/*

 * Copyright (c) 2020, 2021, 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.loader;

import java.util.Map;

import jdk.internal.misc.CDS;

import jdk.internal.module.ServicesCatalog;

/**

 * Used to archive the built-in class loaders, their services catalogs, and the

 * package-to-module map used by the built-in class loaders.

 */

class ArchivedClassLoaders {

    private static ArchivedClassLoaders archivedClassLoaders;

    private final ClassLoader bootLoader;

    private final ClassLoader platformLoader;

    private final ClassLoader appLoader;

    private final ServicesCatalog[] servicesCatalogs;

    private final Map<String, ?> packageToModule;

    private ArchivedClassLoaders() {

        bootLoader = ClassLoaders.bootLoader();

        platformLoader = ClassLoaders.platformClassLoader();

        appLoader = ClassLoaders.appClassLoader();

        servicesCatalogs = new ServicesCatalog[3];

        servicesCatalogs[0] = ServicesCatalog.getServicesCatalog(bootLoader);

        servicesCatalogs[1] = ServicesCatalog.getServicesCatalog(platformLoader);

        servicesCatalogs[2] = ServicesCatalog.getServicesCatalog(appLoader);

        packageToModule = BuiltinClassLoader.packageToModule();

    }

    ClassLoader bootLoader() {

        return bootLoader;

    }

    ClassLoader platformLoader() {

        return platformLoader;

    }

    ClassLoader appLoader() {

        return appLoader;

    }

    ServicesCatalog servicesCatalog(ClassLoader loader) {

        if (loader == bootLoader) {

            return servicesCatalogs[0];

        } else if (loader == platformLoader) {

            return servicesCatalogs[1];

        } else if (loader == appLoader) {

            return servicesCatalogs[2];

        } else {

            throw new InternalError();

        }

    }

    Map<String, ?> packageToModule() {

        return packageToModule;

    }

    static void archive() {

        archivedClassLoaders = new ArchivedClassLoaders();

    }

    static ArchivedClassLoaders get() {

        return archivedClassLoaders;

    }

    static {

        CDS.initializeFromArchive(ArchivedClassLoaders.class);

    }

}