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
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.file.Path;
29import 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
36class MimeTypesFileTypeDetector extends AbstractFileTypeDetector {
37
38    @Override
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.
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