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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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