From 612876e44de35cdbd563ac2ce40dcd1d4e397bc5 Mon Sep 17 00:00:00 2001 From: Torsten Grote Date: Tue, 18 Aug 2020 11:35:28 -0300 Subject: Include Taler common Kotlin library as a submodule --- .../commonMain/kotlin/net/taler/common/Amount.kt | 198 --------------------- 1 file changed, 198 deletions(-) delete mode 100644 taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Amount.kt (limited to 'taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Amount.kt') diff --git a/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Amount.kt b/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Amount.kt deleted file mode 100644 index 84d10c5..0000000 --- a/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Amount.kt +++ /dev/null @@ -1,198 +0,0 @@ -/* - * This file is part of GNU Taler - * (C) 2020 Taler Systems S.A. - * - * GNU Taler 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, or (at your option) any later version. - * - * GNU Taler 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 - * GNU Taler; see the file COPYING. If not, see - */ - -package net.taler.common - -import kotlinx.serialization.Decoder -import kotlinx.serialization.Encoder -import kotlinx.serialization.KSerializer -import kotlinx.serialization.Serializable -import kotlinx.serialization.Serializer -import kotlin.math.floor -import kotlin.math.pow -import kotlin.math.roundToInt - -class AmountParserException(msg: String? = null, cause: Throwable? = null) : Exception(msg, cause) -class AmountOverflowException(msg: String? = null, cause: Throwable? = null) : Exception(msg, cause) - -@Serializable(with = KotlinXAmountSerializer::class) -data class Amount( - /** - * name of the currency using either a three-character ISO 4217 currency code, - * or a regional currency identifier starting with a "*" followed by at most 10 characters. - * ISO 4217 exponents in the name are not supported, - * although the "fraction" is corresponds to an ISO 4217 exponent of 6. - */ - val currency: String, - - /** - * The integer part may be at most 2^52. - * Note that "1" here would correspond to 1 EUR or 1 USD, depending on currency, not 1 cent. - */ - val value: Long, - - /** - * Unsigned 32 bit fractional value to be added to value representing - * an additional currency fraction, in units of one hundred millionth (1e-8) - * of the base currency value. For example, a fraction - * of 50_000_000 would correspond to 50 cents. - */ - val fraction: Int -) : Comparable { - - companion object { - - private const val FRACTIONAL_BASE: Int = 100000000 // 1e8 - - private val REGEX_CURRENCY = Regex("""^[-_*A-Za-z0-9]{1,12}$""") - val MAX_VALUE = 2.0.pow(52).toLong() - private const val MAX_FRACTION_LENGTH = 8 - const val MAX_FRACTION = 99_999_999 - - fun zero(currency: String): Amount { - return Amount(checkCurrency(currency), 0, 0) - } - - fun fromJSONString(str: String): Amount { - val split = str.split(":") - if (split.size != 2) throw AmountParserException("Invalid Amount Format") - return fromString(split[0], split[1]) - } - - fun fromString(currency: String, str: String): Amount { - // value - val valueSplit = str.split(".") - val value = checkValue(valueSplit[0].toLongOrNull()) - // fraction - val fraction: Int = if (valueSplit.size > 1) { - val fractionStr = valueSplit[1] - if (fractionStr.length > MAX_FRACTION_LENGTH) - throw AmountParserException("Fraction $fractionStr too long") - val fraction = "0.$fractionStr".toDoubleOrNull() - ?.times(FRACTIONAL_BASE) - ?.roundToInt() - checkFraction(fraction) - } else 0 - return Amount(checkCurrency(currency), value, fraction) - } - - fun min(currency: String): Amount = Amount(currency, 0, 1) - fun max(currency: String): Amount = Amount(currency, MAX_VALUE, MAX_FRACTION) - - - internal fun checkCurrency(currency: String): String { - if (!REGEX_CURRENCY.matches(currency)) - throw AmountParserException("Invalid currency: $currency") - return currency - } - - internal fun checkValue(value: Long?): Long { - if (value == null || value > MAX_VALUE) - throw AmountParserException("Value $value greater than $MAX_VALUE") - return value - } - - internal fun checkFraction(fraction: Int?): Int { - if (fraction == null || fraction > MAX_FRACTION) - throw AmountParserException("Fraction $fraction greater than $MAX_FRACTION") - return fraction - } - - } - - val amountStr: String - get() = if (fraction == 0) "$value" else { - var f = fraction - var fractionStr = "" - while (f > 0) { - fractionStr += f / (FRACTIONAL_BASE / 10) - f = (f * 10) % FRACTIONAL_BASE - } - "$value.$fractionStr" - } - - operator fun plus(other: Amount): Amount { - check(currency == other.currency) { "Can only subtract from same currency" } - val resultValue = value + other.value + floor((fraction + other.fraction).toDouble() / FRACTIONAL_BASE).toLong() - if (resultValue > MAX_VALUE) - throw AmountOverflowException() - val resultFraction = (fraction + other.fraction) % FRACTIONAL_BASE - return Amount(currency, resultValue, resultFraction) - } - - operator fun times(factor: Int): Amount { - // TODO consider replacing with a faster implementation - if (factor == 0) return zero(currency) - var result = this - for (i in 1 until factor) result += this - return result - } - - operator fun minus(other: Amount): Amount { - check(currency == other.currency) { "Can only subtract from same currency" } - var resultValue = value - var resultFraction = fraction - if (resultFraction < other.fraction) { - if (resultValue < 1L) - throw AmountOverflowException() - resultValue-- - resultFraction += FRACTIONAL_BASE - } - check(resultFraction >= other.fraction) - resultFraction -= other.fraction - if (resultValue < other.value) - throw AmountOverflowException() - resultValue -= other.value - return Amount(currency, resultValue, resultFraction) - } - - fun isZero(): Boolean { - return value == 0L && fraction == 0 - } - - fun toJSONString(): String { - return "$currency:$amountStr" - } - - override fun toString(): String { - return "$amountStr $currency" - } - - override fun compareTo(other: Amount): Int { - check(currency == other.currency) { "Can only compare amounts with the same currency" } - when { - value == other.value -> { - if (fraction < other.fraction) return -1 - if (fraction > other.fraction) return 1 - return 0 - } - value < other.value -> return -1 - else -> return 1 - } - } - -} - -@Serializer(forClass = Amount::class) -object KotlinXAmountSerializer: KSerializer { - override fun serialize(encoder: Encoder, value: Amount) { - encoder.encodeString(value.toJSONString()) - } - - override fun deserialize(decoder: Decoder): Amount { - return Amount.fromJSONString(decoder.decodeString()) - } -} -- cgit v1.2.3