001    // Copyright 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.portlet;
016    
017    import java.io.IOException;
018    import java.io.PrintWriter;
019    
020    import javax.portlet.PortletURL;
021    
022    import org.apache.tapestry.IRequestCycle;
023    import org.apache.tapestry.engine.IEngineService;
024    import org.apache.tapestry.engine.ILink;
025    import org.apache.tapestry.util.ContentType;
026    import org.apache.tapestry.web.WebRequest;
027    import org.apache.tapestry.web.WebResponse;
028    import org.apache.tapestry.web.WebSession;
029    
030    /**
031     * @author Howard M. Lewis Ship
032     * @since 4.0
033     * @see org.apache.tapestry.portlet.PortletConstants#PORTLET_EXCEPTION_MARKUP_ATTRIBUTE
034     */
035    public class ExceptionService implements IEngineService
036    {
037        private WebRequest _request;
038    
039        private WebResponse _response;
040    
041        private PortletRequestGlobals _globals;
042    
043        public ILink getLink(boolean post, Object parameter)
044        {
045            throw new UnsupportedOperationException(PortletMessages.unsupportedMethod("getLink"));
046        }
047    
048        public void service(IRequestCycle cycle) throws IOException
049        {
050            WebSession session = _request.getSession(true);
051            String markup = (String) session
052                    .getAttribute(PortletConstants.PORTLET_EXCEPTION_MARKUP_ATTRIBUTE);
053    
054            PrintWriter writer = _response.getPrintWriter(new ContentType("text/html"));
055    
056            PortletURL url = _globals.getRenderResponse().createActionURL();
057    
058            writer.println("<span class=\"portlet-msg-error\">An exception has occured.</span>");
059            writer.println("<br/>");
060            writer.println("<a href=\"" + url.toString() + "\">Click here to continue</a>");
061            writer.print("<br/><hr/>");
062            writer.println();
063    
064            writer.print(markup);
065        }
066    
067        public String getName()
068        {
069            return PortletConstants.EXCEPTION_SERVICE;
070        }
071    
072        public void setRequest(WebRequest request)
073        {
074            _request = request;
075        }
076    
077        public void setResponse(WebResponse response)
078        {
079            _response = response;
080        }
081    
082        public void setGlobals(PortletRequestGlobals globals)
083        {
084            _globals = globals;
085        }
086    }