/*

 * Copyright (c) 2014, 2016, 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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 */

/*

 * @test

 * @summary Exercise Class#getModule

 * @modules java.base/jdk.internal.org.objectweb.asm

 *          java.base/jdk.internal.misc

 *          java.desktop

 * @run testng GetModuleTest

 */

import java.awt.Component;

import java.lang.reflect.Field;

import java.lang.reflect.Module;

import jdk.internal.org.objectweb.asm.ClassWriter;

import static jdk.internal.org.objectweb.asm.Opcodes.*;

import jdk.internal.misc.Unsafe;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import static org.testng.Assert.*;

public class GetModuleTest {

    static final Unsafe U;

    static {

        try {

            Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");

            theUnsafe.setAccessible(true);

            U = (Unsafe) theUnsafe.get(null);

        } catch (Exception e) {

            throw new AssertionError(e);

        }

    }

    private static final Module TEST_MODULE = GetModuleTest.class.getModule();

    @DataProvider(name = "testclasses")

    public Object[][] testClasses() {

        return new Object[][] {

            // unnamed module

            { GetModuleTest.class,      null },

            { GetModuleTest[].class,    null },

            { GetModuleTest[][].class,  null },

            // should return named module

            { int.class,            "java.base" },

            { int[].class,          "java.base" },

            { int[][].class,        "java.base" },

            { void.class,           "java.base" },

            { Object.class,         "java.base" },

            { Object[].class,       "java.base" },

            { Object[][].class,     "java.base" },

            { Component.class,      "java.desktop" },

            { Component[].class,    "java.desktop" },

            { Component[][].class,  "java.desktop" },

        };

    }

    @Test(dataProvider = "testclasses")

    public void testGetModule(Class<?> type, String expected) {

        Module m = type.getModule();

        assertNotNull(m);

        if (expected == null) {

            assertTrue(m == TEST_MODULE);

        } else {

            assertEquals(m.getName(), expected);

        }

    }

    @DataProvider(name = "hostclasses")

    public Object[][] hostClasses() {

        return new Object[][] {

            { GetModuleTest.class,      null },

            { Object.class,             null },

            { Component.class,          null },

        };

    }

    /**

     * Exercise Class::getModule on VM anonymous classes

     */

    @Test(dataProvider = "hostclasses")

    public void testGetModuleOnVMAnonymousClass(Class<?> hostClass, String ignore) {

        // choose a class name in the same package as the host class

        String prefix = hostClass.getPackageName();

        if (prefix.length() > 0)

            prefix = prefix.replace('.', '/') + "/";

        String className = prefix + "Anon";

        // create the class

        String superName = "java/lang/Object";

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS

                                         + ClassWriter.COMPUTE_FRAMES);

        cw.visit(V1_8, ACC_PUBLIC + ACC_FINAL + ACC_SUPER,

                 className, null, superName, null);

        byte[] classBytes = cw.toByteArray();

        int cpPoolSize = constantPoolSize(classBytes);

        Class<?> anonClass

            = U.defineAnonymousClass(hostClass, classBytes, new Object[cpPoolSize]);

        assertTrue(anonClass.getModule() == hostClass.getModule());

    }

    private static int constantPoolSize(byte[] classFile) {

        return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);

    }

}