1 /* |
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2 * Copyright 2003-2006 Sun Microsystems, Inc. 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. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package com.sun.beans; |
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27 |
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28 import com.sun.beans.finder.ClassFinder; |
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29 |
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30 import java.beans.*; |
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31 import java.util.*; |
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32 |
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33 import org.xml.sax.*; |
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34 |
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35 import static java.util.Locale.ENGLISH; |
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36 |
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37 /** |
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38 * <b>WARNING</b>: This class is an implementation detail and only meant |
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39 * for use within the core platform. You should NOT depend upon it! This |
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40 * API may change drastically between dot dot release, and it may even be |
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41 * removed. |
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42 * |
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43 * @see java.beans.XMLEncoder |
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44 * @see java.io.ObjectInputStream |
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45 * |
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46 * @since 1.4 |
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47 * |
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48 * @author Philip Milne |
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49 */ |
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50 public class ObjectHandler extends HandlerBase { |
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51 |
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52 public static Class typeNameToClass(String typeName) { |
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53 typeName = typeName.intern(); |
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54 if (typeName == "boolean") return Boolean.class; |
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55 if (typeName == "byte") return Byte.class; |
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56 if (typeName == "char") return Character.class; |
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57 if (typeName == "short") return Short.class; |
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58 if (typeName == "int") return Integer.class; |
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59 if (typeName == "long") return Long.class; |
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60 if (typeName == "float") return Float.class; |
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61 if (typeName == "double") return Double.class; |
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62 if (typeName == "void") return Void.class; |
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63 return null; |
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64 } |
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65 |
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66 public static Class typeNameToPrimitiveClass(String typeName) { |
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67 typeName = typeName.intern(); |
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68 if (typeName == "boolean") return boolean.class; |
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69 if (typeName == "byte") return byte.class; |
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70 if (typeName == "char") return char.class; |
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71 if (typeName == "short") return short.class; |
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72 if (typeName == "int") return int.class; |
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73 if (typeName == "long") return long.class; |
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74 if (typeName == "float") return float.class; |
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75 if (typeName == "double") return double.class; |
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76 if (typeName == "void") return void.class; |
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77 return null; |
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78 } |
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79 |
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80 /** |
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81 * Returns the <code>Class</code> object associated with |
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82 * the class or interface with the given string name, |
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83 * using the default class loader. |
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84 * |
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85 * @param name fully qualified name of the desired class |
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86 * @param cl class loader from which the class must be loaded |
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87 * @return class object representing the desired class |
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88 * |
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89 * @exception ClassNotFoundException if the class cannot be located |
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90 * by the specified class loader |
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91 * |
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92 * @deprecated As of JDK version 7, replaced by |
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93 * {@link ClassFinder#resolveClass(String)}. |
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94 */ |
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95 @Deprecated |
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96 public static Class classForName(String name) throws ClassNotFoundException { |
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97 return ClassFinder.resolveClass(name); |
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98 } |
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99 |
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100 /** |
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101 * Returns the <code>Class</code> object associated with |
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102 * the class or interface with the given string name, |
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103 * using the given class loader. |
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104 * |
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105 * @param name fully qualified name of the desired class |
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106 * @param cl class loader from which the class must be loaded |
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107 * @return class object representing the desired class |
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108 * |
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109 * @exception ClassNotFoundException if the class cannot be located |
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110 * by the specified class loader |
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111 * |
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112 * @deprecated As of JDK version 7, replaced by |
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113 * {@link ClassFinder#resolveClass(String,ClassLoader)}. |
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114 */ |
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115 @Deprecated |
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116 public static Class classForName(String name, ClassLoader cl) |
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117 throws ClassNotFoundException { |
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118 return ClassFinder.resolveClass(name, cl); |
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119 } |
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120 |
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121 private Hashtable environment; |
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122 private Vector expStack; |
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123 private StringBuffer chars; |
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124 private XMLDecoder is; |
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125 private ClassLoader ldr; |
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126 private int itemsRead = 0; |
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127 private boolean isString; |
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128 |
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129 public ObjectHandler() { |
