UnitsConverter.java
// © 2020 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
package com.ibm.icu.impl.units;
import static java.math.MathContext.DECIMAL128;
import com.ibm.icu.impl.IllegalIcuArgumentException;
import com.ibm.icu.util.MeasureUnit;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.regex.Pattern;
// TODO ICU-22683: Consider splitting handling of special mappings into separate (possibly internal)
// class
public class UnitsConverter {
private BigDecimal conversionRate;
private boolean reciprocal;
private BigDecimal offset;
private String specialSource;
private String specialTarget;
/**
* Constructor of <code>UnitsConverter</code>. NOTE: - source and target must be under the same
* category - e.g. meter to mile --> both of them are length units.
*
* <p>NOTE: This constructor creates an instance of <code>UnitsConverter</code> internally.
*
* @param sourceIdentifier represents the source unit identifier.
* @param targetIdentifier represents the target unit identifier.
*/
public UnitsConverter(String sourceIdentifier, String targetIdentifier) {
this(
MeasureUnitImpl.forIdentifier(sourceIdentifier),
MeasureUnitImpl.forIdentifier(targetIdentifier),
new ConversionRates());
}
/**
* Constructor of <code>UnitsConverter</code>. NOTE: - source and target must be under the same
* category - e.g. meter to mile --> both of them are length units. This converts from source to
* base to target (one of those may be a no-op).
*
* @param source represents the source unit.
* @param target represents the target unit.
* @param conversionRates contains all the needed conversion rates.
*/
public UnitsConverter(
MeasureUnitImpl source, MeasureUnitImpl target, ConversionRates conversionRates) {
Convertibility convertibility = extractConvertibility(source, target, conversionRates);
if (convertibility != Convertibility.CONVERTIBLE
&& convertibility != Convertibility.RECIPROCAL) {
throw new IllegalIcuArgumentException("input units must be convertible or reciprocal");
}
this.specialSource = conversionRates.getSpecialMappingName(source);
this.specialTarget = conversionRates.getSpecialMappingName(target);
if (this.specialSource == null && this.specialTarget == null) {
Factor sourceToBase = conversionRates.getFactorToBase(source);
Factor targetToBase = conversionRates.getFactorToBase(target);
if (convertibility == Convertibility.CONVERTIBLE) {
this.conversionRate = sourceToBase.divide(targetToBase).getConversionRate();
} else {
assert convertibility == Convertibility.RECIPROCAL;
this.conversionRate = sourceToBase.multiply(targetToBase).getConversionRate();
}
this.reciprocal = convertibility == Convertibility.RECIPROCAL;
// calculate the offset
this.offset =
conversionRates.getOffset(
source, target, sourceToBase, targetToBase, convertibility);
// We should see no offsets for reciprocal conversions - they don't make sense:
assert convertibility != Convertibility.RECIPROCAL || this.offset == BigDecimal.ZERO;
} else {
this.reciprocal = false;
this.offset = BigDecimal.ZERO;
if (this.specialSource == null) {
// conversionRate is for source to base only
this.conversionRate = conversionRates.getFactorToBase(source).getConversionRate();
} else if (this.specialTarget == null) {
// conversionRate is for base to target only
this.conversionRate = conversionRates.getFactorToBase(target).getConversionRate();
} else {
this.conversionRate = BigDecimal.ONE;
}
}
}
public static Convertibility extractConvertibility(
MeasureUnitImpl source, MeasureUnitImpl target, ConversionRates conversionRates) {
ArrayList<SingleUnitImpl> sourceSingleUnits = conversionRates.extractBaseUnits(source);
ArrayList<SingleUnitImpl> targetSingleUnits = conversionRates.extractBaseUnits(target);
HashMap<String, Integer> dimensionMap = new HashMap<>();
insertInMap(dimensionMap, sourceSingleUnits, 1);
insertInMap(dimensionMap, targetSingleUnits, -1);
if (areDimensionsZeroes(dimensionMap)) return Convertibility.CONVERTIBLE;
insertInMap(dimensionMap, targetSingleUnits, 2);
if (areDimensionsZeroes(dimensionMap)) return Convertibility.RECIPROCAL;
return Convertibility.UNCONVERTIBLE;
}
/** Helpers */
private static void insertInMap(
HashMap<String, Integer> dimensionMap,
ArrayList<SingleUnitImpl> singleUnits,
int multiplier) {
for (SingleUnitImpl singleUnit : singleUnits) {
if (dimensionMap.containsKey(singleUnit.getSimpleUnitID())) {
dimensionMap.put(
singleUnit.getSimpleUnitID(),
dimensionMap.get(singleUnit.getSimpleUnitID())
+ singleUnit.getDimensionality() * multiplier);
} else {
dimensionMap.put(
singleUnit.getSimpleUnitID(), singleUnit.getDimensionality() * multiplier);
}
}
}
private static boolean areDimensionsZeroes(HashMap<String, Integer> dimensionMap) {
for (Integer value : dimensionMap.values()) {
if (!value.equals(0)) return false;
}
return true;
}
// Convert inputValue (source) to base then to target
public BigDecimal convert(BigDecimal inputValue) {
BigDecimal result = inputValue;
if (this.specialSource != null || this.specialTarget != null) {
BigDecimal base = inputValue;
// convert input (=source) to base
if (this.specialSource != null) {
// We have a special mapping from source to base (not using factor, offset).
