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/*
* Copyright (c) 2020, 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.
*/
import java.lang.reflect.*;
import java.util.Arrays;
import java.util.stream.Collectors;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
/*
* @test
* @bug 8159746
* @summary Test invoking a default method in a non-public proxy interface
* @build p.Foo p.Bar p.ProxyMaker
* @run testng DefaultMethodProxy
*/
public class DefaultMethodProxy {
public interface I {
default String m() { return "I"; }
}
@Test
public static void publicInterface() throws ReflectiveOperationException {
// create a proxy instance of a public proxy interface should succeed
Proxy proxy = (Proxy)Proxy.newProxyInstance(DefaultMethodProxy.class.getClassLoader(),
new Class<?>[] { I.class }, IH);
testDefaultMethod(proxy, "I");
// can get the invocation handler
assertTrue(Proxy.getInvocationHandler(proxy) == IH);
}
@DataProvider(name = "nonPublicIntfs")
private static Object[][] nonPublicIntfs() throws ClassNotFoundException {
Class<?> fooClass = Class.forName("p.Foo");
Class<?> barClass = Class.forName("p.Bar");
return new Object[][]{
new Object[]{new Class<?>[]{ fooClass }, "foo"},
new Object[]{new Class<?>[]{ barClass, fooClass }, "bar"},
new Object[]{new Class<?>[]{ barClass }, "bar"},
};
}
@Test(dataProvider = "nonPublicIntfs")
public static void hasPackageAccess(Class<?>[] intfs, String expected) throws ReflectiveOperationException {
Proxy proxy = (Proxy)Proxy.newProxyInstance(DefaultMethodProxy.class.getClassLoader(), intfs, IH);
testDefaultMethod(proxy, expected);
// proxy instance is created successfully even invocation handler has no access
Proxy.newProxyInstance(DefaultMethodProxy.class.getClassLoader(), intfs, IH_NO_ACCESS);
}
// IAE thrown at invocation time
@Test(dataProvider = "nonPublicIntfs", expectedExceptions = {IllegalAccessException.class})
public static void noPackageAccess(Class<?>[] intfs, String ignored) throws Throwable {
Proxy proxy = (Proxy)Proxy.newProxyInstance(DefaultMethodProxy.class.getClassLoader(), intfs, IH_NO_ACCESS);
try {
testDefaultMethod(proxy, "dummy");
} catch (InvocationTargetException e) {
// unwrap the exception
if (e.getCause() instanceof UndeclaredThrowableException) {
Throwable cause = e.getCause();
throw cause.getCause();
}
throw e;
}
}
/*
* Verify if a default method "m" can be invoked successfully
*/
static void testDefaultMethod(Proxy proxy, String expected) throws ReflectiveOperationException {
Method m = proxy.getClass().getDeclaredMethod("m");
m.setAccessible(true);
String name = (String) m.invoke(proxy);
if (!expected.equals(name)) {
throw new RuntimeException("return value: " + name + " expected: " + expected);
}
}
// invocation handler with access to the non-public interface in package p
private static final InvocationHandler IH = (proxy, method, params) -> {
System.out.format("Proxy for %s: invoking %s%n",
Arrays.stream(proxy.getClass().getInterfaces())
.map(Class::getName)
.collect(Collectors.joining(", ")), method.getName());
if (method.isDefault()) {
return p.ProxyMaker.invoke(proxy, method, params);
}
throw new UnsupportedOperationException(method.toString());
};
// invocation handler with no access to the non-public interface in package p
// expect IllegalAccessException thrown
private static final InvocationHandler IH_NO_ACCESS = (proxy, method, params) -> {
System.out.format("Proxy for %s: invoking %s%n",
Arrays.stream(proxy.getClass().getInterfaces())
.map(Class::getName)
.collect(Collectors.joining(", ")), method.getName());
if (method.isDefault()) {
InvocationHandler.invokeDefault(proxy, method, params);
}
throw new UnsupportedOperationException(method.toString());
};
}
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