/*

 * Copyright (c) 2012, 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 sun.corba;

import java.lang.reflect.Field;

import java.security.AccessController;

import java.security.PrivilegedAction;

import com.sun.corba.se.impl.io.ValueUtility;

import sun.misc.Unsafe;

/** A repository of "shared secrets", which are a mechanism for

    calling implementation-private methods in another package without

    using reflection. A package-private class implements a public

    interface and provides the ability to call package-private methods

    within that package; the object implementing that interface is

    provided through a third package to which access is restricted.

    This framework avoids the primary disadvantage of using reflection

    for this purpose, namely the loss of compile-time checking. */

// SharedSecrets cloned in corba repo to avoid build issues

public class SharedSecrets {

    /** Access to Unsafe to read/write fields. */

    private static final Unsafe unsafe = AccessController.doPrivileged(

            (PrivilegedAction<Unsafe>)() -> {

                try {

                    Field field = Unsafe.class.getDeclaredField("theUnsafe");

                    field.setAccessible(true);

                    return (Unsafe)field.get(null);

                } catch (NoSuchFieldException |IllegalAccessException ex) {

                    throw new InternalError("Unsafe.theUnsafe field not available", ex);

                }

            }

    );

    private static JavaCorbaAccess javaCorbaAccess;

    public static JavaCorbaAccess getJavaCorbaAccess() {

        if (javaCorbaAccess == null) {

            // Ensure ValueUtility is initialized; we know that that class

            // provides the shared secret

            unsafe.ensureClassInitialized(ValueUtility.class);

        }

        return javaCorbaAccess;

    }

    public static void setJavaCorbaAccess(JavaCorbaAccess access) {

        javaCorbaAccess = access;

    }

}