/*

 * Copyright (c) 2017, 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.io.IOException;

import java.io.InputStream;

import java.lang.module.ModuleReader;

import java.lang.module.ModuleReference;

import java.lang.module.ResolvedModule;

import java.lang.reflect.Layer;

import java.net.URL;

import java.util.Enumeration;

/**

 * Usage: Main $MODULE

 *

 * Finds $MODULE in the boot layer and then tests that it can locate every

 * resource in the module content (JAR file).

 */

public class Main {

    static void testFind(String name) throws Exception {

        // getResource

        URL url = Main.class.getClassLoader().getResource(name);

        if (url == null)

            throw new RuntimeException("Unable to locate: " + name);

        System.out.println(name + " => " + url);

        // getResources

        Enumeration<URL> urls = Main.class.getClassLoader().getResources(name);

        if (!urls.hasMoreElements())

            throw new RuntimeException("Unable to locate: " + name);

        URL first = urls.nextElement();

        if (!first.toURI().equals(url.toURI()))

            throw new RuntimeException("found " + first + " ???");

        // getResourceAsStream

        if (!url.toString().endsWith("/")) {

            InputStream in = Main.class.getClassLoader().getResourceAsStream(name);

            if (in == null)

                throw new RuntimeException("Unable to locate: " + name);

            in.close();

        }

    }

    static void testFindUnchecked(String name) {

        try {

            testFind(name);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

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

        String mn = args[0];

        ModuleReference mref = Layer.boot()

                .configuration()

                .findModule(mn)

                .map(ResolvedModule::reference)

                .orElseThrow(() -> new RuntimeException(mn + " not resolved!!"));

        try (ModuleReader reader = mref.open()) {

            reader.list().forEach(name -> {

                testFindUnchecked(name);

                // if the resource is a directory then find without trailing slash

                if (name.endsWith("/")) {

                    testFindUnchecked(name.substring(0, name.length() - 1));

                }

            });

        }

    }

}