AcceptHeaderLocaleResolver and multiple locales

The AcceptHeaderLocaleResolver appears to only care about the first language in the HTTP accept-language header element. It would be nice if the locale resolver would use the entire set of locales and not just the first one.

Does anybody have an implementation of a LocaleResolver that attempts to resolve using the entire list?

Thanks,

-Fred

Hi Fred,

Do you find any solution to resolve entire list?

Thanks,
Yannick.

workaround that i have wrote :

Code:

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package com.sarbacane.forms.localResolver;

import java.io.File;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.AbstractLocaleResolver;

/**
 * Personal Implementation of LocaleResolver that is like AcceptHeaderLocaleResolver but accepts setLocal.
 * So this LocaleResolver works fine with a LocaleChangeInterceptor.
 * This AcceptHeaderLocaleResolver consider also all elements of locales request list.
 *
 * @author Yannick Legros
 * @since 05.12.2012
 */
public class AcceptHeaderLocaleResolver extends AbstractLocaleResolver implements LocaleResolver {
       
        private final String urllocalAttributeName = "urllocal";
        private final String propertiesFilesPrefix = "messages_";
        private final String propertiesFilesSuffix = ".properties";
        private final String propertiesPath = "/WEB-INF/classes";
       
        private List<String> definedLanguage = null;

        public Locale resolveLocale(HttpServletRequest request) { 

                if(request.getAttribute(urllocalAttributeName)!=null)
                        return (Locale) request.getAttribute(urllocalAttributeName);
               
                return getFirstExistingLocale(request);
        }
       
        private Locale getFirstExistingLocale(HttpServletRequest request) {
               
                if(definedLanguage==null)
                        definedLanguage = getDefinedLanguages(request);
               
                @SuppressWarnings("unchecked")
                Enumeration<Locale> requestLocales = request.getLocales();
                while(requestLocales.hasMoreElements()){
                        Locale locale = requestLocales.nextElement();
                        if(definedLanguage.contains(locale.getLanguage()))
                                return locale;
                }
               
                //if no one request locals is define => return first locale of request
                return request.getLocale();
               
        }

        private List<String> getDefinedLanguages(HttpServletRequest request){
               
                List<String> languages = new ArrayList<String>(); 
                String languagesFolderPath = request.getSession().getServletContext().getRealPath(propertiesPath); 
                File folder = new File(languagesFolderPath); 
                File[] listOfFiles = folder.listFiles(); 

                for (int i = 0; i < listOfFiles.length; i++){ 
                  String fileName = listOfFiles[i].getName();
                  if (fileName.startsWith(propertiesFilesPrefix) && fileName.endsWith(propertiesFilesSuffix)){ 
                      // Extract the language code, which is between the underscore and the .properties extension 
                      String language = fileName.substring(9, fileName.indexOf(propertiesFilesSuffix)); 
                      languages.add(language); 
                  } 
                }
               
                return languages;
               
        }

        public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
                request.setAttribute(urllocalAttributeName, locale);
        }

}

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if someone have better or cleaner things to do i will be happy to get it.

Yannick.