    001    // Copyright 2006, 2007, 2008, 2009 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 org.apache.tapestry5.ComponentResources;
    018    import org.apache.tapestry5.internal.structure.Page;
    019    import org.apache.tapestry5.ioc.annotations.Marker;
    020    import org.apache.tapestry5.runtime.Component;
    021    import org.apache.tapestry5.services.ComponentEventResultProcessor;
    022    import org.apache.tapestry5.services.Traditional;
    023    import org.slf4j.Logger;
    024
    025    import java.io.IOException;
    026
    027    @Marker({Traditional.class, ComponentInstanceProcessor.class})
    028    public class ComponentInstanceResultProcessor implements ComponentEventResultProcessor<Component>
    029    {
    030        private final RequestPageCache requestPageCache;
    031
    032        private final Logger logger;
    033
    034        private final ActionRenderResponseGenerator generator;
    035
    036        public ComponentInstanceResultProcessor(Logger logger, RequestPageCache requestPageCache,
    037                                                ActionRenderResponseGenerator generator)
    038        {
    039            this.requestPageCache = requestPageCache;
    040            this.logger = logger;
    041            this.generator = generator;
    042        }
    043
    044        public void processResultValue(Component value) throws IOException
    045        {
    046            ComponentResources resources = value.getComponentResources();
    047
    048            if (resources.getContainer() != null)
    049                logger.warn(ServicesMessages.componentInstanceIsNotAPage(value));
    050
    051            // We have all these layers and layers between us and the page instance, but its easy to
    052            // extract the page class name and quickly re-resolve that to the page instance.
    053
    054            Page page = requestPageCache.get(resources.getPageName());
    055
    056            generator.generateResponse(page);
    057        }
    058    }