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WebResourceManager |
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/* ** 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.http.loader; import java.util.*; import luxor.core.*; import luxor.http.resource.*; import luxor.spi.*; import luxor.status.*; public class WebResourceManager implements WebResourceLoader { static Logger T = Logger.getLogger( WebResourceManager.class ); private static WebResourceManager __instance; /** * The List of templateLoaders that the Runtime will use to locate the * InputStream source of a template. */ 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 getWebResourceManager() { 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; } Xul.error( "failed to retrieve resource '" + name + "'" ); // resource not found return new Error404Resource( name ); } public void addResourceLoader( WebResourceLoader newLoader ) { // todo: make this hack for one class more generic // remove previous resource loaders with same context if( newLoader instanceof FileContextResourceLoader ) { FileContextResourceLoader newCtxLoader = ( FileContextResourceLoader ) newLoader; Iterator it = _resourceLoaders.iterator(); while( it.hasNext() ) { WebResourceLoader loader = ( WebResourceLoader ) it.next(); if( loader instanceof FileContextResourceLoader ) { FileContextResourceLoader ctxLoader = ( FileContextResourceLoader ) loader; if( ctxLoader.getContext().equalsIgnoreCase( newCtxLoader.getContext() ) ) it.remove(); } } } _resourceLoaders.add( newLoader ); } }
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