1 /* 2 * Copyright (c) 2008, 2009, 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.ByteBuffer; 29 import java.nio.file.attribute.UserDefinedFileAttributeView; 30 import java.io.IOException; 31 import java.util.*; 32 33 /** 34 * Base implementation of UserDefinedAttributeView 35 */ 36 37 abstract class AbstractUserDefinedFileAttributeView 38 implements UserDefinedFileAttributeView, DynamicFileAttributeView 39 { 40 protected AbstractUserDefinedFileAttributeView() { } 41 42 protected void checkAccess(String file, 43 boolean checkRead, 44 boolean checkWrite) 45 { 46 assert checkRead || checkWrite; 47 SecurityManager sm = System.getSecurityManager(); 48 if (sm != null) { 49 if (checkRead) 50 sm.checkRead(file); 51 if (checkWrite) 52 sm.checkWrite(file); 53 sm.checkPermission(new RuntimePermission("accessUserDefinedAttributes")); 54 } 55 } 56 57 @Override 58 public final String name() { 59 return "user"; 60 } 61 62 private Object getAttribute(String attribute) throws IOException { 63 int size; 64 try { 65 size = size(attribute); 66 } catch (IOException e) { 67 // not found or some other I/O error 68 if (list().contains(attribute)) 69 throw e; 70 return null; 71 } 72 73 byte[] buf = new byte[size]; 74 int n = read(attribute, ByteBuffer.wrap(buf)); 75 return (n == size) ? buf : Arrays.copyOf(buf, n); 76 } 77 78 @Override 79 public final void setAttribute(String attribute, Object value) 80 throws IOException 81 { 82 ByteBuffer bb; 83 if (value instanceof byte[]) { 84 bb = ByteBuffer.wrap((byte[])value); 85 } else { 86 bb = (ByteBuffer)value; 87 } 88 write(attribute, bb); 89 } 90 91 @Override 92 public final Map<String,Object> readAttributes(String[] attributes) 93 throws IOException 94 { 95 // names of attributes to return 96 List<String> names = new ArrayList<>(); 97 98 for (String name: attributes) { 99 if (name.equals("*")) { 100 names = list(); 101 break; 102 } else { 103 names.add(name); 104 } 105 } 106 107 // read each value and return in map 108 Map<String,Object> result = new HashMap<>(); 109 for (String name: names) { 110 Object value = getAttribute(name); 111 if (value != null) 112 result.put(name, value); 113 } 114 115 return result; 116 } 117 }