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MonetaryFormat: use BigDecimal for converting satishos to number and decimals

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This gets rid of Guava `LongMath`. It also adds comments to the individual
conversion steps.
This commit is contained in:
Andreas Schildbach 2023-03-17 13:22:40 +01:00
parent 9606900551
commit 80178c011c
1 changed files with 11 additions and 10 deletions
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21
core/src/main/java/org/bitcoinj/base/utils/MonetaryFormat.java
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@ -19,6 +19,7 @@ package org.bitcoinj.base.utils;
import org.bitcoinj.base.Coin;
import org.bitcoinj.base.Monetary;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormatSymbols;
import java.util.ArrayList;
@ -27,8 +28,6 @@ import java.util.List;
import java.util.Locale;
import java.util.Objects;
import static com.google.common.math.LongMath.checkedPow;
import static com.google.common.math.LongMath.divide;
import static org.bitcoinj.base.internal.Preconditions.checkArgument;
import static org.bitcoinj.base.internal.Preconditions.checkState;
@ -438,15 +437,17 @@ public final class MonetaryFormat {
*/
private static DecimalNumber satoshisToDecimal(long satoshis, RoundingMode roundingMode, int decimalShift,
int maxVisibleDecimals) {
// rounding
long precisionDivisor = checkedPow(10, decimalShift - maxVisibleDecimals);
long roundedSatoshsis = Math.multiplyExact(divide(satoshis, precisionDivisor, roundingMode), precisionDivisor);
// shifting
long shiftDivisor = checkedPow(10, decimalShift);
BigDecimal decimalSats = BigDecimal.valueOf(satoshis);
// shift the decimal point
decimalSats = decimalSats.movePointLeft(decimalShift);
// discard unwanted precision and round accordingly
decimalSats = decimalSats.setScale(maxVisibleDecimals, roundingMode);
// separate decimals from the number
BigDecimal[] separated = decimalSats.divideAndRemainder(BigDecimal.ONE);
return new DecimalNumber(
roundedSatoshsis / shiftDivisor,
roundedSatoshsis % shiftDivisor);
separated[0].longValue(),
separated[1].movePointRight(decimalShift).longValue()
);
}
private static class DecimalNumber {