rev 14210 : 8154231: Simplify access to System properties from JDK code
Reviewed-by: rriggs

   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 sun.security.action.GetPropertyAction;
  31 
  32 /**
  33  * Creates this platform's default FileSystemProvider.
  34  */
  35 
  36 public class DefaultFileSystemProvider {
  37     private DefaultFileSystemProvider() { }
  38 
  39     @SuppressWarnings("unchecked")
  40     private static FileSystemProvider createProvider(String cn) {
  41         Class<FileSystemProvider> c;
  42         try {
  43             c = (Class<FileSystemProvider>)Class.forName(cn);
  44         } catch (ClassNotFoundException x) {
  45             throw new AssertionError(x);
  46         }
  47         try {
  48             return c.newInstance();
  49         } catch (IllegalAccessException | InstantiationException x) {
  50             throw new AssertionError(x);
  51         }
  52     }
  53 
  54     /**
  55      * Returns the default FileSystemProvider.
  56      */
  57     public static FileSystemProvider create() {
  58         String osname = AccessController
  59             .doPrivileged(new GetPropertyAction("os.name"));
  60         if (osname.equals("SunOS"))
  61             return createProvider("sun.nio.fs.SolarisFileSystemProvider");
  62         if (osname.equals("Linux"))
  63             return createProvider("sun.nio.fs.LinuxFileSystemProvider");
  64         if (osname.contains("OS X"))
  65             return createProvider("sun.nio.fs.MacOSXFileSystemProvider");
  66         if (osname.equals("AIX"))
  67             return createProvider("sun.nio.fs.AixFileSystemProvider");
  68         throw new AssertionError("Platform not recognized");
  69     }
  70 }
--- EOF ---