KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > caucho > log > MessageFormatter


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.log;
30
31 import com.caucho.vfs.StringWriter;
32 import com.caucho.vfs.WriteStream;
33
34 import java.util.logging.Formatter JavaDoc;
35 import java.util.logging.LogRecord JavaDoc;
36
37 /**
38  * A simple formatter that handles localization, substitution of
39  * parameters, and the inclusion of an exception stack trace if applicable.
40  */
41 public class MessageFormatter extends Formatter JavaDoc {
42   public String JavaDoc format(LogRecord JavaDoc record)
43   {
44     return formatMessage(record);
45   }
46
47   /**
48    * The "formatted" log message, after localization, substitution of
49    * parameters, and the inclusion of an exception stack trace if applicable.
50    * <p>
51    * During formatting, if the source logger has a localization
52    * ResourceBundle and if that ResourceBundle has an entry for
53    * this message string, then the message string is replaced
54    * with the localized value.
55    * <p>
56    * If the message has parameters, java.text.MessageFormat is used to format
57    * the message with the parameters.
58    * <p>
59    * If the log record has an associated exception, the stack trace is
60    * appended to the log message.
61    *
62    * @see java.text.MessageFormat
63    * @see java.lang.Throwable.printStackTrace()
64    */
65   public String JavaDoc formatMessage(LogRecord JavaDoc record)
66   {
67     String JavaDoc message = super.formatMessage(record);
68     Throwable JavaDoc thrown = record.getThrown();
69
70     try {
71       if (thrown != null) {
72         StringWriter sw = new StringWriter();
73         WriteStream os = sw.openWrite();
74
75         if (message != null &&
76             ! message.equals(thrown.toString()) &&
77             ! message.equals(thrown.getMessage()))
78           os.println(message);
79
80     Throwable JavaDoc rootExn = thrown;
81
82     for (;
83          rootExn != null && rootExn.getCause() != null;
84          rootExn = rootExn.getCause()) {
85     }
86     
87         rootExn.printStackTrace(os.getPrintWriter());
88     
89         message = sw.getString();
90       }
91     } catch (Throwable JavaDoc e) {
92       e.printStackTrace();
93     }
94
95     return message;
96   }
97 }
98
99
Popular Tags