001    // Copyright 2004, 2005 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.tapestry.engine;
016    
017    import java.io.IOException;
018    import java.util.HashMap;
019    import java.util.Map;
020    
021    import org.apache.tapestry.IRequestCycle;
022    import org.apache.tapestry.Tapestry;
023    import org.apache.tapestry.services.LinkFactory;
024    import org.apache.tapestry.services.ResponseRenderer;
025    import org.apache.tapestry.services.ServiceConstants;
026    
027    /**
028     * An implementation of the home service that renders the Home page. This is the most likely
029     * candidate for overriding ... for example, to select the page to render based on known information
030     * about the user (stored as a cookie).
031     * 
032     * @author Howard Lewis Ship
033     * @since 1.0.9
034     */
035    
036    public class HomeService implements IEngineService
037    {
038        /** @since 4.0 */
039        private ResponseRenderer _responseRenderer;
040    
041        /** @since 4.0 */
042    
043        private LinkFactory _linkFactory;
044    
045        /** @since 4.0 */
046    
047        private String _pageName;
048    
049        public ILink getLink(boolean post, Object parameter)
050        {
051            if (parameter != null)
052                throw new IllegalArgumentException(EngineMessages.serviceNoParameter(this));
053    
054            Map parameters = new HashMap();
055    
056            parameters.put(ServiceConstants.SERVICE, getName());
057    
058            return _linkFactory.constructLink(this, post, parameters, true);
059        }
060    
061        public void service(IRequestCycle cycle) throws IOException
062        {
063            cycle.activate(_pageName);
064    
065            _responseRenderer.renderResponse(cycle);
066        }
067    
068        public String getName()
069        {
070            return Tapestry.HOME_SERVICE;
071        }
072    
073        /** @since 4.0 */
074        public void setResponseRenderer(ResponseRenderer responseRenderer)
075        {
076            _responseRenderer = responseRenderer;
077        }
078    
079        /** @since 4.0 */
080        public void setLinkFactory(LinkFactory linkFactory)
081        {
082            _linkFactory = linkFactory;
083        }
084    
085        /** @since 4.0 */
086        public void setPageName(String pageName)
087        {
088            _pageName = pageName;
089        }
090    
091        /** @since 4.0 */
092        public String getPageName()
093        {
094            return _pageName;
095        }
096    }