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annotate dwt/DWTException.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 8b48be5454ce
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *
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11 * Port to the D Programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.DWTError;
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15
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16 import dwt.DWTError;
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17 import dwt.DWT;
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18
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19 import dwt.internal.Library;
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20
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21 import dwt.dwthelper.utils;
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22
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23 /**
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24 * This runtime exception is thrown whenever a recoverable error
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25 * occurs internally in DWT. The message text and error code
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26 * provide a further description of the problem. The exception
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27 * has a <code>throwable</code> field which holds the underlying
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28 * exception that caused the problem (if this information is
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29 * available (i.e. it may be null)).
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30 * <p>
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31 * DWTExceptions are thrown when something fails internally,
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32 * but DWT is left in a known stable state (eg. a widget call
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33 * was made from a non-u/i thread, or there is failure while
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34 * reading an Image because the source file was corrupt).
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35 * </p>
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36 *
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37 * @see DWTError
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38 */
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39
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40 public class DWTException : Exception {
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41 /**
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42 * The DWT error code, one of DWT.ERROR_*.
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43 */
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44 public int code;
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45
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46 /**
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47 * The underlying throwable that caused the problem,
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48 * or null if this information is not available.
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49 */
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50 public Exception throwable (Exception e) {
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51 this.next = e;
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52 return this.next;
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53 }
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54
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55 public Exception throwable () {
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56 return this.next;
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57 }
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58
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59 static final long serialVersionUID = 3257282552304842547L;
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60
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61 /**
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62 * Constructs a new instance of this class with its
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63 * stack trace filled in. The error code is set to an
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64 * unspecified value.
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65 */
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66 public this () {
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67 this(DWT.ERROR_UNSPECIFIED);
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68 }
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69
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70 /**
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71 * Constructs a new instance of this class with its
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72 * stack trace and message filled in. The error code is
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73 * set to an unspecified value. Specifying <code>null</code>
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74 * as the message is equivalent to specifying an empty String.
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75 *
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76 * @param message the detail message for the exception
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77 */
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78 public this (String message) {
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79 this(DWT.ERROR_UNSPECIFIED, message);
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80 }
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81
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82 /**
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83 * Constructs a new instance of this class with its
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84 * stack trace and error code filled in.
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85 *
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86 * @param code the DWT error code
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87 */
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88 public this (int code) {
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89 this(code, DWT.findErrorText(code));
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90 }
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91
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92 /**
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93 * Constructs a new instance of this class with its
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94 * stack trace, error code and message filled in.
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95 * Specifying <code>null</code> as the message is
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96 * equivalent to specifying an empty String.
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97 *
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98 * @param code the DWT error code
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99 * @param message the detail message for the exception
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100 */
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101 public this (int code, String message) {
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102 super(message);
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103 this.code = code;
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104 }
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105
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106 /**
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107 * Returns the underlying throwable that caused the problem,
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108 * or null if this information is not available.
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109 * <p>
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110 * NOTE: This method overrides Throwable.getCause() that was
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111 * added to JDK1.4. It is necessary to override this method
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112 * in order for inherited printStackTrace() methods to work.
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113 * </p>
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114 * @return the underlying throwable
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115 *
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116 * @since 3.1
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117 */
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118 public Exception getCause () {
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119 return throwable;
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120 }
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121
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122 /**
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123 * Returns the String describing this DWTException object.
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124 * <p>
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125 * It is combined with the message String of the Throwable
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126 * which caused this DWTException (if this information is available).
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127 * </p>
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128 * @return the error message String of this DWTException object
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129 */
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130 public String getMessage () {
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131 if (throwable is null)
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132 return super.getMessage();
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133 return super.getMessage() + " (" + throwable.toString() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
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134 }
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135
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136 /**
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137 * Outputs a printable representation of this exception's
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138 * stack trace on the standard error stream.
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139 * <p>
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140 * Note: printStackTrace(PrintStream) and printStackTrace(PrintWriter)
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141 * are not provided in order to maintain compatibility with CLDC.
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142 * </p>
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143 */
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144 public void printStackTrace () {
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145 super.printStackTrace();
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146 if (Library.JAVA_VERSION < Library.JAVA_VERSION(1, 4, 0) && throwable !is null) {
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147 System.err.println("*** Stack trace of contained exception ***"); //$NON-NLS-1$
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148 throwable.printStackTrace();
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149 }
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150 }
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151
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152 }