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annotate src/org/eclipse/jetty/util/IntrospectionUtil.java @ 815:07c82fabc46b

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author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 09 Sep 2016 14:27:05 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 import java.lang.reflect.Field;
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22 import java.lang.reflect.Member;
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23 import java.lang.reflect.Method;
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24 import java.lang.reflect.Modifier;
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25 import java.util.Arrays;
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26 import java.util.List;
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27
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28 /**
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29 * IntrospectionUtil
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30 *
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31 *
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32 */
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33 public class IntrospectionUtil
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34 {
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35
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36 public static boolean isJavaBeanCompliantSetter (Method method)
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37 {
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38 if (method == null)
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39 return false;
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40
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41 if (method.getReturnType() != Void.TYPE)
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42 return false;
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43
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44 if (!method.getName().startsWith("set"))
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45 return false;
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46
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47 if (method.getParameterTypes().length != 1)
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48 return false;
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49
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50 return true;
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51 }
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52
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53 public static Method findMethod (Class<?> clazz, String methodName, Class<?>[] args, boolean checkInheritance, boolean strictArgs)
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54 throws NoSuchMethodException
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55 {
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56 if (clazz == null)
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57 throw new NoSuchMethodException("No class");
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58 if (methodName==null || methodName.trim().equals(""))
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59 throw new NoSuchMethodException("No method name");
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60
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61 Method method = null;
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62 Method[] methods = clazz.getDeclaredMethods();
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63 for (int i=0;i<methods.length && method==null;i++)
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64 {
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65 if (methods[i].getName().equals(methodName) && checkParams(methods[i].getParameterTypes(), (args==null?new Class[] {}:args), strictArgs))
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66 {
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67 method = methods[i];
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68 }
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69
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70 }
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71 if (method!=null)
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72 {
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73 return method;
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74 }
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75 else if (checkInheritance)
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76 return findInheritedMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, args, strictArgs);
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77 else
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78 throw new NoSuchMethodException("No such method "+methodName+" on class "+clazz.getName());
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79
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80 }
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81
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82
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83
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84
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85
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86 public static Field findField (Class<?> clazz, String targetName, Class<?> targetType, boolean checkInheritance, boolean strictType)
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87 throws NoSuchFieldException
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88 {
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89 if (clazz == null)
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90 throw new NoSuchFieldException("No class");
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91 if (targetName==null)
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92 throw new NoSuchFieldException("No field name");
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93
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94 try
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95 {
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96 Field field = clazz.getDeclaredField(targetName);
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97 if (strictType)
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98 {
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99 if (field.getType().equals(targetType))
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100 return field;
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101 }
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102 else
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103 {
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104 if (field.getType().isAssignableFrom(targetType))
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105 return field;
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106 }
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107 if (checkInheritance)
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108 {
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109 return findInheritedField(clazz.getPackage(), clazz.getSuperclass(), targetName, targetType, strictType);
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110 }
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111 else
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112 throw new NoSuchFieldException("No field with name "+targetName+" in class "+clazz.getName()+" of type "+targetType);
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113 }
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114 catch (NoSuchFieldException e)
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115 {
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116 return findInheritedField(clazz.getPackage(),clazz.getSuperclass(), targetName,targetType,strictType);
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117 }
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118 }
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119
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120
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121
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122
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123
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124 public static boolean isInheritable (Package pack, Member member)
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125 {
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126 if (pack==null)
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127 return false;
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128 if (member==null)
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129 return false;
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130
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131 int modifiers = member.getModifiers();
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132 if (Modifier.isPublic(modifiers))
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133 return true;
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134 if (Modifier.isProtected(modifiers))
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135 return true;
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136 if (!Modifier.isPrivate(modifiers) && pack.equals(member.getDeclaringClass().getPackage()))
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137 return true;
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138
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139 return false;
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140 }
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141
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142
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143
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144
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145 public static boolean checkParams (Class<?>[] formalParams, Class<?>[] actualParams, boolean strict)
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146 {
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147 if (formalParams==null)
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148 return actualParams==null;
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149 if (actualParams==null)
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150 return false;
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151
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152 if (formalParams.length!=actualParams.length)
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153 return false;
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154
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155 if (formalParams.length==0)
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156 return true;
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157
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158 int j=0;
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159 if (strict)
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160 {
