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Fixes to get dwt to work with dmd and ldc
author Jacob Carlborg <doob@me.com>
date Wed, 08 Jul 2009 21:56:44 +0200
parents d8635bb48c7c
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1 /*******************************************************************************
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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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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>
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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
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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)
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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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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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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 }