전역 BigDecimal 도구 클래스 (데이터 대비 및 가격 계산)

public class BigDecimalUtil {

    /**
     *            2
     */
    public static final int PRICE_DECIMAL_POINT = 2;

    /**
     *            6
     */
    public static final int SIX_PRICE_DECIMAL_POINT = 6;

    /**
     *           3
     */
    public static final int WEIGHT_DECIMAL_POINT = 3;

    /**
     *         ：       2    
     */
    public static class Amount {

        public static BigDecimal add(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.add(num2), PRICE_DECIMAL_POINT);
        }
        public static BigDecimal multiply(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.multiply(num2), PRICE_DECIMAL_POINT);
        }
        public static BigDecimal subtract(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.subtract(num2), PRICE_DECIMAL_POINT);
        }
        public static BigDecimal divide(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.divide(num2, RoundingMode.HALF_UP), PRICE_DECIMAL_POINT);
        }
    }

    /**
     *         ：       2    
     */
    public static class AmountSix {

        public static BigDecimal add(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.add(num2), SIX_PRICE_DECIMAL_POINT);
        }
        public static BigDecimal multiply(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.multiply(num2), SIX_PRICE_DECIMAL_POINT);
        }
        public static BigDecimal subtract(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.subtract(num2), SIX_PRICE_DECIMAL_POINT);
        }
        public static BigDecimal divide(BigDecimal num1, BigDecimal num2) {
            return num1.divide(num2, PRICE_DECIMAL_POINT, RoundingMode.HALF_UP);
        }
    }

    /**
     *         ：       3    
     */
    public static class Weight {

        public static BigDecimal add(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.add(num2), WEIGHT_DECIMAL_POINT);
        }
        public static BigDecimal multiply(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.multiply(num2), WEIGHT_DECIMAL_POINT);
        }
        public static BigDecimal subtract(BigDecimal num1, BigDecimal num2) {
            return setScale(num1.subtract(num2), WEIGHT_DECIMAL_POINT);
        }
        public static BigDecimal divide(BigDecimal num1, BigDecimal num2) {
            return num1.divide(num2, WEIGHT_DECIMAL_POINT, RoundingMode.HALF_UP);
        }
    }

    /**
     * BigDecimal    num1 + num2
     *       
     *
     * @param num1
     * @param num2
     * @param point    BigDecimalUtils.PRICE_DECIMAL_POINT | BigDecimalUtils.WEIGHT_DECIMAL_POINT
     * @return BigDecimal
     */
    public static BigDecimal add(BigDecimal num1, BigDecimal num2, int point) {
        return setScale(num1.add(num2), point);
    }

    /**
     * BigDecimal    num1 x num2
     *       
     *
     * @param num1
     * @param num2
     * @param point    BigDecimalUtils.PRICE_DECIMAL_POINT | BigDecimalUtils.WEIGHT_DECIMAL_POINT
     * @return BigDecimal
     */
    public static BigDecimal multiply(BigDecimal num1, BigDecimal num2, int point) {
        return setScale(num1.multiply(num2), point);
    }

    /**
     * BigDecimal    num1 - num2
     *       
     *
     * @param num1
     * @param num2
     * @param point    BigDecimalUtils.PRICE_DECIMAL_POINT | BigDecimalUtils.WEIGHT_DECIMAL_POINT
     * @return BigDecimal
     */
    public static BigDecimal subtract(BigDecimal num1, BigDecimal num2, int point) {
        return setScale(num1.subtract(num2), point);
    }

    /**
     * BigDecimal    num1/num2
     *       
     *
     * @param num1
     * @param num2
     * @param point    BigDecimalUtils.PRICE_DECIMAL_POINT | BigDecimalUtils.WEIGHT_DECIMAL_POINT
     * @return BigDecimal
     */
    public static BigDecimal divide(BigDecimal num1, BigDecimal num2, int point) {
        return num1.divide(num2, point, RoundingMode.HALF_UP);
    }