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161 while (j<formalParams.length && formalParams[j].equals(actualParams[j]))
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162 j++;
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163 }
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164 else
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165 {
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166 while ((j<formalParams.length) && (formalParams[j].isAssignableFrom(actualParams[j])))
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167 {
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168 j++;
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169 }
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170 }
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171
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172 if (j!=formalParams.length)
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173 {
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174 return false;
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175 }
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176
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177 return true;
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178 }
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179
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180
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181 public static boolean isSameSignature (Method methodA, Method methodB)
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182 {
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183 if (methodA==null)
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184 return false;
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185 if (methodB==null)
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186 return false;
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187
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188 List<Class<?>> parameterTypesA = Arrays.asList(methodA.getParameterTypes());
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189 List<Class<?>> parameterTypesB = Arrays.asList(methodB.getParameterTypes());
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190
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191 if (methodA.getName().equals(methodB.getName())
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192 &&
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193 parameterTypesA.containsAll(parameterTypesB))
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194 return true;
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195
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196 return false;
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197 }
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198
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199 public static boolean isTypeCompatible (Class<?> formalType, Class<?> actualType, boolean strict)
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200 {
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201 if (formalType==null)
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202 return actualType==null;
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203 if (actualType==null)
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204 return false;
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205
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206 if (strict)
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207 return formalType.equals(actualType);
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208 else
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209 return formalType.isAssignableFrom(actualType);
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210 }
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211
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212
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213
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214
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215 public static boolean containsSameMethodSignature (Method method, Class<?> c, boolean checkPackage)
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216 {
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217 if (checkPackage)
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218 {
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219 if (!c.getPackage().equals(method.getDeclaringClass().getPackage()))
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220 return false;
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221 }
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222
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223 boolean samesig = false;
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224 Method[] methods = c.getDeclaredMethods();
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225 for (int i=0; i<methods.length && !samesig; i++)
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226 {
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227 if (IntrospectionUtil.isSameSignature(method, methods[i]))
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228 samesig = true;
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229 }
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230 return samesig;
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231 }
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232
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233
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234 public static boolean containsSameFieldName(Field field, Class<?> c, boolean checkPackage)
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235 {
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236 if (checkPackage)
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237 {
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238 if (!c.getPackage().equals(field.getDeclaringClass().getPackage()))
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239 return false;
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240 }
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241
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242 boolean sameName = false;
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243 Field[] fields = c.getDeclaredFields();
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244 for (int i=0;i<fields.length && !sameName; i++)
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245 {
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246 if (fields[i].getName().equals(field.getName()))
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247 sameName = true;
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248 }
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249 return sameName;
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250 }
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251
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252
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253
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254 protected static Method findInheritedMethod (Package pack, Class<?> clazz, String methodName, Class<?>[] args, boolean strictArgs)
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255 throws NoSuchMethodException
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256 {
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257 if (clazz==null)
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258 throw new NoSuchMethodException("No class");
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259 if (methodName==null)
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260 throw new NoSuchMethodException("No method name");
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261
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262 Method method = null;
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263 Method[] methods = clazz.getDeclaredMethods();
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264 for (int i=0;i<methods.length && method==null;i++)
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265 {
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266 if (methods[i].getName().equals(methodName)
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267 && isInheritable(pack,methods[i])
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268 && checkParams(methods[i].getParameterTypes(), args, strictArgs))
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269 method = methods[i];
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270 }
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271 if (method!=null)
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272 {
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273 return method;
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274 }
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275 else
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276 return findInheritedMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, args, strictArgs);
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277 }
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278
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279 protected static Field findInheritedField (Package pack, Class<?> clazz, String fieldName, Class<?> fieldType, boolean strictType)
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280 throws NoSuchFieldException
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281 {
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282 if (clazz==null)
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283 throw new NoSuchFieldException ("No class");
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284 if (fieldName==null)
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285 throw new NoSuchFieldException ("No field name");
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286 try
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287 {
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288 Field field = clazz.getDeclaredField(fieldName);
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289 if (isInheritable(pack, field) && isTypeCompatible(fieldType, field.getType(), strictType))
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290 return field;
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291 else
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292 return findInheritedField(clazz.getPackage(), clazz.getSuperclass(),fieldName, fieldType, strictType);
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293 }
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294 catch (NoSuchFieldException e)
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295 {
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296 return findInheritedField(clazz.getPackage(), clazz.getSuperclass(),fieldName, fieldType, strictType);
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297 }
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298 }
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299
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300 }