/*

 * Copyright (c) 2019, 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.misc;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodHandles.Lookup;

import java.lang.invoke.MethodType;

import java.nio.channels.FileChannel.MapMode;

import java.security.AccessController;

import java.security.PrivilegedExceptionAction;

/**

 * JDK-specific map modes implemented in java.base.

 */

public class ExtendedMapMode {

    static final MethodHandle MAP_MODE_CONSTRUCTOR;

    static {

        try {

            PrivilegedExceptionAction<Lookup> pae = () ->

                MethodHandles.privateLookupIn(MapMode.class, MethodHandles.lookup());

            @SuppressWarnings("removal")

            Lookup lookup = AccessController.doPrivileged(pae);

            var methodType = MethodType.methodType(void.class, String.class);

            MAP_MODE_CONSTRUCTOR = lookup.findConstructor(MapMode.class, methodType);

        } catch (Exception e) {

            throw new InternalError(e);

        }

    }

    public static final MapMode READ_ONLY_SYNC = newMapMode("READ_ONLY_SYNC");

    public static final MapMode READ_WRITE_SYNC = newMapMode("READ_WRITE_SYNC");

    private static MapMode newMapMode(String name) {

        try {

            return (MapMode) MAP_MODE_CONSTRUCTOR.invoke(name);

        } catch (Throwable e) {

            throw new InternalError(e);

        }

    }

    private ExtendedMapMode() { }

}