// Currently the only supported mapping is a scale-based mapping for beaufort.
base =
(this.specialSource.equals("beaufort"))
? scaleToBase(inputValue, minMetersPerSecForBeaufort)
: inputValue;
} else {
// Standard mapping (using factor, offset) from source to base.
base = inputValue.multiply(this.conversionRate);
}
// convert base to result (=target)
if (this.specialTarget != null) {
// We have a special mapping from base to target (not using factor, offset).
// Currently the only supported mapping is a scale-based mapping for beaufort.
result =
(this.specialTarget.equals("beaufort"))
? baseToScale(base, minMetersPerSecForBeaufort)
: base;
} else {
// Standard mapping (using factor, offset) from base to target.
result = base.divide(this.conversionRate, DECIMAL128);
}
return result;
}
result = inputValue.multiply(this.conversionRate).add(offset);
if (this.reciprocal) {
// We should see no offsets for reciprocal conversions - they don't make sense:
assert offset == BigDecimal.ZERO;
if (result.compareTo(BigDecimal.ZERO) == 0) {
// TODO(ICU-21988): determine desirable behaviour
return BigDecimal.ZERO;
}
result = BigDecimal.ONE.divide(result, DECIMAL128);
}
return result;
}
// Convert inputValue (target) to base then to source
public BigDecimal convertInverse(BigDecimal inputValue) {
BigDecimal result = inputValue;
if (this.specialSource != null || this.specialTarget != null) {
BigDecimal base = inputValue;
// convert input (=target) to base
if (this.specialTarget != null) {
// We have a special mapping from target to base (not using factor, offset).
// Currently the only supported mapping is a scale-based mapping for beaufort.
base =
(this.specialTarget.equals("beaufort"))
? scaleToBase(inputValue, minMetersPerSecForBeaufort)
: inputValue;
} else {
// Standard mapping (using factor, offset) from target to base.
base = inputValue.multiply(this.conversionRate);
}
// convert base to result (=source)
if (this.specialSource != null) {
// We have a special mapping from base to source (not using factor, offset).
// Currently the only supported mapping is a scale-based mapping for beaufort.
result =
(this.specialSource.equals("beaufort"))
? baseToScale(base, minMetersPerSecForBeaufort)
: base;
} else {
// Standard mapping (using factor, offset) from base to source.
result = base.divide(this.conversionRate, DECIMAL128);
}
return result;
}
if (this.reciprocal) {
// We should see no offsets for reciprocal conversions - they don't make sense:
assert offset == BigDecimal.ZERO;
if (result.compareTo(BigDecimal.ZERO) == 0) {
// TODO(ICU-21988): determine desirable behaviour
return BigDecimal.ZERO;
}
result = BigDecimal.ONE.divide(result, DECIMAL128);
}
result = result.subtract(offset).divide(this.conversionRate, DECIMAL128);
return result;
}
// TODO per CLDR-17421 and ICU-22683: consider getting the data below from CLDR
private static final BigDecimal[] minMetersPerSecForBeaufort = {
// Minimum m/s (base) values for each Bft value, plus an extra artificial value;
// when converting from Bft to m/s, the middle of the range will be used
// (Values from table in Wikipedia, except for artificial value).
// Since this is 0 based, max Beaufort value is thus array dimension minus 2.
