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 javax.portlet.ActionRequest;
018    import javax.portlet.ActionResponse;
019    
020    import org.apache.hivemind.ApplicationRuntimeException;
021    import org.apache.tapestry.IRequestCycle;
022    import org.apache.tapestry.StaleLinkException;
023    import org.apache.tapestry.error.RequestExceptionReporter;
024    import org.apache.tapestry.error.StaleLinkExceptionPresenter;
025    import org.apache.tapestry.services.ServiceConstants;
026    
027    /**
028     * Implementation of {@link org.apache.tapestry.error.StaleLinkExceptionPresenter} for Portlets.
029     * 
030     * @author Howard M. Lewis Ship
031     * @since 4.0
032     */
033    public class PortletStaleLinkExceptionPresenter implements StaleLinkExceptionPresenter
034    {
035        private PortletRequestGlobals _globals;
036    
037        private RequestExceptionReporter _requestExceptionReporter;
038    
039        public void presentStaleLinkException(IRequestCycle cycle, StaleLinkException cause)
040        {
041            try
042            {
043                ActionRequest request = _globals.getActionRequest();
044    
045                request.getPortletSession(true).setAttribute(
046                        PortletConstants.PORTLET_EXCEPTION_MARKUP_ATTRIBUTE,
047                        cause.getMessage());
048    
049                ActionResponse response = _globals.getActionResponse();
050    
051                response.setRenderParameter(
052                        ServiceConstants.SERVICE,
053                        PortletConstants.EXCEPTION_SERVICE);
054            }
055            catch (Exception ex)
056            {
057                // Worst case scenario. The exception page itself is broken, leaving
058                // us with no option but to write the cause to the output.
059    
060                // Also, write the exception thrown when redendering the exception
061                // page, so that can get fixed as well.
062    
063                _requestExceptionReporter.reportRequestException(PortletMessages
064                        .errorReportingException(ex), ex);
065    
066                // And throw the exception.
067    
068                throw new ApplicationRuntimeException(ex.getMessage(), ex);
069            }
070        }
071    
072        public void setGlobals(PortletRequestGlobals globals)
073        {
074            _globals = globals;
075        }
076    
077        public void setRequestExceptionReporter(RequestExceptionReporter requestExceptionReporter)
078        {
079            _requestExceptionReporter = requestExceptionReporter;
080        }
081    
082    }