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/*
* Copyright (c) 2004, 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 5090555 5091805
* @summary Make sure that rolling DAY_OF_WEEK stays in the same week
* around year boundaries.
* @run main/othervm RollDayOfWeekTest 5 5
*/
import java.util.*;
import static java.util.Calendar.*;
// Usage: java RollDayOfWeekTest [pastYears futureYears]
public class RollDayOfWeekTest {
public static void main(String[] args) {
int pastYears = 5, futureYears = 23;
if (args.length == 2) {
pastYears = Integer.parseInt(args[0]);
pastYears = Math.max(1, Math.min(pastYears, 5));
futureYears = Integer.parseInt(args[1]);
futureYears = Math.max(1, Math.min(futureYears, 28));
}
System.out.printf("Test [%d .. %+d] year range.%n", -pastYears, futureYears);
Calendar cal = new GregorianCalendar();
int year = cal.get(YEAR) - pastYears;
// Use the all combinations of firstDayOfWeek and
// minimalDaysInFirstWeek values in the year range current
// year - pastYears to current year + futureYears.
for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
for (int mdifw = 1; mdifw <= 7; mdifw++) {
cal.clear();
cal.setFirstDayOfWeek(fdw);
cal.setMinimalDaysInFirstWeek(mdifw);
cal.set(year, JANUARY, 1);
checkRoll(cal, futureYears);
}
}
// testing roll from BCE to CE
year = -1;
for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
for (int mdifw = 1; mdifw <= 7; mdifw++) {
cal.clear();
cal.setFirstDayOfWeek(fdw);
cal.setMinimalDaysInFirstWeek(mdifw);
cal.set(year, JANUARY, 1);
checkRoll(cal, 4);
}
}
}
static void checkRoll(Calendar cal, int years) {
Calendar cal2 = null, cal3 = null, prev = null;
// Check 28 years
for (int x = 0; x < (int)(365.2425*years); x++) {
cal2 = (Calendar) cal.clone();
cal3 = (Calendar) cal.clone();
// roll foreword
for (int i = 0; i < 10; i++) {
prev = (Calendar) cal2.clone();
cal2.roll(Calendar.DAY_OF_WEEK, +1);
roll(cal3, +1);
long t2 = cal2.getTimeInMillis();
long t3 = cal3.getTimeInMillis();
if (t2 != t3) {
System.err.println("prev: " + prev.getTime() + "\n" + prev);
System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
throw new RuntimeException("+1: t2=" + t2 + ", t3=" + t3);
}
}
// roll backward
for (int i = 0; i < 10; i++) {
prev = (Calendar) cal2.clone();
cal2.roll(Calendar.DAY_OF_WEEK, -1);
roll(cal3, -1);
long t2 = cal2.getTimeInMillis();
long t3 = cal3.getTimeInMillis();
if (t2 != t3) {
System.err.println("prev: " + prev.getTime() + "\n" + prev);
System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
throw new RuntimeException("-1: t2=" + t2 + ", t3=" + t3);
}
}
cal.add(DAY_OF_YEAR, +1);
}
}
// Another way to roll within the same week.
static void roll(Calendar cal, int n) {
int doy = cal.get(DAY_OF_YEAR);
int diff = cal.get(DAY_OF_WEEK) - cal.getFirstDayOfWeek();
if (diff < 0) {
diff += 7;
}
// dow1: first day of the week
int dow1 = doy - diff;
n %= 7;
doy += n;
if (doy < dow1) {
doy += 7;
} else if (doy >= dow1 + 7) {
doy -= 7;
}
cal.set(DAY_OF_YEAR, doy);
}
}
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