001    // Copyright 2006, 2007, 2008, 2009 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.tapestry5.internal.services;
016    
017    import org.apache.tapestry5.services.*;
018    
019    import java.io.IOException;
020    
021    /**
022     * Dispatches incoming requests for render requests. Render requests consist of either just a logical page name (case
023     * insensitive) or a logical page name plus additional context. Because of this structure, it take a little bit of work
024     * to identify the split point between the page name and the context.
025     */
026    public class PageRenderDispatcher implements Dispatcher
027    {
028        private final ComponentRequestHandler componentRequestHandler;
029    
030        private final ComponentEventLinkEncoder linkEncoder;
031    
032        public PageRenderDispatcher(ComponentRequestHandler componentRequestHandler, ComponentEventLinkEncoder linkEncoder)
033        {
034            this.componentRequestHandler = componentRequestHandler;
035            this.linkEncoder = linkEncoder;
036        }
037    
038        public boolean dispatch(Request request, final Response response) throws IOException
039        {
040    
041            PageRenderRequestParameters parameters = linkEncoder.decodePageRenderRequest(request);
042    
043            if (parameters == null) return false;
044    
045            componentRequestHandler.handlePageRender(parameters);
046    
047            return true;
048        }
049    }