Source Code Cross Referenced for LocaleDetector.java in  » Web-Framework » TURBINE » org » apache » turbine » services » localization » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » TURBINE » org.apache.turbine.services.localization 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.turbine.services.localization;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        import java.util.Locale;
023:        import java.util.StringTokenizer;
024:
025:        import org.apache.commons.configuration.Configuration;
026:
027:        import org.apache.turbine.Turbine;
028:        import org.apache.turbine.util.RunData;
029:
030:        /**
031:         * This class returns a Locale object based on the HTTP
032:         * Accept-Language header.
033:         *
034:         * This class is based on examples from Jason Hunter's book <i>Java
035:         * Servlet Programming</i>.
036:         *
037:         * @author <a href="mailto:frank.kim@clearink.com">Frank Y. Kim</a>
038:         * @author <a href="mailto:jon@collab.net">Jon S. Stevens</a>
039:         * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
040:         * @version $Id: LocaleDetector.java 534527 2007-05-02 16:10:59Z tv $
041:         * @deprecated Use LocaleTokenizer instead.
042:         */
043:        public class LocaleDetector {
044:            /**
045:             * Attempts to pull the "Accept-Language" header out of the
046:             * HttpServletRequest object and then parse it.  If the header is
047:             * not present, it will return a null Locale.
048:             *
049:             * @param data Turbine information.
050:             * @return A Locale.
051:             */
052:            public static Locale getLocale(RunData data) {
053:                String header = data.getRequest().getHeader("Accept-Language");
054:                if (header == null || header.length() == 0)
055:                    return null;
056:                return getLocale(header);
057:            }
058:
059:            /**
060:             * This method parses the Accept-Language header and attempts to
061:             * create a Locale out of it.
062:             *
063:             * @param languageHeader A String with the language header.
064:             * @return A Locale.
065:             */
066:            public static Locale getLocale(String languageHeader) {
067:                Configuration conf = Turbine.getConfiguration();
068:
069:                // return a "default" locale
070:                if (languageHeader == null || languageHeader.trim().equals("")) {
071:                    return new Locale(conf.getString("locale.default.language",
072:                            "en"), conf.getString("locale.default.country",
073:                            "US"));
074:                }
075:
076:                // The HTTP Accept-Header is something like
077:                //
078:                // "en, es;q=0.8, zh-TW;q=0.1"
079:                StringTokenizer tokenizer = new StringTokenizer(languageHeader,
080:                        ",");
081:
082:                // while ( tokenizer.hasMoreTokens() )
083:                // {
084:                String language = tokenizer.nextToken();
085:                // This should never be true but just in case
086:                // if ( !language.trim().equals("") )
087:                return getLocaleForLanguage(language.trim());
088:                // }
089:            }
090:
091:            /**
092:             * This method creates a Locale from the language.
093:             *
094:             * @param language A String with the language.
095:             * @return A Locale.
096:             */
097:            private static Locale getLocaleForLanguage(String language) {
098:                Locale locale;
099:                int semi, dash;
100:
101:                // Cut off any q-value that comes after a semicolon.
102:                if ((semi = language.indexOf(';')) != -1) {
103:                    language = language.substring(0, semi);
104:                }
105:
106:                language = language.trim();
107:
108:                // Create a Locale from the language.  A dash may separate the
109:                // language from the country.
110:                if ((dash = language.indexOf('-')) == -1) {
111:                    // No dash means no country.
112:                    locale = new Locale(language, "");
113:                } else {
114:                    locale = new Locale(language.substring(0, dash), language
115:                            .substring(dash + 1));
116:                }
117:
118:                return locale;
119:            }
120:        }
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