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package org.apache.tomcat.util.http;
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
/**
* 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 [[email protected]]
* @author James Todd [[email protected]]
* @author Jason Hunter [[email protected]]
* @author Harish Prabandham
* @author [email protected]
*/
public class AcceptLanguage {
public static Locale getLocale(String acceptLanguage) {
if( acceptLanguage == null ) return Locale.getDefault();
Hashtable languages = new Hashtable();
Vector quality=new Vector();
processAcceptLanguage(acceptLanguage, languages,quality);
if (languages.size() == 0) return Locale.getDefault();
Vector l = new Vector();
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 v = new Vector();
v.addElement(Locale.getDefault());
return v.elements();
}
Hashtable languages = new Hashtable();
Vector quality=new Vector();
processAcceptLanguage(acceptLanguage, languages , quality);
if (languages.size() == 0) {
Vector v = new Vector();
v.addElement(Locale.getDefault());
return v.elements();
}
Vector l = new Vector();
extractLocales( languages, quality , l);
return l.elements();
}
private static void processAcceptLanguage( String acceptLanguage,
Hashtable languages, Vector 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 {
v= new Vector();
q.addElement(qValue);
}
v.addElement(language);
languages.put(key, v);
}
}
}
private static void extractLocales(Hashtable languages, Vector 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(language, country));
}
}
}
}