/*

 * Copyright (c) 2014, 2015, 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

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 * questions.

 */

/*

 * @test

 * @run testng VarHandleTestReflection

 */

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandleInfo;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.VarHandle;

import java.lang.reflect.Method;

import java.util.stream.Stream;

public class VarHandleTestReflection extends VarHandleBaseTest {

    String string;

    @DataProvider

    public static Object[][] accessModesProvider() {

        return Stream.of(VarHandle.AccessMode.values()).

                map(am -> new Object[]{am}).

                toArray(Object[][]::new);

    }

    static VarHandle handle() throws Exception {

        return MethodHandles.lookup().

                findVarHandle(VarHandleTestReflection.class, "string", String.class);

    }

    @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)

    public void methodInvocation(VarHandle.AccessMode accessMode) throws Exception {

        VarHandle v = handle();

        // Try a reflective invoke using a Method

        Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);

        vhm.invoke(v, new Object[]{});

    }

    @Test(dataProvider = "accessModesProvider", expectedExceptions = UnsupportedOperationException.class)

    public void methodHandleInvoke(VarHandle.AccessMode accessMode) throws Throwable {

        VarHandle v = handle();

        // Try a reflective invoke using a MethodHandle

        MethodHandle mh = MethodHandles.lookup().unreflect(

                VarHandle.class.getMethod(accessMode.methodName(), Object[].class));

        // Use invoke to avoid WrongMethodTypeException for

        // non-signature-polymorphic return types

        Object o = (Object) mh.invoke(v, new Object[]{});

    }

    @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)

    public void methodInvocationFromMethodInfo(VarHandle.AccessMode accessMode) throws Exception {

        VarHandle v = handle();

        // Try a reflective invoke using a Method obtained from cracking

        // a MethodHandle

        MethodHandle mh = MethodHandles.lookup().unreflect(

                VarHandle.class.getMethod(accessMode.methodName(), Object[].class));

        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);

        Method im = info.reflectAs(Method.class, MethodHandles.lookup());

        im.invoke(v, new Object[]{});

    }

    @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)

    public void reflectAsFromVarHandleInvoker(VarHandle.AccessMode accessMode) throws Exception {

        VarHandle v = handle();

        MethodHandle mh = MethodHandles.varHandleInvoker(

                accessMode, v.accessModeType(accessMode));

        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);

        info.reflectAs(Method.class, MethodHandles.lookup());

    }

    @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)

    public void reflectAsFromFindVirtual(VarHandle.AccessMode accessMode) throws Exception {

        VarHandle v = handle();

        MethodHandle mh = MethodHandles.publicLookup().findVirtual(

                VarHandle.class, accessMode.methodName(), v.accessModeType(accessMode));

        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);

        info.reflectAs(Method.class, MethodHandles.lookup());

    }

}