Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/lang/Classes.java @ 4143:df24df51bffd
make domake executable
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Sun, 18 Dec 2011 13:55:25 +0100 |
parents | e233f5660da4 |
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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.lang; |
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24 |
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25 import java.lang.reflect.*; |
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26 |
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27 import com.sun.max.*; |
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28 |
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29 /** |
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30 * Methods that might be members of java.lang.Class. |
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31 */ |
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32 public final class Classes { |
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33 |
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34 private Classes() { |
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35 } |
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36 |
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37 /** |
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38 * Wraps a call to {@link ClassLoader#loadClass(String)} that is expected not to fail. Should a |
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39 * {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError} |
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40 * |
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41 * @return the value returned by calling {@link ClassLoader#loadClass(String)} on {@code classLoader} |
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42 */ |
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43 public static Class load(ClassLoader classLoader, String name) { |
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44 try { |
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45 return classLoader.loadClass(name); |
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46 } catch (ClassNotFoundException e) { |
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47 throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e); |
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48 } |
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49 } |
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50 |
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51 /** |
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52 * Wraps a call to {@link Class#forName(String)} that is expected not to fail. Should a |
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53 * {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError} |
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54 */ |
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55 public static Class forName(String name) { |
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56 try { |
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57 return Class.forName(name); |
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58 } catch (ClassNotFoundException e) { |
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59 throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e); |
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60 } |
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61 } |
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62 |
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63 /** |
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64 * Wraps a call to {@link Class#forName(String, boolean, ClassLoader)} that is expected not to fail. Should a |
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65 * {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError} |
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66 */ |
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67 public static Class forName(String name, boolean initialize, ClassLoader loader) { |
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68 try { |
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69 return Class.forName(name, initialize, loader); |
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70 } catch (ClassNotFoundException e) { |
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71 throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e); |
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72 } |
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73 } |
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74 |
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75 /** |
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76 * Links a given class. If the class {@code c} has already been linked, then this method simply returns. Otherwise, |
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77 * the class is linked as described in the "Execution" chapter of the <a |
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78 * href="http://java.sun.com/docs/books/jls/">Java Language Specification</a>. |
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79 * |
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80 * @param c the class to link |
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81 */ |
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82 public static void link(Class c) { |
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83 if (c != null) { |
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84 try { |
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85 final Class<?> linkedClass = Class.forName(c.getName(), false, c.getClassLoader()); |
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86 assert linkedClass == c; |
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87 } catch (ClassNotFoundException classNotFoundException) { |
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88 throw (NoClassDefFoundError) new NoClassDefFoundError(c.getName()).initCause(classNotFoundException); |
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89 } |
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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 * Initializes a given class. If the class {@code c} has already been initialized, then this method simply returns. Otherwise, |
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95 * the class is linked as described in the "Execution" chapter of the <a |
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96 * href="http://java.sun.com/docs/books/jls/">Java Language Specification</a>. |
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97 * |
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98 * @param c the class to link |
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99 */ |
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100 public static void initialize(Class c) { |
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101 try { |
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102 Class.forName(c.getName(), true, c.getClassLoader()); |
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103 } catch (ClassNotFoundException classNotFoundException) { |
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104 throw (NoClassDefFoundError) new NoClassDefFoundError(c.getName()).initCause(classNotFoundException); |
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105 } |
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106 } |
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107 |
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108 public static boolean areRelated(Class<?> class1, Class<?> class2) { |
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109 return class1.isAssignableFrom(class2) || class2.isAssignableFrom(class1); |
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110 } |
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111 |
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112 public static boolean areAssignableFrom(Class<?>[] superTypes, Class<?>... subTypes) { |
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113 if (superTypes.length != subTypes.length) { |
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114 return false; |
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115 } |
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116 for (int i = 0; i < superTypes.length; i++) { |
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117 if (!superTypes[i].isAssignableFrom(subTypes[i])) { |
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118 return false; |
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119 } |
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120 } |
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121 return true; |
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122 } |
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123 |
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124 /** |
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125 * Extends the functionality of {@link Class#getConstructor(Class...)} to find a constructor whose formal parameter |
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126 * types are assignable from the types of a list of arguments. |
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127 * |
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128 * @param javaClass the class to search in |
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129 * @param arguments the list of arguments that will be passed to the constructor |
