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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.
*/
package p1;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandleProxies;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Arrays;
import java.util.stream.Collectors;
import p2.TestIntf;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
public class Main {
public interface A {
default String aConcat(Object... objs) { return Arrays.deepToString(objs); }
}
public interface B {
default String bConcat(Object[] objs) { return Arrays.deepToString(objs); }
}
public interface C extends A, B {
String c(Object... objs);
}
private static String concat(Object... objs) {
return Arrays.stream(objs).map(Object::toString).collect(Collectors.joining());
}
/*
* Test the invocation of default methods with varargs
*/
@Test
public static void testVarargsMethods() throws Throwable {
MethodHandle target = MethodHandles.lookup().findStatic(Main.class,
"concat", MethodType.methodType(String.class, Object[].class));
C proxy = MethodHandleProxies.asInterfaceInstance(C.class, target);
assertEquals(proxy.c("a", "b", "c"), "abc");
assertEquals(proxy.aConcat("a", "b", "c"), "[a, b, c]");
assertEquals(proxy.aConcat(new Object[] { "a", "b", "c" }), "[a, b, c]");
assertEquals(proxy.bConcat(new Object[] { "a", "b", "c" }), "[a, b, c]");
}
/*
* Test the invocation of a default method of an accessible interface
*/
@Test
public static void modulePrivateInterface() {
MethodHandle target = MethodHandles.constant(String.class, "test");
TestIntf t = MethodHandleProxies.asInterfaceInstance(TestIntf.class, target);
assertEquals(t.test(), "test");
}
}
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