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/*
* Copyright (c) 2018, 2025, 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 8214031 8357361
* @summary Verify various corner cases with nested switch expressions.
* @compile ExpressionSwitchBugsInGen.java
* @run main ExpressionSwitchBugsInGen
*/
import java.util.Objects;
public class ExpressionSwitchBugsInGen {
public static void main(String... args) {
new ExpressionSwitchBugsInGen().test(0, 0, 0, false);
new ExpressionSwitchBugsInGen().test(0, 0, 1, true);
new ExpressionSwitchBugsInGen().test(0, 1, 1, false);
new ExpressionSwitchBugsInGen().test(1, 1, -1, true);
new ExpressionSwitchBugsInGen().test(1, 12, -1, false);
new ExpressionSwitchBugsInGen().testCommonSuperType(0, "a", new StringBuilder(), "a");
new ExpressionSwitchBugsInGen().testCommonSuperType(1, "", new StringBuilder("a"), "a");
new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(0, null, -1);
new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(1, "", 0);
new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(1, 1, 1);
new ExpressionSwitchBugsInGen().testIntBoxing(0, 10, 10);
new ExpressionSwitchBugsInGen().testIntBoxing(1, 10, -1);
new ExpressionSwitchBugsInGen().testSwitchExpressionTypeErased(0);
new ExpressionSwitchBugsInGen().testSwitchExpressionTypeErased(1);
}
private void test(int a, int b, int c, boolean expected) {
if ( !(switch (a) {
case 0 -> b == (switch (c) { case 0 -> 0; default -> 1; });
default -> b == 12;
})) {
if (!expected) {
throw new IllegalStateException();
}
} else {
if (expected) {
throw new IllegalStateException();
}
}
}
private void testCommonSuperType(int a, String s1, StringBuilder s2, String expected) {
String r = (switch (a) {
case 0 -> s1;
default -> s2;
}).toString();
if (!expected.equals(r)) {
throw new IllegalStateException();
}
}
private void testSwitchExpressionInConditional(int a, Object o, int expected) {
int v = a == 0 ? -1
: switch (o instanceof String ? 0 : 1) {
case 0 -> 0;
default -> 1;
};
if (v != expected) {
throw new IllegalStateException();
}
}
private void testIntBoxing(int a, Integer res, int expected) {
int r = switch (a) {
case 0 -> res;
default -> -1;
};
if (r != expected) {
throw new IllegalStateException();
}
}
//JDK-8357361:
private void testSwitchExpressionTypeErased(int i) {
interface Readable<R extends String> {
R getReader();
}
Readable<?> readable = () -> "";
var v = switch (i) {
case 0 -> readable.getReader();
default -> null;
};
var expected = i == 0 ? "" : null;
if (!Objects.equals(v, expected)) {
throw new IllegalStateException("Expected: " + expected +
", got: " + v);
}
}
}
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