1 /*
2  * Copyright (c) 2012, 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
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23  * questions.
24  */
25 
26 package sun.nio.fs;
27 
28 import java.nio.file.Path;
29 import libcore.net.MimeUtils;
30 
31 /**
32  * File type detector that uses a file extension to look up its MIME type
33  * based on a mime.types file.
34  */
35 
36 class MimeTypesFileTypeDetector extends AbstractFileTypeDetector {
37 
38     @Override
implProbeContentType(Path path)39     protected String implProbeContentType(Path path) {
40         Path fn = path.getFileName();
41         if (fn == null)
42             return null;  // no file name
43 
44         String ext = getExtension(fn.toString());
45         if (ext.isEmpty())
46             return null;  // no extension
47 
48         // Case-sensitive search
49         String mimeType;
50         do {
51             mimeType = MimeUtils.guessMimeTypeFromExtension(ext);
52             if (mimeType == null)
53                 ext = getExtension(ext);
54         } while (mimeType == null && !ext.isEmpty());
55 
56         return mimeType;
57     }
58 
59     // Get the extension of a file name.
getExtension(String name)60     private static String getExtension(String name) {
61         String ext = "";
62         if (name != null && !name.isEmpty()) {
63             int dot = name.indexOf('.');
64             if ((dot >= 0) && (dot < name.length() - 1)) {
65                 ext = name.substring(dot + 1);
66             }
67         }
68         return ext;
69     }
70 }
71