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130 environment = new Hashtable(); |
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131 expStack = new Vector(); |
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132 chars = new StringBuffer(); |
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133 } |
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134 |
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135 public ObjectHandler(XMLDecoder is) { |
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136 this(); |
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137 this.is = is; |
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138 } |
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139 |
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140 /* loader can be null */ |
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141 public ObjectHandler(XMLDecoder is, ClassLoader loader) { |
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142 this(is); |
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143 this.ldr = loader; |
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144 } |
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145 |
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146 |
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147 public void reset() { |
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148 expStack.clear(); |
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149 chars.setLength(0); |
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150 MutableExpression e = new MutableExpression(); |
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151 e.setTarget(classForName2("java.lang.Object")); |
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152 e.setMethodName("null"); |
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153 expStack.add(e); |
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154 } |
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155 |
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156 private Object getValue(Expression exp) { |
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157 try { |
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158 return exp.getValue(); |
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159 } |
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160 catch (Exception e) { |
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161 if (is != null) { |
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162 is.getExceptionListener().exceptionThrown(e); |
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163 } |
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164 return null; |
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165 } |
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166 } |
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167 |
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168 private void addArg(Object arg) { |
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169 lastExp().addArg(arg); |
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170 } |
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171 |
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172 private Object pop(Vector v) { |
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173 int last = v.size()-1; |
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174 Object result = v.get(last); |
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175 v.remove(last); |
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176 return result; |
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177 } |
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178 |
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179 private Object eval() { |
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180 return getValue(lastExp()); |
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181 } |
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182 |
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183 private MutableExpression lastExp() { |
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184 return (MutableExpression)expStack.lastElement(); |
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185 } |
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186 |
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187 public Object dequeueResult() { |
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188 Object[] results = lastExp().getArguments(); |
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189 return results[itemsRead++]; |
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190 } |
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191 |
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192 private boolean isPrimitive(String name) { |
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193 return name != "void" && typeNameToClass(name) != null; |
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194 } |
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195 |
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196 private void simulateException(String message) { |
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197 Exception e = new Exception(message); |
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198 e.fillInStackTrace(); |
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199 if (is != null) { |
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200 is.getExceptionListener().exceptionThrown(e); |
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201 } |
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202 } |
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203 |
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204 private Class classForName2(String name) { |
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205 try { |
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206 return ClassFinder.resolveClass(name, this.ldr); |
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207 } |
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208 catch (ClassNotFoundException e) { |
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209 if (is != null) { |
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210 is.getExceptionListener().exceptionThrown(e); |
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211 } |
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212 } |
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213 return null; |
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214 } |
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215 |
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216 private HashMap getAttributes(AttributeList attrs) { |
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217 HashMap attributes = new HashMap(); |
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218 if (attrs != null && attrs.getLength() > 0) { |
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219 for(int i = 0; i < attrs.getLength(); i++) { |
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220 attributes.put(attrs.getName(i), attrs.getValue(i)); |
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221 } |
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222 } |
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223 return attributes; |
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224 } |
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225 |
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226 public void startElement(String name, AttributeList attrs) throws SAXException { |
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227 name = name.intern(); // Xerces parser does not supply unique tag names. |
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228 if (this.isString) { |
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229 parseCharCode(name, getAttributes(attrs)); |
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230 return; |
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231 } |
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232 chars.setLength(0); |
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233 |
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234 HashMap attributes = getAttributes(attrs); |
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235 MutableExpression e = new MutableExpression(); |
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236 |
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237 // Target |
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238 String className = (String)attributes.get("class"); |
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239 if (className != null) { |
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240 e.setTarget(classForName2(className)); |
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241 } |
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242 |
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243 // Property |
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244 Object property = attributes.get("property"); |
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245 String index = (String)attributes.get("index"); |
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246 if (index != null) { |
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247 property = new Integer(index); |
