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Java > Open Source Codes > org > apache > tapestry > error > ExceptionPresenterImpl


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.error;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.tapestry.IPage;
19 import org.apache.tapestry.IRequestCycle;
20 import org.apache.tapestry.services.ResponseRenderer;
21
22 /**
23  * @author Howard M. Lewis Ship
24  * @since 4.0
25  */
26 public class ExceptionPresenterImpl implements ExceptionPresenter
27 {
28     private RequestExceptionReporter _requestExceptionReporter;
29
30     private ResponseRenderer _responseRenderer;
31
32     private String JavaDoc _exceptionPageName;
33
34     private boolean _verbose;
35
36     public void presentException(IRequestCycle cycle, Throwable JavaDoc cause)
37     {
38         try
39         {
40             IPage exceptionPage = cycle.getPage(_exceptionPageName);
41
42             exceptionPage.setProperty("exception", cause);
43
44             cycle.activate(exceptionPage);
45
46             _responseRenderer.renderResponse(cycle);
47         }
48         catch (Throwable JavaDoc ex)
49         {
50             // Worst case scenario. The exception page itself is broken, leaving
51 // us with no option but to write the cause to the output.
52
53             _requestExceptionReporter.reportRequestException(ErrorMessages
54                     .unableToProcessClientRequest(cause), cause);
55
56             // Also, write the exception thrown when redendering the exception
57 // page, so that can get fixed as well.
58
59             _requestExceptionReporter.reportRequestException(ErrorMessages
60                     .unableToPresentExceptionPage(ex), ex);
61
62             // And throw the exception.
63
64             throw new ApplicationRuntimeException(ex.getMessage(), ex);
65         }
66
67         if (_verbose)
68             _requestExceptionReporter.reportRequestException(ErrorMessages
69                     .unableToProcessClientRequest(cause), cause);
70     }
71
72     public void setExceptionPageName(String JavaDoc exceptionPageName)
73     {
74         _exceptionPageName = exceptionPageName;
75     }
76
77     public void setRequestExceptionReporter(RequestExceptionReporter requestExceptionReporter)
78     {
79         _requestExceptionReporter = requestExceptionReporter;
80     }
81
82     public void setResponseRenderer(ResponseRenderer responseRenderer)
83     {
84         _responseRenderer = responseRenderer;
85     }
86
87     public boolean isVerbose()
88     {
89         return _verbose;
90     }
91
92     public void setVerbose(boolean verbose)
93     {
94         _verbose = verbose;
95     }
96 }
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