1 package org.drools;
2
3 /*
4 $Id: DroolsException.java,v 1.10 2002/08/23 17:57:40 bob Exp $
5
6 Copyright 2002 (C) The Werken Company. All Rights Reserved.
7
8 Redistribution and use of this software and associated documentation
9 ("Software"), with or without modification, are permitted provided
10 that the following conditions are met:
11
12 1. Redistributions of source code must retain copyright
13 statements and notices. Redistributions must also contain a
14 copy of this document.
15
16 2. Redistributions in binary form must reproduce the
17 above copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
20
21 3. The name "drools" must not be used to endorse or promote
22 products derived from this Software without prior written
23 permission of The Werken Company. For written permission,
24 please contact bob@werken.com.
25
26 4. Products derived from this Software may not be called "drools"
27 nor may "drools" appear in their names without prior written
28 permission of The Werken Company. "drools" is a registered
29 trademark of The Werken Company.
30
31 5. Due credit should be given to The Werken Company.
32 (http://drools.werken.com/).
33
34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
45 OF THE POSSIBILITY OF SUCH DAMAGE.
46
47 */
48
49 import java.io.PrintStream;
50 import java.io.PrintWriter;
51
52 /*** Base <code>drools Logic Engine</code> exception.
53 *
54 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
55 *
56 * @version $Id: DroolsException.java,v 1.10 2002/08/23 17:57:40 bob Exp $
57 */
58 public class DroolsException extends Exception
59 {
60 // ------------------------------------------------------------
61 // Instance members
62 // ------------------------------------------------------------
63
64 /*** Root cause, if any. */
65 private Throwable rootCause;
66
67 // ------------------------------------------------------------
68 // Constructors
69 // ------------------------------------------------------------
70
71 /*** Construct.
72 */
73 public DroolsException()
74 {
75 }
76
77 /*** Construct with a message.
78 *
79 * @param msg The message.
80 */
81 public DroolsException(String msg)
82 {
83 super( msg );
84 }
85
86 /*** Construct with a root cause.
87 *
88 * @param rootCause The root cause of this exception.
89 */
90 public DroolsException(Throwable rootCause)
91 {
92 this.rootCause = rootCause;
93 }
94
95 // ------------------------------------------------------------
96 // Instance methods
97 // ------------------------------------------------------------
98
99 /*** Get the root cause, if any.
100 *
101 * @return The root cause of this exception, as a
102 * <code>Throwable</code>, if this exception
103 * has a root cause, else <code>null</code>.
104 */
105 public Throwable getRootCause()
106 {
107 return this.rootCause;
108 }
109
110 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
111 // java.lang.Exception
112 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
113
114 /*** Retrieve the error message.
115 *
116 * @return The error message.
117 */
118 public String getMessage()
119 {
120 Throwable rootCause = getRootCause();
121
122 if ( rootCause == null )
123 {
124 return super.getMessage();
125 }
126
127 StringBuffer msg = new StringBuffer();
128
129 msg.append( super.getMessage() );
130
131 msg.append( " : " );
132
133 msg.append( rootCause.getMessage() );
134
135 return msg.toString();
136 }
137
138 /*** Retrieve the error message localized
139 * to the default locale.
140 *
141 * @return The error message.
142 */
143 public String getLocalizedMessage()
144 {
145 Throwable rootCause = getRootCause();
146
147 if ( rootCause == null )
148 {
149 return super.getMessage();
150 }
151
152 StringBuffer msg = new StringBuffer();
153
154 msg.append( super.getLocalizedMessage() );
155
156 msg.append( " : " );
157
158 msg.append( rootCause.getLocalizedMessage() );
159
160 return msg.toString();
161 }
162
163 /*** Print the stack trace.
164 *
165 * @param s The output sink.
166 */
167 public void printStackTrace(PrintStream s)
168 {
169 super.printStackTrace( s );
170
171 Throwable rootCause = getRootCause();
172
173 if ( rootCause != null )
174 {
175 System.err.println( "Nested exception was: " );
176 rootCause.printStackTrace( s );
177 }
178 }
179
180 /*** Print the stack trace.
181 *
182 * @param s The output sink.
183 */
184 public void printStackTrace(PrintWriter s)
185 {
186 super.printStackTrace( s );
187
188 Throwable rootCause = getRootCause();
189
190 if ( rootCause != null )
191 {
192 System.err.println( "Nested exception was: " );
193 rootCause.printStackTrace( s );
194 }
195 }
196 }
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