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248 e.addArg(property); |
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249 } |
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250 e.setProperty(property); |
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251 |
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252 // Method |
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253 String methodName = (String)attributes.get("method"); |
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254 if (methodName == null && property == null) { |
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255 methodName = "new"; |
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256 } |
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257 e.setMethodName(methodName); |
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258 |
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259 // Tags |
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260 if (name == "string") { |
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261 e.setTarget(String.class); |
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262 e.setMethodName("new"); |
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263 this.isString = true; |
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264 } |
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265 else if (isPrimitive(name)){ |
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266 Class wrapper = typeNameToClass(name); |
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267 e.setTarget(wrapper); |
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268 e.setMethodName("new"); |
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269 parseCharCode(name, attributes); |
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270 } |
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271 else if (name == "class") { |
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272 e.setTarget(Class.class); |
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273 e.setMethodName("forName"); |
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274 } |
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275 else if (name == "null") { |
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276 // Create an arbitrary expression that has a value of null - for |
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277 // consistency. |
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278 e.setTarget(Object.class); |
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279 e.setMethodName("getSuperclass"); |
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280 e.setValue(null); |
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281 } |
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282 else if (name == "void") { |
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283 if (e.getTarget() == null) { // this check is for "void class="foo" method= ..." |
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284 e.setTarget(eval()); |
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285 } |
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286 } |
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287 else if (name == "array") { |
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288 // The class attribute means sub-type for arrays. |
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289 String subtypeName = (String)attributes.get("class"); |
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290 Class subtype = (subtypeName == null) ? Object.class : classForName2(subtypeName); |
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291 String length = (String)attributes.get("length"); |
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292 if (length != null) { |
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293 e.setTarget(java.lang.reflect.Array.class); |
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294 e.addArg(subtype); |
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295 e.addArg(new Integer(length)); |
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296 } |
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297 else { |
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298 Class arrayClass = java.lang.reflect.Array.newInstance(subtype, 0).getClass(); |
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299 e.setTarget(arrayClass); |
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300 } |
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301 } |
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302 else if (name == "java") { |
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303 e.setValue(is); // The outermost scope is the stream itself. |
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304 } |
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305 else if (name == "object") { |
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306 } |
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307 else { |
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308 simulateException("Unrecognized opening tag: " + name + " " + attrsToString(attrs)); |
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309 return; |
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310 } |
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311 |
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312 // ids |
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313 String idName = (String)attributes.get("id"); |
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314 if (idName != null) { |
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315 environment.put(idName, e); |
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316 } |
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317 |
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318 // idrefs |
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319 String idrefName = (String)attributes.get("idref"); |
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320 if (idrefName != null) { |
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321 e.setValue(lookup(idrefName)); |
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322 } |
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323 |
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324 // fields |
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325 String fieldName = (String)attributes.get("field"); |
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326 if (fieldName != null) { |
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327 e.setValue(getFieldValue(e.getTarget(), fieldName)); |
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328 } |
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329 expStack.add(e); |
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330 } |
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331 |
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332 private Object getFieldValue(Object target, String fieldName) { |
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333 try { |
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334 Class type = target.getClass(); |
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335 if (type == Class.class) { |
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336 type = (Class)target; |
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337 } |
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338 java.lang.reflect.Field f = sun.reflect.misc.FieldUtil.getField(type, fieldName); |
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339 return f.get(target); |
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340 } |
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341 catch (Exception e) { |
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342 if (is != null) { |
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343 is.getExceptionListener().exceptionThrown(e); |
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344 } |
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345 return null; |
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346 } |
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347 } |
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348 |
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349 private String attrsToString(AttributeList attrs) { |
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350 StringBuffer b = new StringBuffer(); |
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351 for (int i = 0; i < attrs.getLength (); i++) { |
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352 b.append(attrs.getName(i)+"=\""+attrs.getValue(i)+"\" "); |
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353 } |
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354 return b.toString(); |
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355 } |
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356 |
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357 public void characters(char buf [], int offset, int len) throws SAXException { |
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358 chars.append(new String(buf, offset, len)); |
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359 } |
