Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/mangler/MangledField.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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.ByteArrayOutputStream; |
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4 import java.io.ByteArrayInputStream; |
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5 import java.io.IOException; |
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6 import java.io.Serializable; |
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7 |
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8 import org.dancres.io.AnnotatingObjectOutputStream; |
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9 import org.dancres.io.AnnotatingObjectInputStream; |
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10 |
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11 /** |
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12 Each field within an Entry is held in a MangledField. We require the |
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13 field's name for indexing purposes. We also use our own hashing |
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14 algorithm which is known not to "funnel" in the vast majority of cases. |
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15 */ |
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16 public class MangledField implements Serializable { |
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17 static final long serialVersionUID = -6256197142057463399L; |
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18 |
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19 private String theName; |
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20 private byte[] theObjectBytes; |
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21 private byte[] theAnnotationBytes; |
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22 private int theHashCode; |
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23 |
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24 MangledField(String aName) { |
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25 theName = aName; |
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26 theObjectBytes = new byte[0]; |
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27 theAnnotationBytes = new byte[0]; |
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28 theHashCode = 0; |
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29 } |
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30 |
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31 MangledField(String aName, Object anObject) |
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32 throws IOException { |
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33 theName = aName; |
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34 mangle(anObject); |
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35 } |
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36 |
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37 MangledField(String aName, byte[] anObject, byte[] aAnnotation, int aHash) { |
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38 theName = aName; |
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39 theObjectBytes = anObject; |
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40 theAnnotationBytes = aAnnotation; |
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41 theHashCode = aHash; |
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42 } |
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43 |
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44 public int sizeOf() { |
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45 if (isNull()) |
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46 return 0; |
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47 else |
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48 return theName.length() + theObjectBytes.length + |
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49 theAnnotationBytes.length + 4 + 4; |
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50 } |
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51 |
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52 public Object unMangle(ClassLoader aDefault, boolean checkIntegrity) |
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53 throws IOException, ClassNotFoundException { |
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54 |
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55 ByteArrayInputStream myObjStream = |
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56 new ByteArrayInputStream(theObjectBytes); |
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57 ByteArrayInputStream myAnnoStream = |
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58 new ByteArrayInputStream(theAnnotationBytes); |
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59 |
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60 AnnotatingObjectInputStream myStream = |
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61 new AnnotatingObjectInputStream(aDefault, myObjStream, |
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62 myAnnoStream, checkIntegrity); |
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63 |
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64 Object myResult = myStream.readObject(); |
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65 |
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66 myStream.close(); |
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67 |
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68 return myResult; |
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69 } |
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70 |
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71 public boolean isNull() { |
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72 // System.err.println("isNull: " + theName); |
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73 // System.err.println("OLength: " + theObjectBytes.length); |
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74 // System.err.println("ALength: " + theAnnotationBytes.length); |
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75 return (theObjectBytes.length == 0); |
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76 } |
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77 |
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78 private void mangle(Object anObject) throws IOException { |
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79 ByteArrayOutputStream myObjectBytes = new ByteArrayOutputStream(); |
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80 ByteArrayOutputStream myAnnotBytes = new ByteArrayOutputStream(); |
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81 |
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82 AnnotatingObjectOutputStream myStream = |
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83 new AnnotatingObjectOutputStream(myObjectBytes, myAnnotBytes); |
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84 |
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85 myStream.writeObject(anObject); |
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86 myStream.close(); |
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87 |
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88 theObjectBytes = myObjectBytes.toByteArray(); |
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89 theAnnotationBytes = myAnnotBytes.toByteArray(); |
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90 |
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91 theHashCode = buildHash(theObjectBytes); |
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92 } |
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93 |
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94 /** |
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95 This algorithm is based on the "One at a time" hash published in |
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96 Dr Dobbs Journal '97 and authored by Bob Jenkins. A copy of the |
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97 article can be found at |
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98 <a href="http://burtleburtle.net/bob/hash/doobs.html"> |
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99 Burtleburtle.net</a> |
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100 */ |
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101 private int buildHash(byte[] aBytes) { |
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102 int myHash = 0; |
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103 |
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104 for (int i = 0; i < aBytes.length; i++) { |
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105 myHash += aBytes[i]; |
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106 myHash += (myHash << 10); |
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107 myHash ^= (myHash >> 6); |
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108 } |
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109 |
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110 myHash += (myHash << 3); |
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111 myHash ^= (myHash >> 11); |
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112 myHash += (myHash << 15); |
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113 |
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114 return myHash; |
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115 } |
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116 |
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117 public boolean matches(MangledField aField) { |
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118 if (aField.theHashCode == theHashCode) { |
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119 if (aField.theObjectBytes.length == theObjectBytes.length) { |
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120 for (int i = 0; i < theObjectBytes.length; i++) { |
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121 if (aField.theObjectBytes[i] != theObjectBytes[i]) |
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122 return false; |
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123 } |
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124 |
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125 return true; |
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126 } |
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127 } |
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128 |
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129 return false; |
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130 } |
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131 |
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132 public String getName() { |
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133 return theName; |
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134 } |
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135 |
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136 byte[] getContent() { |
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137 return theObjectBytes; |
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138 } |
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139 |
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140 byte[] getAnnotations() { |
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141 return theAnnotationBytes; |
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142 } |
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143 |
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144 public int hashCode() { |
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145 return theHashCode; |
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146 } |
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147 } |