/*

 * Copyright 2000-2003 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.nio.ch;

import java.io.*;

/**

 * Allows different platforms to call different native methods

 * for read and write operations.

 */

class FileDispatcher extends NativeDispatcher

{

    static {

        Util.load();

    }

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

        throws IOException

    {

        return read0(fd, address, len);

    }

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

                             long position, Object lock) throws IOException

    {

        synchronized(lock) {

            return pread0(fd, address, len, position);

        }

    }

    long readv(FileDescriptor fd, long address, int len) throws IOException {

        return readv0(fd, address, len);

    }

    int write(FileDescriptor fd, long address, int len) throws IOException {

        return write0(fd, address, len);

    }

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

                             long position, Object lock) throws IOException

    {

        synchronized(lock) {

            return pwrite0(fd, address, len, position);

        }

    }

    long writev(FileDescriptor fd, long address, int len) throws IOException {

        return writev0(fd, address, len);

    }

    void close(FileDescriptor fd) throws IOException {

        close0(fd);

    }

    //-- Native methods

    static native int read0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int pread0(FileDescriptor fd, long address, int len,

                             long position) throws IOException;

    static native long readv0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int write0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int pwrite0(FileDescriptor fd, long address, int len,

                             long position) throws IOException;

    static native long writev0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native void close0(FileDescriptor fd) throws IOException;

    static native void closeByHandle(long fd) throws IOException;

}