1 /*
2 * Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 5090555 5091805
27 * @summary Make sure that rolling DAY_OF_WEEK stays in the same week
28 * around year boundaries.
29 * @run main/othervm RollDayOfWeekTest 5 5
30 */
31
32 import java.util.*;
33
34 import static java.util.Calendar.*;
35
36 // Usage: java RollDayOfWeekTest [pastYears futureYears]
37 public class RollDayOfWeekTest {
38 public static void main(String[] args) {
39 int pastYears = 5, futureYears = 23;
40 if (args.length == 2) {
41 pastYears = Integer.parseInt(args[0]);
42 pastYears = Math.max(1, Math.min(pastYears, 5));
43 futureYears = Integer.parseInt(args[1]);
44 futureYears = Math.max(1, Math.min(futureYears, 28));
45 }
46
47 System.out.printf("Test [%d .. %+d] year range.%n", -pastYears, futureYears);
48 Calendar cal = new GregorianCalendar();
49 int year = cal.get(YEAR) - pastYears;
50
51 // Use the all combinations of firstDayOfWeek and
52 // minimalDaysInFirstWeek values in the year range current
53 // year - pastYears to current year + futureYears.
54 for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
55 for (int mdifw = 1; mdifw <= 7; mdifw++) {
56 cal.clear();
57 cal.setFirstDayOfWeek(fdw);
58 cal.setMinimalDaysInFirstWeek(mdifw);
59 cal.set(year, JANUARY, 1);
60 checkRoll(cal, futureYears);
61 }
62 }
63
64 // testing roll from BCE to CE
65 year = -1;
66 for (int fdw = SUNDAY; fdw <= SATURDAY; fdw++) {
67 for (int mdifw = 1; mdifw <= 7; mdifw++) {
68 cal.clear();
69 cal.setFirstDayOfWeek(fdw);
70 cal.setMinimalDaysInFirstWeek(mdifw);
71 cal.set(year, JANUARY, 1);
72 checkRoll(cal, 4);
73 }
74 }
75 }
76
77
78 static void checkRoll(Calendar cal, int years) {
79 Calendar cal2 = null, cal3 = null, prev = null;
80 // Check 28 years
81 for (int x = 0; x < (int)(365.2425*years); x++) {
82 cal2 = (Calendar) cal.clone();
83 cal3 = (Calendar) cal.clone();
84
85 // roll foreword
86 for (int i = 0; i < 10; i++) {
87 prev = (Calendar) cal2.clone();
88 cal2.roll(Calendar.DAY_OF_WEEK, +1);
89 roll(cal3, +1);
90 long t2 = cal2.getTimeInMillis();
91 long t3 = cal3.getTimeInMillis();
92 if (t2 != t3) {
93 System.err.println("prev: " + prev.getTime() + "\n" + prev);
94 System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
95 System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
96 throw new RuntimeException("+1: t2=" + t2 + ", t3=" + t3);
97 }
98 }
99
100 // roll backward
101 for (int i = 0; i < 10; i++) {
102 prev = (Calendar) cal2.clone();
103 cal2.roll(Calendar.DAY_OF_WEEK, -1);
104 roll(cal3, -1);
105 long t2 = cal2.getTimeInMillis();
106 long t3 = cal3.getTimeInMillis();
107 if (t2 != t3) {
108 System.err.println("prev: " + prev.getTime() + "\n" + prev);
109 System.err.println("cal2: " + cal2.getTime() + "\n" + cal2);
110 System.err.println("cal3: " + cal3.getTime() + "\n" + cal3);
111 throw new RuntimeException("-1: t2=" + t2 + ", t3=" + t3);
112 }
113 }
114 cal.add(DAY_OF_YEAR, +1);
115 }
116 }
117
118 // Another way to roll within the same week.
119 static void roll(Calendar cal, int n) {
120 int doy = cal.get(DAY_OF_YEAR);
121 int diff = cal.get(DAY_OF_WEEK) - cal.getFirstDayOfWeek();
122 if (diff < 0) {
123 diff += 7;
124 }
125
126 // dow1: first day of the week
127 int dow1 = doy - diff;
128 n %= 7;
129 doy += n;
130 if (doy < dow1) {
131 doy += 7;
132 } else if (doy >= dow1 + 7) {
133 doy -= 7;
134 }
135 cal.set(DAY_OF_YEAR, doy);
136 }
137 }