/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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;
    }

}