/*
** Luxor - XML User Interface Language (XUL) Toolkit
** Copyright (c) 2001, 2002 by Gerald Bauer
**
** This program is free software.
**
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE.
**
*/

package luxor.core.config;

import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.*;
import luxor.core.*;
import luxor.status.*;

public class XmlConfigLoader
{
   static Logger T = Logger.getLogger( XmlConfigLoader.class );

   Map _map;
   XmlConfigRoot _root;

   public XmlConfigLoader( Map map )
   {
      _map = map;
   }

   public void load( InputStream in ) throws JDOMException
   {
      SAXBuilder builder = new SAXBuilder();
      Document doc = builder.build( in );

      Element config = doc.getRootElement();
      createElements( null, config );

      if( _root != null )
      {
         // loop over config data and add it to lookup map

         Iterator it = _root.getEntries().iterator();
         while( it.hasNext() )
         {
            XmlConfigNode node = ( XmlConfigNode ) it.next();

            String id = node.getId();
            Object value = node.getValue();
            String clazz = value.getClass().getName();

            T.debug( clazz + ":" + id + "=" + value.toString() );

            _map.put( id, value );
         }
      }
   }

   protected void createElements( XmlConfigContainer parent, Element element )
   {
      String type = element.getName();

      if( type.equals( XmlConfig.Element.CONFIG ) )
      {
         parent = _root = new XmlConfigRoot( element );
      }
      else if( type.equals( XmlConfig.Element.ARRAY ) )
      {
         XmlConfigArray data = new XmlConfigArray( element );
         parent.add( data );
         parent = data;
      }
      else if( type.equals( XmlConfig.Element.INT ) )
      {
         XmlConfigInt data = new XmlConfigInt( element );
         parent.add( data );
      }
      else if( type.equals( XmlConfig.Element.STRING ) )
      {
         XmlConfigString data = new XmlConfigString( element );
         parent.add( data );
      }
      else
      {
         Xul.syntax( "unsupported element '" + type + "' inside xml config file" );
         return;
         // don't process children of unsupported element
      }

      // process children
      List list = element.getChildren();
      for( Iterator it = list.iterator(); it.hasNext();  )
      {
         Element child = ( Element ) it.next();
         createElements( parent, child );
      }
   }
}