1 /*
  2  * Copyright (c) 2023, 2025, 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 import static org.junit.jupiter.api.Assertions.*;
 25 
 26 import org.junit.jupiter.api.Test;
 27 import org.junit.jupiter.params.provider.MethodSource;
 28 import org.junit.jupiter.params.ParameterizedTest;
 29 
 30 import jdk.internal.misc.PreviewFeatures;
 31 
 32 import java.util.Arrays;
 33 import java.util.stream.Stream;
 34 
 35 import java.time.Duration;
 36 import java.time.Instant;
 37 import java.time.LocalDate;
 38 import java.time.LocalDateTime;
 39 import java.time.LocalTime;
 40 import java.time.MonthDay;
 41 import java.time.OffsetDateTime;
 42 import java.time.OffsetTime;
 43 import java.util.Optional;
 44 import java.util.OptionalDouble;
 45 import java.util.OptionalInt;
 46 import java.util.OptionalLong;
 47 import java.time.Period;
 48 import java.time.Year;
 49 import java.time.YearMonth;
 50 import java.time.ZonedDateTime;
 51 
 52 /*
 53  * @test
 54  * @summary Test that classes are value classes or not depending on --enable-preview
 55  * @modules java.base/jdk.internal.misc
 56  * @run junit/othervm -Xlog --enable-preview UseValueClassTest
 57  * @run junit/othervm -Xlog UseValueClassTest
 58  */
 59 
 60 public class UseValueClassTest {
 61 
 62     // Classes to be checked
 63     private static Stream<Class<?>> classProvider() {
 64         Class<?>[] classes = {
 65                 Byte.class,
 66                 Short.class,
 67                 Integer.class,
 68                 Long.class,
 69                 Float.class,
 70                 Double.class,
 71                 Boolean.class,
 72                 Character.class,
 73                 Number.class,
 74                 Record.class,
 75                 Duration.class,
 76                 Instant.class,
 77                 LocalDate.class,
 78                 LocalDateTime.class,
 79                 LocalTime.class,
 80                 MonthDay.class,
 81                 OffsetDateTime.class,
 82                 OffsetTime.class,
 83                 Optional.class,
 84                 OptionalDouble.class,
 85                 OptionalInt.class,
 86                 OptionalLong.class,
 87                 Period.class,
 88                 Year.class,
 89                 YearMonth.class,
 90                 ZonedDateTime.class,
 91         };
 92         return Arrays.stream(classes, 0, classes.length);
 93     }
 94 
 95     /**
 96      * Verify that the class is a value class if --enable-preview is true
 97      * @param clazz a class
 98      */
 99     @ParameterizedTest
100     @MethodSource("classProvider")
101     public void testValue(Class<?> clazz) {
102         System.out.printf("isPreview: %s%n", PreviewFeatures.isEnabled());
103         assertEquals(PreviewFeatures.isEnabled(), clazz.isValue(), clazz.getName());
104     }
105 }