BigDecimal.valueOf(0.0), // 0 Bft
BigDecimal.valueOf(0.3), // 1
BigDecimal.valueOf(1.6), // 2
BigDecimal.valueOf(3.4), // 3
BigDecimal.valueOf(5.5), // 4
BigDecimal.valueOf(8.0), // 5
BigDecimal.valueOf(10.8), // 6
BigDecimal.valueOf(13.9), // 7
BigDecimal.valueOf(17.2), // 8
BigDecimal.valueOf(20.8), // 9
BigDecimal.valueOf(24.5), // 10
BigDecimal.valueOf(28.5), // 11
BigDecimal.valueOf(32.7), // 12
BigDecimal.valueOf(36.9), // 13
BigDecimal.valueOf(41.4), // 14
BigDecimal.valueOf(46.1), // 15
BigDecimal.valueOf(51.1), // 16
BigDecimal.valueOf(55.8), // 17
BigDecimal.valueOf(61.4), // artificial end of range 17 to give reasonable midpoint
};
// Convert from what should be discrete scale values for a particular unit like beaufort
// to a corresponding value in the base unit (which can have any decimal value, like
// meters/sec).
// First we round the scale value to the nearest integer (in case it is specified with a
// fractional value),
// then we map that to a value in middle of the range of corresponding base values.
// This can handle different scales, specified by minBaseForScaleValues[].
private BigDecimal scaleToBase(BigDecimal scaleValue, BigDecimal[] minBaseForScaleValues) {
BigDecimal pointFive = BigDecimal.valueOf(0.5);
BigDecimal scaleAdjust = scaleValue.abs().add(pointFive); // adjust up for later truncation
BigDecimal scaleAdjustCapped =
scaleAdjust.min(BigDecimal.valueOf(minBaseForScaleValues.length - 2));
int scaleIndex = scaleAdjustCapped.intValue();
// Return midpont of range (the final range uses an articial end to produce reasonable
// midpoint)
return minBaseForScaleValues[scaleIndex]
.add(minBaseForScaleValues[scaleIndex + 1])
.multiply(pointFive);
}
// Convert from a value in the base unit (which can have any decimal value, like meters/sec) to
// a corresponding
// discrete value in a scale (like beaufort), where each scale value represents a range of base
// values.
// We binary-search the ranges to find the one that contains the specified base value, and
// return its index.
// This can handle different scales, specified by minBaseForScaleValues[].
private BigDecimal baseToScale(BigDecimal baseValue, BigDecimal[] minBaseForScaleValues) {
int scaleIndex = Arrays.binarySearch(minBaseForScaleValues, baseValue.abs());
if (scaleIndex < 0) {
// since our first array entry is 0, this value will always be -2 or less
scaleIndex = -scaleIndex - 2;
}
int scaleMax = minBaseForScaleValues.length - 2;
if (scaleIndex > scaleMax) {
scaleIndex = scaleMax;
}
return BigDecimal.valueOf(scaleIndex);
}
public enum Convertibility {
CONVERTIBLE,
RECIPROCAL,
UNCONVERTIBLE,
}
public ConversionInfo getConversionInfo() {
ConversionInfo result = new ConversionInfo();
result.conversionRate = this.conversionRate;
result.offset = this.offset;
result.reciprocal = this.reciprocal;
return result;
}
public static class ConversionInfo {
public BigDecimal conversionRate;
public BigDecimal offset;
public boolean reciprocal;
}
/** Responsible for all the Factor operation NOTE: This class is immutable */
static class Factor {
private BigDecimal factorNum;
private BigDecimal factorDen;
// The exponents below correspond to ICU4C's Factor::exponents[].
