/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package sun.nio.ch;

import java.io.*;

/**

 * Allows different platforms to call different native methods

 * for read and write operations.

 */

abstract class NativeDispatcher

{

    abstract int read(FileDescriptor fd, long address, int len)

        throws IOException;

    int pread(FileDescriptor fd, long address, int len,

                             long position, Object lock) throws IOException

    {

        throw new IOException("Operation Unsupported");

    }

    abstract long readv(FileDescriptor fd, long address, int len)

        throws IOException;

    abstract int write(FileDescriptor fd, long address, int len)

        throws IOException;

    int pwrite(FileDescriptor fd, long address, int len,

                             long position, Object lock) throws IOException

    {

        throw new IOException("Operation Unsupported");

    }

    abstract long writev(FileDescriptor fd, long address, int len)

        throws IOException;

    abstract void close(FileDescriptor fd) throws IOException;

    // Prepare the given fd for closing by duping it to a known internal fd

    // that's already closed.  This is necessary on some operating systems

    // (Solaris and Linux) to prevent fd recycling.

    //

    void preClose(FileDescriptor fd) throws IOException {

        // Do nothing by default; this is only needed on Unix

    }

}