1 /*
   2  * Copyright (c) 2008, 2012, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.nio.fs;
  27 
  28 import java.nio.file.spi.FileSystemProvider;
  29 import java.security.AccessController;
  30 import java.security.PrivilegedAction;
  31 import sun.security.action.GetPropertyAction;
  32 
  33 /**
  34  * Creates this platform's default FileSystemProvider.
  35  */
  36 
  37 public class DefaultFileSystemProvider {
  38     private DefaultFileSystemProvider() { }
  39 
  40     @SuppressWarnings("unchecked")
  41     private static FileSystemProvider createProvider(final String cn) {
  42         return AccessController
  43             .doPrivileged(new PrivilegedAction<FileSystemProvider>() {
  44                 public FileSystemProvider run() {
  45                     Class<FileSystemProvider> c;
  46                     try {
  47                         c = (Class<FileSystemProvider>)Class.forName(cn, true, null);
  48                     } catch (ClassNotFoundException x) {
  49                         throw new AssertionError(x);
  50                     }
  51                     try {
  52                         return c.newInstance();
  53                     } catch (IllegalAccessException x) {
  54                         throw new AssertionError(x);
  55                     } catch (InstantiationException x) {
  56                         throw new AssertionError(x);
  57                     }
  58             }});
  59     }
  60 
  61     /**
  62      * Returns the default FileSystemProvider.
  63      */
  64     public static FileSystemProvider create() {
  65         String osname = AccessController
  66             .doPrivileged(new GetPropertyAction("os.name"));
  67         if (osname.equals("SunOS"))
  68             return createProvider("sun.nio.fs.SolarisFileSystemProvider");
  69         if (osname.equals("Linux"))
  70             return createProvider("sun.nio.fs.LinuxFileSystemProvider");
  71         if (osname.equals("Darwin") || osname.contains("OS X"))
  72             return createProvider("sun.nio.fs.MacOSXFileSystemProvider");
  73         throw new AssertionError("Platform not recognized");
  74     }
  75 }