/**
* 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.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.displaytag.Messages;
import org.springframework.context.MessageSource;
import org.springframework.web.servlet.support.RequestContextUtils;
/**
* Spring implementation of a resource provider and locale resolver. Since Displaytag locale resolution is modelled on
* the Spring one, it simply forward <code>resolveLocale</code> calls to the Spring-configured LocaleResolver.
* @author Fabrizio Giustina
* @version $Revision: 737 $ ($Author: fgiust $)
*/
public class I18nSpringAdapter implements LocaleResolver, I18nResourceProvider
{
/**
* prefix/suffix for missing entries.
*/
public static final String UNDEFINED_KEY = "???"; //$NON-NLS-1$
/**
* logger.
*/
private static Log log = LogFactory.getLog(I18nSpringAdapter.class);
/**
* @see LocaleResolver#resolveLocale(HttpServletRequest)
*/
public Locale resolveLocale(HttpServletRequest request)
{
return RequestContextUtils.getLocale(request);
}
/**
* @see I18nResourceProvider#getResource(String, String, Tag, PageContext)
*/
public String getResource(String resourceKey, String defaultValue, Tag tag, PageContext pageContext)
{
MessageSource messageSource = RequestContextUtils.getWebApplicationContext(pageContext.getRequest());
if (messageSource == null)
{
log.warn("messageSource not found");
return null;
}
// if resourceKey isn't defined either, use defaultValue
String key = (resourceKey != null) ? resourceKey : defaultValue;
String message = null;
message = messageSource.getMessage(key, null, null, RequestContextUtils
.getLocale((HttpServletRequest) pageContext.getRequest()));
// if user explicitely added a titleKey we guess this is an error
if (message == null && resourceKey != null)
{
log.debug(Messages.getString("Localization.missingkey", resourceKey)); //$NON-NLS-1$
message = UNDEFINED_KEY + resourceKey + UNDEFINED_KEY;
}
return message;
}
}