Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/entry/EntrySleeveImpl.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.util.logging.Logger; |
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4 |
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5 import org.dancres.struct.LinkedInstance; |
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6 |
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7 import org.dancres.blitz.mangler.MangledEntry; |
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8 import org.dancres.blitz.mangler.EntryMangler; |
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9 |
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10 import org.dancres.blitz.oid.OID; |
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11 import org.dancres.blitz.oid.OIDFactory; |
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12 |
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13 import org.dancres.blitz.cache.Identifiable; |
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14 import org.dancres.blitz.cache.Identifier; |
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15 |
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16 import org.dancres.blitz.test.DummyEntry; |
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17 |
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18 import org.dancres.blitz.Logging; |
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19 import org.dancres.blitz.entry.ci.CacheIndexer; |
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20 |
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21 /** |
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22 <p> The in-memory representation of an Entry (as in record sleeve) - |
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23 includes transient caching state as well as persistent information. </p> |
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24 |
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25 <p> Call flatten to render an instance into a byte[] suitable for disk |
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26 storage and invoke the constructor EntrySleeveImpl(byte[]) to reconstitute |
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27 the flattened form from disk. </p> |
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28 |
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29 <p>We track dirty state explicitly on the sleeve and it's managed in the |
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30 layers above the WriteBuffer which only concerns itself with PersistentEntry |
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31 instances and getting them to disk.</p> |
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32 */ |
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33 final class EntrySleeveImpl implements EntrySleeve, Identifiable, |
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34 LinkedInstance { |
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35 |
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36 static final Logger theLogger = |
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37 Logging.newLogger("org.dancres.blitz.entry.EntrySleeveImpl"); |
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38 |
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39 private transient SleeveState theState = new SleeveState(); |
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40 |
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41 private transient LinkedInstance theNext; |
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42 private transient LinkedInstance thePrev; |
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43 |
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44 private transient PersistentEntry theEntry; |
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45 |
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46 private transient boolean isDirty; |
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47 |
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48 private EntrySleeveImpl() { |
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49 } |
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50 |
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51 /** |
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52 Use this constructor ONLY for EntrySleeveImpls that have never been |
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53 written to disk. Typically this constructor is called for |
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54 space::write() or recovery processing. |
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55 */ |
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56 EntrySleeveImpl(OID anId, MangledEntry anEntry, long anExpiry) { |
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57 theEntry = new PersistentEntry(anId, anEntry, anExpiry); |
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58 getState().set(SleeveState.NOT_ON_DISK | SleeveState.PINNED); |
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59 } |
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60 |
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61 /** |
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62 Take a byte[] as returned by flatten and re-constitute an |
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63 EntrySleeveImpl from it. Use this constructor for rebuilding state |
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64 saved to disk. |
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65 */ |
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66 EntrySleeveImpl(byte[] aBytes) { |
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67 theEntry = new PersistentEntry(aBytes); |
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68 } |
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69 |
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70 EntrySleeveImpl(PersistentEntry anEntry) { |
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71 theEntry = anEntry; |
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72 } |
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73 |
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74 /** |
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75 @return a deep duplicate of this EntrySleeveImpl, including current |
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76 SleeveState |
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77 */ |
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78 EntrySleeveImpl duplicate() { |
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79 EntrySleeveImpl myDupe = new EntrySleeveImpl(); |
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80 |
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81 // Copy status flags |
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82 myDupe.getState().set(getState().get()); |
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83 |
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84 myDupe.theEntry = new PersistentEntry(theEntry.flatten()); |
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85 |
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86 return myDupe; |
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87 } |
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88 |
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89 byte[] flatten() { |
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90 return theEntry.flatten(); |
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91 } |
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92 |
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93 SleeveState getState() { |
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94 synchronized(this) { |
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95 if (theState == null) |
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96 theState = new SleeveState(); |
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97 } |
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98 |
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99 return theState; |
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100 } |
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101 |
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102 public boolean isDeleted() { |
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103 return getState().test(SleeveState.DELETED); |
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104 } |
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105 |
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106 boolean hasExpired(long aTime) { |
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107 return theEntry.hasExpired(aTime); |
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108 } |
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109 |
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110 void setExpiry(long anExpiry) { |
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111 theEntry.setExpiry(anExpiry); |
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112 } |
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113 |
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114 long getExpiry() { |
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115 return theEntry.getExpiry(); |
