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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chrome.browser.photo_picker; | |
6 | |
7 import android.support.annotation.NonNull; | |
8 import android.webkit.MimeTypeMap; | |
9 | |
10 import java.io.File; | |
11 import java.io.FileFilter; | |
12 import java.util.HashSet; | |
13 import java.util.Locale; | |
14 | |
15 /** | |
16 * A file filter for handling extensions and MIME types (images/jpeg) and | |
Theresa
2017/04/11 17:01:28
nit: This description should be updated since it c
Finnur
2017/04/12 11:04:43
Correct. Done.
| |
17 * supertypes (images/*). | |
18 */ | |
19 class MimeTypeFileFilter implements FileFilter { | |
20 private HashSet<String> mExtensions = new HashSet<>(); | |
21 private HashSet<String> mMimeTypes = new HashSet<>(); | |
22 private HashSet<String> mMimeSupertypes = new HashSet<>(); | |
23 private MimeTypeMap mMimeTypeMap; | |
24 | |
25 public MimeTypeFileFilter(@NonNull String acceptAttr) { | |
Theresa
2017/04/11 17:01:28
JavaDoc
Finnur
2017/04/12 11:04:42
Done.
| |
26 for (String field : acceptAttr.toLowerCase(Locale.US).split(",")) { | |
27 field = field.trim(); | |
28 if (field.startsWith(".")) { | |
29 mExtensions.add(field.substring(1)); | |
30 } else if (field.endsWith("/*")) { | |
31 mMimeSupertypes.add(field.substring(0, field.length() - 2)); | |
32 } else if (field.contains("/")) { | |
33 mMimeTypes.add(field); | |
34 } else { | |
35 // Throw exception? | |
36 } | |
37 } | |
38 | |
39 mMimeTypeMap = MimeTypeMap.getSingleton(); | |
40 } | |
41 | |
42 @Override | |
43 public boolean accept(@NonNull File file) { | |
44 if (file.isDirectory()) { | |
45 return true; | |
46 } | |
47 | |
48 String uri = file.toURI().toString(); | |
49 String ext = MimeTypeMap.getFileExtensionFromUrl(uri).toLowerCase(Locale .US); | |
50 if (mExtensions.contains(ext)) { | |
51 return true; | |
52 } | |
53 | |
54 String mimeType = getMimeTypeFromExtension(ext); | |
55 if (mimeType != null) { | |
56 if (mMimeTypes.contains(mimeType) | |
57 || mMimeSupertypes.contains(getMimeSupertype(mimeType))) { | |
58 return true; | |
59 } | |
60 } | |
61 | |
62 return false; | |
63 } | |
64 | |
65 private HashSet<String> getAcceptedSupertypes() { | |
66 HashSet<String> supertypes = new HashSet<>(); | |
67 supertypes.addAll(mMimeSupertypes); | |
68 for (String mimeType : mMimeTypes) { | |
69 supertypes.add(getMimeSupertype(mimeType)); | |
70 } | |
71 for (String ext : mExtensions) { | |
72 String mimeType = getMimeTypeFromExtension(ext); | |
73 if (mimeType != null) { | |
74 supertypes.add(getMimeSupertype(mimeType)); | |
75 } | |
76 } | |
77 return supertypes; | |
78 } | |
79 | |
80 private String getMimeTypeFromExtension(@NonNull String ext) { | |
81 String mimeType = mMimeTypeMap.getMimeTypeFromExtension(ext); | |
82 return (mimeType != null) ? mimeType.toLowerCase(Locale.US) : null; | |
83 } | |
84 | |
85 @NonNull | |
86 private String getMimeSupertype(@NonNull String mimeType) { | |
87 return mimeType.split("/", 2)[0]; | |
88 } | |
89 } | |
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