001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.util;
016    
017    import java.net.MalformedURLException;
018    import java.net.URL;
019    import java.util.Locale;
020    
021    import javax.servlet.ServletContext;
022    
023    import org.apache.commons.logging.Log;
024    import org.apache.commons.logging.LogFactory;
025    import org.apache.hivemind.Resource;
026    
027    /**
028     * Implementation of {@link org.apache.hivemind.Resource} for resources found within the web
029     * application context.
030     * <p>
031     * Note: moved from Tapestry. Originally part of Tapestry 3.0.
032     * 
033     * @author Howard Lewis Ship
034     * @since 1.1
035     */
036    
037    public class ContextResource extends AbstractResource
038    {
039        private static final Log LOG = LogFactory.getLog(ContextResource.class);
040    
041        private ServletContext _context;
042    
043        public ContextResource(ServletContext context, String path)
044        {
045            this(context, path, null);
046        }
047    
048        public ContextResource(ServletContext context, String path, Locale locale)
049        {
050            super(path, locale);
051    
052            _context = context;
053        }
054    
055        /**
056         * Locates the resource using {@link LocalizedContextResourceFinder} and
057         * {@link ServletContext#getResource(java.lang.String)}.
058         */
059    
060        public Resource getLocalization(Locale locale)
061        {
062            LocalizedContextResourceFinder finder = new LocalizedContextResourceFinder(_context);
063    
064            String path = getPath();
065            LocalizedResource localizedResource = finder.resolve(path, locale);
066    
067            if (localizedResource == null)
068                return null;
069    
070            String localizedPath = localizedResource.getResourcePath();
071            Locale pathLocale = localizedResource.getResourceLocale();
072    
073            if (localizedPath == null)
074                return null;
075    
076            if (path.equals(localizedPath))
077                return this;
078    
079            return new ContextResource(_context, localizedPath, pathLocale);
080        }
081    
082        public URL getResourceURL()
083        {
084            try
085            {
086                return _context.getResource(getPath());
087            }
088            catch (MalformedURLException ex)
089            {
090                LOG.warn(UtilMessages.unableToReferenceContextPath(getPath(), ex), ex);
091    
092                return null;
093            }
094        }
095    
096        public String toString()
097        {
098            return "context:" + getPath();
099        }
100    
101        public int hashCode()
102        {
103            return 4197 & getPath().hashCode();
104        }
105    
106        protected Resource newResource(String path)
107        {
108            return new ContextResource(_context, path);
109        }
110    
111    }