AcceptHeaderLocaleResolver and multiple locales

[ftibbitts]

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

[y.legros]

Hi Fred,

Do you find any solution to resolve entire list?

Thanks,
Yannick.

[y.legros]

workaround that i have wrote :

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);
	}

}

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

Yannick.