1/* 2 * Copyright (c) 2004, 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 26package jdk.internal.agent; 27 28import java.io.File; 29import java.io.IOException; 30 31/* 32 * Utility class to support file system operations 33 * 34 * @since 1.5 35 */ 36public 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} 75