209 lines
7.4 KiB
Java
209 lines
7.4 KiB
Java
/*
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* Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 4033662
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* @summary test for limit on Calendar
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* @library /java/text/testlib
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* @run junit CalendarLimitTest
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*/
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import java.util.*;
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import java.text.*;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.fail;
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/**
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* This test verifies the behavior of Calendar around the very earliest limits
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* which it can handle. It also verifies the behavior for large values of millis.
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*
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* Note: There used to be a limit, due to a bug, for early times. There is
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* currently no limit.
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*
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* March 17, 1998: Added code to make sure big + dates are big + AD years, and
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* big - dates are big + BC years.
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*/
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public class CalendarLimitTest
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{
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// This number determined empirically; this is the old limit,
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// which we test for to make sure it isn't there anymore.
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static final long EARLIEST_SUPPORTED_MILLIS = -210993120000000L;
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static final int EPOCH_JULIAN_DAY = 2440588; // Jaunary 1, 1970 (Gregorian)
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static final int JAN_1_1_JULIAN_DAY = 1721426; // January 1, year 1 (Gregorian)
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// Useful millisecond constants
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static final int ONE_SECOND = 1000;
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static final int ONE_MINUTE = 60*ONE_SECOND;
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static final int ONE_HOUR = 60*ONE_MINUTE;
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static final int ONE_DAY = 24*ONE_HOUR;
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static final int ONE_WEEK = 7*ONE_DAY;
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static final long ONE_YEAR = (long)(365.2425 * ONE_DAY);
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static long ORIGIN; // This is the *approximate* point at which BC switches to AD
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/**
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* Converts Julian day to time as milliseconds.
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* @param julian the given Julian day number.
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* @return time as milliseconds.
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*/
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private static final long julianDayToMillis(long julian) {
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return (julian - EPOCH_JULIAN_DAY) * ONE_DAY;
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}
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/**
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* Verify that the given time is processed without problem.
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* @return the adjust year, with 0 = 1 BC, -1 = 2 BC, etc.
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*/
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int test(long millis, Calendar cal, DateFormat fmt)
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{
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Exception exception = null;
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String theDate = "";
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try {
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Date d= new Date(millis);
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cal.setTime(d);
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theDate = fmt.format(d);
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}
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catch (IllegalArgumentException e) {
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exception = e;
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}
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String s = "0x" + Long.toHexString(millis) + " " + theDate;
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int era=cal.get(Calendar.ERA), year=cal.get(Calendar.YEAR),
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dom=cal.get(Calendar.DATE), mon=cal.get(Calendar.MONTH);
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cal.clear();
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cal.set(year, mon, dom);
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cal.set(Calendar.ERA, era);
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Date rt = cal.getTime();
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boolean ok = true;
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if (exception != null) {
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fail("FAIL: Exception " + s);
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ok = false;
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}
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if (((millis >= ORIGIN) && (era != GregorianCalendar.AD)) ||
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((millis < ORIGIN) && (era != GregorianCalendar.BC)) ||
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(year < 1)) {
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fail("FAIL: Bad year/era " + s);
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ok = false;
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}
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if (dom<1 || dom>31) {
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fail("FAIL: Bad DOM " + s);
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ok = false;
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}
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if (Math.abs(millis - rt.getTime()) > ONE_DAY) {
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fail("FAIL: RT fail " + s + " -> 0x" +
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Long.toHexString(rt.getTime()) + " " +
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fmt.format(rt));
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ok = false;
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}
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if (ok) System.out.println(s);
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if (era==GregorianCalendar.BC) year = 1-year;
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return year;
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}
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@Test
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public void TestCalendarLimit()
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{
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Locale locale = Locale.getDefault();
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if (!TestUtils.usesGregorianCalendar(locale)) {
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System.out.println("Skipping this test because locale is " + locale);
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return;
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}
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ORIGIN = julianDayToMillis(JAN_1_1_JULIAN_DAY);
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Calendar cal = Calendar.getInstance();
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// You must set the time zone to GMT+0 or the edge cases like
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// Long.MIN_VALUE, Long.MAX_VALUE, and right around the threshold
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// won't work, since before converting to fields the calendar code
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// will add the offset for the zone.
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cal.setTimeZone(TimeZone.getTimeZone("Africa/Casablanca"));
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DateFormat dateFormat = DateFormat.getDateInstance();
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dateFormat.setCalendar(cal); // Make sure you do this -- same reason as above
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((SimpleDateFormat)dateFormat).applyPattern("MMM d, yyyy G");
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// Don't expect any failure for positive longs
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int lastYear=0;
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boolean first=true;
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for (long m = Long.MAX_VALUE; m > 0; m >>= 1)
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{
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int y = test(m, cal, dateFormat);
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if (!first && y > lastYear)
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fail("FAIL: Years should be decreasing " + lastYear + " " + y);
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first = false;
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lastYear = y;
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}
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// Expect failures for negative millis below threshold
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first = true;
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for (long m = Long.MIN_VALUE; m < 0; m /= 2) // Don't use m >>= 1
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{
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int y = test(m, cal, dateFormat);
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if (!first && y < lastYear)
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fail("FAIL: Years should be increasing " + lastYear + " " + y);
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first = false;
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lastYear = y;
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}
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// Test right around the threshold
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test(EARLIEST_SUPPORTED_MILLIS, cal, dateFormat);
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test(EARLIEST_SUPPORTED_MILLIS-1, cal, dateFormat);
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// Test a date that should work
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test(Long.MIN_VALUE + ONE_DAY, cal, dateFormat);
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// Try hours in the earliest day or two
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// JUST FOR DEBUGGING:
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if (false) {
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((SimpleDateFormat)dateFormat).applyPattern("H:mm MMM d, yyyy G");
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for (int dom=2; dom<=3; ++dom) {
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for (int h=0; h<24; ++h) {
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cal.clear();
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cal.set(Calendar.ERA, GregorianCalendar.BC);
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cal.set(292269055, Calendar.DECEMBER, dom, h, 0);
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Date d = cal.getTime();
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cal.setTime(d);
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System.out.println("" + h + ":00 Dec "+dom+", 292269055 BC -> " +
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Long.toHexString(d.getTime()) + " -> " +
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dateFormat.format(cal.getTime()));
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}
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}
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// Other way
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long t = 0x80000000018c5c00L; // Dec 3, 292269055 BC
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while (t<0) {
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cal.setTime(new Date(t));
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System.out.println("0x" + Long.toHexString(t) + " -> " +
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dateFormat.format(cal.getTime()));
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t -= ONE_HOUR;
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}
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}
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}
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}
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//eof
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