001    // Copyright 2010 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.EventConstants;
018    import org.apache.tapestry5.Link;
019    import org.apache.tapestry5.model.ComponentModel;
020    import org.apache.tapestry5.runtime.Component;
021    import org.apache.tapestry5.services.ComponentClassResolver;
022    import org.apache.tapestry5.services.ComponentEventRequestParameters;
023    import org.apache.tapestry5.services.ComponentSource;
024    import org.apache.tapestry5.services.LinkCreationListener2;
025    import org.apache.tapestry5.services.PageRenderRequestParameters;
026    
027    /**
028     * A default {@link LinkCreationListener2} that triggers the {@link EventConstants#DECORATE_COMPONENT_EVENT_LINK} and
029     * {@link EventConstants#DECORATE_PAGE_RENDER_LINK} events as links are generated.
030     * 
031     * @since 5.2.0
032     */
033    public class LinkDecorationListener implements LinkCreationListener2
034    {
035        private final ComponentClassResolver resolver;
036    
037        private final ComponentSource componentSource;
038    
039        private final ComponentModelSource modelSource;
040    
041        public LinkDecorationListener(ComponentClassResolver resolver, ComponentSource componentSource,
042                ComponentModelSource modelSource)
043        {
044            this.resolver = resolver;
045            this.componentSource = componentSource;
046            this.modelSource = modelSource;
047        }
048    
049        public void createdComponentEventLink(Link link, ComponentEventRequestParameters parameters)
050        {
051            trigger(parameters.getActivePageName(), EventConstants.DECORATE_COMPONENT_EVENT_LINK, link, parameters);
052        }
053    
054        public void createdPageRenderLink(Link link, PageRenderRequestParameters parameters)
055        {
056            trigger(parameters.getLogicalPageName(), EventConstants.DECORATE_PAGE_RENDER_LINK, link, parameters);
057        }
058    
059        private void trigger(String pageName, String eventType, Link link, Object parameters)
060        {
061            String pageClassName = resolver.resolvePageNameToClassName(pageName);
062    
063            ComponentModel model = modelSource.getModel(pageClassName);
064    
065            if (model.handlesEvent(eventType))
066            {
067                Component page = componentSource.getPage(pageName);
068    
069                page.getComponentResources().triggerEvent(eventType, new Object[]
070                { link, parameters }, null);
071            }
072        }
073    }