/*

  * Copyright 2005,2009 Ivan SZKIBA

  *

  * 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.ini4j;

 import java.net.MalformedURLException;

 import java.net.URL;

 import javax.servlet.ServletContext;

 import javax.servlet.ServletContextEvent;

 import javax.servlet.ServletContextListener;

 public class IniPreferencesFactoryListener extends IniPreferencesFactory implements ServletContextListener

 {

     public static final String DEFAULT_USER_LOCATION = "/WEB-INF/user.ini";

     public static final String DEFAULT_SYSTEM_LOCATION = "/WEB-INF/system.ini";

     private ServletContext _context;

     @Override public void contextDestroyed(ServletContextEvent event)

     {

         _context = null;

     }

     @Override public void contextInitialized(ServletContextEvent event)

     {

         _context = event.getServletContext();

         System.setProperty("java.util.prefs.PreferencesFactory", getClass().getName());

     }

     @Override protected String getIniLocation(String key)

     {

         String location = _context.getInitParameter(key);

         if (location == null)

         {

             location = key.equals(KEY_USER) ? DEFAULT_USER_LOCATION : DEFAULT_SYSTEM_LOCATION;

         }

         return location;

     }

     @Override protected URL getResource(String location) throws IllegalArgumentException

     {

         try

         {

             URL url = _context.getResource(location);

             if (url == null)

             {

                 url = super.getResource(location);

             }

             return url;

         }

         catch (MalformedURLException x)

         {

             throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);

         }

     }

 }