jdk-24/test/langtools/tools/javac/switchexpr/ExhaustiveEnumSwitch.java
Jan Lahoda eaa80ad08c 8300543: Compiler Implementation for Pattern Matching for switch
8300545: Compiler Implementation for Record Patterns

Co-authored-by: Aggelos Biboudis <abimpoudis@openjdk.org>
Reviewed-by: vromero, mcimadamore
2023-05-22 04:24:06 +00:00

83 lines
3.0 KiB
Java

/*
* Copyright (c) 2017, 2023, 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
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* questions.
*/
/*
* @test
* @bug 8206986 8243548
* @summary Verify that an switch expression over enum can be exhaustive without default.
* @compile --release 20 ExhaustiveEnumSwitch.java
* @compile ExhaustiveEnumSwitchExtra.java
* @run main ExhaustiveEnumSwitch IncompatibleClassChangeError
* @compile ExhaustiveEnumSwitch.java
* @compile ExhaustiveEnumSwitchExtra.java
* @run main ExhaustiveEnumSwitch MatchException
*/
public class ExhaustiveEnumSwitch {
public static void main(String... args) throws ClassNotFoundException {
boolean matchException = "MatchException".equals(args[0]);
new ExhaustiveEnumSwitch().run(matchException);
}
private void run(boolean matchException) throws ClassNotFoundException {
ExhaustiveEnumSwitchEnum v = ExhaustiveEnumSwitchEnum.valueOf("F");
try {
print(v);
throw new AssertionError("Expected exception did not occur.");
} catch (IncompatibleClassChangeError err) {
if (matchException) {
throw new AssertionError("Expected IncompatibleClassChangeError, but got MatchException!");
}
} catch (Exception ex) {
//cannot refer to MatchException directly, as it used to be preview API in JDK 20:
if (ex.getClass() == Class.forName("java.lang.MatchException")) {
if (!matchException) {
throw new AssertionError("Expected MatchException, but got IncompatibleClassChangeError!");
}
} else {
throw ex;
}
}
}
private String print(ExhaustiveEnumSwitchEnum t) {
return switch (t) {
case A -> "A";
case B -> "B";
};
}
}
enum ExhaustiveEnumSwitchEnum {
A, B;
class NestedClass {}
enum NestedEnum {}
interface NestedInterface {}
@interface NestedAnnotation {}
void nestedMethod() {}
static void nestedStaticMethod() {}
int nestedField;
static int nestedStaticField;
}