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/*
* Copyright (c) 2017, 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 8174399
* @summary LambdaMetafactory should be able to handle inherited methods as 'implMethod'
*/
import java.lang.ReflectiveOperationException;
import java.lang.invoke.*;
public class InheritedMethodTest {
public static MethodType mt(Class<?> ret, Class<?>... params) { return MethodType.methodType(ret, params); }
public interface StringFactory {
String get();
}
public interface I {
String iString();
}
public interface J extends I {}
public static abstract class C implements I {}
public static class D extends C implements J {
public String toString() { return "a"; }
public String iString() { return "b"; }
}
private static final MethodHandles.Lookup lookup = MethodHandles.lookup();
public static void main(String... args) throws Throwable {
test(lookup.findVirtual(C.class, "toString", mt(String.class)), "a");
test(lookup.findVirtual(C.class, "iString", mt(String.class)), "b");
test(lookup.findVirtual(J.class, "toString", mt(String.class)), "a");
test(lookup.findVirtual(J.class, "iString", mt(String.class)), "b");
test(lookup.findVirtual(I.class, "toString", mt(String.class)), "a");
test(lookup.findVirtual(I.class, "iString", mt(String.class)), "b");
}
static void test(MethodHandle implMethod, String expected) throws Throwable {
testMetafactory(implMethod, expected);
testAltMetafactory(implMethod, expected);
}
static void testMetafactory(MethodHandle implMethod, String expected) throws Throwable {
CallSite cs = LambdaMetafactory.metafactory(lookup, "get", mt(StringFactory.class, D.class), mt(String.class),
implMethod, mt(String.class));
StringFactory factory = (StringFactory) cs.dynamicInvoker().invokeExact(new D());
String actual = factory.get();
if (!expected.equals(actual)) throw new AssertionError("Unexpected result: " + actual);
}
static void testAltMetafactory(MethodHandle implMethod, String expected) throws Throwable {
CallSite cs = LambdaMetafactory.altMetafactory(lookup, "get", mt(StringFactory.class, D.class), mt(String.class),
implMethod, mt(String.class), LambdaMetafactory.FLAG_SERIALIZABLE);
StringFactory factory = (StringFactory) cs.dynamicInvoker().invokeExact(new D());
String actual = factory.get();
if (!expected.equals(actual)) throw new AssertionError("Unexpected result: " + actual);
}
}
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