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.*;

    29 import java.io.IOException;

    30 import java.security.AccessController;

    31 import java.security.PrivilegedAction;

    32 

    33 /**

    34  * File type detector that does lookup of file extension using Windows Registry.

    35  */

    36 

    37 public class RegistryFileTypeDetector

    38     extends AbstractFileTypeDetector

    39 {

    40     public RegistryFileTypeDetector() {

    41         super();

    42     }

    43 

    44     @Override

    45     public String implProbeContentType(FileRef file) throws IOException {

    46         if (!(file instanceof Path))

    47             return null;

    48 

    49         // get file extension

    50         Path name = ((Path)file).getName();

    51         if (name == null)

    52             return null;

    53         String filename = name.toString();

    54         int dot = filename.lastIndexOf('.');

    55         if ((dot < 0) || (dot == (filename.length()-1)))

    56             return null;

    57 

    58         // query HKEY_CLASSES_ROOT\<ext>

    59         String key = filename.substring(dot);

    60         NativeBuffer keyBuffer = WindowsNativeDispatcher.asNativeBuffer(key);

    61         NativeBuffer nameBuffer = WindowsNativeDispatcher.asNativeBuffer("Content Type");

    62         try {

    63             return queryStringValue(keyBuffer.address(), nameBuffer.address());

    64         } finally {

    65             nameBuffer.release();

    66             keyBuffer.release();

    67         }

    68     }

    69 

    70     private static native String queryStringValue(long subKey, long name);

    71 

    72     static {

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

    74             @Override

    75             public Void run() {

    76                 // nio.dll has dependency on net.dll

    77                 System.loadLibrary("net");

    78                 System.loadLibrary("nio");

    79                 return null;

    80         }});

    81     }

    82 }