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
26package sun.nio.fs;
27
28import java.nio.ByteBuffer;
29import java.nio.file.attribute.UserDefinedFileAttributeView;
30import java.io.IOException;
31import java.util.*;
32
33/**
34 * Base implementation of UserDefinedAttributeView
35 */
36
37abstract 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}
104