    001// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.internal.InternalConstants;
    018import org.apache.tapestry5.internal.structure.Page;
    019import org.apache.tapestry5.ioc.annotations.Primary;
    020import org.apache.tapestry5.services.*;
    021
    022import java.io.IOException;
    023
    024/**
    025 * Handles a page render request by activating and then rendering the page.
    026 *
    027 * @see org.apache.tapestry5.internal.services.PageRenderDispatcher
    028 */
    029@SuppressWarnings("unchecked")
    030public class PageRenderRequestHandlerImpl implements PageRenderRequestHandler
    031{
    032    private final RequestPageCache cache;
    033
    034    private final ComponentEventResultProcessor resultProcessor;
    035
    036    private final PageResponseRenderer pageResponseRenderer;
    037
    038    private final PageActivator pageActivator;
    039
    040    private final Request request;
    041
    042    public PageRenderRequestHandlerImpl(RequestPageCache cache, @Traditional
    043    @Primary
    044    ComponentEventResultProcessor resultProcessor, PageResponseRenderer pageResponseRenderer,
    045                                        PageActivator pageActivator, Request request)
    046    {
    047        this.cache = cache;
    048        this.resultProcessor = resultProcessor;
    049        this.pageResponseRenderer = pageResponseRenderer;
    050        this.pageActivator = pageActivator;
    051        this.request = request;
    052    }
    053
    054    public void handle(PageRenderRequestParameters parameters) throws IOException
    055    {
    056        Page page = cache.get(parameters.getLogicalPageName());
    057
    058        if (request.getAttribute(InternalConstants.BYPASS_ACTIVATION) == null)
    059        {
    060            if (pageActivator.activatePage(page.getRootElement().getComponentResources(),
    061                    parameters.getActivationContext(), resultProcessor))
    062            {
    063                return;
    064            }
    065
    066            if (!parameters.isLoopback())
    067            {
    068                page.pageReset();
    069            }
    070        }
    071
    072        pageResponseRenderer.renderPageResponse(page);
    073    }
    074}