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130 * @return the first constructor in {@link Class#getConstructors() javaClass.getConstructors()} that will accept |
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131 * {@code arguments} or null if no such constructor exists |
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132 */ |
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133 public static Constructor<?> findConstructor(Class<?> javaClass, Object... arguments) { |
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134 nextConstructor: |
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135 for (Constructor<?> constructor : javaClass.getConstructors()) { |
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136 final Class<?>[] parameterTypes = constructor.getParameterTypes(); |
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137 if (parameterTypes.length == arguments.length) { |
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138 for (int i = 0; i != arguments.length; ++i) { |
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139 if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) { |
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140 continue nextConstructor; |
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141 } |
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142 } |
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143 return constructor; |
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144 } |
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145 } |
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146 return null; |
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147 } |
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148 |
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149 /** |
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150 * Extends the functionality of {@link Class#getMethod(String, Class...)} to find a method whose formal parameter |
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151 * types are assignable from the types of a list of arguments. |
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152 * |
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153 * @param javaClass the class to search in |
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154 * @param name the name of the method to search for |
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155 * @param arguments the list of arguments that will be passed to the constructor |
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156 * @return the first method in {@link Class#getMethods() javaClass.getMethods()} that will accept {@code arguments} |
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157 * or null if no such method exists |
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158 */ |
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159 public static Method findMethod(Class<?> javaClass, String name, Object... arguments) { |
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160 nextMethod: |
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161 for (Method method : javaClass.getMethods()) { |
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162 final Class<?>[] parameterTypes = method.getParameterTypes(); |
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163 if (method.getName().equals(name) && parameterTypes.length == arguments.length) { |
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164 for (int i = 0; i != arguments.length; ++i) { |
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165 if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) { |
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166 continue nextMethod; |
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167 } |
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168 } |
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169 return method; |
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170 } |
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171 } |
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172 return null; |
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173 } |
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174 |
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175 /** |
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176 * Extends the functionality of {@link Class#getDeclaredMethod(String, Class...)} to find a method whose formal |
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177 * parameter types are assignable from the types of a list of arguments. |
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178 * |
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179 * @param javaClass the class to search in |
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180 * @param name the name of the method to search for |
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181 * @param arguments the list of arguments that will be passed to the constructor |
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182 * @return the first method in {@link Class#getDeclaredMethods() javaClass.getDeclaredMethods()} that will accept |
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183 * {@code arguments} or null if no such method exists |
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184 */ |
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185 public static Method findDeclaredMethod(Class<?> javaClass, String name, Object... arguments) { |
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186 nextMethod: |
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187 for (Method declaredMethod : javaClass.getDeclaredMethods()) { |
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188 final Class<?>[] parameterTypes = declaredMethod.getParameterTypes(); |
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189 if (declaredMethod.getName().equals(name) && parameterTypes.length == arguments.length) { |
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190 for (int i = 0; i != arguments.length; ++i) { |
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191 if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) { |
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192 continue nextMethod; |
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193 } |
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194 } |
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195 return declaredMethod; |
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196 } |
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197 } |
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198 return null; |
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199 } |
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200 |
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201 /** |
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202 * Performs method resolution as detailed in section 5.4.3.3 of the JVM specification except for the accessibility |
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203 * checks detailed in section 5.4.4. |
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204 * |
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205 * @param javaClass the class to start the resolution from |
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206 * @param returnType the return type of the method to resolve |
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207 * @param name the name of the method to resolve |
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208 * @param parameterTypes the parameter types of the method to resolve |
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209 * @return the resolved method |
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210 * @throws NoSuchMethodError if the method resolution fails |
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211 * @throws AbstractMethodError if the resolved method is abstract |
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212 */ |
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213 public static Method resolveMethod(Class<?> javaClass, Class returnType, String name, Class... parameterTypes) { |
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214 if (!name.equals("<init>") && !name.equals("<clinit>")) { |
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215 Class<?> declaringClass = javaClass; |
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216 if (javaClass.isInterface()) { |
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217 try { |
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218 return javaClass.getMethod(name, parameterTypes); |
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219 } catch (NoSuchMethodException e) { |
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220 throw new NoSuchMethodError(e.getMessage()); |
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221 } |
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222 } |
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223 do { |
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224 try { |
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225 final Method method = getDeclaredMethod(declaringClass, returnType, name, parameterTypes); |
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226 if (Modifier.isAbstract(method.getModifiers()) && !Modifier.isAbstract(declaringClass.getModifiers())) { |
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227 throw new AbstractMethodError(); |
