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