1 /* 2 * Copyright (c) 2011, 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 6936350 27 * @summary Test case for TimeZone.observesDaylightTime() 28 */ 29 30 import java.util.*; 31 import static java.util.GregorianCalendar.*; 32 33 public class DaylightTimeTest { 34 private static final int ONE_HOUR = 60 * 60 * 1000; // one hour 35 private static final int INTERVAL = 24 * ONE_HOUR; // one day 36 private static final String[] ZONES = TimeZone.getAvailableIDs(); 37 private static int errors = 0; 38 main(String[] args)39 public static void main(String[] args) { 40 41 // Test default TimeZone 42 for (String id : ZONES) { 43 TimeZone tz = TimeZone.getTimeZone(id); 44 long now = System.currentTimeMillis(); 45 boolean observes = tz.observesDaylightTime(); 46 boolean found = findDSTTransition(tz, now); 47 if (observes != found) { 48 // There's a critical section. If DST ends after the 49 // System.currentTimeMills() call, there should be 50 // inconsistency in the determination. Try the same 51 // thing again to see the inconsistency was due to the 52 // critical section. 53 now = System.currentTimeMillis(); 54 observes = tz.observesDaylightTime(); 55 found = findDSTTransition(tz, now); 56 if (observes != found) { 57 System.err.printf("%s: observesDaylightTime() should return %s at %d%n", 58 tz.getID(), found, now); 59 errors++; 60 } 61 } 62 } 63 64 // Test SimpleTimeZone in which observesDaylightTime() is 65 // equivalent to useDaylightTime(). 66 testSimpleTimeZone(new SimpleTimeZone(-8*ONE_HOUR, "X", 67 APRIL, 1, -SUNDAY, 2*ONE_HOUR, 68 OCTOBER, -1, SUNDAY, 2*ONE_HOUR, 69 1*ONE_HOUR)); 70 testSimpleTimeZone(new SimpleTimeZone(-8*ONE_HOUR, "Y")); 71 72 if (errors > 0) { 73 throw new RuntimeException("DaylightTimeTest: failed"); 74 } 75 } 76 77 /** 78 * Returns true if it's `now' in DST or there's any 79 * standard-to-daylight transition within 50 years after `now'. 80 */ findDSTTransition(TimeZone tz, long now)81 private static boolean findDSTTransition(TimeZone tz, long now) { 82 GregorianCalendar cal = new GregorianCalendar(tz, Locale.US); 83 cal.setTimeInMillis(now); 84 cal.add(YEAR, 50); 85 long end = cal.getTimeInMillis(); 86 87 for (long t = now; t < end; t += INTERVAL) { 88 cal.setTimeInMillis(t); 89 if (cal.get(DST_OFFSET) > 0) { 90 return true; 91 } 92 } 93 return false; 94 } 95 testSimpleTimeZone(SimpleTimeZone stz)96 private static void testSimpleTimeZone(SimpleTimeZone stz) { 97 if (stz.useDaylightTime() != stz.observesDaylightTime()) { 98 System.err.printf("Failed: useDaylightTime=%b, observesDaylightTime()=%b%n\t%s%n", 99 stz.useDaylightTime(),stz.observesDaylightTime(), stz); 100 errors++; 101 } 102 } 103 } 104