/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.portal.application.localization;
import java.util.List;
import java.util.Locale;
import org.exoplatform.services.resources.LocaleContextInfo;
import org.exoplatform.services.resources.LocalePolicy;
import org.picocontainer.Startable;
/**
* This service represents a default policy for determining LocaleConfig to be used for user's session. This service is
* registered through portal services configuration file: conf/portal/configuration.xml Custom locale determination policy can
* be implemented by overriding or completely replacing this class, and registering an alternative implementation.
*
* To gracefully fallback from more specific locales (lang_COUNTRY) to more generic (lang) without loss of information about
* user's language selection use {@link LocaleContextInfo#getLocaleIfLangSupported(java.util.Locale)} and return a more specific
* Locale. The Locale will be appropriately narrowed by LocalePolicy caller.
*
* Special care needs to be taken to assure Locale consistency between portal requests and non-portal requests - like login
* redirect upon failed authentication attempt. To keep consistency at least one of {@link LocaleContextInfo#cookieLocales} and
* {@link LocaleContextInfo#sessionLocale} needs to be enabled.
*
* @see NoBrowserLocalePolicyService
* @see LocalizationFilter
*
* @author <a href="mailto:mstrukel@redhat.com">Marko Strukelj</a>
*/
public class DefaultLocalePolicyService implements LocalePolicy, Startable {
/**
* @see LocalePolicy#determineLocale(LocaleContextInfo)
*/
public Locale determineLocale(LocaleContextInfo context) {
if (context.getRequestLocale() != null) {
return context.getRequestLocale();
}
//
Locale locale = null;
if (context.getRemoteUser() == null)
locale = getLocaleConfigForAnonymous(context);
else
locale = getLocaleConfigForRegistered(context);
if (locale == null)
locale = context.getPortalLocale();
return locale;
}
/**
* Override this method to change the LocaleConfig determination for registered users. Default is: use user's profile
* language, if not available fall back to LOCALE cookie, and finally if that is not available either fall back to browser
* language preference.
*
* @param context locale context info available to implementations in order to determine appropriate Locale
* @return Locale representing a language to use, or null
*/
protected Locale getLocaleConfigForRegistered(LocaleContextInfo context) {
Locale locale = context.getLocaleIfLangSupported(context.getUserProfileLocale());
if (locale == null)
locale = getLocaleConfigFromCookie(context);
if (locale == null)
locale = getLocaleConfigFromSession(context);
if (locale == null)
locale = getLocaleConfigFromBrowser(context);
return locale;
}
/**
* Override this method to change the Locale determination based on browser language preferences. If you want to disable the
* use of browser language preferences simply return null.
*
* @param context locale context info available to implementations in order to determine appropriate Locale
* @return Locale representing a language to use, or null
*/
protected Locale getLocaleConfigFromBrowser(LocaleContextInfo context) {
List<Locale> locales = context.getBrowserLocales();
if (locales != null) {
for (Locale loc : locales)
return context.getLocaleIfLangSupported(loc);
}
return null;
}
/**
* Override this method to change Locale determination for users that aren't logged in. By default the request's LOCALE
* cookie is used, if that is not available the browser language preferences are used.
*
* @param context locale context info available to implementations in order to determine appropriate Locale
* @return Locale representing a language to use, or null
*/
protected Locale getLocaleConfigForAnonymous(LocaleContextInfo context) {
Locale locale = getLocaleConfigFromCookie(context);
if (locale == null)
locale = getLocaleConfigFromSession(context);
if (locale == null)
locale = getLocaleConfigFromBrowser(context);
return locale;
}
/**
* Override this method to change the Locale determination based on session attribute. Note: this is mostly a backup for
* cookie, as either one usually has to be enabled for locale to remain synchronized between portal and non-portal pages.
*
* @param context locale context info available to implementations in order to determine appropriate Locale
* @return Locale representing a language to use, or null
*/
protected Locale getLocaleConfigFromSession(LocaleContextInfo context) {
return context.getSessionLocale();
}
/**
* Override this method to change the Locale determination based on browser cookie. If you want to disable the use of
* browser cookies simply return null.
*
* @param context locale context info available to implementations in order to determine appropriate Locale
* @return Locale representing a language to use, or null
*/
protected Locale getLocaleConfigFromCookie(LocaleContextInfo context) {
List<Locale> locales = context.getCookieLocales();
if (locales != null) {
for (Locale locale : locales)
return context.getLocaleIfLangSupported(locale);
}
return null;
}
/**
* Starter interface method
*/
public void start() {
}
/**
* Starter interface method
*/
public void stop() {
}
}