/*

 * Copyright (c) 2018, 2020, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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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 */

package jdk.internal.module;

import java.util.function.Function;

import java.lang.module.Configuration;

import java.lang.module.ModuleFinder;

import jdk.internal.misc.CDS;

/**

 * Used by ModuleBootstrap for archiving the configuration for the boot layer,

 * and the system module finder.

 */

class ArchivedModuleGraph {

    private static ArchivedModuleGraph archivedModuleGraph;

    private final boolean hasSplitPackages;

    private final boolean hasIncubatorModules;

    private final ModuleFinder finder;

    private final Configuration configuration;

    private final Function<String, ClassLoader> classLoaderFunction;

    private ArchivedModuleGraph(boolean hasSplitPackages,

                                boolean hasIncubatorModules,

                                ModuleFinder finder,

                                Configuration configuration,

                                Function<String, ClassLoader> classLoaderFunction) {

        this.hasSplitPackages = hasSplitPackages;

        this.hasIncubatorModules = hasIncubatorModules;

        this.finder = finder;

        this.configuration = configuration;

        this.classLoaderFunction = classLoaderFunction;

    }

    ModuleFinder finder() {

        return finder;

    }

    Configuration configuration() {

        return configuration;

    }

    Function<String, ClassLoader> classLoaderFunction() {

        return classLoaderFunction;

    }

    boolean hasSplitPackages() {

        return hasSplitPackages;

    }

    boolean hasIncubatorModules() {

        return hasIncubatorModules;

    }

    /**

     * Returns the ArchivedModuleGraph for the given initial module.

     */

    static ArchivedModuleGraph get(String mainModule) {

        ArchivedModuleGraph graph = archivedModuleGraph;

        // We only allow the unnamed module (default) case for now

        if (mainModule == null) {

            return graph;

        } else {

            return null;

        }

    }

    /**

     * Archive the module graph for the given initial module.

     */

    static void archive(boolean hasSplitPackages,

                        boolean hasIncubatorModules,

                        ModuleFinder finder,

                        Configuration configuration,

                        Function<String, ClassLoader> classLoaderFunction) {

        archivedModuleGraph = new ArchivedModuleGraph(hasSplitPackages,

                                                      hasIncubatorModules,

                                                      finder,

                                                      configuration,

                                                      classLoaderFunction);

    }

    static {

        CDS.initializeFromArchive(ArchivedModuleGraph.class);

    }

}