Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/mangler/MangledEntry.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 27ca8522be85 |
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1 package org.dancres.blitz.mangler; |
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2 |
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3 import java.io.*; |
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4 |
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5 import com.sun.jini.proxy.MarshalledWrapper; |
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6 import java.util.Collection; |
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7 import java.util.Iterator; |
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8 import net.jini.entry.AbstractEntry; |
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9 import net.jini.io.ObjectStreamContext; |
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10 import net.jini.io.context.IntegrityEnforcement; |
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11 |
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12 /** |
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13 <p>Represents a packaged up Entry ready for unpacking or passing to the |
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14 server for matching. We include null fields as well so as to ensure |
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15 we have a complete, ordered, list of fields which allows as to build |
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16 a composite hash to speed searching under some circumstances.</p> |
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17 |
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18 <p>Integrity checking starts here. If MangledEntry detects that integrity |
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19 checking was active when it was unpacked from the stream (see |
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20 <code>readObject()</code> in this class) it makes a note of the fact. |
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21 Later, this is interrogated by EntryMangler (see |
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22 <code>needsIntegrityCheck</code>) and handled accordingly.</p> |
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23 |
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24 @todo Fix up disk usage on null template match - see NULL_TEMPLATE |
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25 */ |
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26 public class MangledEntry implements Externalizable, net.jini.core.entry.Entry { |
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27 |
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28 static final long serialVersionUID = 462890915488647301L; |
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29 |
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30 private String[] theParents; |
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31 private MangledField[] theFields; |
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32 private String theType; |
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33 private String theCodebase; |
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34 private boolean isWildcard; |
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35 private boolean isSnapshot; |
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36 |
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37 /** |
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38 * Set to <code>true</code> in <code>readExternal</code> method |
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39 * (called when we're deserialized). When we unpack the contents using |
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40 * EntryMangler, we check this flag and perform integrity checks if |
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41 * required. |
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42 */ |
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43 private transient boolean checkIntegrity = false; |
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44 |
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45 /** |
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46 * As all entry instances are ultimately rooted at java.lang.Object we |
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47 * can simply search from java.lang.Object downwards when we receive |
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48 * a null-template query. This will cause a little extra disk I/O but |
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49 * nevermind for now. |
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50 */ |
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51 public static final MangledEntry NULL_TEMPLATE = |
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52 new MangledEntry("java.lang.Object", null, new MangledField[0], |
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53 new String[0], true); |
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54 |
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55 static boolean integrityEnforced(ObjectInput aStream) { |
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56 if (aStream instanceof ObjectStreamContext) { |
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57 Collection ctx = |
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58 ((ObjectStreamContext) aStream).getObjectStreamContext(); |
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59 for (Iterator i = ctx.iterator(); i.hasNext();) { |
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60 Object obj = i.next(); |
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61 if (obj instanceof IntegrityEnforcement) { |
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62 return ((IntegrityEnforcement) obj).integrityEnforced(); |
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63 } |
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64 } |
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65 } |
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66 |
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67 return false; |
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68 } |
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69 |
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70 public MangledEntry() { |
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71 |
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72 } |
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73 |
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74 MangledEntry(String aType, String aCodebase, |
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75 MangledField[] aListOfFields, String[] aListOfParents, |
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76 boolean doWildcard) { |
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77 this(aType, aCodebase, aListOfFields, aListOfParents, |
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78 doWildcard, false); |
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79 } |
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80 |
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81 MangledEntry(String aType, String aCodebase, |
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82 MangledField[] aListOfFields, String[] aListOfParents, |
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83 boolean doWildcard, boolean doSnapshot) { |
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84 theType = aType; |
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85 theCodebase = aCodebase; |
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86 theFields = aListOfFields; |
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87 theParents = aListOfParents; |
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88 isWildcard = doWildcard; |
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89 isSnapshot = doSnapshot; |
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90 } |
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91 |
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92 public void writeExternal(ObjectOutput objectOutput) throws IOException { |
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93 objectOutput.writeObject(theParents); |
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94 objectOutput.writeInt(theFields.length); |
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95 for (int i = 0; i < theFields.length; i++) { |
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96 objectOutput.writeInt(theFields[i].getContent().length); |
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97 objectOutput.writeInt(theFields[i].getAnnotations().length); |
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98 objectOutput.write(theFields[i].getContent()); |
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99 objectOutput.write(theFields[i].getAnnotations()); |
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100 objectOutput.writeUTF(theFields[i].getName()); |
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101 objectOutput.writeInt(theFields[i].hashCode()); |
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102 } |
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103 |
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104 objectOutput.writeUTF(theType); |
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105 objectOutput.writeUTF((theCodebase == null) ? "" : theCodebase); |
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106 objectOutput.writeBoolean(isWildcard); |
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107 objectOutput.writeBoolean(isSnapshot); |
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108 } |
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109 |
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110 public void readExternal(ObjectInput objectInput) throws IOException, |
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111 ClassNotFoundException { |
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112 |
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113 checkIntegrity = integrityEnforced(objectInput); |
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114 theParents = (String[]) objectInput.readObject(); |
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115 theFields = new MangledField[objectInput.readInt()]; |
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116 |
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117 for (int i = 0; i < theFields.length; i++) { |
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118 int myObjectSize = objectInput.readInt(); |
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119 int myAnnotSize = objectInput.readInt(); |
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120 |
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121 byte[] myContent = new byte[myObjectSize]; |
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122 byte[] myAnnot = new byte[myAnnotSize]; |
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123 |
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124 objectInput.readFully(myContent); |
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125 objectInput.readFully(myAnnot); |
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126 |
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127 theFields[i] = new MangledField(objectInput.readUTF(), |
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128 myContent, myAnnot, objectInput.readInt()); |
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129 } |
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130 |
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131 theType = objectInput.readUTF(); |
