1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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).
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  15  * You should have received a copy of the GNU General Public License version
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  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.
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  23 
  24 /**
  25  * @test
  26  * @bug 8152077
  27  * @summary Make sure that roll() with HOUR/HOUR_OF_DAY works around standard/daylight
  28  *          time transitions
  29  */
  30 
  31 import java.util.Calendar;
  32 import java.util.GregorianCalendar;
  33 import java.util.TimeZone;
  34 import static java.util.Calendar.*;
  35 
  36 public class Bug8152077 {
  37     private static final TimeZone LA = TimeZone.getTimeZone("America/Los_Angeles");
  38     private static final TimeZone BR = TimeZone.getTimeZone("America/Sao_Paulo");
  39 
  40     private static final int[] ALLDAY_HOURS = {
  41         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
  42         12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
  43     };
  44     private static final int[] AM_HOURS = {
  45         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
  46     };
  47     private static final int[] PM_HOURS = { // in 24-hour clock
  48         12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
  49     };
  50 
  51     private static int errors;
  52 
  53     public static void main(String[] args) {
  54         TimeZone initialTz = TimeZone.getDefault();
  55         try {
  56             testRoll(LA, new int[] { 2016, MARCH, 13 },
  57                      new int[] { 0, 1, 3, 4, 5, 6, 7, 8, 9, 10, 11,
  58                          12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 });
  59             testRoll(LA, new int[] { 2016, MARCH, 13 },
  60                      new int[] { 0, 1, 3, 4, 5, 6, 7, 8, 9, 10, 11 });
  61             testRoll(LA, new int[] { 2016, MARCH, 13 }, PM_HOURS);
  62 
  63             testRoll(LA, new int[] { 2016, NOVEMBER, 6 }, ALLDAY_HOURS);
  64             testRoll(LA, new int[] { 2016, NOVEMBER, 6 }, AM_HOURS);
  65             testRoll(LA, new int[] { 2016, NOVEMBER, 6 }, PM_HOURS);
  66 
  67             testRoll(BR, new int[] { 2016, FEBRUARY, 21 }, ALLDAY_HOURS);
  68             testRoll(BR, new int[] { 2016, FEBRUARY, 21 }, AM_HOURS);
  69             testRoll(BR, new int[] { 2016, FEBRUARY, 21 }, PM_HOURS);
  70 
  71             testRoll(BR, new int[] { 2016, OCTOBER, 15 }, ALLDAY_HOURS);
  72             testRoll(BR, new int[] { 2016, OCTOBER, 15 }, PM_HOURS);
  73             testRoll(BR, new int[] { 2016, OCTOBER, 16 },
  74                      new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
  75                          12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 });
  76             testRoll(BR, new int[] { 2016, OCTOBER, 16 },
  77                      new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 });
  78             testRoll(BR, new int[] { 2016, OCTOBER, 16 }, PM_HOURS);
  79         } finally {
  80             TimeZone.setDefault(initialTz);
  81         }
  82         if (errors > 0) {
  83             throw new RuntimeException("Test failed");
  84         }
  85     }
  86 
  87     private static void testRoll(TimeZone tz, int[] params, int[] sequence) {
  88         TimeZone.setDefault(tz);
  89         for (int i = 0; i < sequence.length; i++) {
  90             testRoll(+1, params, sequence, i);
  91             testRoll(-1, params, sequence, i);
  92         }
  93     }
  94 
  95     // amount must be 1 or -1.
  96     private static void testRoll(int amount, int[] params, int[] sequence, int startIndex) {
  97         int year = params[0];
  98         int month = params[1];
  99         int dayOfMonth = params[2];
 100         int hourOfDay = sequence[startIndex];
 101         Calendar cal = new GregorianCalendar(year, month, dayOfMonth,
 102                                              hourOfDay, 0, 0);
 103         int ampm = cal.get(AM_PM);
 104 
 105         int length = sequence.length;
 106         int count = length * 2;
 107         int field = (length > 12) ? HOUR_OF_DAY : HOUR;
 108 
 109         System.out.printf("roll(%s, %2d) starting from %s%n",
 110                           (field == HOUR) ? "HOUR" : "HOUR_OF_DAY", amount, cal.getTime());
 111         for (int i = 0; i < count; i++) {
 112             int index = (amount > 0) ? (startIndex + i + 1) % length
 113                                      : Math.floorMod(startIndex - i - 1, length);
 114             int expected = sequence[index];
 115             if (field == HOUR) {
 116                 expected %= 12;
 117             }
 118             cal.roll(field, amount);
 119             int value = cal.get(field);
 120             if (value != expected) {
 121                 System.out.println("Unexpected field value: got=" + value
 122                                     + ", expected=" + expected);
 123                 errors++;
 124             }
 125             if (cal.get(DAY_OF_MONTH) != dayOfMonth) {
 126                 System.out.println("DAY_OF_MONTH changed: " + dayOfMonth
 127                                     + " to " + cal.get(DAY_OF_MONTH));
 128             }
 129             if (field == HOUR && cal.get(AM_PM) != ampm) {
 130                 System.out.println("AM_PM changed: " + ampm + " to " + cal.get(AM_PM));
 131                 errors++;
 132             }
 133         }
 134     }
 135 }