1 /*
2  * Copyright (c) 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.file.*;
29 import java.nio.file.spi.FileSystemProvider;
30 import java.io.IOException;
31 import java.util.Map;
32 
33 /**
34  * Base implementation class of FileSystemProvider
35  */
36 
37 abstract class AbstractFileSystemProvider extends FileSystemProvider {
AbstractFileSystemProvider()38     protected AbstractFileSystemProvider() { }
39 
40     /**
41      * Splits the given attribute name into the name of an attribute view and
42      * the attribute. If the attribute view is not identified then it assumed
43      * to be "basic".
44      */
split(String attribute)45     private static String[] split(String attribute) {
46         String[] s = new String[2];
47         int pos = attribute.indexOf(':');
48         if (pos == -1) {
49             s[0] = "basic";
50             s[1] = attribute;
51         } else {
52             s[0] = attribute.substring(0, pos++);
53             s[1] = (pos == attribute.length()) ? "" : attribute.substring(pos);
54         }
55         return s;
56     }
57 
58     /**
59      * Gets a DynamicFileAttributeView by name. Returns {@code null} if the
60      * view is not available.
61      */
getFileAttributeView(Path file, String name, LinkOption... options)62     abstract DynamicFileAttributeView getFileAttributeView(Path file,
63                                                            String name,
64                                                            LinkOption... options);
65 
66     @Override
setAttribute(Path file, String attribute, Object value, LinkOption... options)67     public final void setAttribute(Path file,
68                                    String attribute,
69                                    Object value,
70                                    LinkOption... options)
71         throws IOException
72     {
73         String[] s = split(attribute);
74         if (s[0].length() == 0)
75             throw new IllegalArgumentException(attribute);
76         DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
77         if (view == null)
78             throw new UnsupportedOperationException("View '" + s[0] + "' not available");
79         view.setAttribute(s[1], value);
80     }
81 
82     @Override
readAttributes(Path file, String attributes, LinkOption... options)83     public final Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
84         throws IOException
85     {
86         String[] s = split(attributes);
87         if (s[0].length() == 0)
88             throw new IllegalArgumentException(attributes);
89         DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
90         if (view == null)
91             throw new UnsupportedOperationException("View '" + s[0] + "' not available");
92         return view.readAttributes(s[1].split(","));
93     }
94 
95     /**
96      * Deletes a file. The {@code failIfNotExists} parameters determines if an
97      * {@code IOException} is thrown when the file does not exist.
98      */
implDelete(Path file, boolean failIfNotExists)99     abstract boolean implDelete(Path file, boolean failIfNotExists) throws IOException;
100 
101     @Override
delete(Path file)102     public final void delete(Path file) throws IOException {
103         implDelete(file, true);
104     }
105 
106     @Override
deleteIfExists(Path file)107     public final boolean deleteIfExists(Path file) throws IOException {
108         return implDelete(file, false);
109     }
110 }
111