/*
* $Id: LocaleAction.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apps.mailreader.actions;
import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Locale;
/**
* <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
* @throws 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);
}
}