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WebResourceManager |
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/* ** 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.http.loader; import java.util.*; import houston.*; import rachel.http.*; import rachel.http.resource.*; import rachel.util.*; public class WebResourceManager implements WebResourceLoader { static Logger T = Logger.getLogger( WebResourceManager.class ); private static WebResourceManager _instance; private static ArrayList _resourceLoaders = new ArrayList(); /** * WebResourceManager is a singleton, don't allow creation of any instances * outside this class. */ private WebResourceManager() { } public static WebResourceManager getInstance() { if( _instance == null ) _instance = new WebResourceManager(); return _instance; } public WebResource getResource( String name ) { for( int i = 0; i < _resourceLoaders.size(); i++ ) { WebResourceLoader resourceLoader = ( WebResourceLoader ) _resourceLoaders.get( i ); WebResource res = resourceLoader.getResource( name ); if( res != null ) // bingo! return res; } T.error( "*** resource " + name + " not found" ); // resource not found return new ErrorResource( Http.Error.NOT_FOUND_404 ); } public static void addResourceLoader( WebResourceLoader loader ) { getInstance().addResourceLoaderImpl( loader ); } private void addResourceLoaderImpl( WebResourceLoader loader ) { _resourceLoaders.add( loader ); } }
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WebResourceManager |
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