001// Copyright 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 java.io.IOException;
018
019import org.apache.tapestry5.EventContext;
020import org.apache.tapestry5.internal.EmptyEventContext;
021import org.apache.tapestry5.internal.InternalConstants;
022import org.apache.tapestry5.ioc.annotations.Inject;
023import org.apache.tapestry5.ioc.services.TypeCoercer;
024import org.apache.tapestry5.services.ComponentClassResolver;
025import org.apache.tapestry5.services.ComponentEventResultProcessor;
026import org.apache.tapestry5.services.PageRenderRequestHandler;
027import org.apache.tapestry5.services.PageRenderRequestParameters;
028import org.apache.tapestry5.services.Request;
029import org.apache.tapestry5.services.StreamPageContent;
030
031/**
032 * Used to trigger the rendering of a particular page without causing a redirect to that page.
033 * The content of the page is just streamed to the client.
034 * 
035 * @since 5.2.0
036 */
037public class StreamPageContentResultProcessor implements ComponentEventResultProcessor<StreamPageContent>
038{
039    private final PageRenderRequestHandler handler;
040
041    private final ComponentClassResolver resolver;
042
043    private final TypeCoercer typeCoercer;
044
045    public StreamPageContentResultProcessor(PageRenderRequestHandler handler, ComponentClassResolver resolver, TypeCoercer typeCoercer)
046    {
047        this.handler = handler;
048        this.resolver = resolver;
049        this.typeCoercer = typeCoercer;
050    }
051
052    public void processResultValue(final StreamPageContent value) throws IOException
053    {
054
055        final Class<?> pageClass = value.getPageClass();
056        final Object[] activationContext = value.getPageActivationContext();
057
058        final String pageName = this.resolver.resolvePageClassNameToPageName(pageClass.getName());
059
060        final EventContext context = activationContext == null ? new EmptyEventContext() : new ArrayEventContext(
061                this.typeCoercer, activationContext);
062
063        this.handler.handle(new PageRenderRequestParameters(pageName, context, false));
064    }
065}