Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/mangler/EntryMangler.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.mangler; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.rmi.server.RMIClassLoader; |
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6 |
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7 import java.lang.reflect.Field; |
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8 import java.lang.reflect.Modifier; |
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9 |
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10 import java.util.ArrayList; |
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11 import java.util.Arrays; |
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12 import java.util.Comparator; |
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13 |
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14 import java.util.WeakHashMap; |
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15 import java.util.Map; |
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16 |
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17 import java.util.logging.Logger; |
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18 import java.util.logging.Level; |
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19 |
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20 import net.jini.core.entry.Entry; |
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21 import net.jini.core.entry.UnusableEntryException; |
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22 |
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23 import net.jini.loader.ClassLoading; |
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24 |
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25 /** |
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26 This class takes an Entry instance and reduces it down into it's |
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27 constituent parts (MangledEntry) which can be stored in the server-side. |
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28 |
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29 @todo Hints about the kind of indexing for an Entry type are an |
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30 interesting idea - sometimes we're dealing with a queue, sometimes |
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31 hashing and sometimes neither. We could achieve it with a simple |
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32 static field with a fixed name and a possible set of values. Non-standard |
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33 but interesting......We could even set a default of indexed so we can |
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34 implement it and do something sane by default but possibly more optimal |
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35 with a hint. |
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36 |
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37 @todo Consider adding test for Entry being a public class with a public |
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38 no-args constructor |
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39 */ |
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40 public class EntryMangler { |
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41 private static final Logger theLogger = |
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42 Logger.getLogger("org.dancres.blitz.mangler.EntryMangler"); |
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43 |
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44 private static final int INVALID_MODIFIERS = Modifier.TRANSIENT | |
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45 Modifier.STATIC | Modifier.FINAL; |
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46 |
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47 private static final Comparator theFieldSorter = new FieldSorter(); |
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48 |
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49 private static EntryMangler theMangler = new EntryMangler(); |
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50 |
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51 public static EntryMangler getMangler() { |
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52 return theMangler; |
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53 } |
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54 |
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55 /** |
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56 DEBUG AND TESTING ONLY |
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57 */ |
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58 public EntryMangler() { |
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59 } |
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60 |
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61 public MangledEntry mangle(Entry anEntry) { |
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62 return mangle(anEntry, false); |
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63 } |
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64 |
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65 /** |
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66 * @param isSnapshot indicates whether this mangle is for a snapshot operation on |
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67 * a template Entry |
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68 */ |
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69 public MangledEntry mangle(Entry anEntry, boolean isSnapshot) { |
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70 Class myEntryClass = anEntry.getClass(); |
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71 String myClassName = myEntryClass.getName(); |
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72 String myCodebase = RMIClassLoader.getClassAnnotation(myEntryClass); |
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73 |
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74 MangledField[] myEntryFields = getFields(anEntry); |
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75 String[] myParents = getParents(myEntryClass); |
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76 |
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77 // Is it wildcard - i.e. all fields are null |
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78 boolean isWildcard = true; |
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79 for (int i = 0; i < myEntryFields.length; i++) { |
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80 if (! myEntryFields[i].isNull()) { |
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81 isWildcard = false; |
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82 break; |
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83 } |
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84 } |
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85 |
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86 return new MangledEntry(myClassName, myCodebase, myEntryFields, |
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87 myParents, isWildcard, isSnapshot); |
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88 } |
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89 |
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90 public Entry unMangle(MangledEntry anME) throws UnusableEntryException { |
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91 try { |
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92 Class myEntryClass = |
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93 ClassLoading.loadClass(anME.getCodebase(), anME.getType(), |
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94 null, anME.needsIntegrityCheck(), null); |
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95 |
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96 Entry myEntry = (Entry) myEntryClass.newInstance(); |
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97 |
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98 Field[] myFields = getFields(myEntryClass); |
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99 |
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100 MangledField[] myMangledFields = anME.getFields(); |
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101 int myNextField = 0; |
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102 |
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103 for (int i = 0; i < myFields.length; i++) { |
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104 if (theLogger.isLoggable(Level.FINEST)) { |
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105 theLogger.finest("Looking at field: " + |
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106 myFields[i].getName()); |
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107 theLogger.finest("Valid:" + |
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108 myMangledFields[myNextField]); |
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109 theLogger.finest("Hash: " + |
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110 myMangledFields[myNextField].hashCode()); |
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111 } |
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112 if (! myMangledFields[myNextField].isNull()) { |
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113 if (theLogger.isLoggable(Level.FINEST)) { |
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114 theLogger.finest("Not null"); |
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115 theLogger.finest("Copy from: " + |
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116 myMangledFields[myNextField].getName()); |
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117 theLogger.finest("Value will be: " + |
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118 myMangledFields[myNextField].unMangle(null, |
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119 anME.needsIntegrityCheck())); |
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120 } |
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121 myFields[i].set(myEntry, |
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122 myMangledFields[myNextField++].unMangle(null, |
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123 anME.needsIntegrityCheck())); |
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124 } else |
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125 myNextField++; |
