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/*
* Copyright (c) 2001, 2016, 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 4404619 6348819
* @summary Make sure that Calendar doesn't cause nextStamp overflow.
* @modules java.base/java.util:open
*/
import java.lang.reflect.*;
import java.util.*;
import static java.util.Calendar.*;
// Calendar fails when turning negative to positive (zero), not
// positive to negative with nextStamp. If a negative value was set to
// nextStamp, it would fail even with the fix. So, there's no way to
// reproduce the symptom in a short time -- at leaset it would take a
// couple of hours even if we started with Integer.MAX_VALUE. So, this
// test case just checks that set() calls don't cause any nextStamp
// overflow.
public class StampOverflow {
public static void main(String[] args) throws IllegalAccessException {
// Get a Field for "nextStamp".
Field nextstamp = null;
try {
nextstamp = Calendar.class.getDeclaredField("nextStamp");
} catch (NoSuchFieldException e) {
throw new RuntimeException("implementation changed?", e);
}
nextstamp.setAccessible(true);
Calendar cal = new GregorianCalendar();
int initialValue = nextstamp.getInt(cal);
// Set nextStamp to a very large number
nextstamp.setInt(cal, Integer.MAX_VALUE - 100);
for (int i = 0; i < 1000; i++) {
invoke(cal);
int stampValue = nextstamp.getInt(cal);
// nextStamp must not be less than initialValue.
if (stampValue < initialValue) {
throw new RuntimeException("invalid nextStamp: " + stampValue);
}
}
}
static void invoke(Calendar cal) {
cal.clear();
cal.set(2000, NOVEMBER, 2, 0, 0, 0);
int y = cal.get(YEAR);
int m = cal.get(MONTH);
int d = cal.get(DAY_OF_MONTH);
if (y != 2000 || m != NOVEMBER || d != 2) {
throw new RuntimeException("wrong date produced ("
+ y + "/" + (m+1) + "/" + d + ")");
}
}
}
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