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  /*
   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You under the Apache License, Version 2.0
   *  (the "License"); you may not use this file except in compliance with
   *  the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
 
 package org.apache.tomcat.util.http;
 
Util to process the "Accept-Language" header. Used by facade to implement getLocale() and by StaticInterceptor. Not optimized - it's very slow.

Author(s):
James Duncan Davidson [duncan@eng.sun.com]
James Todd [gonzo@eng.sun.com]
Jason Hunter [jch@eng.sun.com]
Harish Prabandham
costin@eng.sun.com
 
 public class AcceptLanguage {
 
     public static Locale getLocale(String acceptLanguage) {
 	ifacceptLanguage == null ) return Locale.getDefault();
 
         Hashtable languages = new Hashtable();
         Vector quality=new Vector();
         processAcceptLanguage(acceptLanguagelanguages,quality);
 
         if (languages.size() == 0) return Locale.getDefault();
 
         Vector l = new Vector();
         extractLocaleslanguages,qualityl);
 
         return (Locale)l.elementAt(0);
     }
 
     public static Enumeration getLocales(String acceptLanguage) {
     	// Short circuit with an empty enumeration if null header
         if (acceptLanguage == null) {
             Vector v = new Vector();
             v.addElement(Locale.getDefault());
             return v.elements();
         }
 	
         Hashtable languages = new Hashtable();
         Vector quality=new Vector();
     	processAcceptLanguage(acceptLanguagelanguages , quality);
 
         if (languages.size() == 0) {
             Vector v = new Vector();
             v.addElement(Locale.getDefault());
             return v.elements();
         }
     	Vector l = new Vector();
     	extractLocaleslanguagesquality , l);
     	return l.elements();
     }
 
     private static void processAcceptLanguageString acceptLanguage,
 					      Hashtable languagesVector q)
     {
         StringTokenizer languageTokenizer =
             new StringTokenizer(acceptLanguage",");
 
         while (languageTokenizer.hasMoreTokens()) {
             String language = languageTokenizer.nextToken().trim();
             int qValueIndex = language.indexOf(';');
             int qIndex = language.indexOf('q');
             int equalIndex = language.indexOf('=');
             Double qValue = new Double(1);
 
             if (qValueIndex > -1 &&
                     qValueIndex < qIndex &&
                     qIndex < equalIndex) {
     	        String qValueStr = language.substring(qValueIndex + 1);
                 language = language.substring(0, qValueIndex);
                 qValueStr = qValueStr.trim().toLowerCase(.);
                 qValueIndex = qValueStr.indexOf('=');
                 qValue = new Double(0);
                 if (qValueStr.startsWith("q") &&
                     qValueIndex > -1) {
                    qValueStr = qValueStr.substring(qValueIndex + 1);
                    try {
                        qValue = new Double(qValueStr.trim());
                    } catch (NumberFormatException nfe) {
                    }
                }
            }
            // XXX
            // may need to handle "*" at some point in time
            if (! language.equals("*")) {
                String key = qValue.toString();
                Vector v;
                if (languages.containsKey(key)) {
                    v = (Vector)languages.get(key) ;
                } else {
                    vnew Vector();
                    q.addElement(qValue);
                }
                v.addElement(language);
                languages.put(keyv);
            }
        }
    }
    private static void extractLocales(Hashtable languagesVector q,Vector l)
    {
        // XXX We will need to order by q value Vector in the Future ?
        Enumeration e = q.elements();
        while (e.hasMoreElements()) {
            Vector v =
                (Vector)languages.get(((Double)e.nextElement()).toString());
            Enumeration le = v.elements();
            while (le.hasMoreElements()) {
    	        String language = (String)le.nextElement();
	        	String country = "";
        		int countryIndex = language.indexOf("-");
                if (countryIndex > -1) {
                    country = language.substring(countryIndex + 1).trim();
                    language = language.substring(0, countryIndex).trim();
                }
                l.addElement(new Locale(languagecountry));
            }
        }
    }
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