1 /*

     2  * Copyright 2000-2003 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

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

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

    23  * have any questions.

    24  */

    25 

    26 package sun.nio.ch;

    27 

    28 import java.io.*;

    29 

    30 

    31 /**

    32  * Allows different platforms to call different native methods

    33  * for read and write operations.

    34  */

    35 

    36 class FileDispatcher extends NativeDispatcher

    37 {

    38 

    39     static {

    40         Util.load();

    41     }

    42 

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

    44         throws IOException

    45     {

    46         return read0(fd, address, len);

    47     }

    48 

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

    50                              long position, Object lock) throws IOException

    51     {

    52         synchronized(lock) {

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

    54         }

    55     }

    56 

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

    58         return readv0(fd, address, len);

    59     }

    60 

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

    62         return write0(fd, address, len);

    63     }

    64 

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

    66                              long position, Object lock) throws IOException

    67     {

    68         synchronized(lock) {

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

    70         }

    71     }

    72 

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

    74         return writev0(fd, address, len);

    75     }

    76 

    77     void close(FileDescriptor fd) throws IOException {

    78         close0(fd);

    79     }

    80 

    81     //-- Native methods

    82 

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

    84         throws IOException;

    85 

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

    87                              long position) throws IOException;

    88 

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

    90         throws IOException;

    91 

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

    93         throws IOException;

    94 

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

    96                              long position) throws IOException;

    97 

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

    99         throws IOException;

   100 

   101     static native void close0(FileDescriptor fd) throws IOException;

   102 

   103     static native void closeByHandle(long fd) throws IOException;

   104 

   105 }