138 lines
5.0 KiB
Java
138 lines
5.0 KiB
Java
/*
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* Copyright (c) 2004, 2016, 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 5090555 5091805
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* @summary Make sure that rolling DAY_OF_WEEK stays in the same week
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* around year boundaries.
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* @run main/othervm RollDayOfWeekTest 5 5
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*/
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import java.util.*;
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import static java.util.Calendar.*;
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// Usage: java RollDayOfWeekTest [pastYears futureYears]
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public class RollDayOfWeekTest {
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public static void main(String[] args) {
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int pastYears = 5, futureYears = 23;
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if (args.length == 2) {
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pastYears = Integer.parseInt(args[0]);
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pastYears = Math.max(1, Math.min(pastYears, 5));
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futureYears = Integer.parseInt(args[1]);
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futureYears = Math.max(1, Math.min(futureYears, 28));
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}
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System.out.printf("Test [%d .. %+d] year range.%n", -pastYears, futureYears);
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Calendar cal = new GregorianCalendar();
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int year = cal.get(YEAR) - pastYears;
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// Use the all combinations of firstDayOfWeek and
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// minimalDaysInFirstWeek values in the year range current
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// year - pastYears to current year + futureYears.
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for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
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for (int mdifw = 1; mdifw <= 7; mdifw++) {
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cal.clear();
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cal.setFirstDayOfWeek(fdw);
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cal.setMinimalDaysInFirstWeek(mdifw);
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cal.set(year, JANUARY, 1);
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checkRoll(cal, futureYears);
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}
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}
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// testing roll from BCE to CE
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year = -1;
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for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
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for (int mdifw = 1; mdifw <= 7; mdifw++) {
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cal.clear();
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cal.setFirstDayOfWeek(fdw);
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cal.setMinimalDaysInFirstWeek(mdifw);
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cal.set(year, JANUARY, 1);
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checkRoll(cal, 4);
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}
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}
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}
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static void checkRoll(Calendar cal, int years) {
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Calendar cal2 = null, cal3 = null, prev = null;
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// Check 28 years
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for (int x = 0; x < (int)(365.2425*years); x++) {
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cal2 = (Calendar) cal.clone();
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cal3 = (Calendar) cal.clone();
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// roll foreword
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for (int i = 0; i < 10; i++) {
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prev = (Calendar) cal2.clone();
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cal2.roll(Calendar.DAY_OF_WEEK, +1);
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roll(cal3, +1);
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long t2 = cal2.getTimeInMillis();
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long t3 = cal3.getTimeInMillis();
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if (t2 != t3) {
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System.err.println("prev: " + prev.getTime() + "\n" + prev);
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System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
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System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
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throw new RuntimeException("+1: t2=" + t2 + ", t3=" + t3);
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}
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}
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// roll backward
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for (int i = 0; i < 10; i++) {
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prev = (Calendar) cal2.clone();
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cal2.roll(Calendar.DAY_OF_WEEK, -1);
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roll(cal3, -1);
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long t2 = cal2.getTimeInMillis();
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long t3 = cal3.getTimeInMillis();
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if (t2 != t3) {
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System.err.println("prev: " + prev.getTime() + "\n" + prev);
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System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
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System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
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throw new RuntimeException("-1: t2=" + t2 + ", t3=" + t3);
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}
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}
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cal.add(DAY_OF_YEAR, +1);
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}
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}
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// Another way to roll within the same week.
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static void roll(Calendar cal, int n) {
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int doy = cal.get(DAY_OF_YEAR);
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int diff = cal.get(DAY_OF_WEEK) - cal.getFirstDayOfWeek();
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if (diff < 0) {
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diff += 7;
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}
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// dow1: first day of the week
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int dow1 = doy - diff;
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n %= 7;
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doy += n;
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if (doy < dow1) {
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doy += 7;
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} else if (doy >= dow1 + 7) {
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doy -= 7;
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}
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cal.set(DAY_OF_YEAR, doy);
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}
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}
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