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1 /* |
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2 * Copyright (c) 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.javac.util; |
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27 |
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28 |
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29 /** |
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30 * Simple facility for unconditional assertions. |
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31 * The methods in this class are described in terms of equivalent assert |
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32 * statements, assuming that assertions have been enabled. |
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33 * |
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34 * <p><b>This is NOT part of any supported API. |
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35 * If you write code that depends on this, you do so at your own risk. |
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36 * This code and its internal interfaces are subject to change or |
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37 * deletion without notice.</b> |
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38 */ |
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39 public class Assert { |
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40 /** Equivalent to |
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41 * assert cond; |
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42 */ |
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43 public static void check(boolean cond) { |
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44 if (!cond) |
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45 error(); |
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46 } |
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47 |
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48 /** Equivalent to |
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49 * assert (o == null); |
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50 */ |
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51 public static void checkNull(Object o) { |
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52 if (o != null) |
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53 error(); |
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54 } |
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55 |
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56 /** Equivalent to |
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57 * assert (t != null); return t; |
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58 */ |
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59 public static <T> T checkNonNull(T t) { |
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60 if (t == null) |
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61 error(); |
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62 return t; |
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63 } |
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64 |
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65 /** Equivalent to |
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66 * assert cond : value; |
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67 */ |
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68 public static void check(boolean cond, int value) { |
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69 if (!cond) |
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70 error(String.valueOf(value)); |
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71 } |
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72 |
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73 /** Equivalent to |
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74 * assert cond : value; |
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75 */ |
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76 public static void check(boolean cond, long value) { |
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77 if (!cond) |
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78 error(String.valueOf(value)); |
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79 } |
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80 |
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81 /** Equivalent to |
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82 * assert cond : value; |
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83 */ |
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84 public static void check(boolean cond, Object value) { |
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85 if (!cond) |
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86 error(String.valueOf(value)); |
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87 } |
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88 |
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89 /** Equivalent to |
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90 * assert cond : value; |
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91 */ |
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92 public static void check(boolean cond, String msg) { |
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93 if (!cond) |
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94 error(msg); |
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95 } |
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96 |
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97 /** Equivalent to |
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98 * assert (o == null) : value; |
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99 */ |
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100 public static void checkNull(Object o, Object value) { |
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101 if (o != null) |
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102 error(String.valueOf(value)); |
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103 } |
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104 |
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105 /** Equivalent to |
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106 * assert (o == null) : value; |
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107 */ |
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108 public static void checkNull(Object o, String msg) { |
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109 if (o != null) |
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110 error(msg); |
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111 } |
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112 |
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113 /** Equivalent to |
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114 * assert (o != null) : value; |
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115 */ |
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116 public static <T> T checkNonNull(T t, String msg) { |
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117 if (t == null) |
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118 error(msg); |
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119 return t; |
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120 } |
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121 |
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122 /** Equivalent to |
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123 * assert false; |
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124 */ |
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125 public static void error() { |
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126 throw new AssertionError(); |
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127 } |
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128 |
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129 /** Equivalent to |
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130 * assert false : msg; |
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131 */ |
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132 public static void error(String msg) { |
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133 throw new AssertionError(msg); |
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134 } |
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135 |
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136 /** Prevent instantiation. */ |
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137 private Assert() { } |
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138 } |