package com.oreilly.strutsckbk.ch12;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.jstl.core.Config;
import javax.servlet.jsp.jstl.fmt.LocalizationContext;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.Globals;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
/**
* Implementation of <strong>Action</strong> that changes the user's
* @link(java.util.Locale and forwards to a page, based on request level
* parameters that are set (language, country, ,variant, & page).
* Also changes the JSTL locale.
*/
public final class ChangeLocaleAction extends Action {
/**
* Commons Logging instance.
*/
private Log log = LogFactory.getFactory().getInstance(this.getClass().getName());
/**
* <p>
* Change the user's @link(java.util.Locale) based on @link(ActionForm)
* properties.
* </p>
* <p>
* This <code>Action</code> looks for <code>language</code> and
* <code>country</code> properties on the given form, constructs an
* appropriate Locale object, and sets it as the Struts Locale for this
* user's session.
* Any <code>ActionForm, including a @link(DynaActionForm), may be used.
* </p>
* <p>
* If a <code>page</code> property is also provided, then after
* setting the Locale, control is forwarded to that URI path.
* Otherwise, control is forwarded to "success".
* </p>
*
* @param mapping The ActionMapping used to select this instance
* @param form The optional ActionForm bean for this request (if any)
* @param request The HTTP request we are processing
* @param response The HTTP response we are creating
*
* @return Action to forward to
* @exception java.lang.Exception if an input/output error or servlet exception occurs
*/
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
// Extract attributes we will need
HttpSession session = request.getSession();
Locale locale = getLocale(request);
String language = null;
String country = null;
String variant = null;
String page = null;
try {
language = (String) PropertyUtils.getSimpleProperty(form, "language");
country = (String) PropertyUtils.getSimpleProperty(form, "country");
variant = (String) PropertyUtils.getSimpleProperty(form, "variant");
page = (String) PropertyUtils.getSimpleProperty(form, "page");
} catch (Exception e) {
log.error(e.getMessage(), e);
}
if ( (language != null && language.length() > 0) &&
(country != null && country.length() > 0) &&
(variant != null && variant.length() > 0) ) {
locale = new java.util.Locale(language, country, variant);
} else if ( (language != null && language.length() > 0) &&
(country != null && country.length() > 0)) {
locale = new java.util.Locale(language, country);
} else if (language != null && language.length() > 0) {
locale = new java.util.Locale(language, "");
}
// reset the Struts locale
session.setAttribute(Globals.LOCALE_KEY, locale);
// reset the JSTL locale
Config.set(session, Config.FMT_LOCALE, locale);
if (null==page || "".equals(page))
return mapping.findForward("success");
else
return new ActionForward(page);
}
}
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