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132 String myCodebase = objectInput.readUTF(); |
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133 theCodebase = (myCodebase.length() == 0) ? null : myCodebase; |
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134 isWildcard = objectInput.readBoolean(); |
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135 isSnapshot = objectInput.readBoolean(); |
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136 } |
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137 |
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138 public int sizeOf() { |
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139 int myFieldTotal = 0; |
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140 |
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141 for (int i = 0; i < theFields.length; i++) { |
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142 myFieldTotal += theFields[i].sizeOf(); |
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143 } |
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144 |
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145 int myParentsTotal = 0; |
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146 |
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147 for (int i = 0; i < theParents.length; i++) { |
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148 myParentsTotal += theParents[i].length(); |
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149 } |
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150 |
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151 int myCodebaseLength = 0; |
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152 |
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153 if (theCodebase != null) |
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154 myCodebaseLength = theCodebase.length(); |
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155 |
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156 return theType.length() + myCodebaseLength + 4 + myParentsTotal + |
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157 myFieldTotal; |
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158 } |
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159 |
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160 /** |
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161 * In the case of a template, this indicates that none of it's fields |
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162 * have specific values so any match will do. |
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163 */ |
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164 public boolean isWildcard() { |
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165 return isWildcard; |
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166 } |
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167 |
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168 public String[] tearOffParents() { |
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169 return theParents; |
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170 } |
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171 |
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172 public MangledField[] getFields() { |
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173 return theFields; |
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174 } |
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175 |
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176 public MangledField getField(int anOffset) { |
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177 return theFields[anOffset]; |
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178 } |
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179 |
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180 public String getType() { |
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181 return theType; |
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182 } |
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183 |
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184 public String getCodebase() { |
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185 return theCodebase; |
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186 } |
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187 |
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188 public int getNumFields() { |
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189 return theFields.length; |
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190 } |
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191 |
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192 public boolean isSnapshot() { |
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193 return isSnapshot; |
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194 } |
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195 |
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196 /** |
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197 * @param anEntry the Entry to test against. The instance on which this |
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198 * method is called is implicitly treated as the template. |
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199 */ |
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200 public boolean match(MangledEntry anEntry) { |
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201 if (isWildcard) |
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202 return true; |
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203 |
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204 MangledField[] myEntryFields = anEntry.getFields(); |
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205 |
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206 for (int i = 0; i < theFields.length; i++) { |
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207 if (!theFields[i].isNull()) { |
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208 if (!theFields[i].matches(myEntryFields[i])) |
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209 return false; |
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210 } |
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211 } |
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212 |
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213 return true; |
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214 } |
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215 |
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216 public int hashCode() { |
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217 int myHash = 0; |
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218 |
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219 for (int i = 0; i < theFields.length; i++) { |
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220 myHash ^= theFields[i].hashCode(); |
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221 } |
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222 |
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223 return myHash; |
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224 } |
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225 |
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226 public boolean equals(Object anObject) { |
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227 if (anObject instanceof MangledEntry) { |
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228 MangledEntry myOther = (MangledEntry) anObject; |
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229 |
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230 if (myOther.theType.equals(theType)) { |
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231 return match(myOther); |
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232 } |
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233 } |
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234 |
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235 return false; |
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236 } |
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237 |
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238 public void dump(PrintStream aStream) { |
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239 aStream.println("Type: " + theType); |
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240 aStream.println("Codebase: " + theCodebase); |
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241 aStream.print("Parents: "); |
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242 |
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243 if (theParents != null) { |
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244 for (int i = 0; i < theParents.length; i++) { |
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245 aStream.print(theParents[i] + ", "); |
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246 } |
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247 aStream.println(); |
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248 } |
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249 |
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250 aStream.println("Fields:"); |
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251 for (int i = 0; i < theFields.length; i++) { |
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252 aStream.println(" " + theFields[i].getName() + ": " + |
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253 theFields[i].hashCode()); |
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254 } |
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255 } |
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256 |
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257 boolean needsIntegrityCheck() { |
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258 return checkIntegrity; |
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259 } |
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260 |
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261 public net.jini.core.entry.Entry get() |
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262 throws net.jini.core.entry.UnusableEntryException { |
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263 return EntryMangler.getMangler().unMangle(this); |
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264 } |
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265 |
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266 public net.jini.core.entry.Entry getSnapshot() { |
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267 return this; |
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268 } |
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269 |
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270 |
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271 public String toString() { |
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272 String myEntryRep = "Unusable"; |
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273 |
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274 try { |
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275 myEntryRep = |
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276 AbstractEntry.toString( |
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277 EntryMangler.getMangler().unMangle(this)); |
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278 } catch (Exception anE) { |
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279 // Nothing to do |
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280 myEntryRep = myEntryRep + ": " + anE.getClass(); |
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281 } |
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282 |
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283 return myEntryRep; |
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284 } |
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285 } |