    /**
     *              
     *
     * @param num
     * @param point
     * @return BigDecimal
     */
    public static BigDecimal setScale(BigDecimal num, int point) {
        return num.setScale(point, RoundingMode.HALF_UP);
    }

    /**
     *    num1      num2
     *
     * @param num1
     * @param num2
     * @return boolean
     */
    public static boolean isGreaterThan(BigDecimal num1, BigDecimal num2) {
        return num1.compareTo(num2) == 1;
    }

    /**
     *    num1        num2
     *
     * @param num1
     * @param num2
     * @return boolean
     */
    public static boolean isGreaterOrEqual(BigDecimal num1, BigDecimal num2) {
        return isGreaterThan(num1, num2) || equals(num1, num2);
    }

    /**
     *    num1      num2
     *
     * @param num1
     * @param num2
     * @return boolean
     */
    public static boolean isLessThan(BigDecimal num1, BigDecimal num2) {
        return num1.compareTo(num2) == - 1;
    }

    /**
     *    num1        num2
     *
     * @param num1
     * @param num2
     * @return boolean
     */
    public static boolean isLessOrEqual(BigDecimal num1, BigDecimal num2) {
        return isLessThan(num1, num2) || equals(num1, num2);
    }

    /**
     *    num1      num2
     *
     * @param num1
     * @param num2
     * @return
     */
    public static boolean equals(BigDecimal num1, BigDecimal num2) {
        return num1.compareTo(num2) == 0;
    }

    /**
     *    num1 / num2     
     *
     * @param num1
     * @param num2
     * @return String
     */
    public static String getPercentage(BigDecimal num1, BigDecimal num2) {
        BigDecimal result = num1.divide(num2, 4, RoundingMode.HALF_UP);
        NumberFormat percent = NumberFormat.getPercentInstance();
        percent.setMaximumFractionDigits(2);
        return percent.format(result.doubleValue());
    }

    /**
     *    num1 / num2     
     *
     * @param num1
     * @param num2
     * @param point       
     * @return String
     */
    public static BigDecimal bigDecimalPercent(Integer num1, Integer num2, int point) {
        if (num1 == null || num2 == null) {
            return BigDecimal.ZERO;
        }
        if (num2.equals(Integer.valueOf(0))) {
            return BigDecimal.ZERO;
        }
        BigDecimal bigDecimalNum1 = new BigDecimal(num1);
        BigDecimal bigDecimalNum2 = new BigDecimal(num2);
        return bigDecimalPercent(bigDecimalNum1, bigDecimalNum2, point);
    }

    /**
     *    num1 / num2     
     *
     * @param num1
     * @param num2
     * @param point       
     * @return String
     */
    public static BigDecimal bigDecimalPercent(BigDecimal num1, BigDecimal num2, int point) {
        if (num1 == null || num2 == null) {
            return BigDecimal.ZERO;
        }
        if (equals(BigDecimal.ZERO, num2)) {
            return BigDecimal.ZERO;
        }
        BigDecimal percent = num1.divide(num2, point + 2, RoundingMode.HALF_UP);
        BigDecimal percent100 = percent.multiply(new BigDecimal(100)).setScale(point);
        return percent100;
    }

    /**
     *   num         
     *
     * @param num
     * @return String
     */
    public static Boolean isEmpty(BigDecimal num) {
        return null == num || equals(BigDecimal.ZERO, num);
    }

    /**
     *   num      null       
     *
     * @param num
     * @return String
     */
    public static Boolean isNotEmpty(BigDecimal num) {
        return ! isEmpty(num);
    }

    /**
     *     
     *
     * @param num
     * @param point
     * @return
     */
    public static BigDecimal convertTenThousand(BigDecimal num, int point) {
        BigDecimal decimal = num.divide(new BigDecimal(10000), point, RoundingMode.HALF_UP);
        return decimal;
    }

    /**
     *      
     *
     * @param num
     * @return
     */
    public static BigDecimal convertToMinusNumber(BigDecimal num) {
        if (isLessOrEqual(num, BigDecimal.ZERO)) {
            return num;
        }
        return BigDecimal.ZERO.subtract(num);
    }

}