1 /*
2 * $Source: /usr/cvsroot/melati/melati/src/main/java/org/melati/template/velocity/PassbackEvaluationExceptionHandler.java,v $
3 * $Revision: 1.2 $
4 *
5 * Copyright (C) 2008 Tim Pizey
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * Tim Pizey <timp At paneris.org>
42 * http://paneris.org/~timp
43 */
44
45 package org.melati.template.velocity;
46
47
48 import org.apache.velocity.VelocityContext;
49 import org.apache.velocity.app.event.MethodExceptionEventHandler;
50 import org.melati.template.MarkupLanguage;
51 import org.webmacro.PropertyException;
52
53 /**
54 * @author timp
55 * @since 1 Apr 2008
56 *
57 */
58 public class PassbackEvaluationExceptionHandler
59 extends PropagateEvaluationExceptionHandler
60 implements MethodExceptionEventHandler {
61
62 /** The webcontext. */
63 private VelocityContext velContext;
64
65 /**
66 * Constructor.
67 */
68 public PassbackEvaluationExceptionHandler(VelocityContext vc) {
69 super();
70 velContext = vc;
71 }
72
73 @SuppressWarnings("unchecked")
74 @Override
75 public Object methodException(Class claz, String method, Exception problem) throws Exception {
76 System.err.println(method + " " + problem);
77 MarkupLanguage ml = (MarkupLanguage)velContext.get("ml");
78 if (ml == null) throw new PropertyException(
79 "Error, to use the Passback Evaluation Exception Handler, you must " +
80 "place your MarkupLanguage in the context as $ml - " +
81 method + ": " + problem, problem);
82 Throwable underlying = problem;
83 return ml.rendered(underlying);
84 }
85
86
87 }