Java BigDecimal Round roundToMSDecimal(BigDecimal sourceDecimal)

Description

round To MS Decimal

License

Open Source License

Declaration

public static BigDecimal roundToMSDecimal(BigDecimal sourceDecimal) 

Method Source Code

//package com.java2s;
/* Copyright (C) 2016 Advanced Digital Science Centre

 * This file is part of Soft-Grid./*  www .j  a v a2  s  .  co  m*/
 * For more information visit https://www.illinois.adsc.com.sg/cybersage/
 *
 * Soft-Grid is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Soft-Grid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Soft-Grid.  If not, see <http://www.gnu.org/licenses/>.

 * @author Prageeth Mahendra Gunathilaka
 */

import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.MathContext;

public class Main {
    private static final BigDecimal LARGEST_DECIMAL = new BigDecimal(
            new BigInteger("ffffffffffffffffffffffff", 16));
    private static final BigDecimal SMALLEST_DECIMAL = new BigDecimal(
            (new BigInteger("ffffffffffffffffffffffff", 16)).negate());

    public static BigDecimal roundToMSDecimal(BigDecimal sourceDecimal) {
        BigInteger sourceDecimalIntComponent = sourceDecimal
                .unscaledValue();
        BigDecimal destinationDecimal = new BigDecimal(
                sourceDecimalIntComponent, sourceDecimal.scale());
        byte roundingModel = 4;
        validateDecimalMinMax(destinationDecimal);
        BigInteger allWordBigInt = destinationDecimal.unscaledValue();
        if (allWordBigInt.bitLength() > 96) {
            destinationDecimal = destinationDecimal.round(new MathContext(
                    29));
            if (allWordBigInt.bitLength() > 96) {
                destinationDecimal = destinationDecimal
                        .round(new MathContext(28));
            }
        }

        if (destinationDecimal.scale() > 28) {
            destinationDecimal = destinationDecimal.setScale(28,
                    roundingModel);
        }

        if (destinationDecimal.scale() < 0) {
            destinationDecimal = destinationDecimal.setScale(0,
                    roundingModel);
        }

        return destinationDecimal;
    }

    protected static void validateDecimalMinMax(BigDecimal in) {
        if (in == null) {
            throw new IllegalArgumentException(
                    "null is not a supported Decimal value.");
        } else if (LARGEST_DECIMAL.compareTo(in) < 0) {
            throw new IllegalArgumentException(
                    "Value too large for VT_DECIMAL data type:"
                            + in.toString() + " integer: "
                            + in.toBigInteger().toString(16) + " scale: "
                            + in.scale());
        } else if (SMALLEST_DECIMAL.compareTo(in) > 0) {
            throw new IllegalArgumentException(
                    "Value too small for VT_DECIMAL data type:"
                            + in.toString() + " integer: "
                            + in.toBigInteger().toString(16) + " scale: "
                            + in.scale());
        }
    }
}

Related

1. roundImpl(final BigDecimal number, final int minFractionDigits, final int maxFractionDigits, final RoundingMode mode)
2. roundingError(final BigDecimal dividend, final BigDecimal divisor, final int roundingMode)
3. roundOff(final BigDecimal amount)
4. roundPrice(BigDecimal price, BigDecimal ticksize)
5. roundTo(final BigDecimal bd, final int numberOfDecPlaces, final int finalScale)
6. roundUp1(BigDecimal number)
7. valueOfBigDecimalRounding(double d1, int decimalPrecision)