/*

 * Copyright (c) 2015, 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.ResolvedModule;

import java.lang.reflect.Layer;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

/**

 * Basic test of ClassLoader getResource and getResourceAsStream when

 * invoked from code in named modules.

 */

public class Main {

    static final String NAME = "myresource";

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

        // create m1/myresource containing "m1"

        Path file = directoryFor("m1").resolve(NAME);

        Files.write(file, "m1".getBytes("UTF-8"));

        // create m2/myresource containing "m2"

        file = directoryFor("m2").resolve(NAME);

        Files.write(file, "m2".getBytes("UTF-8"));

        // check that m3/myresource does not exist

        assertTrue(Files.notExists(directoryFor("m3").resolve(NAME)));

        // invoke ClassLoader getResource from the unnamed module

        assertNull(Main.class.getClassLoader().getResource("/" + NAME));

        // invoke ClassLoader getResource from modules m1-m3

        // Resources in a named module are private to that module.

        // ClassLoader.getResource should not find resource in named modules.

        assertNull(p1.Main.getResourceInClassLoader("/" + NAME));

        assertNull(p2.Main.getResourceInClassLoader("/" + NAME));

        assertNull(p3.Main.getResourceInClassLoader("/" + NAME));

        // invoke ClassLoader getResourceAsStream from the unnamed module

        assertNull(Main.class.getClassLoader().getResourceAsStream("/" + NAME));

        // invoke ClassLoader getResourceAsStream from modules m1-m3

        // Resources in a named module are private to that module.

        // ClassLoader.getResourceAsStream should not find resource in named modules.

        assertNull(p1.Main.getResourceAsStreamInClassLoader("/" + NAME));

        assertNull(p2.Main.getResourceAsStreamInClassLoader("/" + NAME));

        assertNull(p3.Main.getResourceAsStreamInClassLoader("/" + NAME));

        // SecurityManager case

        System.setSecurityManager(new SecurityManager());

        assertNull(Main.class.getClassLoader().getResource("/" + NAME));

        assertNull(p1.Main.getResourceInClassLoader("/" + NAME));

        assertNull(p2.Main.getResourceInClassLoader("/" + NAME));

        assertNull(p3.Main.getResourceInClassLoader("/" + NAME));

        assertNull(Main.class.getClassLoader().getResourceAsStream("/" + NAME));

        assertNull(p1.Main.getResourceAsStreamInClassLoader("/" + NAME));

        assertNull(p2.Main.getResourceAsStreamInClassLoader("/" + NAME));

        assertNull(p3.Main.getResourceAsStreamInClassLoader("/" + NAME));

        System.out.println("Success!");

    }

    /**

     * Returns the directory for the given module (by name).

     */

    static Path directoryFor(String mn) {

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

        ResolvedModule resolvedModule = cf.findModule(mn).orElse(null);

        if (resolvedModule == null)

            throw new RuntimeException("not found: " + mn);

        Path dir = Paths.get(resolvedModule.reference().location().get());

        if (!Files.isDirectory(dir))

            throw new RuntimeException("not a directory: " + dir);

        return dir;

    }

    static void assertTrue(boolean condition) {

        if (!condition) throw new RuntimeException();

    }

    static void assertNull(Object o) {

        assertTrue(o == null);

    }

}