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
015package org.apache.tapestry.portlet;
016
017import java.io.IOException;
018import java.io.PrintWriter;
019
020import javax.portlet.PortletURL;
021
022import org.apache.tapestry.IRequestCycle;
023import org.apache.tapestry.engine.IEngineService;
024import org.apache.tapestry.engine.ILink;
025import org.apache.tapestry.util.ContentType;
026import org.apache.tapestry.web.WebRequest;
027import org.apache.tapestry.web.WebResponse;
028import 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 */
035public 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}