Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/program/ProgramError.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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children | bc8527f3071c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.program; |
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24 |
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25 /** |
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26 * A collection of static methods for reporting errors indicating some fatal condition. |
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27 * In the target VM, these errors can be made to perform a hard exit of the VM by |
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28 * redirecting them via a {@linkplain #setHandler(Handler) registered} error handler. |
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29 */ |
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30 |
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31 public final class ProgramError extends Error { |
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32 |
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33 /** |
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34 * Implemented by a client that can {@linkplain ProgramError#setHandler(Handler) register} |
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35 * itself to handle program errors instead of having them result in a {@link ProgramError} |
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36 * instance raised. |
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37 */ |
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38 public interface Handler { |
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39 |
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40 /** |
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41 * Handles a given error condition. This method should never return normally. |
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42 * |
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43 * @param message a message describing the error condition. This value may be {@code null} |
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44 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null} |
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45 */ |
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46 void handle(String message, Throwable throwable); |
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47 } |
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48 |
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49 /** |
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50 * Registers a handler to which error reporting is redirected. Any previously registered handler |
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51 * is overwritten and discarded. |
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52 * |
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53 * @param h if non-null, this object's {@link Handler#handle(String, Throwable)} method is messaged instead of |
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54 * raising a ProgramError. |
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55 */ |
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56 public static void setHandler(Handler h) { |
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57 handler = h; |
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58 } |
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59 |
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60 private ProgramError(String message, Throwable cause) { |
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61 super(message, cause); |
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62 } |
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63 |
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64 /** |
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65 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken. |
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66 * The message reported to this action is {@code "Program Error"}. |
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67 * |
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68 * @param condition a condition to test |
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69 */ |
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70 public static void check(boolean condition) { |
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71 if (!condition) { |
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72 throw unexpected(null, null); |
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73 } |
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74 } |
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75 |
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76 /** |
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77 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken. |
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78 * |
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79 * @param condition a condition to test |
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80 * @param message a message describing the error condition being tested |
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81 */ |
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82 public static void check(boolean condition, String message) { |
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83 if (!condition) { |
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84 throw unexpected(message, null); |
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85 } |
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86 } |
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87 |
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88 /** |
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89 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken. |
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90 * |
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91 * @param condition a condition to test |
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92 * @param message a message describing the error condition being tested |
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93 * @param object an object whose string description is to be appended to the message |
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94 */ |
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95 public static void check(boolean condition, String message, Object object) { |
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96 if (!condition) { |
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97 throw unexpected(message + object.toString(), null); |
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98 } |
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99 } |
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100 |
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101 /** |
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102 * Reports the occurrence of some error condition triggering the appropriate error handling action |
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103 * to be taken. By default, this action is to raise a {@link ProgramError} exception. However, |
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104 * if an alternative error handler has been {@linkplain #setHandler(Handler) registered}, its |
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105 * {@link Handler#handle(String, Throwable)} method is called instead. |
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106 * |
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107 * This method never returns normally. |
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108 * |
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109 * @param message a message describing the error condition. This value may be {@code null}. |
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110 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null}. |
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111 */ |
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112 public static ProgramError unexpected(String message, Throwable throwable) { |
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113 if (handler != null) { |
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114 handler.handle(message, throwable); |
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115 } |
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116 if (message == null) { |
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117 throw new ProgramError("Unexpected Program Error:", throwable); |
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118 } |
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119 throw new ProgramError("Unexpected Program Error: " + message, throwable); |
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120 } |
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121 |
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122 /** |
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123 * Reports the occurrence of some error condition. |
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124 * |
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125 * This method never returns normally. |
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126 * |
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127 * @param message a message describing the error condition. This value may be {@code null}. |
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128 * @see #unexpected(String, Throwable) |
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129 */ |
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130 public static ProgramError unexpected(String message) { |
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131 throw unexpected(message, null); |
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132 } |
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133 |
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134 /** |
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135 * Reports the occurrence of some error condition. |
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136 * |
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137 * This method never returns normally. |
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138 * |
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139 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null} |
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140 * @see #unexpected(String, Throwable) |
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141 */ |
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142 public static ProgramError unexpected(Throwable throwable) { |
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143 throw unexpected(null, throwable); |
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144 } |
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145 |
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146 /** |
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147 * Reports the occurrence of some error condition. |
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148 * |
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149 * This method never returns normally. |
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150 * |
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151 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null} |
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152 * @see #unexpected(String, Throwable) |
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153 */ |
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154 public static ProgramError unexpected() { |
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155 throw unexpected((String) null); |
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156 } |
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157 |
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158 /** |
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159 * Reports that a {@code switch} statement encountered a {@code case} value it was not expecting. |
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160 * |
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161 * This method never returns normally. |
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162 * |
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163 * @see #unexpected(String, Throwable) |
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164 */ |
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165 public static ProgramError unknownCase() { |
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166 throw unexpected("unknown switch case"); |
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167 } |
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168 |
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169 /** |
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170 * Reports that a {@code switch} statement encountered a {@code case} value it was not expecting. |
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171 * |
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172 * This method never returns normally. |
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173 * |
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174 * @param caseValue the unexpected {@code case} value as a string |
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175 * @see #unexpected(String, Throwable) |
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176 */ |
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177 public static ProgramError unknownCase(String caseValue) { |
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178 throw unexpected("unknown switch case: " + caseValue); |
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179 } |
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180 |
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181 // Checkstyle: stop |
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182 private static Handler handler = null; |
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183 } |