| /* |
| * Copyright (c) 2011, 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 6936350 |
| * @summary Test case for TimeZone.observesDaylightTime() |
| */ |
| |
| import java.util.*; |
| import static java.util.GregorianCalendar.*; |
| |
| public class DaylightTimeTest { |
| private static final int ONE_HOUR = 60 * 60 * 1000; // one hour |
| private static final int INTERVAL = 24 * ONE_HOUR; // one day |
| private static final String[] ZONES = TimeZone.getAvailableIDs(); |
| private static int errors = 0; |
| |
| public static void main(String[] args) { |
| |
| // Test default TimeZone |
| for (String id : ZONES) { |
| TimeZone tz = TimeZone.getTimeZone(id); |
| long now = System.currentTimeMillis(); |
| boolean observes = tz.observesDaylightTime(); |
| boolean found = findDSTTransition(tz, now); |
| if (observes != found) { |
| // There's a critical section. If DST ends after the |
| // System.currentTimeMills() call, there should be |
| // inconsistency in the determination. Try the same |
| // thing again to see the inconsistency was due to the |
| // critical section. |
| now = System.currentTimeMillis(); |
| observes = tz.observesDaylightTime(); |
| found = findDSTTransition(tz, now); |
| if (observes != found) { |
| System.err.printf("%s: observesDaylightTime() should return %s at %d%n", |
| tz.getID(), found, now); |
| errors++; |
| } |
| } |
| } |
| |
| // Test SimpleTimeZone in which observesDaylightTime() is |
| // equivalent to useDaylightTime(). |
| testSimpleTimeZone(new SimpleTimeZone(-8*ONE_HOUR, "X", |
| APRIL, 1, -SUNDAY, 2*ONE_HOUR, |
| OCTOBER, -1, SUNDAY, 2*ONE_HOUR, |
| 1*ONE_HOUR)); |
| testSimpleTimeZone(new SimpleTimeZone(-8*ONE_HOUR, "Y")); |
| |
| if (errors > 0) { |
| throw new RuntimeException("DaylightTimeTest: failed"); |
| } |
| } |
| |
| /** |
| * Returns true if it's `now' in DST or there's any |
| * standard-to-daylight transition within 50 years after `now'. |
| */ |
| private static boolean findDSTTransition(TimeZone tz, long now) { |
| GregorianCalendar cal = new GregorianCalendar(tz, Locale.US); |
| cal.setTimeInMillis(now); |
| cal.add(YEAR, 50); |
| long end = cal.getTimeInMillis(); |
| |
| for (long t = now; t < end; t += INTERVAL) { |
| cal.setTimeInMillis(t); |
| if (cal.get(DST_OFFSET) > 0) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private static void testSimpleTimeZone(SimpleTimeZone stz) { |
| if (stz.useDaylightTime() != stz.observesDaylightTime()) { |
| System.err.printf("Failed: useDaylightTime=%b, observesDaylightTime()=%b%n\t%s%n", |
| stz.useDaylightTime(),stz.observesDaylightTime(), stz); |
| errors++; |
| } |
| } |
| } |