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228 } |
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229 return method; |
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230 } catch (NoSuchMethodError e) { |
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231 declaringClass = declaringClass.getSuperclass(); |
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|
232 } |
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|
233 } while (declaringClass != null); |
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234 } |
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235 throw new NoSuchMethodError(returnType.getName() + " " + javaClass.getName() + "." + name + "(" + Utils.toString(parameterTypes, ", ") + ")"); |
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|
236 } |
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237 |
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|
238 /** |
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239 * Performs field resolution as detailed in section 5.4.3.2 of the JVM specification except for the accessibility |
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240 * checks detailed in section 5.4.4. |
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|
241 * @param javaClass the class to start the resolution from |
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|
242 * @param type the type of the field to resolve |
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243 * @param name the name of the field to resolve |
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|
244 * |
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245 * @return the resolved field |
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246 * @throws NoSuchFieldError if the field resolution fails |
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247 */ |
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248 public static Field resolveField(Class<?> javaClass, Class type, String name) { |
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249 Class<?> declaringClass = javaClass; |
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250 do { |
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251 try { |
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252 return getDeclaredField(declaringClass, name, type); |
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253 } catch (NoSuchFieldError e) { |
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254 for (Class superInterface : javaClass.getInterfaces()) { |
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255 try { |
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256 return resolveField(superInterface, type, name); |
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257 } catch (NoSuchFieldError noSuchFieldError) { |
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258 // Ignore |
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259 } |
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260 } |
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261 declaringClass = declaringClass.getSuperclass(); |
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262 } |
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263 } while (declaringClass != null); |
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264 throw new NoSuchFieldError(type.getName() + " " + javaClass.getName() + "." + name); |
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265 } |
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266 |
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267 /** |
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268 * Gets the class or interface that declares the method, field or constructor represented by {@code member}. |
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269 */ |
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270 public static Class<?> getDeclaringClass(AccessibleObject member) { |
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271 if (member instanceof Method) { |
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272 final Method method = (Method) member; |
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273 return method.getDeclaringClass(); |
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274 } |
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275 if (member instanceof Field) { |
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276 final Field field = (Field) member; |
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277 return field.getDeclaringClass(); |
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278 } |
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279 assert member instanceof Constructor; |
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280 final Constructor constructor = (Constructor) member; |
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281 return constructor.getDeclaringClass(); |
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282 } |
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283 |
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284 /** |
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285 * Get hold of a non-public inner class. |
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286 */ |
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287 public static Class getInnerClass(Class outerClass, String innerClassSimpleName) { |
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288 for (Class innerClass : outerClass.getDeclaredClasses()) { |
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289 if (innerClass.getSimpleName().equals(innerClassSimpleName)) { |
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290 return innerClass; |
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291 } |
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292 } |
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293 return null; |
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294 } |
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295 |
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296 /** |
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297 * Extracts a package name from a fully qualified class name. |
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298 * |
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299 * @return "" if {@code className} denotes a class in the unnamed package |
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300 */ |
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301 public static String getPackageName(String className) { |
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302 final int index = className.lastIndexOf('.'); |
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303 if (index < 0) { |
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304 return ""; |
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305 } |
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306 return className.substring(0, index); |
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307 } |
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308 |
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309 /** |
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310 * Gets the package name for the package of a class. |
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311 * |
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312 * @return "" if {@code c} is a class in the unnamed package |
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313 */ |
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314 public static String getPackageName(Class c) { |
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315 return getPackageName(c.getName()); |
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316 } |
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317 |
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318 /** |
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319 * Extracts a simple class name from a fully qualified class name. |
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320 */ |
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321 public static String getSimpleName(String className) { |
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322 final int index = className.lastIndexOf('.'); |
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323 if (index < 0) { |
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324 return className; |
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325 } |
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326 return className.substring(index + 1); |
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327 } |
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328 |
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329 /** |
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330 * Extends the functionality of {@link Class#getSimpleName()} to include a non-empty string for anonymous and local |
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331 * classes. |
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332 * |
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333 * @param clazz the class for which the simple name is being requested |
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334 * @param withEnclosingClass specifies if the returned name should be qualified with the name(s) of the enclosing |
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335 * class/classes of {@code clazz} (if any). This option is ignored if {@code clazz} denotes an anonymous |
