    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    }