    001// Copyright 2010-2014 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.EventContext;
    018import org.apache.tapestry5.TapestryConstants;
    019import org.apache.tapestry5.beanmodel.services.*;
    020import org.apache.tapestry5.commons.services.TypeCoercer;
    021import org.apache.tapestry5.http.services.Request;
    022import org.apache.tapestry5.http.services.RequestGlobals;
    023import org.apache.tapestry5.internal.EmptyEventContext;
    024import org.apache.tapestry5.internal.InternalConstants;
    025import org.apache.tapestry5.ioc.IOOperation;
    026import org.apache.tapestry5.services.ComponentClassResolver;
    027import org.apache.tapestry5.services.ComponentEventResultProcessor;
    028import org.apache.tapestry5.services.PageRenderRequestHandler;
    029import org.apache.tapestry5.services.PageRenderRequestParameters;
    030import org.apache.tapestry5.services.StreamPageContent;
    031
    032import java.io.IOException;
    033
    034/**
    035 * Used to trigger the rendering of a particular page without causing a redirect to that page.
    036 * The content of the page is just streamed to the client.
    037 *
    038 * @since 5.2.0
    039 */
    040public class StreamPageContentResultProcessor implements ComponentEventResultProcessor<StreamPageContent>
    041{
    042    private final PageRenderRequestHandler handler;
    043
    044    private final ComponentClassResolver resolver;
    045
    046    private final TypeCoercer typeCoercer;
    047
    048    private final RequestGlobals requestGlobals;
    049
    050    private final Request request;
    051
    052    public StreamPageContentResultProcessor(PageRenderRequestHandler handler, ComponentClassResolver resolver, TypeCoercer typeCoercer, RequestGlobals requestGlobals, Request request)
    053    {
    054        this.handler = handler;
    055        this.resolver = resolver;
    056        this.typeCoercer = typeCoercer;
    057        this.requestGlobals = requestGlobals;
    058        this.request = request;
    059    }
    060
    061    public void processResultValue(StreamPageContent value) throws IOException
    062    {
    063        Class<?> pageClass = value.getPageClass();
    064        Object[] activationContext = value.getPageActivationContext();
    065
    066        final String pageName = pageClass == null
    067                ? requestGlobals.getActivePageName()
    068                : resolver.resolvePageClassNameToPageName(pageClass.getName());
    069
    070        final EventContext context = activationContext == null
    071                ? new EmptyEventContext()
    072                : new ArrayEventContext(typeCoercer, activationContext);
    073
    074        if (value.isBypassActivation())
    075        {
    076            request.setAttribute(InternalConstants.BYPASS_ACTIVATION, true);
    077        }
    078
    079        request.setAttribute(TapestryConstants.RESPONSE_RENDERER, new IOOperation<Void>()
    080        {
    081            public Void perform() throws IOException
    082            {
    083                handler.handle(new PageRenderRequestParameters(pageName, context, false));
    084
    085                return null;
    086            }
    087        });
    088    }
    089}