J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 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.management; |
| 27 | |
| 28 | import java.io.File; |
| 29 | import java.io.IOException; |
| 30 | |
| 31 | /* |
| 32 | * Utility class to support file system operations |
| 33 | * |
| 34 | * @since 1.5 |
| 35 | */ |
| 36 | public abstract class FileSystem { |
| 37 | |
| 38 | private static final Object lock = new Object(); |
| 39 | private static FileSystem fs; |
| 40 | |
| 41 | protected FileSystem() { } |
| 42 | |
| 43 | /** |
| 44 | * Opens the file system |
| 45 | */ |
| 46 | public static FileSystem open() { |
| 47 | synchronized (lock) { |
| 48 | if (fs == null) { |
| 49 | fs = new FileSystemImpl(); |
| 50 | } |
| 51 | return fs; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Tells whether or not the specified file is located on a |
| 57 | * file system that supports file security or not. |
| 58 | * |
| 59 | * @throws IOException if an I/O error occurs. |
| 60 | */ |
| 61 | public abstract boolean supportsFileSecurity(File f) throws IOException; |
| 62 | |
| 63 | /** |
| 64 | * Tell whether or not the specified file is accessible |
| 65 | * by anything other than the file owner. |
| 66 | * |
| 67 | * @throws IOException if an I/O error occurs. |
| 68 | * |
| 69 | * @throws UnsupportedOperationException |
| 70 | * If file is located on a file system that doesn't support |
| 71 | * file security. |
| 72 | */ |
| 73 | public abstract boolean isAccessUserOnly(File f) throws IOException; |
| 74 | } |