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360 |
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361 private void parseCharCode(String name, Map map) { |
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362 if (name == "char") { |
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363 String value = (String) map.get("code"); |
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364 if (value != null) { |
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365 int code = Integer.decode(value); |
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366 for (char ch : Character.toChars(code)) { |
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367 this.chars.append(ch); |
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368 } |
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369 } |
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370 } |
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371 } |
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372 |
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373 public Object lookup(String s) { |
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374 Expression e = (Expression)environment.get(s); |
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375 if (e == null) { |
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376 simulateException("Unbound variable: " + s); |
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377 } |
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378 return getValue(e); |
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379 } |
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380 |
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381 public void register(String id, Object value) { |
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382 Expression e = new MutableExpression(); |
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383 e.setValue(value); |
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384 environment.put(id, e); |
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385 } |
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386 |
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387 public void endElement(String name) throws SAXException { |
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388 name = name.intern(); // Xerces parser does not supply unique tag names. |
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389 if (name == "string") { |
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390 this.isString = false; |
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391 } else if (this.isString) { |
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392 return; |
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393 } |
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394 if (name == "java") { |
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395 return; |
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396 } |
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397 if (isPrimitive(name) || name == "string" || name == "class") { |
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398 addArg(chars.toString()); |
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399 } |
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400 if (name == "object" || name == "array" || name == "void" || |
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401 isPrimitive(name) || name == "string" || name == "class" || |
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402 name == "null") { |
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403 Expression e = (Expression)pop(expStack); |
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404 Object value = getValue(e); |
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405 if (name != "void") { |
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406 addArg(value); |
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407 } |
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408 } |
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409 else { |
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410 simulateException("Unrecognized closing tag: " + name); |
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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 |
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416 class MutableExpression extends Expression { |
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417 private Object target; |
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418 private String methodName; |
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419 |
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420 private Object property; |
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421 private Vector argV = new Vector(); |
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422 |
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423 private String capitalize(String propertyName) { |
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424 if (propertyName.length() == 0) { |
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425 return propertyName; |
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426 } |
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427 return propertyName.substring(0, 1).toUpperCase(ENGLISH) + propertyName.substring(1); |
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428 } |
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429 |
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430 public MutableExpression() { |
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431 super(null, null, null); |
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432 } |
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433 |
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434 public Object[] getArguments() { |
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435 return argV.toArray(); |
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436 } |
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437 |
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438 public String getMethodName() { |
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439 if (property == null) { |
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440 return methodName; |
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441 } |
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442 int setterArgs = (property instanceof String) ? 1 : 2; |
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443 String methodName = (argV.size() == setterArgs) ? "set" : "get"; |
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444 if (property instanceof String) { |
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445 return methodName + capitalize((String)property); |
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446 } |
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447 else { |
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448 return methodName; |
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449 } |
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450 } |
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451 |
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452 public void addArg(Object arg) { |
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453 argV.add(arg); |
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454 } |
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455 |
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456 public void setTarget(Object target) { |
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457 this.target = target; |
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458 } |
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459 |
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460 public Object getTarget() { |
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461 return target; |
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462 } |
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463 |
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464 public void setMethodName(String methodName) { |
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465 this.methodName = methodName; |
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466 } |
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467 |
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468 public void setProperty(Object property) { |
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469 this.property = property; |
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470 } |
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471 |
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472 public void setValue(Object value) { |
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473 super.setValue(value); |
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474 } |
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475 |
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476 public Object getValue() throws Exception { |
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477 return super.getValue(); |
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478 } |
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479 } |
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