1 /*
   2  * Copyright (c) 2008, 2011, 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     @Override
  63     public final void setAttribute(String attribute, Object value)
  64         throws IOException
  65     {
  66         ByteBuffer bb;
  67         if (value instanceof byte[]) {
  68             bb = ByteBuffer.wrap((byte[])value);
  69         } else {
  70             bb = (ByteBuffer)value;
  71         }
  72         write(attribute, bb);
  73     }
  74 
  75     @Override
  76     public final Map<String,Object> readAttributes(String[] attributes)
  77         throws IOException
  78     {
  79         // names of attributes to return
  80         List<String> names = new ArrayList<>();
  81         for (String name: attributes) {
  82             if (name.equals("*")) {
  83                 names = list();
  84                 break;
  85             } else {
  86                 if (name.length() == 0)
  87                     throw new IllegalArgumentException();
  88                 names.add(name);
  89             }
  90         }
  91 
  92         // read each value and return in map
  93         Map<String,Object> result = new HashMap<>();
  94         for (String name: names) {
  95             int size = size(name);
  96             byte[] buf = new byte[size];
  97             int n = read(name, ByteBuffer.wrap(buf));
  98             byte[] value = (n == size) ? buf : Arrays.copyOf(buf, n);
  99             result.put(name, value);
 100         }
 101         return result;
 102     }
 103 }