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author Frank Benoit <benoit@tionex.de>
date Sat, 05 Jan 2008 00:29:12 +0100
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1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 module org.eclipse.swt.SWTError;
12
13 import org.eclipse.swt.SWT;
14
15 import tango.core.Exception;
16 import tango.io.Stdout;
17
18 /**
19 * This error is thrown whenever an unrecoverable error
20 * occurs internally in SWT. The message text and error code
21 * provide a further description of the problem. The exception
22 * has a <code>throwable</code> field which holds the underlying
23 * throwable that caused the problem (if this information is
24 * available (i.e. it may be null)).
25 * <p>
26 * SWTErrors are thrown when something fails internally which
27 * either leaves SWT in an unknown state (eg. the o/s call to
28 * remove an item from a list returns an error code) or when SWT
29 * is left in a known-to-be-unrecoverable state (eg. it runs out
30 * of callback resources). SWTErrors should not occur in typical
31 * programs, although "high reliability" applications should
32 * still catch them.
33 * </p><p>
34 * This class also provides support methods used by SWT to match
35 * error codes to the appropriate exception class (SWTError,
36 * SWTException, or IllegalArgumentException) and to provide
37 * human readable strings for SWT error codes.
38 * </p>
39 *
40 * @see SWTException
41 * @see SWT#error(int)
42 */
43
44 public class SWTError : PlatformException {
45 /**
46 * The SWT error code, one of SWT.ERROR_*.
47 */
48 public int code;
49
50 /**
51 * The underlying throwable that caused the problem,
52 * or null if this information is not available.
53 */
54 public TracedException throwable;
55
56 //static final long serialVersionUID = 3833467327105808433L;
57
58 /**
59 * Constructs a new instance of this class with its
60 * stack trace filled in. The error code is set to an
61 * unspecified value.
62 */
63 public this () {
64 this (SWT.ERROR_UNSPECIFIED);
65 }
66
67 /**
68 * Constructs a new instance of this class with its
69 * stack trace and message filled in. The error code is
70 * set to an unspecified value. Specifying <code>null</code>
71 * as the message is equivalent to specifying an empty string.
72 *
73 * @param message the detail message for the exception
74 */
75 public this (char[] message) {
76 this (SWT.ERROR_UNSPECIFIED, message);
77 }
78
79 /**
80 * Constructs a new instance of this class with its
81 * stack trace and error code filled in.
82 *
83 * @param code the SWT error code
84 */
85 public this (int code) {
86 this (code, SWT.findErrorText (code));
87 }
88
89 /**
90 * Constructs a new instance of this class with its
91 * stack trace, error code and message filled in.
92 * Specifying <code>null</code> as the message is
93 * equivalent to specifying an empty string.
94 *
95 * @param code the SWT error code
96 * @param message the detail message for the exception
97 */
98 public this (int code, char[] message) {
99 super (message);
100 this.code = code;
101 }
102
103 /**
104 * Returns the underlying throwable that caused the problem,
105 * or null if this information is not available.
106 * <p>
107 * NOTE: This method overrides Throwable.getCause() that was
108 * added to JDK1.4. It is necessary to override this method
109 * in order for inherited printStackTrace() methods to work.
110 * </p>
111 * @return the underlying throwable
112 *
113 * @since 3.1
114 */
115 public Exception getCause() {
116 return throwable;
117 }
118
119 /**
120 * Returns the string describing this SWTError object.
121 * <p>
122 * It is combined with the message string of the Throwable
123 * which caused this SWTError (if this information is available).
124 * </p>
125 * @return the error message string of this SWTError object
126 */
127 public char[] getMessage () {
128 if (throwable is null)
129 return super.toString();
130 return super.toString () ~ " (" ~ throwable.toString () ~ ")"; //$NON-NLS-1$ //$NON-NLS-2$
131 }
132
133 /**
134 * Outputs a printable representation of this error's
135 * stack trace on the standard error stream.
136 * <p>
137 * Note: printStackTrace(PrintStream) and printStackTrace(PrintWriter)
138 * are not provided in order to maintain compatibility with CLDC.
139 * </p>
140 */
141 public void printStackTrace () {
142 Stderr.formatln( "stacktrace follows (if feature compiled in)" );
143 foreach( msg; this ){
144 Stderr.formatln( "{}", msg );
145 }
146 if ( throwable !is null) {
147 Stderr.formatln ("*** Stack trace of contained error ***"); //$NON-NLS-1$
148 foreach( msg; throwable ){
149 Stderr.formatln( "{}", msg );
150 }
151 }
152 }
153
154 }