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
66
67 String ext = getExtension(fn.toString());
68 if (ext.isEmpty())
69 return null; // no extension
70
71 loadMimeTypes();
72 if (mimeTypeMap == null || mimeTypeMap.isEmpty())
73 return null;
74
75 // Case-sensitive search
76 String mimeType;
77 do {
78 mimeType = mimeTypeMap.get(ext);
79 if (mimeType == null)
80 ext = getExtension(ext);
81 } while (mimeType == null && !ext.isEmpty());
82
83 return mimeType;
84 }
85
86 // Get the extension of a file name.
87 private static String getExtension(String name) {
88 String ext = "";
89 if (name != null && !name.isEmpty()) {
90 int dot = name.indexOf('.');
91 if ((dot >= 0) && (dot < name.length() - 1)) {
92 ext = name.substring(dot + 1);
93 }
94 }
95 return ext;
96 }
97
98 /**
99 * Parse the mime types file, and store the type-extension mappings into
100 * mimeTypeMap. The mime types file is not loaded until the first probe
101 * to achieve the lazy initialization. It adopts double-checked locking
102 * optimization to reduce the locking overhead.
103 */
104 private void loadMimeTypes() {
105 if (!loaded) {
106 synchronized (this) {
107 if (!loaded) {
108 List<String> lines = AccessController.doPrivileged(
109 new PrivilegedAction<>() {
110 @Override
111 public List<String> run() {
112 try {
113 return Files.readAllLines(mimeTypesFile,
114 Charset.defaultCharset());
115 } catch (IOException ignore) {
116 return Collections.emptyList();
117 }
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1 /*
2 * Copyright (c) 2015, 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
66
67 String ext = getExtension(fn.toString());
68 if (ext.isEmpty())
69 return null; // no extension
70
71 loadMimeTypes();
72 if (mimeTypeMap == null || mimeTypeMap.isEmpty())
73 return null;
74
75 // Case-sensitive search
76 String mimeType;
77 do {
78 mimeType = mimeTypeMap.get(ext);
79 if (mimeType == null)
80 ext = getExtension(ext);
81 } while (mimeType == null && !ext.isEmpty());
82
83 return mimeType;
84 }
85
86 /**
87 * Parse the mime types file, and store the type-extension mappings into
88 * mimeTypeMap. The mime types file is not loaded until the first probe
89 * to achieve the lazy initialization. It adopts double-checked locking
90 * optimization to reduce the locking overhead.
91 */
92 private void loadMimeTypes() {
93 if (!loaded) {
94 synchronized (this) {
95 if (!loaded) {
96 List<String> lines = AccessController.doPrivileged(
97 new PrivilegedAction<>() {
98 @Override
99 public List<String> run() {
100 try {
101 return Files.readAllLines(mimeTypesFile,
102 Charset.defaultCharset());
103 } catch (IOException ignore) {
104 return Collections.emptyList();
105 }
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