75 lines
2.8 KiB
Java
75 lines
2.8 KiB
Java
/*
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* Copyright (c) 2017, 2023, 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 8020801
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* @summary Restriction on reflective call to MethodHandles.lookup method
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* @run main java.base/java.lang.LookupTest
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* @run main ReflectiveLookupTest
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*/
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import java.lang.invoke.*;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.reflect.Method;
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import static java.lang.invoke.MethodType.*;
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/*
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* Lookup object can be obtained statically or reflectively.
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*/
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public class ReflectiveLookupTest {
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public static void main(String... args) throws Throwable {
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// Get a full power lookup
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Lookup lookup1 = MethodHandles.lookup();
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MethodHandle mh1 = lookup1.findStatic(lookup1.lookupClass(),
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"foo",
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methodType(String.class));
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assertEquals((String) mh1.invokeExact(), foo());
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Method lookupMethod = MethodHandles.class.getMethod("lookup");
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System.out.println("reflection method: " + lookupMethod);
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assertEquals(lookupMethod.getName(), "lookup");
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// Get a full power Lookup reflectively.
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Lookup lookup2 = (Lookup) lookupMethod.invoke(null);
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assertEquals(lookup1.lookupClass(), lookup2.lookupClass());
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assertEquals(lookup1.lookupModes(), lookup2.lookupModes());
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MethodHandle mh2 = lookup2.findStatic(lookup2.lookupClass(),
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"foo",
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methodType(String.class));
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assertEquals((String) mh2.invokeExact(), foo());
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}
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static String foo() {
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return "foo!";
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}
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static void assertEquals(Object o1, Object o2) {
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if (!o1.equals(o2)) {
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throw new RuntimeException(o1 + " != " + o2);
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}
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}
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}
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