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17 package org.apache.commons.discovery;
18
19
20 /***
21 * <p>An exception that is thrown only if a suitable service
22 * instance cannot be created by <code>ServiceFactory</code></p>
23 *
24 * <p>Copied from LogConfigurationException<p>
25 *
26 * @author Craig R. McClanahan
27 * @version $Revision: 480374 $ $Date: 2006-11-28 19:33:25 -0800 (Tue, 28 Nov 2006) $
28 */
29 public class DiscoveryException extends RuntimeException {
30
31
32 /***
33 * Construct a new exception with <code>null</code> as its detail message.
34 */
35 public DiscoveryException() {
36 super();
37 }
38
39 /***
40 * Construct a new exception with the specified detail message.
41 *
42 * @param message The detail message
43 */
44 public DiscoveryException(String message) {
45 super(message);
46 }
47
48 /***
49 * Construct a new exception with the specified cause and a derived
50 * detail message.
51 *
52 * @param cause The underlying cause
53 */
54 public DiscoveryException(Throwable cause) {
55 this((cause == null) ? null : cause.toString(), cause);
56 }
57
58 /***
59 * Construct a new exception with the specified detail message and cause.
60 *
61 * @param message The detail message
62 * @param cause The underlying cause
63 */
64 public DiscoveryException(String message, Throwable cause) {
65 super(message);
66 this.cause = cause;
67 }
68
69 /***
70 * The underlying cause of this exception.
71 */
72 protected Throwable cause = null;
73
74 /***
75 * Return the underlying cause of this exception (if any).
76 */
77 public Throwable getCause() {
78 return this.cause;
79 }
80
81 public String toString() {
82 String ls = System.getProperty("line.separator");
83 String str = super.toString();
84 if (cause != null) {
85 str = str + ls +
86 "*****" + ls +
87 stackToString(cause);
88 }
89 return str;
90 }
91
92 private static String stackToString(Throwable e){
93 java.io.StringWriter sw= new java.io.StringWriter(1024);
94 java.io.PrintWriter pw= new java.io.PrintWriter(sw);
95 e.printStackTrace(pw);
96 pw.close();
97 return sw.toString();
98 }
99 }