/**
* Licensed under the Artistic License; you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://displaytag.sourceforge.net/license.html
*
* THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
package org.displaytag.localization;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
import org.apache.struts.Globals;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.util.MessageResources;
/**
* Struts implementation of a resource provider and locale resolver. Uses Struts
* <code>RequestUtils.getUserLocale()</code> and <code>TagUtils.message()</code> for the lookup.
* @author Fabrizio Giustina
* @version $Revision$ ($Author$)
*/
public class I18nStrutsAdapter implements I18nResourceProvider, LocaleResolver
{
/**
* prefix/suffix for missing entries.
*/
public static final String UNDEFINED_KEY = "???"; //$NON-NLS-1$
/**
* @see LocaleResolver#resolveLocale(HttpServletRequest)
*/
public Locale resolveLocale(HttpServletRequest request)
{
Locale userLocale = null;
HttpSession session = request.getSession(false);
// Only check session if sessions are enabled
if (session != null)
{
userLocale = (Locale) session.getAttribute(Globals.LOCALE_KEY);
}
if (userLocale == null)
{
// Returns Locale based on Accept-Language header or the server default
userLocale = request.getLocale();
}
return userLocale;
}
/**
* @see I18nResourceProvider#getResource(String, String, Tag, PageContext)
*/
public String getResource(String resourceKey, String defaultValue, Tag tag, PageContext pageContext)
{
// if titleKey isn't defined either, use property
String key = (resourceKey != null) ? resourceKey : defaultValue;
// retrieve MessageResources. Don't use TagUtils to mantain Struts 1.1 compatibility
MessageResources resources = (MessageResources) pageContext.getAttribute(
Globals.MESSAGES_KEY,
PageContext.REQUEST_SCOPE);
if (resources == null)
{
ModuleConfig moduleConfig = (ModuleConfig) pageContext.getRequest().getAttribute(Globals.MODULE_KEY);
if (moduleConfig == null)
{
moduleConfig = (ModuleConfig) pageContext.getServletContext().getAttribute(Globals.MODULE_KEY);
pageContext.getRequest().setAttribute(Globals.MODULE_KEY, moduleConfig);
}
resources = (MessageResources) pageContext.getAttribute(
Globals.MESSAGES_KEY + moduleConfig.getPrefix(),
PageContext.APPLICATION_SCOPE);
}
if (resources == null)
{
resources = (MessageResources) pageContext
.getAttribute(Globals.MESSAGES_KEY, PageContext.APPLICATION_SCOPE);
}
String title = null;
if (resources != null)
{
Locale userLocale = resolveLocale((HttpServletRequest) pageContext.getRequest());
title = resources.getMessage(userLocale, key);
}
// if user explicitely added a titleKey we guess this is an error
if (title == null && resourceKey != null)
{
title = UNDEFINED_KEY + resourceKey + UNDEFINED_KEY;
}
return title;
}
}