Mercurial > projects > dwt-mac
annotate dwt/DWTError.d @ 45:d8635bb48c7c
Merge with SWT 3.5
author | Jacob Carlborg <doob@me.com> |
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date | Mon, 01 Dec 2008 17:07:00 +0100 |
parents | db5a898b2119 |
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45 | 1 /******************************************************************************* |
2 * Copyright (c) 2000, 2008 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 * Frank Benoit <benoit@tionex.de> |
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13 * Jacob Carlborg <jacob.carlborg@gmail.com> |
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14 *******************************************************************************/ |
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15 module dwt.DWTError; |
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16 |
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17 import tango.io.Stdout; |
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18 |
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19 import dwt.DWT; |
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20 import dwt.dwthelper.utils; |
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21 |
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22 alias toString getMessage; |
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23 |
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24 /** |
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25 * This error is thrown whenever an unrecoverable error |
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26 * occurs internally in DWT. The message text and error code |
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27 * provide a further description of the problem. The exception |
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28 * has a <code>throwable</code> field which holds the underlying |
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29 * throwable that caused the problem (if this information is |
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30 * available (i.e. it may be null)). |
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31 * <p> |
45 | 32 * DWTErrors are thrown when something fails internally which |
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33 * either leaves DWT in an unknown state (eg. the o/s call to |
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34 * remove an item from a list returns an error code) or when DWT |
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35 * is left in a known-to-be-unrecoverable state (eg. it runs out |
45 | 36 * of callback resources). DWTErrors should not occur in typical |
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37 * programs, although "high reliability" applications should |
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38 * still catch them. |
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39 * </p><p> |
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40 * This class also provides support methods used by DWT to match |
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41 * error codes to the appropriate exception class (DWTError, |
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42 * DWTException, or IllegalArgumentException) and to provide |
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43 * human readable strings for DWT error codes. |
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44 * </p> |
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45 * |
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46 * @see DWTException |
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47 * @see DWT#error(int) |
45 | 48 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
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49 */ |
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50 |
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51 public class DWTError : Error { |
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52 /** |
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53 * The DWT error code, one of DWT.ERROR_*. |
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54 */ |
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55 public int code; |
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56 |
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57 /** |
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58 * The underlying throwable that caused the problem, |
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59 * or null if this information is not available. |
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60 */ |
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61 public Throwable throwable( Exception e ){ |
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62 this.next = e; |
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63 return this.next; |
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64 } |
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65 public Throwable throwable(){ |
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66 return this.next; |
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67 } |
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68 |
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69 static const long serialVersionUID = 3833467327105808433L; |
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70 |
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71 /** |
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72 * Constructs a new instance of this class with its |
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73 * stack trace filled in. The error code is set to an |
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74 * unspecified value. |
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75 */ |
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76 public this () { |
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77 this (DWT.ERROR_UNSPECIFIED); |
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78 } |
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79 |
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80 /** |
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81 * Constructs a new instance of this class with its |
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82 * stack trace and message filled in. The error code is |
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83 * set to an unspecified value. Specifying <code>null</code> |
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84 * as the message is equivalent to specifying an empty string. |
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85 * |
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86 * @param message the detail message for the exception |
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87 */ |
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88 public this (String message) { |
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89 this (DWT.ERROR_UNSPECIFIED, message); |
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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 and error code filled in. |
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95 * |
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96 * @param code the DWT error code |
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97 */ |
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98 public this (int code) { |
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99 this (code, DWT.findErrorText (code)); |
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100 } |
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101 |
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102 /** |
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103 * Constructs a new instance of this class with its |
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104 * stack trace, error code and message filled in. |
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105 * Specifying <code>null</code> as the message is |
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106 * equivalent to specifying an empty string. |
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107 * |
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108 * @param code the DWT error code |
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109 * @param message the detail message for the exception |
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110 */ |
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111 public this (int code, String message) { |
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112 super (message); |
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113 this.code = code; |
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114 } |
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115 |
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116 /** |
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117 * Returns the underlying throwable that caused the problem, |
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118 * or null if this information is not available. |
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119 * <p> |
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120 * NOTE: This method overrides Throwable.getCause() that was |
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121 * added to JDK1.4. It is necessary to override this method |
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122 * in order for inherited printStackTrace() methods to work. |
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123 * </p> |
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124 * @return the underlying throwable |
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125 * |
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126 * @since 3.1 |
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127 */ |
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128 public Throwable getCause() { |
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129 return throwable; |
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130 } |
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131 |
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132 /** |
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133 * Returns the string describing this DWTError object. |
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134 * <p> |
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135 * It is combined with the message string of the Throwable |
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136 * which caused this DWTError (if this information is available). |
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137 * </p> |
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138 * @return the error message string of this DWTError object |
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139 */ |
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140 public String getMessage () { |
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141 if (throwable is null) return super.toString(); |
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142 return super.toString () ~ " (" ~ throwable.toString () ~ ")"; //$NON-NLS-1$ //$NON-NLS-2$ |
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143 } |
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144 |
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145 /** |
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146 * Outputs a printable representation of this error's |
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147 * stack trace on the standard error stream. |
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148 * <p> |
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149 * Note: printStackTrace(PrintStream) and printStackTrace(PrintWriter) |
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150 * are not provided in order to maintain compatibility with CLDC. |
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151 * </p> |
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152 */ |
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153 public void printStackTrace () { |
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154 Stderr.formatln( "stacktrace follows (if feature compiled in)" ); |
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155 foreach( msg; info ){ |
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156 Stderr.formatln( "{}", msg ); |
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157 } |
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158 if ( throwable !is null) { |
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159 Stderr.formatln ("*** Stack trace of contained error ***"); //$NON-NLS-1$ |
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160 foreach( msg; throwable.info ){ |
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161 Stderr.formatln( "{}", msg ); |
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162 } |
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163 } |
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164 } |
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165 |
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166 } |