/*

 * Copyright (c) 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

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import java.net.URI;

import java.nio.file.DirectoryStream;

import java.nio.file.Files;

import java.nio.file.FileSystem;

import java.nio.file.FileSystems;

import java.nio.file.Path;

import java.util.ArrayList;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import jdk.test.lib.cds.CDSTestUtils;

import jdk.test.lib.cds.CDSOptions;

import jdk.test.lib.process.OutputAnalyzer;

/*

 * @test

 * @summary Try to archive lots of classes by searching for classes from the jrt:/ file system. With JDK 12

 *          this will produce an archive with over 30,000 classes.

 * @requires vm.cds

 * @library /test/lib

 * @run driver/timeout=500 LotsOfClasses

 */

public class LotsOfClasses {

    static Pattern pattern;

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

        ArrayList<String> list = new ArrayList<>();

        findAllClasses(list);

        CDSOptions opts = new CDSOptions();

        opts.setClassList(list);

        opts.addSuffix("--add-modules");

        opts.addSuffix("ALL-SYSTEM");

        opts.addSuffix("-Xlog:hashtables");

        OutputAnalyzer out = CDSTestUtils.createArchive(opts);

    }

    static void findAllClasses(ArrayList<String> list) throws Throwable {

        // Find all the classes in the jrt file system

        pattern = Pattern.compile("/modules/[a-z.]*[a-z]+/([^-]*)[.]class");

        FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));

        Path base = fs.getPath("/modules/");

        find(base, list);

    }

    static void find(Path p, ArrayList<String> list) throws Throwable {

        try (DirectoryStream<Path> stream = Files.newDirectoryStream(p)) {

                for (Path entry: stream) {

                    Matcher matcher = pattern.matcher(entry.toString());

                    if (matcher.find()) {

                        String className = matcher.group(1);

                        list.add(className);

                        //System.out.println(className);

                    }

                    try {

                        find(entry, list);

                    } catch (Throwable t) {}

                }

            }

    }

}