/** Exponent for the ft_to_m constant */
private int exponentFtToM = 0;
/** Exponent for PI */
private int exponentPi = 0;
/** Exponent for gravity (gravity-of-earth, "g") */
private int exponentGravity = 0;
/** Exponent for Newtonian constant of gravitation "G". */
private int exponentG = 0;
/** Exponent for the imperial-gallon to cubic-meter conversion rate constant */
private int exponentGalImpToM3 = 0;
/** Exponent for the pound to kilogram conversion rate constant */
private int exponentLbToKg = 0;
/** Exponent for the glucose molar mass conversion rate constant */
private int exponentGlucoseMolarMass = 0;
/** Exponent for the item per mole conversion rate constant */
private int exponentItemPerMole = 0;
/** Exponent for the meters per AU conversion rate constant */
private int exponentMetersPerAU = 0;
/** Exponent for the sec per julian year conversion rate constant */
private int exponentSecPerJulianYear = 0;
/** Exponent for the speed of light meters per second" conversion rate constant */
private int exponentSpeedOfLightMetersPerSecond = 0;
/** Exponent for https://en.wikipedia.org/wiki/Japanese_units_of_measurement */
private int exponentShoToM3 = 0;
/** Exponent for https://en.wikipedia.org/wiki/Japanese_units_of_measurement */
private int exponentTsuboToM2 = 0;
/** Exponent for https://en.wikipedia.org/wiki/Japanese_units_of_measurement */
private int exponentShakuToM = 0;
/** Exponent for Atomic Mass Unit */
private int exponentAMU = 0;
/** Creates Empty Factor */
public Factor() {
this.factorNum = BigDecimal.valueOf(1);
this.factorDen = BigDecimal.valueOf(1);
}
public static Factor processFactor(String factor) {
assert (!factor.isEmpty());
// Remove all spaces in the factor
factor = factor.replaceAll("\\s+", "");
String[] fractions = factor.split("/");
assert (fractions.length == 1 || fractions.length == 2);
if (fractions.length == 1) {
return processFactorWithoutDivision(fractions[0]);
}
Factor num = processFactorWithoutDivision(fractions[0]);
Factor den = processFactorWithoutDivision(fractions[1]);
return num.divide(den);
}
private static Factor processFactorWithoutDivision(String factorWithoutDivision) {
Factor result = new Factor();
for (String poweredEntity : factorWithoutDivision.split(Pattern.quote("*"))) {
result.addPoweredEntity(poweredEntity);
}
return result;
}
/** Copy this <code>Factor</code>. */
protected Factor copy() {
Factor result = new Factor();
result.factorNum = this.factorNum;
result.factorDen = this.factorDen;
result.exponentFtToM = this.exponentFtToM;
result.exponentPi = this.exponentPi;
result.exponentGravity = this.exponentGravity;
result.exponentG = this.exponentG;
result.exponentGalImpToM3 = this.exponentGalImpToM3;
result.exponentLbToKg = this.exponentLbToKg;
result.exponentGlucoseMolarMass = this.exponentGlucoseMolarMass;
result.exponentItemPerMole = this.exponentItemPerMole;
result.exponentMetersPerAU = this.exponentMetersPerAU;
result.exponentSecPerJulianYear = this.exponentSecPerJulianYear;
result.exponentSpeedOfLightMetersPerSecond = this.exponentSpeedOfLightMetersPerSecond;
result.exponentShoToM3 = this.exponentShoToM3;
result.exponentTsuboToM2 = this.exponentTsuboToM2;
result.exponentShakuToM = this.exponentShakuToM;
result.exponentAMU = this.exponentAMU;
return result;
}
/**
* Returns a single {@code BigDecimal} that represent the conversion rate after substituting
* all the constants.
*
* <p>In ICU4C, see Factor::substituteConstants().
*/
public BigDecimal getConversionRate() {
// TODO: this copies all the exponents then doesn't use them at all.
Factor resultCollector = this.copy();
// TODO(icu-units#92): port C++ unit tests to Java.
// These values are a hard-coded subset of unitConstants in the
// units resources file. A unit test should check that all constants
// in the resource file are at least recognised by the code.
// In ICU4C, these constants live in constantsValues[].
resultCollector.multiply(new BigDecimal("0.3048"), this.exponentFtToM);
// TODO: this recalculates this division every time this is called.
