1 package org.apache.turbine.services.localization;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Turbine" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Turbine", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.util.Locale;
58 import java.util.StringTokenizer;
59 import org.apache.turbine.services.resources.TurbineResources;
60 import org.apache.turbine.util.RunData;
61
62 /***
63 * This class returns a Locale object based on the HTTP
64 * Accept-Language header.
65 *
66 * This class is based on examples from Jason Hunter's book <i>Java
67 * Servlet Programming</i>.
68 *
69 * @author <a href="mailto:frank.kim@clearink.com">Frank Y. Kim</a>
70 * @author <a href="mailto:jon@collab.net">Jon S. Stevens</a>
71 * @deprecated Use LocaleTokenizer instead.
72 */
73 public class LocaleDetector
74 {
75 /***
76 * Attempts to pull the "Accept-Language" header out of the
77 * HttpServletRequest object and then parse it. If the header is
78 * not present, it will return a null Locale.
79 *
80 * @param data Turbine information.
81 * @return A Locale.
82 */
83 public static Locale getLocale(RunData data)
84 {
85 String header = data.getRequest().getHeader("Accept-Language");
86 if ( header == null || header.length() == 0 )
87 return null;
88 return getLocale( header );
89 }
90
91 /***
92 * This method parses the Accept-Language header and attempts to
93 * create a Locale out of it.
94 *
95 * @param languageHeader A String with the language header.
96 * @return A Locale.
97 */
98 public static Locale getLocale(String languageHeader)
99 {
100 Locale locale = null;
101
102 // return a "default" locale
103 if ( languageHeader == null ||
104 languageHeader.trim().equals("") )
105 {
106 return new Locale(
107 TurbineResources.getString("locale.default.language", "en"),
108 TurbineResources.getString("locale.default.country", "US"));
109 }
110
111 // The HTTP Accept-Header is something like
112 //
113 // "en, es;q=0.8, zh-TW;q=0.1"
114 StringTokenizer tokenizer = new StringTokenizer(languageHeader, ",");
115
116 // while ( tokenizer.hasMoreTokens() )
117 // {
118 String language = tokenizer.nextToken();
119 // This should never be true but just in case
120 // if ( !language.trim().equals("") )
121 return getLocaleForLanguage(language.trim());
122 // }
123 }
124
125 /***
126 * This method creates a Locale from the language.
127 *
128 * @param language A String with the language.
129 * @return A Locale.
130 */
131 private static Locale getLocaleForLanguage(String language)
132 {
133 Locale locale;
134 int semi, dash;
135
136 // Cut off any q-value that comes after a semicolon.
137 if ( (semi=language.indexOf(';')) != -1 )
138 {
139 language = language.substring(0, semi);
140 }
141
142 language = language.trim();
143
144 // Create a Locale from the language. A dash may separate the
145 // language from the country.
146 if ( (dash=language.indexOf('-')) == -1 )
147 {
148 // No dash means no country.
149 locale = new Locale(language, "");
150 }
151 else
152 {
153 locale = new Locale(language.substring(0, dash),
154 language.substring(dash+1));
155 }
156
157 return locale;
158 }
159 }
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