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/*
* This file is part of LibEuFin.
* Copyright (C) 2020 Taler Systems S.A.
*
* LibEuFin 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, or
* (at your option) any later version.
*
* LibEuFin 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 LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.util
import org.jetbrains.exposed.sql.Column
import org.jetbrains.exposed.sql.ColumnType
import org.jetbrains.exposed.sql.Table
import java.math.BigDecimal
import java.math.RoundingMode
const val SCALE_TWO = 2
const val NUMBER_MAX_DIGITS = 20
class BadAmount(badValue: Any?) : Exception("Value '${badValue}' is not a valid amount")
typealias Amount = BigDecimal
class AmountColumnType : ColumnType() {
override fun sqlType(): String = "DECIMAL(${NUMBER_MAX_DIGITS}, ${SCALE_TWO})"
override fun valueFromDB(value: Any): Any {
val valueFromDB = super.valueFromDB(value)
try {
return when (valueFromDB) {
is BigDecimal -> valueFromDB.setScale(SCALE_TWO, RoundingMode.UNNECESSARY)
is Double -> BigDecimal.valueOf(valueFromDB).setScale(SCALE_TWO, RoundingMode.UNNECESSARY)
is Float -> BigDecimal(valueFromDB.toString()).setScale(
SCALE_TWO,
RoundingMode.UNNECESSARY
)
is Int -> BigDecimal(valueFromDB)
is Long -> BigDecimal.valueOf(valueFromDB)
else -> valueFromDB
}
} catch (e: Exception) {
e.printStackTrace()
throw BadAmount(value)
}
}
override fun valueToDB(value: Any?): Any? {
try {
(value as BigDecimal).setScale(SCALE_TWO, RoundingMode.UNNECESSARY)
} catch (e: Exception) {
e.printStackTrace()
throw BadAmount(value)
}
if (value.compareTo(BigDecimal.ZERO) == 0) {
throw BadAmount(value)
}
return super.valueToDB(value)
}
}
/**
* Make sure the number entered by upper layers does not need any rounding
* to conform to scale == 2
*/
fun Table.amount(name: String): Column<Amount> {
return registerColumn(name, AmountColumnType())
}
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