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annotate graal/com.oracle.max.base/src/com/sun/max/program/ProgramError.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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 *
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35 */
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36 private static final long serialVersionUID = -4457023777191065175L;
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37
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38 /**
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39 * Implemented by a client that can {@linkplain ProgramError#setHandler(Handler) register}
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40 * itself to handle program errors instead of having them result in a {@link ProgramError}
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41 * instance raised.
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42 */
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43 public interface Handler {
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44
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45 /**
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46 * Handles a given error condition. This method should never return normally.
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47 *
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48 * @param message a message describing the error condition. This value may be {@code null}
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49 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null}
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50 */
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51 void handle(String message, Throwable throwable);
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52 }
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53
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54 /**
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55 * Registers a handler to which error reporting is redirected. Any previously registered handler
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56 * is overwritten and discarded.
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57 *
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58 * @param h if non-null, this object's {@link Handler#handle(String, Throwable)} method is messaged instead of
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59 * raising a ProgramError.
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60 */
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61 public static void setHandler(Handler h) {
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62 handler = h;
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63 }
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64
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65 private ProgramError(String message, Throwable cause) {
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66 super(message, cause);
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67 }
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68
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69 /**
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70 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken.
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71 * The message reported to this action is {@code "Program Error"}.
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72 *
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73 * @param condition a condition to test
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74 */
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75 public static void check(boolean condition) {
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76 if (!condition) {
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77 throw unexpected(null, null);
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78 }
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79 }
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80
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81 /**
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82 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken.
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83 *
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84 * @param condition a condition to test
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85 * @param message a message describing the error condition being tested
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86 */
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87 public static void check(boolean condition, String message) {
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88 if (!condition) {
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89 throw unexpected(message, null);
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90 }
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91 }
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92
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93 /**
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94 * Checks a given condition and if it's {@code false}, the appropriate error handling action is taken.
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95 *
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96 * @param condition a condition to test
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97 * @param message a message describing the error condition being tested
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98 * @param object an object whose string description is to be appended to the message
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99 */
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100 public static void check(boolean condition, String message, Object object) {
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101 if (!condition) {
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102 throw unexpected(message + object.toString(), null);
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103 }
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104 }
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105
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106 /**
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107 * Reports the occurrence of some error condition triggering the appropriate error handling action
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108 * to be taken. By default, this action is to raise a {@link ProgramError} exception. However,
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109 * if an alternative error handler has been {@linkplain #setHandler(Handler) registered}, its
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110 * {@link Handler#handle(String, Throwable)} method is called instead.
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111 *
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112 * This method never returns normally.
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113 *
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114 * @param message a message describing the error condition. This value may be {@code null}.
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115 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null}.
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116 */
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117 public static ProgramError unexpected(String message, Throwable throwable) {
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118 if (handler != null) {
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119 handler.handle(message, throwable);
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120 }
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121 if (message == null) {
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122 throw new ProgramError("Unexpected Program Error:", throwable);
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123 }
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124 throw new ProgramError("Unexpected Program Error: " + message, throwable);
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125 }
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126
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127 /**
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128 * Reports the occurrence of some error condition.
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129 *
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130 * This method never returns normally.
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131 *
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132 * @param message a message describing the error condition. This value may be {@code null}.
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133 * @see #unexpected(String, Throwable)
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134 */
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135 public static ProgramError unexpected(String message) {
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136 throw unexpected(message, null);
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137 }
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138
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139 /**
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140 * Reports the occurrence of some error condition.
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141 *
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142 * This method never returns normally.
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143 *
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144 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null}
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145 * @see #unexpected(String, Throwable)
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146 */
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147 public static ProgramError unexpected(Throwable throwable) {
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148 throw unexpected(null, throwable);
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149 }
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150
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151 /**
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152 * Reports the occurrence of some error condition.
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153 *
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154 * This method never returns normally.
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155 *
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156 * @param throwable an exception given more detail on the cause of the error condition. This value may be {@code null}
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157 * @see #unexpected(String, Throwable)
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158 */
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159 public static ProgramError unexpected() {
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160 throw unexpected((String) null);
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161 }
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162
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163 /**
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164 * Reports that a {@code switch} statement encountered a {@code case} value it was not expecting.
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165 *
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166 * This method never returns normally.
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167 *
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168 * @see #unexpected(String, Throwable)
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169 */
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170 public static ProgramError unknownCase() {
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171 throw unexpected("unknown switch case");
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172 }
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173
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174 /**
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175 * Reports that a {@code switch} statement encountered a {@code case} value it was not expecting.
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176 *
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177 * This method never returns normally.
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178 *
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179 * @param caseValue the unexpected {@code case} value as a string
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180 * @see #unexpected(String, Throwable)
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181 */
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182 public static ProgramError unknownCase(String caseValue) {
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183 throw unexpected("unknown switch case: " + caseValue);
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184 }
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185
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186 // Checkstyle: stop
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187 private static Handler handler = null;
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188 }