/*
 * Copyright (c) 2016, 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.nashorn.internal.scripts;

import jdk.nashorn.api.scripting.JSObject;

Nashorn's StructureLoader and ScriptLoader instances load this class in the respective dynamic modules created. This class is never loaded by Nashorn's own class loader. The .class bytes of this class are loaded as resource by the NashornLoader class. This class exists in this package because nashorn structures and scripts modules use this package name for the only exported package from those modules. Note that this class may be dynamically generated at runtime. But, this java source is used for ease of reading. /**
 * Nashorn's StructureLoader and ScriptLoader instances load
 * this class in the respective dynamic modules created. This
 * class is never loaded by Nashorn's own class loader. The
 * .class bytes of this class are loaded as resource by the
 * {@link jdk.nashorn.internal.runtime.NashornLoader} class. This class
 * exists in this package because nashorn structures and scripts
 * modules use this package name for the only exported package
 * from those modules.
 *
 * Note that this class may be dynamically generated at runtime.
 * But, this java source is used for ease of reading.
 */
final class ModuleGraphManipulator {
    private ModuleGraphManipulator() {}

    private static final Module MY_MODULE;
    private static final String MY_PKG_NAME;

    static {
        final Class<?> myClass = ModuleGraphManipulator.class;
        MY_MODULE = myClass.getModule();
        final String myName = myClass.getName();
        MY_PKG_NAME = myName.substring(0, myName.lastIndexOf('.'));

        // nashorn's module is the module of the class loader of current class
        final Module nashornModule = myClass.getClassLoader().getClass().getModule();

        // Make sure this class was not loaded by Nashorn's own loader!
        if (MY_MODULE == nashornModule) {
            throw new IllegalStateException(myClass + " loaded by wrong loader!");
        }

        // open package to nashorn module
        MY_MODULE.addOpens(MY_PKG_NAME, nashornModule);
    }

    // The following method is reflectively invoked from Nashorn
    // to add required module export edges. Because this package
    // itself is qualified exported only to nashorn and this
    // method is private, unsafe calls are not possible.

    private static void addExport(final Module otherMod) {
        MY_MODULE.addExports(MY_PKG_NAME, otherMod);
    }
}