/*

  * 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.io.InputStream;

 import java.net.URI;

 import java.net.URL;

 import java.util.Properties;

 import java.util.prefs.Preferences;

 import java.util.prefs.PreferencesFactory;

 public class IniPreferencesFactory implements PreferencesFactory

 {

     public static final String PROPERTIES = "ini4j.properties";

     public static final String KEY_USER = "org.ini4j.prefs.user";

     public static final String KEY_SYSTEM = "org.ini4j.prefs.system";

     private Preferences _system;

     private Preferences _user;

     @Override public synchronized Preferences systemRoot()

     {

         if (_system == null)

         {

             _system = newIniPreferences(KEY_SYSTEM);

         }

         return _system;

     }

     @Override public synchronized Preferences userRoot()

     {

         if (_user == null)

         {

             _user = newIniPreferences(KEY_USER);

         }

         return _user;

     }

     String getIniLocation(String key)

     {

         String location = Config.getSystemProperty(key);

         if (location == null)

         {

             try

             {

                 Properties props = new Properties();

                 props.load(Thread.currentThread().getContextClassLoader().getResourceAsStream(PROPERTIES));

                 location = props.getProperty(key);

             }

             catch (Exception x)

             {

                 assert true;

             }

         }

         return location;

     }

     URL getResource(String location) throws IllegalArgumentException

     {

         try

         {

             URI uri = new URI(location);

             URL url;

             if (uri.getScheme() == null)

             {

                 url = Thread.currentThread().getContextClassLoader().getResource(location);

             }

             else

             {

                 url = uri.toURL();

             }

             return url;

         }

         catch (Exception x)

         {

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

         }

     }

     InputStream getResourceAsStream(String location) throws IllegalArgumentException

     {

         try

         {

             return getResource(location).openStream();

         }

         catch (Exception x)

         {

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

         }

     }

     Preferences newIniPreferences(String key)

     {

         Ini ini = new Ini();

         String location = getIniLocation(key);

         if (location != null)

         {

             try

             {

                 ini.load(getResourceAsStream(location));

             }

             catch (Exception x)

             {

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

             }

         }

         return new IniPreferences(ini);

     }

 }