/*
    * Copyright 2001-2008 The 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.juddi.webconsole.resources;
  
  import java.util.HashMap;
  import java.util.Locale;
  import java.util.Map;
  import java.util.MissingResourceException;
  import java.util.ResourceBundle;
  import javax.servlet.http.HttpSession;
  
  /**
   * This a resource loader for specific locales for internationalization,
   * provides some basic caching to prevent round trip disk access
   *
   * @author <a href="mailto:alexoree@apache.org">Alex O'Ree</a>
   */
  public class ResourceLoader {
  
          private static Map map = new HashMap();
  
          /**
           * returns a localized string in the locale defined within
           * session.getAttribute("locale") or in the default locale, en
           *
           * @param session
           * @param key
           * @return a localized string
           * @throws IllegalArgumentException if the key is null
           * @throws MissingResourceException if the resource bundle can't be
           * found
           */
          public static String GetResource(HttpSession session, String key) throws MissingResourceException {
                  if (key == null) {
                          throw new IllegalArgumentException("key");
                  }
                  String locale = "en";
                  if (session != null) {
                          locale = (String) session.getAttribute("locale");
                  }
                  if (locale==null)
                          locale = "en";
                  return GetResource(locale, key);
          }
  
          /**
           * returns a localized string in the locale defined within locale or in
           * the default locale, en
           *
           * @param locale
           * @param key
           * @return a localized string
           * @throws IllegalArgumentException if the key is null
           * @throws MissingResourceException if the resource bundle can't be
           * found
           */
          public static String GetResource(String locale, String key) throws MissingResourceException {
                  if (key == null) {
                          throw new IllegalArgumentException("key");
                  }
  
                  ResourceBundle bundle = (ResourceBundle) map.get(locale);
                  if (bundle == null) {
                          bundle = ResourceBundle.getBundle("org.apache.juddi.webconsole.resources.web", new Locale(locale));
                          map.put(locale, bundle);
                  }
                  try {
                          return bundle.getString(key.trim());
                  } catch (Exception ex) {
                          return "key " + key + " not found " + ex.getMessage();
                  }
          }
  }