret;
}