package org.akaza.openclinica.web.filter;
import java.io.IOException;
import java.util.Locale;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.jstl.core.Config;
import org.akaza.openclinica.i18n.core.LocaleResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Filter for applying the OpenClinica's Locale
*
* @since Jan. 2012
*/
// @author ywang
public final class LocaleFilter implements Filter {
private final Logger logger = LoggerFactory.getLogger(getClass().getName());
/**
* Save customized Locale into session for Locale attribute and fmt Locale; and set response Locale
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse resp = (HttpServletResponse)response;
updateLocale(req,resp,LocaleResolver.resolveLocale(req));
if (chain != null) {
chain.doFilter(request, response);
}
}
public void init(FilterConfig filterConfig) throws ServletException {
}
public void destroy() {
}
private void updateLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
if(locale != null) {
HttpSession session = request.getSession(false);
if(session != null) {
session.setAttribute(LocaleResolver.getLocaleSessionAttributeName(), locale);
Config.set(session, Config.FMT_LOCALE, locale);
if(response != null) response.setLocale(locale);
} else {
logger.debug("Locale can not be saved into session because session is null.");
}
} else {
logger.debug("No Locale updating has been done because passed Locale is null.");
}
}
}