001    /*
002     * Copyright 2006 Stephen McConnell.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *     http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package net.dpml.http;
017    
018    import net.dpml.logging.Logger;
019    
020    /**
021     * Context handler with enhanced support for symbolic property dereferencing. 
022     * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
023     * @version 0.0.1
024     */
025    public class ResourceContextHandler extends org.mortbay.jetty.handler.ContextHandler
026    {
027       /**
028        * HTTP static resource context handler parameters.
029        */
030        public interface Context extends ContextHandlerContext
031        {
032           /**
033            * Get the http context resource base.  The value may contain symbolic
034            * property references and should resolve to a local directory.
035            *
036            * @return the resource base
037            */
038            String getResourceBase();
039        }
040        
041       /**
042        * Creation of a new resource context handler.
043        * @param logger the assigned logging channel
044        * @param context the deployment context
045        * @exception Exception if an instantiation error occurs
046        */
047        public ResourceContextHandler( Logger logger, Context context ) throws Exception
048        {
049            ContextHelper helper = new ContextHelper( logger );
050            helper.contextualize( this, context );
051            
052            String base = context.getResourceBase();
053            super.setResourceBase( base );
054            logger.debug( "resource path: " + base );
055            
056            ResourceHandler handler = new ResourceHandler( "static", "/" );
057            super.setHandler( handler );
058        }
059    }