resultCollector.multiply(
new BigDecimal("411557987.0").divide(new BigDecimal("131002976.0"), DECIMAL128),
this.exponentPi);
resultCollector.multiply(new BigDecimal("9.80665"), this.exponentGravity);
resultCollector.multiply(new BigDecimal("6.67408E-11"), this.exponentG);
resultCollector.multiply(new BigDecimal("0.00454609"), this.exponentGalImpToM3);
resultCollector.multiply(new BigDecimal("0.45359237"), this.exponentLbToKg);
resultCollector.multiply(new BigDecimal("180.1557"), this.exponentGlucoseMolarMass);
resultCollector.multiply(new BigDecimal("6.02214076E+23"), this.exponentItemPerMole);
resultCollector.multiply(new BigDecimal("149597870700"), this.exponentMetersPerAU);
resultCollector.multiply(new BigDecimal("31557600"), this.exponentSecPerJulianYear);
resultCollector.multiply(
new BigDecimal("299792458"), this.exponentSpeedOfLightMetersPerSecond);
resultCollector.multiply(
new BigDecimal("0.001803906836964688204"),
this.exponentShoToM3); // 2401/(1331*1000)
resultCollector.multiply(
new BigDecimal("3.305785123966942"), this.exponentTsuboToM2); // 400/121
resultCollector.multiply(
new BigDecimal("0.033057851239669"), this.exponentShakuToM); // 4/121
resultCollector.multiply(new BigDecimal("1.66053878283E-27"), this.exponentAMU);
return resultCollector.factorNum.divide(resultCollector.factorDen, DECIMAL128);
}
/** Multiplies the Factor instance by value^power. */
private void multiply(BigDecimal value, int power) {
if (power == 0) return;
BigDecimal absPoweredValue = value.pow(Math.abs(power), DECIMAL128);
if (power > 0) {
this.factorNum = this.factorNum.multiply(absPoweredValue);
} else {
this.factorDen = this.factorDen.multiply(absPoweredValue);
}
}
/** Apply SI or binary prefix to the Factor. */
public Factor applyPrefix(MeasureUnit.MeasurePrefix unitPrefix) {
Factor result = this.copy();
if (unitPrefix == MeasureUnit.MeasurePrefix.ONE) {
return result;
}
int base = unitPrefix.getBase();
int power = unitPrefix.getPower();
BigDecimal absFactor = BigDecimal.valueOf(base).pow(Math.abs(power), DECIMAL128);
if (power < 0) {
result.factorDen = this.factorDen.multiply(absFactor);
return result;
}
result.factorNum = this.factorNum.multiply(absFactor);
return result;
}
public Factor power(int power) {
Factor result = new Factor();
if (power == 0) return result;
if (power > 0) {
result.factorNum = this.factorNum.pow(power);
result.factorDen = this.factorDen.pow(power);
} else {
result.factorNum = this.factorDen.pow(power * -1);
result.factorDen = this.factorNum.pow(power * -1);
}
result.exponentFtToM = this.exponentFtToM * power;
result.exponentPi = this.exponentPi * power;
result.exponentGravity = this.exponentGravity * power;
result.exponentG = this.exponentG * power;
result.exponentGalImpToM3 = this.exponentGalImpToM3 * power;
result.exponentLbToKg = this.exponentLbToKg * power;
result.exponentGlucoseMolarMass = this.exponentGlucoseMolarMass * power;
result.exponentItemPerMole = this.exponentItemPerMole * power;
result.exponentMetersPerAU = this.exponentMetersPerAU * power;
result.exponentSecPerJulianYear = this.exponentSecPerJulianYear * power;
result.exponentSpeedOfLightMetersPerSecond =
this.exponentSpeedOfLightMetersPerSecond * power;
result.exponentShoToM3 = this.exponentShoToM3 * power;
result.exponentTsuboToM2 = this.exponentTsuboToM2 * power;
result.exponentShakuToM = this.exponentShakuToM * power;
result.exponentAMU = this.exponentAMU * power;
return result;
}
public Factor divide(Factor other) {
Factor result = new Factor();
result.factorNum = this.factorNum.multiply(other.factorDen);
result.factorDen = this.factorDen.multiply(other.factorNum);
result.exponentFtToM = this.exponentFtToM - other.exponentFtToM;
result.exponentPi = this.exponentPi - other.exponentPi;
result.exponentGravity = this.exponentGravity - other.exponentGravity;
result.exponentG = this.exponentG - other.exponentG;
result.exponentGalImpToM3 = this.exponentGalImpToM3 - other.exponentGalImpToM3;
result.exponentLbToKg = this.exponentLbToKg - other.exponentLbToKg;
result.exponentGlucoseMolarMass =
this.exponentGlucoseMolarMass - other.exponentGlucoseMolarMass;
result.exponentItemPerMole = this.exponentItemPerMole - other.exponentItemPerMole;
result.exponentMetersPerAU = this.exponentMetersPerAU - other.exponentMetersPerAU;
result.exponentSecPerJulianYear =
