/*

 * Copyright (c) 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.lang.module.Configuration;

import java.lang.module.ModuleFinder;

import java.lang.reflect.Layer;

import java.lang.reflect.Method;

import java.lang.reflect.Module;

import java.net.URL;

import java.net.URLClassLoader;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Set;

public class TestLayer {

    private static final Path MODS_DIR = Paths.get("mods");

    private static final Set<String> modules = Set.of("m1", "m2");

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

        // disable security manager until Class.forName is called.

        SecurityManager sm = System.getSecurityManager();

        if (sm != null) {

            System.setSecurityManager(null);

        }

        ModuleFinder finder = ModuleFinder.of(MODS_DIR);

        Configuration parent = Layer.boot().configuration();

        ClassLoader scl = ClassLoader.getSystemClassLoader();

        Layer layer = Layer.boot().defineModulesWithManyLoaders(cf, scl);

        Module m1 = layer.findModule("m1").get();

        Module m2 = layer.findModule("m2").get();

        if (sm != null) {

            System.setSecurityManager(sm);

        }

        // find exported and non-exported class from a named module

        findClass(m1, "p1.A");

        findClass(m1, "p1.internal.B");

        findClass(m2, "p2.C");

        // find class from unnamed module

        ClassLoader ld = TestLayer.class.getClassLoader();

        findClass(ld.getUnnamedModule(), "TestDriver");

        // check if clinit should not be initialized

        // compile without module-path; so use reflection

        Class<?> c = Class.forName(m1, "p1.Initializer");

        Method m = c.getMethod("isInited");

        Boolean isClinited = (Boolean) m.invoke(null);

        if (isClinited.booleanValue()) {

           throw new RuntimeException("clinit should not be invoked");

        }

    }

    static Class<?> findClass(Module module, String cn) {

        Class<?> c = Class.forName(module, cn);

        if (c == null) {

            throw new RuntimeException(cn + " not found in " + module);

        }

        if (c.getModule() != module) {

            throw new RuntimeException(c.getModule() + " != " + module);

        }

        return c;

    }

}