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