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    
015    package org.apache.tapestry5.internal.services;
016    
017    import java.io.IOException;
018    
019    import org.apache.tapestry5.EventContext;
020    import org.apache.tapestry5.internal.EmptyEventContext;
021    import org.apache.tapestry5.internal.InternalConstants;
022    import org.apache.tapestry5.ioc.annotations.Inject;
023    import org.apache.tapestry5.ioc.services.TypeCoercer;
024    import org.apache.tapestry5.services.ComponentClassResolver;
025    import org.apache.tapestry5.services.ComponentEventResultProcessor;
026    import org.apache.tapestry5.services.PageRenderRequestHandler;
027    import org.apache.tapestry5.services.PageRenderRequestParameters;
028    import org.apache.tapestry5.services.Request;
029    import 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     */
037    public 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    }