001    // Copyright 2006, 2007, 2008, 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 org.apache.tapestry5.MarkupWriter;
018    import org.apache.tapestry5.internal.structure.Page;
019    import org.apache.tapestry5.services.MarkupRenderer;
020    
021    public class PageMarkupRendererImpl implements PageMarkupRenderer
022    {
023        private final PageRenderQueue pageRenderQueue;
024    
025        private final MarkupRenderer markupRendererPipeline;
026    
027        public PageMarkupRendererImpl(MarkupRenderer markupRendererPipeline, PageRenderQueue pageRenderQueue)
028        {
029            // We have to go through some awkward tricks here:
030            // - MarkupRenderer and MarkupRendererFilter are PUBLIC
031            // - Page, PageMarkupRenderer, PageRenderQueue are PRIVATE
032            // - This service is the bridge between public and private
033    
034            this.pageRenderQueue = pageRenderQueue;
035    
036            this.markupRendererPipeline = markupRendererPipeline;
037        }
038    
039        public void renderPageMarkup(Page page, MarkupWriter writer)
040        {
041            // This is why the PRQ is scope perthread; we tell it what to render here ...
042    
043            pageRenderQueue.initializeForCompletePage(page);
044    
045            // ... then our statically fixed pipeline is able to (eventually) call into it.
046    
047            markupRendererPipeline.renderMarkup(writer);
048    
049            if (writer.getDocument().getRootElement() == null)
050                throw new RuntimeException(ServicesMessages.noMarkupFromPageRender(page));
051        }
052    }