Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/mangler/MangledField.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
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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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Dan Creswell <dan.creswell@gmail.com>
parents:
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135
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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136 byte[] getContent() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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137 return theObjectBytes;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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138 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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139
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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140 byte[] getAnnotations() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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141 return theAnnotationBytes;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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142 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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143
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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144 public int hashCode() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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145 return theHashCode;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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146 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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147 }