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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;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.Vector;
/**
* Util to process the "Accept-Language" header. Used by facade to implement
* getLocale() and by StaticInterceptor.
*
* Not optimized - it's very slow.
*
* @author James Duncan Davidson [duncan@eng.sun.com]
* @author James Todd [gonzo@eng.sun.com]
* @author Jason Hunter [jch@eng.sun.com]
* @author Harish Prabandham
* @author costin@eng.sun.com
*/
public class AcceptLanguage {
public static Locale getLocale(String acceptLanguage) {
if( acceptLanguage == null ) return Locale.getDefault();
Hashtable<String,Vector<String>> languages =
new Hashtable<String,Vector<String>>();
Vector<Double> quality = new Vector<Double>();
processAcceptLanguage(acceptLanguage, languages, quality);
if (languages.size() == 0) return Locale.getDefault();
Vector<Locale> l = new Vector<Locale>();
extractLocales( languages,quality, l);
return (Locale)l.elementAt(0);
}
public static Enumeration getLocales(String acceptLanguage) {
// Short circuit with an empty enumeration if null header
if (acceptLanguage == null) {
Vector<Locale> v = new Vector<Locale>();
v.addElement(Locale.getDefault());
return v.elements();
}
Hashtable<String,Vector<String>> languages =
new Hashtable<String,Vector<String>>();
Vector<Double> quality=new Vector<Double>();
processAcceptLanguage(acceptLanguage, languages , quality);
if (languages.size() == 0) {
Vector<Locale> v = new Vector<Locale>();
v.addElement(Locale.getDefault());
return v.elements();
}
Vector<Locale> l = new Vector<Locale>();
extractLocales( languages, quality , l);
return l.elements();
}
private static void processAcceptLanguage( String acceptLanguage,
Hashtable<String,Vector<String>> languages, Vector<Double> 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<String> v;
if (languages.containsKey(key)) {
v = languages.get(key) ;
} else {
v= new Vector<String>();
q.addElement(qValue);
}
v.addElement(language);
languages.put(key, v);
}
}
}
private static void extractLocales(Hashtable languages, Vector q,
Vector<Locale> 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(language, country));
}
}
}
}
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