    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    }