86 lines
3.6 KiB
Java
86 lines
3.6 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8174399
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* @summary LambdaMetafactory should be able to handle inherited methods as 'implMethod'
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*/
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import java.lang.ReflectiveOperationException;
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import java.lang.invoke.*;
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public class InheritedMethodTest {
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public static MethodType mt(Class<?> ret, Class<?>... params) { return MethodType.methodType(ret, params); }
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public interface StringFactory {
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String get();
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}
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public interface I {
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String iString();
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}
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public interface J extends I {}
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public static abstract class C implements I {}
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public static class D extends C implements J {
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public String toString() { return "a"; }
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public String iString() { return "b"; }
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}
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private static final MethodHandles.Lookup lookup = MethodHandles.lookup();
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public static void main(String... args) throws Throwable {
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test(lookup.findVirtual(C.class, "toString", mt(String.class)), "a");
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test(lookup.findVirtual(C.class, "iString", mt(String.class)), "b");
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test(lookup.findVirtual(J.class, "toString", mt(String.class)), "a");
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test(lookup.findVirtual(J.class, "iString", mt(String.class)), "b");
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test(lookup.findVirtual(I.class, "toString", mt(String.class)), "a");
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test(lookup.findVirtual(I.class, "iString", mt(String.class)), "b");
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}
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static void test(MethodHandle implMethod, String expected) throws Throwable {
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testMetafactory(implMethod, expected);
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testAltMetafactory(implMethod, expected);
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}
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static void testMetafactory(MethodHandle implMethod, String expected) throws Throwable {
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CallSite cs = LambdaMetafactory.metafactory(lookup, "get", mt(StringFactory.class, D.class), mt(String.class),
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implMethod, mt(String.class));
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StringFactory factory = (StringFactory) cs.dynamicInvoker().invokeExact(new D());
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String actual = factory.get();
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if (!expected.equals(actual)) throw new AssertionError("Unexpected result: " + actual);
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}
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static void testAltMetafactory(MethodHandle implMethod, String expected) throws Throwable {
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CallSite cs = LambdaMetafactory.altMetafactory(lookup, "get", mt(StringFactory.class, D.class), mt(String.class),
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implMethod, mt(String.class), LambdaMetafactory.FLAG_SERIALIZABLE);
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StringFactory factory = (StringFactory) cs.dynamicInvoker().invokeExact(new D());
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String actual = factory.get();
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if (!expected.equals(actual)) throw new AssertionError("Unexpected result: " + actual);
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}
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}
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