/** *ThistestverifiesthebehaviorofCalendararoundtheveryearliestlimits *whichitcanhandle.Italsoverifiesthebehaviorforlargevaluesofmillis. * *Note:Thereusedtobealimit,duetoabug,forearlytimes.Thereis *currentlynolimit. * *March17,1998:Addedcodetomakesurebig+datesarebig+ADyears,and *big-datesarebig+BCyears.
*/ publicclass CalendarLimitTest extends IntlTest
{ // This number determined empirically; this is the old limit, // which we test for to make sure it isn't there anymore. staticfinallong EARLIEST_SUPPORTED_MILLIS = -210993120000000L;
staticfinalint EPOCH_JULIAN_DAY = 2440588; // Jaunary 1, 1970 (Gregorian) staticfinalint JAN_1_1_JULIAN_DAY = 1721426; // January 1, year 1 (Gregorian)
staticlong ORIGIN; // This is the *approximate* point at which BC switches to AD
publicstaticvoid main(String argv[]) throws Exception {
Locale locale = Locale.getDefault(); if (!TestUtils.usesGregorianCalendar(locale)) {
System.out.println("Skipping this test because locale is " + locale); return;
}
Calendar cal = Calendar.getInstance(); // You must set the time zone to GMT+0 or the edge cases like // Long.MIN_VALUE, Long.MAX_VALUE, and right around the threshold // won't work, since before converting to fields the calendar code // will add the offset for the zone.
cal.setTimeZone(TimeZone.getTimeZone("Africa/Casablanca"));
DateFormat dateFormat = DateFormat.getDateInstance();
dateFormat.setCalendar(cal); // Make sure you do this -- same reason as above
((SimpleDateFormat)dateFormat).applyPattern("MMM d, yyyy G");
// Don't expect any failure for positive longs int lastYear=0; boolean first=true; for (long m = Long.MAX_VALUE; m > 0; m >>= 1)
{ int y = test(m, cal, dateFormat); if (!first && y > lastYear)
errln("FAIL: Years should be decreasing " + lastYear + " " + y);
first = false;
lastYear = y;
}
// Expect failures for negative millis below threshold
first = true; for (long m = Long.MIN_VALUE; m < 0; m /= 2) // Don't use m >>= 1
{ int y = test(m, cal, dateFormat); if (!first && y < lastYear)
errln("FAIL: Years should be increasing " + lastYear + " " + y);
first = false;
lastYear = y;
}
// Test right around the threshold
test(EARLIEST_SUPPORTED_MILLIS, cal, dateFormat);
test(EARLIEST_SUPPORTED_MILLIS-1, cal, dateFormat);
// Test a date that should work
test(Long.MIN_VALUE + ONE_DAY, cal, dateFormat);
// Try hours in the earliest day or two // JUST FOR DEBUGGING: if (false) {
((SimpleDateFormat)dateFormat).applyPattern("H:mm MMM d, yyyy G"); for (int dom=2; dom<=3; ++dom) { for (int h=0; h<24; ++h) {
cal.clear();
cal.set(Calendar.ERA, GregorianCalendar.BC);
cal.set(292269055, Calendar.DECEMBER, dom, h, 0);
Date d = cal.getTime();
cal.setTime(d);
logln("" + h + ":00 Dec "+dom+", 292269055 BC -> " + Long.toHexString(d.getTime()) + " -> " +
dateFormat.format(cal.getTime()));
}
} // Other way long t = 0x80000000018c5c00L; // Dec 3, 292269055 BC while (t<0) {
cal.setTime(new Date(t));
logln("0x" + Long.toHexString(t) + " -> " +
dateFormat.format(cal.getTime()));
t -= ONE_HOUR;
}
}
}
}
//eof
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