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126 } |
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127 |
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128 return myEntry; |
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129 } catch (Exception anE) { |
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130 theLogger.log(Level.SEVERE, "Error during unpack: ", anE); |
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131 throw new UnusableEntryException(anE); |
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132 } |
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133 } |
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134 |
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135 private static Map theParentsCache = new WeakHashMap(); |
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136 |
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137 private String[] getParents(Class aClass) { |
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138 String[] myParents = null; |
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139 |
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140 synchronized(theParentsCache) { |
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141 myParents = (String[]) theParentsCache.get(aClass); |
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142 |
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143 if (myParents == null) { |
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144 ArrayList mySuperClasses = new ArrayList(); |
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145 |
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146 for(Class myCurrentClass = aClass.getSuperclass(); |
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147 myCurrentClass != null; |
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148 myCurrentClass = myCurrentClass.getSuperclass()) { |
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149 |
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150 mySuperClasses.add(myCurrentClass.getName()); |
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151 } |
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152 |
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153 myParents = new String[mySuperClasses.size()]; |
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154 Object[] myClasses = mySuperClasses.toArray(); |
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155 System.arraycopy(myClasses, 0, myParents, 0, myParents.length); |
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156 |
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157 theParentsCache.put(aClass, myParents); |
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158 } |
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159 } |
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160 |
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161 return myParents; |
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162 } |
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163 |
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164 /** |
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165 We wish to sort fields into order with those of super-class before |
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166 subclass. We're using alphabetical order for fields within one |
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167 particular class but, in reality, any predicatable ordering would do. |
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168 */ |
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169 private static class FieldSorter implements Comparator { |
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170 public int compare(Object anObject, Object anotherObject) { |
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171 Field myFirst = (Field) anObject; |
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172 Field mySecond = (Field) anotherObject; |
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173 |
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174 if (myFirst == mySecond) |
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175 return 0; |
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176 else if (myFirst.getDeclaringClass() == |
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177 mySecond.getDeclaringClass()) { |
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178 return myFirst.getName().compareTo(mySecond.getName()); |
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179 } else if (myFirst.getDeclaringClass().isAssignableFrom(mySecond.getDeclaringClass())) { |
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180 return -1; |
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181 } else { |
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182 return 1; |
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183 } |
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184 } |
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185 } |
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186 |
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187 private static Map theFieldCache = new WeakHashMap(); |
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188 |
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189 private Field[] getFields(Class aClass) { |
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190 synchronized(theFieldCache) { |
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191 Field[] myFields = (Field[]) theFieldCache.get(aClass); |
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192 |
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193 if (myFields == null) { |
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194 myFields = aClass.getFields(); |
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195 Arrays.sort(myFields, theFieldSorter); |
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196 |
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197 ArrayList myRelevant = new ArrayList(); |
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198 |
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199 for (int i = 0; i < myFields.length; i++) { |
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200 if (isValid(myFields[i])) |
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201 myRelevant.add(myFields[i]); |
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202 } |
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203 |
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204 myFields = new Field[myRelevant.size()]; |
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205 myFields = (Field[]) myRelevant.toArray(myFields); |
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206 theFieldCache.put(aClass, myFields); |
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207 } |
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208 |
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209 return myFields; |
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210 } |
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211 } |
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212 |
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213 private MangledField[] getFields(Entry anEntry) { |
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214 Field[] myFields = getFields(anEntry.getClass()); |
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215 |
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216 MangledField[] myValidFields = |
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217 new MangledField[myFields.length]; |
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218 |
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219 int i = 0; |
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220 try { |
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221 for (i = 0; i < myFields.length; i++) { |
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222 Object myFieldValue = myFields[i].get(anEntry); |
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223 String myFieldName = myFields[i].getName(); |
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224 |
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225 if (myFieldValue == null) |
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226 myValidFields[i] = |
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227 new MangledField(myFieldName); |
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228 else |
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229 myValidFields[i] = |
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230 new MangledField(myFieldName, myFieldValue); |
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231 } |
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232 } catch (IllegalAccessException anIAE) { |
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233 theLogger.log(Level.SEVERE, "Problem accessing field", anIAE); |
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234 throw new InternalError("Couldn't access field: " + myFields[i]); |
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235 } catch (IOException anIOE) { |
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236 theLogger.log(Level.SEVERE, "Fatal error", anIOE); |
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237 throw new InternalError("Fatal error: " + anIOE); |
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238 } |
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239 |
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240 return myValidFields; |
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241 } |
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242 |
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243 private boolean isValid(Field aField) { |
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244 if ((aField.getModifiers() & INVALID_MODIFIERS) != 0) |
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245 return false; |
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246 |
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247 if (aField.getType().isPrimitive()) |
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248 return false; |
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249 |
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250 return true; |
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251 } |
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252 } |