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Fixed that SimpleDateFormat is not thread-safe and produced some curious results

This commit is contained in:
dankito 2020-04-23 15:03:56 +02:00
parent 643ae4ecd8
commit 5fa3bf18ff
1 changed files with 25 additions and 5 deletions
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30
fints4javaLib/src/main/kotlin/net/dankito/fints/transactions/mt940/Mt940Parser.kt
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@ -48,6 +48,8 @@ open class Mt940Parser : IMt940Parser {
val DateFormat = SimpleDateFormat("yyMMdd")
val CurrentYearTwoDigit = Date().year - 100
val CreditDebitCancellationPattern = Pattern.compile("C|D|RC|RD")
val AmountPattern = Pattern.compile("\\d+,\\d*")
@ -194,7 +196,7 @@ open class Mt940Parser : IMt940Parser {
val isDebit = fieldValue.startsWith("D")
val bookingDateString = fieldValue.substring(1, 7)
val statementDate = parseDate(bookingDateString)
val statementDate = parseMt940Date(bookingDateString)
val currency = fieldValue.substring(7, 10)
val amountString = fieldValue.substring(10)
val amount = parseAmount(amountString)
@ -221,7 +223,7 @@ open class Mt940Parser : IMt940Parser {
protected open fun parseTurnover(fieldValue: String): Turnover {
val valueDateString = fieldValue.substring(0, 6)
val valueDate = parseDate(valueDateString)
val valueDate = parseMt940Date(valueDateString)
val creditMarkMatcher = CreditDebitCancellationPattern.matcher(fieldValue)
creditMarkMatcher.find()
@ -230,7 +232,7 @@ open class Mt940Parser : IMt940Parser {
val bookingDateString = if (creditMarkMatcher.start() > 6) fieldValue.substring(6, 10) else null
val bookingDate = bookingDateString?.let { // bookingDateString has format MMdd -> add year from valueDateString
parseDate(valueDateString.substring(0, 2) + bookingDateString)
parseMt940Date(valueDateString.substring(0, 2) + bookingDateString)
}
val amountMatcher = AmountPattern.matcher(fieldValue)
@ -394,8 +396,26 @@ open class Mt940Parser : IMt940Parser {
}
protected open fun parseDate(dateString: String): Date {
return DateFormat.parse(dateString)
protected open fun parseMt940Date(dateString: String): Date {
// SimpleDateFormat is not thread-safe. Before adding another library i decided to parse
// this really simple date format on my own
if (dateString.length == 6) {
try {
var year = dateString.substring(0, 2).toInt()
val month = dateString.substring(2, 4).toInt()
val day = dateString.substring(4, 6).toInt()
if (year > CurrentYearTwoDigit + 1) { // should be rarely the case: years before 2000
year -= 100
}
return Date(year + 100, month - 1, day) // java.util.Date years start at 1900 at month at 0 not at 1
} catch (e: Exception) {
log.error("Could not parse dateString '$dateString'", e)
}
}
return DateFormat.parse(dateString) // fallback to not thread-safe SimpleDateFormat. Works in most cases but not all
}
protected open fun parseAmount(amountString: String): BigDecimal {