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Java > Open Source Codes > org > apache > tapestry > html > ExceptionDisplay


1 // Copyright 2004, 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.html;
16
17 import org.apache.tapestry.BaseComponent;
18 import org.apache.tapestry.IMarkupWriter;
19 import org.apache.tapestry.IRequestCycle;
20 import org.apache.tapestry.bean.EvenOdd;
21 import org.apache.tapestry.util.exception.ExceptionDescription;
22
23 /**
24  * Component used to display an already formatted exception. [ <a
25  * HREF="../../../../../ComponentReference/ExceptionDisplay.html">Component Reference </a>]
26  *
27  * @author Howard Lewis Ship
28  */
29
30 public abstract class ExceptionDisplay extends BaseComponent
31 {
32     public abstract ExceptionDescription[] getExceptions();
33
34     private ExceptionDescription _exception;
35
36     private EvenOdd _evenOdd;
37
38     public abstract int getIndex();
39
40     public abstract int getCount();
41
42     public abstract void setCount(int count);
43
44     /**
45      * Each time the current exception is set, as a side effect, the evenOdd helper bean is reset to
46      * even.
47      */
48
49     public void setException(ExceptionDescription value)
50     {
51         _exception = value;
52
53         _evenOdd.setEven(true);
54     }
55
56     public ExceptionDescription getException()
57     {
58         return _exception;
59     }
60
61     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
62     {
63         ExceptionDescription[] exceptions = getExceptions();
64
65         setCount(exceptions.length);
66
67         try
68         {
69             _evenOdd = (EvenOdd) getBeans().getBean("evenOdd");
70
71             super.renderComponent(writer, cycle);
72         }
73         finally
74         {
75             _exception = null;
76             _evenOdd = null;
77         }
78     }
79
80     public boolean isLast()
81     {
82         return getIndex() == (getCount() - 1);
83     }
84 }
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