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