/*

 * Copyright (c) 2010, 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

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 */

package sun.net.sdp;

import java.io.IOException;

import java.io.FileDescriptor;

import java.security.AccessController;

import sun.misc.SharedSecrets;

import sun.misc.JavaIOFileDescriptorAccess;

/**

 * This class defines methods for creating SDP sockets or "converting" existing

 * file descriptors, referencing (unbound) TCP sockets, to SDP.

 */

public final class SdpSupport {

    private static final String os = AccessController

        .doPrivileged(new sun.security.action.GetPropertyAction("os.name"));

    private static final boolean isSupported = (os.equals("SunOS") || (os.equals("Linux")));

    private static final JavaIOFileDescriptorAccess fdAccess =

        SharedSecrets.getJavaIOFileDescriptorAccess();

    private SdpSupport() { }

    /**

     * Creates a SDP socket, returning file descriptor referencing the socket.

     */

    public static FileDescriptor createSocket() throws IOException {

        if (!isSupported)

            throw new UnsupportedOperationException("SDP not supported on this platform");

        int fdVal = create0();

        FileDescriptor fd = new FileDescriptor();

        fdAccess.set(fd, fdVal);

        return fd;

    }

    /**

     * Converts an existing file descriptor, that references an unbound TCP socket,

     * to SDP.

     */

    public static void convertSocket(FileDescriptor fd) throws IOException {

        if (!isSupported)

            throw new UnsupportedOperationException("SDP not supported on this platform");

        int fdVal = fdAccess.get(fd);

        convert0(fdVal);

    }

    private static native int create0() throws IOException;

    private static native void convert0(int fd) throws IOException;

    static {

        AccessController.doPrivileged(

            new java.security.PrivilegedAction<Void>() {

                public Void run() {

                    System.loadLibrary("net");

                    return null;

                }

            });

    }

}