this.exponentSecPerJulianYear - other.exponentSecPerJulianYear;
result.exponentSpeedOfLightMetersPerSecond =
this.exponentSpeedOfLightMetersPerSecond
- other.exponentSpeedOfLightMetersPerSecond;
result.exponentShoToM3 = this.exponentShoToM3 - other.exponentShoToM3;
result.exponentTsuboToM2 = this.exponentTsuboToM2 - other.exponentTsuboToM2;
result.exponentShakuToM = this.exponentShakuToM - other.exponentShakuToM;
result.exponentAMU = this.exponentAMU - other.exponentAMU;
return result;
}
public Factor multiply(Factor other) {
Factor result = new Factor();
result.factorNum = this.factorNum.multiply(other.factorNum);
result.factorDen = this.factorDen.multiply(other.factorDen);
result.exponentFtToM = this.exponentFtToM + other.exponentFtToM;
result.exponentPi = this.exponentPi + other.exponentPi;
result.exponentGravity = this.exponentGravity + other.exponentGravity;
result.exponentG = this.exponentG + other.exponentG;
result.exponentGalImpToM3 = this.exponentGalImpToM3 + other.exponentGalImpToM3;
result.exponentLbToKg = this.exponentLbToKg + other.exponentLbToKg;
result.exponentGlucoseMolarMass =
this.exponentGlucoseMolarMass + other.exponentGlucoseMolarMass;
result.exponentItemPerMole = this.exponentItemPerMole + other.exponentItemPerMole;
result.exponentMetersPerAU = this.exponentMetersPerAU + other.exponentMetersPerAU;
result.exponentSecPerJulianYear =
this.exponentSecPerJulianYear + other.exponentSecPerJulianYear;
result.exponentSpeedOfLightMetersPerSecond =
this.exponentSpeedOfLightMetersPerSecond
+ other.exponentSpeedOfLightMetersPerSecond;
result.exponentShoToM3 = this.exponentShoToM3 + other.exponentShoToM3;
result.exponentTsuboToM2 = this.exponentTsuboToM2 + other.exponentTsuboToM2;
result.exponentShakuToM = this.exponentShakuToM + other.exponentShakuToM;
result.exponentAMU = this.exponentAMU + other.exponentAMU;
return result;
}
public Factor divide(BigDecimal value) {
Factor result = this.copy();
result.factorDen = this.factorDen.multiply(value);
return result;
}
/**
* Adds Entity with power or not. For example, {@code 12 ^ 3} or {@code 12}.
*
* @param poweredEntity
*/
private void addPoweredEntity(String poweredEntity) {
String[] entities = poweredEntity.split(Pattern.quote("^"));
assert (entities.length == 1 || entities.length == 2);
int power = entities.length == 2 ? Integer.parseInt(entities[1]) : 1;
this.addEntity(entities[0], power);
}
private void addEntity(String entity, int power) {
if ("ft_to_m".equals(entity)) {
this.exponentFtToM += power;
} else if ("ft2_to_m2".equals(entity)) {
this.exponentFtToM += 2 * power;
} else if ("ft3_to_m3".equals(entity)) {
this.exponentFtToM += 3 * power;
} else if ("in3_to_m3".equals(entity)) {
this.exponentFtToM += 3 * power;
this.factorDen = this.factorDen.multiply(BigDecimal.valueOf(Math.pow(12, 3)));
} else if ("gal_to_m3".equals(entity)) {
this.factorNum = this.factorNum.multiply(BigDecimal.valueOf(231));
this.exponentFtToM += 3 * power;
this.factorDen = this.factorDen.multiply(BigDecimal.valueOf(12 * 12 * 12));
} else if ("gal_imp_to_m3".equals(entity)) {
this.exponentGalImpToM3 += power;
} else if ("G".equals(entity)) {
this.exponentG += power;
} else if ("gravity".equals(entity)) {
this.exponentGravity += power;
} else if ("lb_to_kg".equals(entity)) {
this.exponentLbToKg += power;
} else if ("glucose_molar_mass".equals(entity)) {
this.exponentGlucoseMolarMass += power;
} else if ("item_per_mole".equals(entity)) {
this.exponentItemPerMole += power;
} else if ("meters_per_AU".equals(entity)) {
this.exponentMetersPerAU += power;
} else if ("PI".equals(entity)) {
this.exponentPi += power;
} else if ("sec_per_julian_year".equals(entity)) {
this.exponentSecPerJulianYear += power;
} else if ("speed_of_light_meters_per_second".equals(entity)) {
this.exponentSpeedOfLightMetersPerSecond += power;
} else if ("sho_to_m3".equals(entity)) {
this.exponentShoToM3 += power;
} else if ("tsubo_to_m2".equals(entity)) {
this.exponentTsuboToM2 += power;
} else if ("shaku_to_m".equals(entity)) {
this.exponentShakuToM += power;
} else if ("AMU".equals(entity)) {
this.exponentAMU += power;
} else {
BigDecimal decimalEntity = new BigDecimal(entity).pow(power, DECIMAL128);
this.factorNum = this.factorNum.multiply(decimalEntity);
}
}
}
@Override
public String toString() {
return "UnitsConverter [conversionRate=" + conversionRate + ", offset=" + offset + "]";
}
}