    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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.EventConstants;
    018import org.apache.tapestry5.http.Link;
    019import org.apache.tapestry5.model.ComponentModel;
    020import org.apache.tapestry5.runtime.Component;
    021import org.apache.tapestry5.services.ComponentClassResolver;
    022import org.apache.tapestry5.services.ComponentEventRequestParameters;
    023import org.apache.tapestry5.services.ComponentSource;
    024import org.apache.tapestry5.services.LinkCreationListener2;
    025import 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 */
    033public 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}