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336 * or local class. |
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337 * @return |
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338 */ |
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339 public static String getSimpleName(Class<?> clazz, boolean withEnclosingClass) { |
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340 final String simpleName = clazz.getSimpleName(); |
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341 if (simpleName.length() != 0) { |
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342 if (withEnclosingClass) { |
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343 String prefix = ""; |
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344 Class enclosingClass = clazz; |
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345 while ((enclosingClass = enclosingClass.getEnclosingClass()) != null) { |
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346 prefix = prefix + enclosingClass.getSimpleName() + "."; |
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347 } |
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348 return prefix + simpleName; |
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349 } |
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350 return simpleName; |
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351 } |
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352 // Must be an anonymous or local class |
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353 final String name = clazz.getName(); |
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354 int index = name.indexOf('$'); |
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355 if (index == -1) { |
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|
356 return name; |
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|
357 } |
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358 index = name.lastIndexOf('.', index); |
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359 if (index == -1) { |
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360 return name; |
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|
361 } |
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362 return name.substring(index + 1); |
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|
363 } |
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|
364 |
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|
365 /** |
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366 * Similar to {@link Class#getDeclaredMethod(String, Class...)} except that |
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367 * the search takes into account the return type. |
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|
368 */ |
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369 public static Method getDeclaredMethod(Class<?> clazz, Class returnType, String name, Class... parameterTypes) throws NoSuchMethodError { |
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370 for (Method javaMethod : clazz.getDeclaredMethods()) { |
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371 if (javaMethod.getName().equals(name) && javaMethod.getReturnType().equals(returnType)) { |
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372 final Class[] declaredParameterTypes = javaMethod.getParameterTypes(); |
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373 if (java.util.Arrays.equals(declaredParameterTypes, parameterTypes)) { |
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374 return javaMethod; |
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375 } |
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376 } |
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377 } |
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378 throw new NoSuchMethodError(returnType.getName() + " " + clazz.getName() + "." + name + "(" + Utils.toString(parameterTypes, ",") + ")"); |
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379 } |
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380 |
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381 /** |
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382 * A wrapper for a call to {@link Class#getDeclaredMethod(String, Class...)} that must succeed. |
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383 */ |
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384 public static Method getDeclaredMethod(Class<?> clazz, String name, Class... parameterTypes) { |
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385 try { |
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386 return clazz.getDeclaredMethod(name, parameterTypes); |
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387 } catch (NoSuchMethodException noSuchMethodException) { |
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388 throw (NoSuchMethodError) new NoSuchMethodError(clazz.getName() + "." + name + "(" + Utils.toString(parameterTypes, ",") + ")").initCause(noSuchMethodException); |
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389 } |
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390 } |
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391 |
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392 /** |
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393 * A wrapper for a call to {@link Class#getDeclaredConstructor(Class...)} that must succeed. |
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394 */ |
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395 public static Constructor getDeclaredConstructor(Class<?> clazz, Class... parameterTypes) { |
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396 try { |
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397 return clazz.getDeclaredConstructor(parameterTypes); |
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398 } catch (NoSuchMethodException noSuchMethodException) { |
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399 throw (NoSuchMethodError) new NoSuchMethodError(clazz.getName() + "(" + Utils.toString(parameterTypes, ",") + ")").initCause(noSuchMethodException); |
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400 } |
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401 } |
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402 |
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403 /** |
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404 * A wrapper for a call to {@link Class#getDeclaredField(String)} that must succeed. |
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405 */ |
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406 public static Field getDeclaredField(Class<?> clazz, String name) { |
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407 try { |
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408 return clazz.getDeclaredField(name); |
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409 } catch (NoSuchFieldException noSuchFieldException) { |
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410 throw (NoSuchFieldError) new NoSuchFieldError(clazz.getName() + "." + name).initCause(noSuchFieldException); |
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411 } |
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412 } |
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413 |
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414 /** |
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415 * Similar to {@link Class#getDeclaredField(String)} except that the lookup takes into account a given field type. |
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416 */ |
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417 public static Field getDeclaredField(Class<?> clazz, String name, Class type) throws NoSuchFieldError { |
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418 for (Field field : clazz.getDeclaredFields()) { |
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419 if (field.getName().equals(name) && field.getType().equals(type)) { |
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420 return field; |
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421 } |
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422 } |
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423 throw new NoSuchFieldError(type.getName() + " " + clazz.getName() + "." + name); |
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424 } |
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425 |
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426 public static void main(Class<?> classToRun, String[] args) { |
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427 try { |
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428 final Method mainMethod = classToRun.getMethod("main", String[].class); |
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429 mainMethod.invoke(null, (Object) args); |
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430 } catch (Exception e) { |
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431 throw (Error) new Error().initCause(e); |
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432 } |
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433 } |
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434 |
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435 public static void main(String classToRun, String[] args) { |
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436 main(forName(classToRun), args); |
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437 } |
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|
438 |
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439 } |