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/*
* Copyright (c) 2022, 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 8298184
* @compile GenericRecordDeconstructionPattern.java
* @run main GenericRecordDeconstructionPattern
*/
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
public class GenericRecordDeconstructionPattern {
public static void main(String... args) throws Throwable {
new GenericRecordDeconstructionPattern().run();
}
void run() {
runTest(this::runIf);
runTest(this::runSwitch);
runTest(this::runSwitchExpression);
runTest(this::runSwitchInference1);
runTest(this::runSwitchInference2);
runTest(this::runSwitchInference3);
runTest(this::runSwitchInference4);
testInference3();
assertEquals(1, runIfSuperBound(new Box<>(new StringBuilder())));
assertEquals(1, runIfSuperBound(new Box<>(0)));
}
void runTest(Function<Box<String>, Integer> test) {
Box<String> b = new Box<>(null);
assertEquals(1, test.apply(b));
}
int runIf(Box<String> b) {
if (b instanceof Box<String>(String s)) return 1;
return -1;
}
int runSwitch(Box<String> b) {
switch (b) {
case Box<String>(String s): return 1;
default: return -1;
}
}
int runSwitchExpression(Box<String> b) {
return switch (b) {
case Box<String>(String s) -> 1;
default -> -1;
};
}
int runSwitchInference1(I<String> b) {
switch (b) {
case Box(String s): return s == null ? 1 : s.length();
default: return -1;
}
}
int runSwitchInference2(I<String> b) {
switch (b) {
case Box(var s): return s == null ? 1 : s.length();
default: return -1;
}
}
int runSwitchInference3(I<String> b) {
return b instanceof Box(var s) ? s == null ? 1 : s.length()
: -1;
}
<Z extends I<String>> int runSwitchInference4(Z b) {
return b instanceof Box(var s) ? s == null ? 1 : s.length()
: -1;
}
<B extends CharSequence & Runnable, Z extends I<B>> int runSwitchInference5(Z b) {
return b instanceof Box(var s) ? s == null ? 1 : s.length()
: -1;
}
void testInference3() {
I<I<String>> b = new Box<>(new Box<>(null));
assertEquals(1, runSwitchInferenceNested(b));
}
int runSwitchInferenceNested(I<I<String>> b) {
switch (b) {
case Box(Box(var s)): return s == null ? 1 : s.length();
default: return -1;
}
}
int runIfSuperBound(I<? super String> b) {
if (b instanceof Box(var v)) return 1;
return -1;
}
sealed interface I<T> {}
record Box<V>(V v) implements I<V> {
}
void assertEquals(Object expected, Object actual) {
if (!Objects.equals(expected, actual)) {
throw new AssertionError("Expected: " + expected + "," +
"got: " + actual);
}
}
void fail(String message) {
throw new AssertionError(message);
}
public static class TestPatternFailed extends AssertionError {
public TestPatternFailed(String message) {
super(message);
}
}
}
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