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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.i18n;
import net.sourceforge.subsonic.service.*;
import net.sourceforge.subsonic.domain.*;
import org.springframework.web.servlet.*;
import javax.servlet.http.*;
import java.util.*;
/**
* Locale resolver implementation which returns the locale selected in the settings.
*
* @author Sindre Mehus
*/
public class SubsonicLocaleResolver implements LocaleResolver {
private SecurityService securityService;
private SettingsService settingsService;
private Set<Locale> locales;
/**
* Resolve the current locale via the given request.
*
* @param request Request to be used for resolution.
* @return The current locale.
*/
public Locale resolveLocale(HttpServletRequest request) {
Locale locale = (Locale) request.getAttribute("subsonic.locale");
if (locale != null) {
return locale;
}
// Optimization: Cache locale in the request.
locale = doResolveLocale(request);
request.setAttribute("subsonic.locale", locale);
return locale;
}
private Locale doResolveLocale(HttpServletRequest request) {
Locale locale = null;
// Look for user-specific locale.
String username = securityService.getCurrentUsername(request);
if (username != null) {
UserSettings userSettings = settingsService.getUserSettings(username);
if (userSettings != null) {
locale = userSettings.getLocale();
}
}
if (locale != null && localeExists(locale)) {
return locale;
}
// Return system locale.
locale = settingsService.getLocale();
return localeExists(locale) ? locale : Locale.ENGLISH;
}
/**
* Returns whether the given locale exists.
* @param locale The locale.
* @return Whether the locale exists.
*/
private synchronized boolean localeExists(Locale locale) {
// Lazily create set of locales.
if (locales == null) {
locales = new HashSet<Locale>(Arrays.asList(settingsService.getAvailableLocales()));
}
return locales.contains(locale);
}
public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
throw new UnsupportedOperationException("Cannot change locale - use a different locale resolution strategy");
}
public void setSecurityService(SecurityService securityService) {
this.securityService = securityService;
}
public void setSettingsService(SettingsService settingsService) {
this.settingsService = settingsService;
}
}
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