1 /*
2 * Copyright 2001,2004 The Apache Software Foundation.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.apache.commons.scaffold.lang;
18
19 import org.apache.commons.scaffold.text.ConvertUtils;
20
21
22 /**
23 * Mimicks new functionality in 1.4
24 * http://www.javaworld.com/javaworld/jw-08-2001/jw-0803-exceptions.html
25 * @author Brian Geotz
26 * @version $Revision: 155464 $ $Date: 2005-02-26 13:26:54 +0000 (Sat, 26 Feb 2005) $
27 */
28 public class ChainedException extends Exception {
29
30 private static final String CAUSED_BY = "Caused by: ";
31
32 private Throwable cause;
33
34 public ChainedException() {
35 super();
36 }
37
38 public ChainedException(String message) {
39 super(message);
40 }
41
42 public ChainedException(String message, Throwable cause) {
43 super(message);
44 this.cause = cause;
45 }
46
47 public ChainedException(Throwable cause) {
48 super();
49 this.cause = cause;
50 }
51
52 public Throwable getCause() {
53 return this.cause;
54 }
55
56 public boolean isCause() {
57 return (this.cause!=null);
58 }
59
60 public String getCauseMessage() {
61 if (this.cause==null)
62 return null;
63 return this.cause.getMessage();
64 }
65
66 public void getMessage(StringBuffer sb) {
67 sb.append(super.getMessage());
68 sb.append(ConvertUtils.LINE_FEED);
69 if (cause != null) {
70 sb.append(CAUSED_BY);
71 if (cause instanceof ChainedException) {
72 ChainedException chainedCause = (ChainedException) cause;
73 chainedCause.getMessage(sb);
74 }
75 else {
76 sb.append(cause.getMessage());
77 }
78 }
79 }
80
81 public void printStackTrace() {
82 super.printStackTrace();
83 if (cause != null) {
84 System.err.println(CAUSED_BY);
85 cause.printStackTrace();
86 }
87 }
88
89 public void printStackTrace(java.io.PrintStream ps) {
90 super.printStackTrace(ps);
91 if (cause != null) {
92 ps.println(CAUSED_BY);
93 cause.printStackTrace(ps);
94 }
95 }
96
97 public void printStackTrace(java.io.PrintWriter pw) {
98 super.printStackTrace(pw);
99 if (cause != null) {
100 pw.println(CAUSED_BY);
101 cause.printStackTrace(pw);
102 }
103 }
104 }
105