001    // Copyright 2006, 2007, 2008, 2009, 2010 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 java.io.IOException;
018    
019    import org.apache.tapestry5.internal.structure.Page;
020    import org.apache.tapestry5.ioc.annotations.Primary;
021    import org.apache.tapestry5.services.ComponentEventResultProcessor;
022    import org.apache.tapestry5.services.PageRenderRequestHandler;
023    import org.apache.tapestry5.services.PageRenderRequestParameters;
024    import org.apache.tapestry5.services.Traditional;
025    
026    /**
027     * Handles a page render request by activating and then rendering the page.
028     * 
029     * @see org.apache.tapestry5.internal.services.PageRenderDispatcher
030     */
031    @SuppressWarnings("unchecked")
032    public class PageRenderRequestHandlerImpl implements PageRenderRequestHandler
033    {
034        private final RequestPageCache cache;
035    
036        private final ComponentEventResultProcessor resultProcessor;
037    
038        private final PageResponseRenderer pageResponseRenderer;
039    
040        private final PageActivator pageActivator;
041    
042        public PageRenderRequestHandlerImpl(RequestPageCache cache, @Traditional
043        @Primary
044        ComponentEventResultProcessor resultProcessor, PageResponseRenderer pageResponseRenderer,
045                PageActivator pageActivator)
046        {
047            this.cache = cache;
048            this.resultProcessor = resultProcessor;
049            this.pageResponseRenderer = pageResponseRenderer;
050            this.pageActivator = pageActivator;
051        }
052    
053        public void handle(PageRenderRequestParameters parameters) throws IOException
054        {
055            Page page = cache.get(parameters.getLogicalPageName());
056    
057            if (pageActivator.activatePage(page.getRootElement().getComponentResources(),
058                    parameters.getActivationContext(), resultProcessor))
059                return;
060    
061            if (!parameters.isLoopback())
062                page.pageReset();
063    
064            pageResponseRenderer.renderPageResponse(page);
065        }
066    }