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95 changes: 95 additions & 0 deletions
95
...c/main/java/com/wultra/app/enrollmentserver/impl/service/converter/MonetaryConverter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * PowerAuth Enrollment Server | ||
| * Copyright (C) 2023 Wultra s.r.o. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published | ||
| * by the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package com.wultra.app.enrollmentserver.impl.service.converter; | ||
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| import lombok.extern.slf4j.Slf4j; | ||
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| import javax.money.CurrencyUnit; | ||
| import javax.money.Monetary; | ||
| import javax.money.UnknownCurrencyException; | ||
| import java.math.RoundingMode; | ||
| import java.text.NumberFormat; | ||
| import java.util.Currency; | ||
| import java.util.Locale; | ||
|
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| /** | ||
| * Convert currency and amount. | ||
| * | ||
| * @author Lubos Racansky, [email protected] | ||
| */ | ||
| @Slf4j | ||
| class MonetaryConverter { | ||
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| private static final int DEFAULT_MINIMAL_FRACTION_DIGITS = 2; | ||
| private static final int MAXIMAL_FRACTION_DIGITS = 18; | ||
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| private MonetaryConverter() { | ||
| // hidden constructor | ||
| } | ||
|
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| /** | ||
| * Convert the given currency code and locale. | ||
| * If there is no specific representation for the given currency and locale, original {@code code} is returned. | ||
| * | ||
| * @param code code to format | ||
| * @param locale locale to be used for the conversion | ||
| * @return localized currency or original code if there is no mapping available | ||
| */ | ||
| static String formatCurrency(final String code, final Locale locale) { | ||
| try { | ||
| // TODO (racansky, 2023-02-16) we should rely on javax.money.CurrencyUnit instead of java.util.Currency, but there is no support for display name yet | ||
| // https://github.com/JavaMoney/jsr354-api/issues/58 | ||
| return Currency.getInstance(code).getSymbol(locale); | ||
| } catch (final IllegalArgumentException e) { | ||
| logger.debug("No currency mapping for code={}, locale={}", code, locale); | ||
| logger.trace("No currency mapping for code={}, locale={}", code, locale, e); | ||
| return code; | ||
| } | ||
| } | ||
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| /** | ||
| * Convert the given amount according to the given code and locale. | ||
| * Amount is rounded down if limit of maximum fraction digits reached. | ||
| * | ||
| * @param amount amount to format | ||
| * @param code currency code | ||
| * @param locale locale to be used for the conversion | ||
| * @return formatted amount | ||
| */ | ||
| static String formatAmount(final Number amount, final String code, final Locale locale) { | ||
| final int fractionDigits = getFractionDigits(code); | ||
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| final NumberFormat format = NumberFormat.getInstance(locale); | ||
| format.setMinimumFractionDigits(fractionDigits); | ||
| format.setMaximumFractionDigits(MAXIMAL_FRACTION_DIGITS); | ||
| format.setRoundingMode(RoundingMode.DOWN); | ||
| return format.format(amount); | ||
| } | ||
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| private static int getFractionDigits(String code) { | ||
| try { | ||
| final CurrencyUnit currencyUnit = Monetary.getCurrency(code); | ||
| return currencyUnit.getDefaultFractionDigits(); | ||
| } catch (UnknownCurrencyException e) { | ||
| logger.debug("No currency mapping for code={}, most probably not FIAT", code); | ||
| logger.trace("No currency mapping for code={}", code, e); | ||
| return DEFAULT_MINIMAL_FRACTION_DIGITS; | ||
| } | ||
| } | ||
| } |
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77 changes: 77 additions & 0 deletions
77
...st/java/com/wultra/app/enrollmentserver/impl/service/converter/MonetaryConverterTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| * PowerAuth Enrollment Server | ||
| * Copyright (C) 2023 Wultra s.r.o. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published | ||
| * by the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package com.wultra.app.enrollmentserver.impl.service.converter; | ||
|
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| import org.junit.jupiter.params.ParameterizedTest; | ||
| import org.junit.jupiter.params.provider.CsvSource; | ||
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| import java.math.BigDecimal; | ||
| import java.util.Locale; | ||
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| import static org.junit.jupiter.api.Assertions.assertEquals; | ||
|
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| /** | ||
| * Test for {@link MonetaryConverter}. | ||
| * | ||
| * @author Lubos Racansky, [email protected] | ||
| */ | ||
| class MonetaryConverterTest { | ||
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| @ParameterizedTest | ||
| @CsvSource({ | ||
| "CZK, en, CZK", | ||
| "CZK, cs, Kč", | ||
| "USD, en, $", | ||
| "USD, cs, US$", | ||
| "UYU, cs, UYU", | ||
| "UYU, en, UYU", | ||
| "UYU, uy, UYU", | ||
| "CAD, cs, CA$", | ||
| "CAD, ca, CAD", | ||
| "CAD, en, CA$", | ||
| "NZD, en, NZ$", | ||
| "NZD, cs, NZ$", | ||
| "NZD, nz, NZ$", | ||
| "BTC, cs, BTC" | ||
| }) | ||
| void testFormatCurrency(final String source, final String locale, final String expected) { | ||
| final String result = MonetaryConverter.formatCurrency(source, new Locale(locale)); | ||
| assertEquals(expected, result); | ||
| } | ||
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| @ParameterizedTest | ||
| @CsvSource({ | ||
| "1710.9817, CZK, en, '1,710.9817'", | ||
| "1710.9817, CZK, cs, '1 710,9817'", | ||
| "1710, CZK, cs, '1 710,00'", | ||
| "1710, USD, en, '1,710.00'", | ||
| "1710.1, CZK, cs, '1 710,10'", | ||
| "1710.1, USD, en, '1,710.10'", | ||
| "1710, JPY, jp, '1,710'", | ||
| "1710, JPY, en, '1,710'", | ||
| "1710, JPY, cs, '1 710'", | ||
| "1, BTC, en, '1.00'", | ||
| "1.1, BTC, en, '1.10'", | ||
| "0.123456789, BTC, en, '0.123456789'", | ||
| "0.567567567567567567567, BTC, en, '0.567567567567567567'" | ||
| }) | ||
| void testFormatAmount(final String amount, final String code, final String locale, final String expected) { | ||
| final String result = MonetaryConverter.formatAmount(new BigDecimal(amount), code, new Locale(locale)); | ||
| assertEquals(expected, result); | ||
| } | ||
| } |
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