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 }