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  Tuesday, October 18, 2005

Preferred Locale on AppFuse

The solution provided here are based on locale issues on AppFuse JIRA, specifically, APF-141 which is further refined in APF-142.

Here are the steps to change the request-based locale to user-preferred locale, i.e., implement a session-based locale on AppFuse:
1. Add session-scope PREFERRED_LOCALE and optional request scope DEFAULT_LOCALE constants.
2. Use LoginServlet to set locale session. The parameter, locale, is passed from loginForm.jsp, a selected locale from a dropdown for example.

public final class LoginServlet extends HttpServlet {
...
public void execute(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
...
request.getSession().setAttribute(Constants.PREFERRED_LOCALE, request.getParameter("locale"));
...
}
}

3. Persist preferredLocale for user in ActionFilter:

public class ActionFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain)
throws IOException, ServletException {
...
if ((username != null) && (user == null)) {
...
String preferredLocale = session.getAttribute(Constants.PREFERRED_LOCALE).toString();
if (preferredLocale != null) {
if (preferredLocale "") {
if (user.getPreferredLocale() null) {
user.setPreferredLocale(Constants.DEFAULT_LOCALE);
}
} else {
user.setPreferredLocale(preferredLocale);
}
}
}
session.setAttribute(Constants.PREFERRED_LOCALE, user.getPreferredLocale());
}
}

4. Add locale filter, LocaleFilter:

public class LocaleFilter implements Filter {
private static final transient Log log = LogFactory.getLog(LocaleFilter.class);
public void init(FilterConfig filterConfig) {
}

public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
HttpServletRequest servletRequest = (HttpServletRequest) request;
HttpSession session = servletRequest.getSession(false);

if (log.isDebugEnabled()) {
log.debug(servletRequest.getRequestURL());
}
Locale preferredLocale = null;

if (session!=null){
if (session.getAttribute(Constants.PREFERRED_LOCALE) != null) {
String localeKey = session.getAttribute(Constants.PREFERRED_LOCALE).toString();
if (localeKey != null) {
if (localeKey.equals("")) {
String[] keys = Constants.DEFAULT_LOCALE.split("-");
preferredLocale = new Locale(keys[0],keys[1]);
} else {
String[] keys = localeKey.split("-");
preferredLocale = new Locale(keys[0],keys[1]);
}
}
}
}
if (null != preferredLocale
&& !(request instanceof LocaleResponseWrapper)) {
request = new LocaleResponseWrapper(servletRequest, preferredLocale);
}

chain.doFilter(request, response);
}
}

5. The associated LocaleResponseWrapper is equivalent to LocaleRequestWrapper:

public class LocaleResponseWrapper extends HttpServletRequestWrapper {
private final Locale preferredLocale;
private Enumeration locales;

public LocaleResponseWrapper(HttpServletRequest request, Locale sessionLocale) {
super(request);
preferredLocale = sessionLocale;
}

public Locale getLocale() {
if (null != preferredLocale) {
return preferredLocale;
} else {
return super.getLocale();
}
}
public Enumeration getLocales() {
if (null != preferredLocale) {
return setLocales();
} else {
return super.getLocales();
}
}
private Enumeration setLocales() {
if (null == locales) {
List l = Collections.list(super.getLocales());
l.add(0, preferredLocale);
locales = Collections.enumeration(l);
}
return locales;
}
}

6. Put the locale filter in web.xml or appfuse/metadata/web/filters.xml:

<filter>
<filter-name>localeFilter</filter-name>
<display-name>Locale Filter</display-name>
<filter-class>org.appfuse.webapp.filter.LocaleFilter</filter-class>
</filter>

7. Modify JSP’s: add page-scope locale setting:

<fmt:setLocale value="${preferredLocale}" />


Now AppFuse is powered by preferred locale!
 

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