1 /*

     2  * Copyright 2008-2009 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.fs;

    27 

    28 import java.nio.file.FileRef;

    29 import java.io.IOException;

    30 import java.security.AccessController;

    31 import java.security.PrivilegedAction;

    32 

    33 /**

    34  * File type detector that uses the GNOME I/O library or the deprecated

    35  * GNOME VFS to guess the MIME type of a file.

    36  */

    37 

    38 public class GnomeFileTypeDetector

    39     extends AbstractFileTypeDetector

    40 {

    41     private static final String GNOME_VFS_MIME_TYPE_UNKNOWN =

    42         "application/octet-stream";

    43 

    44     // true if GIO available

    45     private final boolean gioAvailable;

    46 

    47     // true if GNOME VFS available and GIO is not available

    48     private final boolean gnomeVfsAvailable;

    49 

    50     public GnomeFileTypeDetector() {

    51         gioAvailable = initializeGio();

    52         if (gioAvailable) {

    53             gnomeVfsAvailable = false;

    54         } else {

    55             gnomeVfsAvailable = initializeGnomeVfs();

    56         }

    57     }

    58 

    59     @Override

    60     public String implProbeContentType(FileRef obj) throws IOException {

    61         if (!gioAvailable && !gnomeVfsAvailable)

    62             return null;

    63         if (!(obj instanceof UnixPath))

    64             return null;

    65 

    66         UnixPath path = (UnixPath)obj;

    67         NativeBuffer buffer = NativeBuffers.asNativeBuffer(path.getByteArrayForSysCalls());

    68         try {

    69             if (gioAvailable) {

    70                 byte[] type = probeUsingGio(buffer.address());

    71                 return (type == null) ? null : new String(type);

    72             } else {

    73                 byte[] type = probeUsingGnomeVfs(buffer.address());

    74                 if (type == null)

    75                     return null;

    76                 String s = new String(type);

    77                 return s.equals(GNOME_VFS_MIME_TYPE_UNKNOWN) ? null : s;

    78             }

    79 

    80         } finally {

    81             buffer.release();

    82         }

    83 

    84     }

    85 

    86     // GIO

    87     private static native boolean initializeGio();

    88     private static native byte[] probeUsingGio(long pathAddress);

    89 

    90     // GNOME VFS

    91     private static native boolean initializeGnomeVfs();

    92     private static native byte[] probeUsingGnomeVfs(long pathAddress);

    93 

    94     static {

    95         AccessController.doPrivileged(new PrivilegedAction<Void>() {

    96             public Void run() {

    97                 System.loadLibrary("nio");

    98                 return null;

    99         }});

   100     }

   101 }