1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/saxpath/SAXPathException.java,v 1.12 2005/09/24 11:46:45 elharo Exp $
3 * $Revision: 1.12 $
4 * $Date: 2005/09/24 11:46:45 $
5 *
6 * ====================================================================
7 *
8 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions, and the disclaimer that follows
20 * these conditions in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * 3. The name "Jaxen" must not be used to endorse or promote products
24 * derived from this software without prior written permission. For
25 * written permission, please contact license@jaxen.org.
26 *
27 * 4. Products derived from this software may not be called "Jaxen", nor
28 * may "Jaxen" appear in their name, without prior written permission
29 * from the Jaxen Project Management (pm@jaxen.org).
30 *
31 * In addition, we request (but do not require) that you include in the
32 * end-user documentation provided with the redistribution and/or in the
33 * software itself an acknowledgement equivalent to the following:
34 * "This product includes software developed by the
35 * Jaxen Project <http://www.jaxen.org/>."
36 * Alternatively, the acknowledgment may be graphical using the logos
37 * available at http://www.jaxen.org/
38 *
39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * ====================================================================
53 * This software consists of voluntary contributions made by many
54 * individuals on behalf of the Jaxen Project and was originally
55 * created by bob mcwhirter <bob@werken.com> and
56 * James Strachan <jstrachan@apache.org>. For more information on the
57 * Jaxen Project, please see <http://www.jaxen.org/>.
58 *
59 * $Id: SAXPathException.java,v 1.12 2005/09/24 11:46:45 elharo Exp $
60 */
61
62 package org.jaxen.saxpath;
63
64 import java.io.PrintStream;
65 import java.io.PrintWriter;
66
67 /*** Base of all SAXPath exceptions.
68 *
69 * @author bob mcwhirter (bob@werken.com)
70 */
71 public class SAXPathException extends Exception
72 {
73
74 private static double javaVersion = 1.4;
75
76 static {
77 try {
78 String versionString = System.getProperty("java.version");
79 versionString = versionString.substring(0, 3);
80 javaVersion = Double.valueOf(versionString).doubleValue();
81 }
82 catch (Exception ex) {
83 // The version string format changed so presumably it's
84 // 1.4 or later.
85 }
86 }
87
88 /*** Create a new SAXPathException with a given message.
89 *
90 * @param message the error message
91 */
92 public SAXPathException(String message)
93 {
94 super( message );
95 }
96
97 /*** Create a new SAXPathException based on another exception
98 *
99 * @param cause the error source
100 */
101 public SAXPathException(Throwable cause)
102 {
103 super ( cause.getMessage() );
104 initCause(cause);
105 }
106
107 /***
108 * Create a new SAXPathException with the specified detail message
109 * and root cause.
110 *
111 * @param message the detail message
112 * @param cause the cause of this exception
113 */
114 public SAXPathException(String message, Throwable cause) {
115 super( message );
116 initCause(cause);
117 }
118
119
120 private Throwable cause;
121 private boolean causeSet = false;
122
123 /***
124 * Returns the exception that caused this exception.
125 * This is necessary to implement Java 1.4 chained exception
126 * functionality in a Java 1.3-compatible way.
127 *
128 * @return the exception that caused this exception
129 */
130 public Throwable getCause() {
131 return cause;
132 }
133
134
135 /***
136 * Sets the exception that caused this exception.
137 * This is necessary to implement Java 1.4 chained exception
138 * functionality in a Java 1.3-compatible way.
139 *
140 * @param cause the exception wrapped in this runtime exception
141 *
142 * @return this exception
143 */
144 public Throwable initCause(Throwable cause) {
145 if (causeSet) throw new IllegalStateException("Cause cannot be reset");
146 if (cause == this) throw new IllegalArgumentException("Exception cannot be its own cause");
147 causeSet = true;
148 this.cause = cause;
149 return this;
150 }
151
152 /*** Print this exception's stack trace, followed by the
153 * source exception's trace, if any.
154 *
155 * @param s the stream on which to print the stack trace
156 */
157 public void printStackTrace ( PrintStream s )
158 {
159 super.printStackTrace ( s );
160 if (javaVersion < 1.4 && getCause() != null) {
161 s.print( "Caused by: " );
162 getCause().printStackTrace( s );
163 }
164 }
165
166 /*** Print this exception's stack trace, followed by the
167 * source exception's stack trace, if any.
168 *
169 * @param s the writer on which to print the stack trace
170 */
171 public void printStackTrace ( PrintWriter s )
172 {
173 super.printStackTrace( s );
174 if (javaVersion < 1.4 && getCause() != null) {
175 s.print( "Caused by: " );
176 getCause().printStackTrace( s );
177 }
178 }
179
180 }