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116 } |
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117 |
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118 public int getHashCodeForField(int anOffset) { |
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119 return theEntry.getHashCodeForField(anOffset); |
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120 } |
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121 |
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122 byte[] getKey() { |
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123 return theEntry.getKey(); |
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124 } |
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125 |
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126 public void setNext(LinkedInstance anInstance) { |
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127 theNext = anInstance; |
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128 } |
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129 |
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130 public void setPrev(LinkedInstance anInstance) { |
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131 thePrev = anInstance; |
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132 } |
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133 |
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134 public LinkedInstance getNext() { |
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135 return theNext; |
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136 } |
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137 |
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138 public LinkedInstance getPrev() { |
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139 return thePrev; |
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140 } |
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141 |
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142 /** |
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143 Ensure we only ever hand out one ID whilst we are cached so, should |
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144 someone wish to WeakRef the ID, it can. Id will be re-constituted |
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145 from key only when we've been reloaded from disk causing theId to |
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146 be null and flatten to have converted theId to a key made of bytes held |
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147 in theKey. |
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148 */ |
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149 public OID getOID() { |
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150 return theEntry.getOID(); |
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151 } |
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152 |
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153 public Identifier getId() { |
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154 return getOID(); |
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155 } |
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156 |
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157 public String getType() { |
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158 return getEntry().getType(); |
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159 } |
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160 |
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161 public MangledEntry getEntry() { |
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162 return theEntry.getEntry(); |
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163 } |
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164 |
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165 public boolean equals(Object anObject) { |
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166 if (anObject instanceof EntrySleeveImpl) { |
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167 EntrySleeveImpl myOther = (EntrySleeveImpl) anObject; |
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168 |
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169 return myOther.getOID().equals(getOID()); |
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170 } |
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171 |
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172 return false; |
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173 } |
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174 |
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175 public String toString() { |
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176 return "ES: " + getOID() + " - state: " + getState().toString(); |
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177 |
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178 } |
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179 |
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180 void markDirty() { |
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181 isDirty = true; |
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182 |
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183 if (isDeleted()) { |
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184 CacheIndexer.getIndexer(getType()).flushed(this); |
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185 } |
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186 } |
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187 |
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188 void clearDirty() { |
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189 isDirty = false; |
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190 } |
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191 |
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192 boolean isDirty() { |
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193 return isDirty; |
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194 } |
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195 |
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196 public static void main(String args[]) { |
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197 try { |
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198 EntryMangler myMangler = EntryMangler.getMangler(); |
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199 |
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200 DummyEntry myEntry = new DummyEntry("rhubarb"); |
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201 |
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202 MangledEntry myMangled = myMangler.mangle(myEntry); |
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203 |
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204 EntrySleeveImpl mySleeve = |
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205 new EntrySleeveImpl(OIDFactory.newOID(10, 21), myMangled, |
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206 Long.MAX_VALUE); |
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207 |
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208 byte[] myFlatten = mySleeve.flatten(); |
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209 |
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210 mySleeve = new EntrySleeveImpl(myFlatten); |
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211 |
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212 System.out.println(mySleeve.getEntry()); |
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213 |
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214 System.out.println(mySleeve.getOID()); |
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215 |
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216 mySleeve = new EntrySleeveImpl(myFlatten); |
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217 |
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218 mySleeve = mySleeve.duplicate(); |
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219 |
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220 myFlatten = mySleeve.flatten(); |
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221 |
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222 mySleeve = new EntrySleeveImpl(myFlatten); |
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223 |
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224 System.out.println(mySleeve.getEntry()); |
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225 |
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226 System.out.println(mySleeve.getOID()); |
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227 |
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228 } catch (Exception anE) { |
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229 anE.printStackTrace(System.err); |
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230 } |
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231 } |
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232 |
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233 PersistentEntry getPersistentRep() { |
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234 return theEntry; |
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235 } |
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236 } |