001    // Copyright 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.tapestry.web;
016    
017    import java.net.URL;
018    import java.util.Locale;
019    
020    import org.apache.hivemind.Resource;
021    import org.apache.hivemind.util.AbstractResource;
022    import org.apache.hivemind.util.LocalizedResource;
023    
024    /**
025     * Implementation of {@link org.apache.hivemind.Resource}for resources found within a
026     * {@link org.apache.tapestry.web.WebContext}.
027     * 
028     * @author Howard Lewis Ship
029     * @since 4.0
030     */
031    
032    public class WebContextResource extends AbstractResource
033    {
034        private WebContext _context;
035    
036        public WebContextResource(WebContext context, String path)
037        {
038            this(context, path, null);
039        }
040    
041        public WebContextResource(WebContext context, String path, Locale locale)
042        {
043            super(path, locale);
044    
045            _context = context;
046        }
047    
048        /**
049         * Locates the resource using {@link LocalizedWebContextResourceFinder}and
050         * {@link ServletContext#getResource(java.lang.String)}.
051         */
052    
053        public Resource getLocalization(Locale locale)
054        {
055            LocalizedWebContextResourceFinder finder = new LocalizedWebContextResourceFinder(_context);
056    
057            String path = getPath();
058            LocalizedResource localizedResource = finder.resolve(path, locale);
059    
060            if (localizedResource == null)
061                return null;
062    
063            String localizedPath = localizedResource.getResourcePath();
064            Locale pathLocale = localizedResource.getResourceLocale();
065    
066            if (localizedPath == null)
067                return null;
068    
069            if (path.equals(localizedPath))
070                return this;
071    
072            return new WebContextResource(_context, localizedPath, pathLocale);
073        }
074    
075        public URL getResourceURL()
076        {
077            return _context.getResource(getPath());
078        }
079    
080        public String toString()
081        {
082            return "context:" + getPath();
083        }
084    
085        public int hashCode()
086        {
087            return 2387 & getPath().hashCode();
088        }
089    
090        protected Resource newResource(String path)
091        {
092            return new WebContextResource(_context, path);
093        }
094    
095    }