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