/*
** Rachel  - Resource Loading Toolkit for Web Start/JNLP
** 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 rachel.loader;

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.jar.*;
import houston.*;
import rachel.*;
import rachel.util.*;

public class JarResourceLoaderHelper implements ResourceLoader
{
   static Logger T = Logger.getLogger( JarResourceLoaderHelper.class );

   private File _file;
   private JarFile _jarFile;

   public JarResourceLoaderHelper( File file, JarFile jarFile )
   {
      _file = file;
      _jarFile = jarFile;
   }

   public InputStream getResourceAsStream( String name )
   {
      T.debug( "getResourceAsStream( name=" + name + " )" );

      try
      {
         JarEntry entry = ( JarEntry ) _jarFile.getEntry( name );
         if( entry == null )
            return null;

         return _jarFile.getInputStream( entry );
      }
      catch( IOException ioex )
      {
         Status.error( "*** failed to retrieve resource '" + name + "' inside jar: " + ioex.getMessage() );
         return null;
      }
   }

   public URL getResourceAsUrl( String name )
   {
      T.debug( "getResourceAsUrl( name=" + name + " )" );

      try
      {
         // check if entry exists
         JarEntry entry = ( JarEntry ) _jarFile.getEntry( name );
         if( entry == null )
            return null;

         URL jarURL = new URL(
               "jar:" + _file.toURL() + "!/" + name );

         T.debug( "jarURL=" + jarURL.toExternalForm() );

         return jarURL;
      }
      catch( IOException ioex )
      {
         Status.error( "*** failed to retrieve resource '" + name + "' inside jar: " + ioex.getMessage() );
         return null;
      }
   }
}