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Java > Open Source Codes > org > apache > commons > discovery > DiscoveryException


1 /*
2  * $Header$
3  * $Revision$
4  * $Date$
5  *
6  * ====================================================================
7  *
8  * The Apache Software License, Version 1.1
9  *
10  * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11  * reserved.
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13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
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17  * 1. Redistributions of source code must retain the above copyright
18  * notice, this list of conditions and the following disclaimer.
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20  * 2. Redistributions in binary form must reproduce the above copyright
21  * notice, this list of conditions and the following disclaimer in
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25  * 3. The end-user documentation included with the redistribution, if
26  * any, must include the following acknowlegement:
27  * "This product includes software developed by the
28  * Apache Software Foundation (http://www.apache.org/)."
29  * Alternately, this acknowlegement may appear in the software itself,
30  * if and wherever such third-party acknowlegements normally appear.
31  *
32  * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33  * Foundation" must not be used to endorse or promote products derived
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35  * permission, please contact apache@apache.org.
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39  * permission of the Apache Group.
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41  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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45  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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47  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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52  * SUCH DAMAGE.
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54  *
55  * This software consists of voluntary contributions made by many
56  * individuals on behalf of the Apache Software Foundation. For more
57  * information on the Apache Software Foundation, please see
58  * <http://www.apache.org/>.
59  *
60  */
61
62 package org.apache.commons.discovery;
63
64
65 /**
66  * <p>An exception that is thrown only if a suitable service
67  * instance cannot be created by <code>ServiceFactory</code></p>
68  *
69  * <p>Copied from LogConfigurationException<p>
70  *
71  * @author Craig R. McClanahan
72  * @version $Revision$ $Date$
73  */
74 public class DiscoveryException extends RuntimeException JavaDoc {
75
76
77     /**
78      * Construct a new exception with <code>null</code> as its detail message.
79      */
80     public DiscoveryException() {
81         super();
82     }
83
84     /**
85      * Construct a new exception with the specified detail message.
86      *
87      * @param message The detail message
88      */
89     public DiscoveryException(String JavaDoc message) {
90         super(message);
91     }
92
93     /**
94      * Construct a new exception with the specified cause and a derived
95      * detail message.
96      *
97      * @param cause The underlying cause
98      */
99     public DiscoveryException(Throwable JavaDoc cause) {
100         this((cause == null) ? null : cause.toString(), cause);
101     }
102
103     /**
104      * Construct a new exception with the specified detail message and cause.
105      *
106      * @param message The detail message
107      * @param cause The underlying cause
108      */
109     public DiscoveryException(String JavaDoc message, Throwable JavaDoc cause) {
110         super(message);
111         this.cause = cause; // Two-argument version requires JDK 1.4 or later
112 }
113
114     /**
115      * The underlying cause of this exception.
116      */
117     protected Throwable JavaDoc cause = null;
118
119     /**
120      * Return the underlying cause of this exception (if any).
121      */
122     public Throwable JavaDoc getCause() {
123         return this.cause;
124     }
125     
126     public String JavaDoc toString() {
127         String JavaDoc ls = System.getProperty("line.separator");
128         String JavaDoc str = super.toString();
129         if (cause != null) {
130             str = str + ls +
131                   "*****" + ls +
132                   stackToString(cause);
133         }
134         return str;
135     }
136
137     private static String JavaDoc stackToString(Throwable JavaDoc e){
138       java.io.StringWriter JavaDoc sw= new java.io.StringWriter JavaDoc(1024);
139       java.io.PrintWriter JavaDoc pw= new java.io.PrintWriter JavaDoc(sw);
140       e.printStackTrace(pw);
141       pw.close();
142       return sw.toString();
143     }
144 }
145
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