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
029     * most likely candidate for overriding ... for example, to select the page to
030     * render based on known information 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    
039        /** @since 4.0 */
040        private ResponseRenderer _responseRenderer;
041    
042        /** @since 4.0 */
043    
044        private LinkFactory _linkFactory;
045    
046        /** @since 4.0 */
047    
048        private String _pageName;
049    
050        public ILink getLink(boolean post, Object parameter)
051        {
052            if (parameter != null)
053                throw new IllegalArgumentException(EngineMessages
054                        .serviceNoParameter(this));
055    
056            Map parameters = new HashMap();
057    
058            parameters.put(ServiceConstants.SERVICE, getName());
059    
060            return _linkFactory.constructLink(this, post, parameters, true);
061        }
062    
063        public void service(IRequestCycle cycle)
064            throws IOException
065        {
066            cycle.activate(_pageName);
067    
068            _responseRenderer.renderResponse(cycle);
069        }
070    
071        public String getName()
072        {
073            return Tapestry.HOME_SERVICE;
074        }
075    
076        /** @since 4.0 */
077        public void setResponseRenderer(ResponseRenderer responseRenderer)
078        {
079            _responseRenderer = responseRenderer;
080        }
081    
082        /** @since 4.0 */
083        public void setLinkFactory(LinkFactory linkFactory)
084        {
085            _linkFactory = linkFactory;
086        }
087    
088        /** @since 4.0 */
089        public void setPageName(String pageName)
090        {
091            _pageName = pageName;
092        }
093    
094        /** @since 4.0 */
095        public String getPageName()
096        {
097            return _pageName;
098        }
099    }