/*

 * Copyright (c) 2015, 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.module;

import java.lang.module.ModuleDescriptor;

import java.util.Map;

import java.util.Set;

/**

 * A SystemModules object reconstitutes module descriptors and other modules

 * attributes in an efficient way to avoid parsing module-info.class files at

 * startup. Implementations of this class are generated by the "system modules"

 * jlink plugin.

 *

 * @see SystemModuleFinders

 * @see jdk.tools.jlink.internal.plugins.SystemModulesPlugin

 */

interface SystemModules {

    /**

     * Returns false if the module reconstituted by this SystemModules object

     * have no overlapping packages. Returns true if there are overlapping

     * packages or unknown.

     */

    boolean hasSplitPackages();

    /**

     * Return false if the modules reconstituted by this SystemModules object

     * do not include any incubator modules. Returns true if there are

     * incubating modules or unknown.

     */

    boolean hasIncubatorModules();

    /**

     * Returns the non-empty array of ModuleDescriptor objects.

     */

    ModuleDescriptor[] moduleDescriptors();

    /**

     * Returns the array of ModuleTarget objects. The array elements correspond

     * to the array of ModuleDescriptor objects.

     */

    ModuleTarget[] moduleTargets();

    /**

     * Returns the array of ModuleHashes objects. The array elements correspond

     * to the array of ModuleDescriptor objects.

     */

    ModuleHashes[] moduleHashes();

    /**

     * Returns the array of ModuleResolution objects. The array elements correspond

     * to the array of ModuleDescriptor objects.

     */

    ModuleResolution[] moduleResolutions();

    /**

     * Returns the map representing readability graph for the modules reconstituted

     * by this SystemModules object.

     */

    Map<String, Set<String>> moduleReads();

}