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    
019    import javax.portlet.ActionRequest;
020    import javax.portlet.ActionResponse;
021    
022    import org.apache.tapestry.IRequestCycle;
023    import org.apache.tapestry.StaleLinkException;
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        public void presentStaleLinkException(IRequestCycle cycle, StaleLinkException cause)
038                throws IOException
039        {
040            ActionRequest request = _globals.getActionRequest();
041    
042            request.getPortletSession(true).setAttribute(
043                    PortletConstants.PORTLET_EXCEPTION_MARKUP_ATTRIBUTE,
044                    cause.getMessage());
045    
046            ActionResponse response = _globals.getActionResponse();
047    
048            response.setRenderParameter(ServiceConstants.SERVICE, PortletConstants.EXCEPTION_SERVICE);
049        }
050    
051        public void setGlobals(PortletRequestGlobals globals)
052        {
053            _globals = globals;
054        }
055    }