    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    }