/*

 * Copyright (c) 2015, 2018, 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.

 *

 */

/**

 * Used with -p or --upgrade-module-path to exercise the replacement

 * of classes in modules that are linked into the runtime image.

 */

import java.lang.*;

import java.lang.reflect.*;

import sun.hotspot.WhiteBox;

public class LimitModsHelper {

    static final ClassLoader PLATFORM_LOADER = ClassLoader.getPlatformClassLoader();

    static final ClassLoader SYS_LOADER      = ClassLoader.getSystemClassLoader();

    public static void main(String[] args) throws Exception {

        assertTrue(args.length == 4);

        String[] classNames = new String[3];

        for (int i = 0; i < 3; i++) {

            classNames[i] = args[i].replace('/', '.');

        }

        int excludeModIdx = Integer.parseInt(args[3]);

        ClassLoader expectedLoaders[] = {null, PLATFORM_LOADER, SYS_LOADER};

        WhiteBox wb = WhiteBox.getWhiteBox();

        Class<?> clazz = null;

        for (int i = 0; i < 3; i++) {

            try {

                // Load the class with the default ClassLoader.

                clazz = Class.forName(classNames[i]);

            } catch (Exception e) {

                if (i == excludeModIdx) {

                    System.out.println(classNames[i] + " not found as expected because the module isn't in the --limit-modules - PASSED");

                } else {

                    throw(e);

                }

            }

            if (clazz != null && i != excludeModIdx) {

                // Make sure we got the expected defining ClassLoader

                testLoader(clazz, expectedLoaders[i]);

                // Make sure the class is not in the shared space

                // because CDS is disabled with --limit-modules during run time.

                if (excludeModIdx != -1) {

                    if (wb.isSharedClass(clazz)) {

                        throw new RuntimeException(clazz.getName() +

                            ".class should not be in the shared space. " +

                             "loader=" + clazz.getClassLoader() + " module=" + clazz.getModule().getName());

                    }

                } else {

                    // class should be in the shared space if --limit-modules

                    // isn't specified during run time

                    if (!wb.isSharedClass(clazz)) {

                        throw new RuntimeException(clazz.getName() +

                            ".class should be in the shared space. " +

                             "loader=" + clazz.getClassLoader() + " module=" + clazz.getModule().getName());

                    }

                }

            }

            clazz = null;

        }

    }

    /**

     * Asserts that given class has the expected defining loader.

     */

    static void testLoader(Class<?> clazz, ClassLoader expected) {

        ClassLoader loader = clazz.getClassLoader();

        if (loader != expected) {

            throw new RuntimeException(clazz + " loaded by " + loader + ", expected " + expected);

        }

    }

    static void assertTrue(boolean expr) {

        if (!expr)

            throw new RuntimeException("assertion failed");

    }

}