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/*
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 4033662
* @summary test for limit on Calendar
* @library /java/text/testlib
* @run main CalendarLimitTest -verbose
*/
import java.util.*;
import java.text.*;
/**
* This test verifies the behavior of Calendar around the very earliest limits
* which it can handle. It also verifies the behavior for large values of millis.
*
* Note: There used to be a limit, due to a bug, for early times. There is
* currently no limit.
*
* March 17, 1998: Added code to make sure big + dates are big + AD years, and
* big - dates are big + BC years.
*/
public class CalendarLimitTest extends IntlTest
{
// This number determined empirically; this is the old limit,
// which we test for to make sure it isn't there anymore.
static final long EARLIEST_SUPPORTED_MILLIS = -210993120000000L;
static final int EPOCH_JULIAN_DAY = 2440588; // Jaunary 1, 1970 (Gregorian)
static final int JAN_1_1_JULIAN_DAY = 1721426; // January 1, year 1 (Gregorian)
// Useful millisecond constants
static final int ONE_SECOND = 1000;
static final int ONE_MINUTE = 60*ONE_SECOND;
static final int ONE_HOUR = 60*ONE_MINUTE;
static final int ONE_DAY = 24*ONE_HOUR;
static final int ONE_WEEK = 7*ONE_DAY;
static final long ONE_YEAR = (long)(365.2425 * ONE_DAY);
static long ORIGIN; // This is the *approximate* point at which BC switches to AD
public static void main(String argv[]) throws Exception {
Locale locale = Locale.getDefault();
if (!TestUtils.usesGregorianCalendar(locale)) {
System.out.println("Skipping this test because locale is " + locale);
return;
}
new CalendarLimitTest().run(argv);
}
/**
* Converts Julian day to time as milliseconds.
* @param julian the given Julian day number.
* @return time as milliseconds.
*/
private static final long julianDayToMillis(long julian) {
return (julian - EPOCH_JULIAN_DAY) * ONE_DAY;
}
/**
* Verify that the given time is processed without problem.
* @return the adjust year, with 0 = 1 BC, -1 = 2 BC, etc.
*/
int test(long millis, Calendar cal, DateFormat fmt)
{
Exception exception = null;
String theDate = "";
try {
Date d= new Date(millis);
cal.setTime(d);
theDate = fmt.format(d);
}
catch (IllegalArgumentException e) {
exception = e;
}
String s = "0x" + Long.toHexString(millis) + " " + theDate;
int era=cal.get(Calendar.ERA), year=cal.get(Calendar.YEAR),
dom=cal.get(Calendar.DATE), mon=cal.get(Calendar.MONTH);
cal.clear();
cal.set(year, mon, dom);
cal.set(Calendar.ERA, era);
Date rt = cal.getTime();
boolean ok = true;
if (exception != null) {
errln("FAIL: Exception " + s);
ok = false;
}
if (((millis >= ORIGIN) && (era != GregorianCalendar.AD)) ||
((millis < ORIGIN) && (era != GregorianCalendar.BC)) ||
(year < 1)) {
errln("FAIL: Bad year/era " + s);
ok = false;
}
if (dom<1 || dom>31) {
errln("FAIL: Bad DOM " + s);
ok = false;
}
if (Math.abs(millis - rt.getTime()) > ONE_DAY) {
errln("FAIL: RT fail " + s + " -> 0x" +
Long.toHexString(rt.getTime()) + " " +
fmt.format(rt));
ok = false;
}
if (ok) logln(s);
if (era==GregorianCalendar.BC) year = 1-year;
return year;
}
public void TestCalendarLimit()
{
ORIGIN = julianDayToMillis(JAN_1_1_JULIAN_DAY);
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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