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
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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 {
AbstractUserDefinedFileAttributeView()40     protected AbstractUserDefinedFileAttributeView() { }
41 
checkAccess(String file, boolean checkRead, boolean checkWrite)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
name()58     public final String name() {
59         return "user";
60     }
61 
62     @Override
setAttribute(String attribute, Object value)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
readAttributes(String[] attributes)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.isEmpty())
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 }
104