/*
* $Header: /home/cvspublic/jakarta-struts/src/example/org/apache/struts/webapp/example/LocaleAction.java,v 1.3 2004/03/12 02:43:29 husted Exp $
* $Revision: 1.3 $
* $Date: 2004/03/12 02:43:29 $
*
* Copyright 2000-2004 Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.struts.webapp.example;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
/**
* <p>Change user's Struts @link(java.util.Locale).</p>
*/
public final class LocaleAction extends BaseAction {
/**
* <p>Return true if parameter is null or trims to empty.</p>
* @param string The string to text; may be null
* @return true if parameter is null or empty
*/
private boolean isBlank(String string) {
return ((string==null) || (string.trim().length()==0));
}
/**
* <p>Parameter for @link(java.util.Locale) language property.
* ["language"]</p>
*/
private static final String LANGUAGE = "language" ;
/**
* <p>Parameter for @link(java.util.Locale) country property.
* ["country"]</p>
*/
private static final String COUNTRY = "country";
/**
* <p>Parameter for response page URI. ["page"]</p>
*/
private static final String PAGE = "page";
/**
* <p>Parameter for response forward name.
* ["forward"]</p>
*/
private static final String FORWARD = "forward";
/**
* <p>Logging message if LocaleAction is missing a target parameter.</p>
*/
private static final String LOCALE_LOG = "LocaleAction: Missing page or forward parameter";
/**
* <p>
* Change the user's Struts @link(java.util.Locale) based on request
* parameters for "language", "country".
* After setting the Locale, control is forwarded to an URI path
* indicated by a "page" parameter, or a forward indicated by a
* "forward" parameter, or to a forward given as the mappings
* "parameter" property.
* The response location must be specified one of these ways.
* </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 An ActionForward indicate the resources that will render the response
* @exception Exception if an input/output error or servlet exception occurs
*/
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
String language = request.getParameter(LANGUAGE);
String country = request.getParameter(COUNTRY);
Locale locale = getLocale(request);
if ((!isBlank(language)) && (!isBlank(country))) {
locale = new Locale(language, country);
}
else if (!isBlank(language)) {
locale = new Locale(language, "");
}
HttpSession session = request.getSession();
session.setAttribute(Globals.LOCALE_KEY, locale);
String target = request.getParameter(PAGE);
if (!isBlank(target)) return new ActionForward(target);
target = request.getParameter(FORWARD);
if (isBlank(target)) target = mapping.getParameter();
if (isBlank(target)) {
log.warn(LOCALE_LOG);
return null;
}
return mapping.findForward(target);
}
}
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