/*

 * 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.net;

import java.net.InetAddress;

import java.io.FileDescriptor;

import java.io.IOException;

import java.security.AccessController;

import java.security.PrivilegedAction;

import sun.security.action.GetPropertyAction;

/**

 * Defines static methods to be invoked prior to binding or connecting TCP sockets.

 */

public final class NetHooks {

    /**

     * A provider with hooks to allow sockets be converted prior to binding or

     * connecting a TCP socket.

     *

     * <p> Concrete implementations of this class should define a zero-argument

     * constructor and implement the abstract methods specified below.

     */

    public static abstract class Provider {

        /**

         * Initializes a new instance of this class.

         */

        protected Provider() {}

        /**

         * Invoked prior to binding a TCP socket.

         */

        public abstract void implBeforeTcpBind(FileDescriptor fdObj,

                                               InetAddress address,

                                               int port)

            throws IOException;

        /**

         * Invoked prior to connecting an unbound TCP socket.

         */

        public abstract void implBeforeTcpConnect(FileDescriptor fdObj,

                                                 InetAddress address,

                                                 int port)

            throws IOException;

    }

    /**

     * For now, we load the SDP provider on Solaris. In the future this may

     * be changed to use the ServiceLoader facility to allow the deployment of

     * other providers.

     */

    private static final Provider provider = new sun.net.sdp.SdpProvider();

    /**

     * Invoke prior to binding a TCP socket.

     */

    public static void beforeTcpBind(FileDescriptor fdObj,

                                     InetAddress address,

                                     int port)

        throws IOException

    {

        provider.implBeforeTcpBind(fdObj, address, port);

    }

    /**

     * Invoke prior to connecting an unbound TCP socket.

     */

    public static void beforeTcpConnect(FileDescriptor fdObj,

                                        InetAddress address,

                                        int port)

        throws IOException

    {

        provider.implBeforeTcpConnect(fdObj, address, port);

    }

}