1 | /** @file GS2LuceneEditor.java
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2 | *
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3 | * Provides a wrapper to the index/document editing features of Lucene.
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4 | *
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5 | * This java application makes use of the existing Lucene class IndexModifier
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6 | * to access and make changes to the information stored about documents in a
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7 | * Lucene database. This is an essential component of the IncrementalBuilder
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8 | * PERL module, and endevours to make editing the text and metadata of
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9 | * documents without having to rebuild the entire collection a reality (in
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10 | * other words, true incremental/dynamic building).
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11 | *
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12 | * A component of the Greenstone digital library software from the New Zealand
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13 | * Digital Library Project at the University of Waikato, New Zealand.
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14 | *
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15 | * This program is free software; you can redistribute it and/or modify it
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16 | * under the terms of the GNU General Public License as published by the Free
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17 | * Software Foundation; either version 2 of the License, or (at your option)
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18 | * any later version.
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19 | *
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20 | * This program is distributed in the hope that it will be useful, but WITHOUT
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21 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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23 | * more details.
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24 | *
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25 | * You should have received a copy of the GNU General Public License along
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26 | * with this program; if not, write to the Free Software Foundation, Inc., 675
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27 | * Mass Ave, Cambridge, MA 02139, USA.
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28 | *
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29 | * Copyright (c) 2006 DL Consulting Ltd., New Zealand
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30 | */
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31 |
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32 | package org.greenstone.LuceneWrapper;
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33 |
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34 | import java.io.IOException;
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35 | import java.util.Arrays;
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36 | import java.util.Enumeration;
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37 | import java.util.Vector;
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38 |
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39 | import org.apache.lucene.analysis.Analyzer;
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40 | import org.apache.lucene.analysis.standard.StandardAnalyzer;
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41 | import org.apache.lucene.document.Document;
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42 | import org.apache.lucene.document.Field;
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43 |
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44 |
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45 | /** Contains methods for modifying a document that has previously been indexed
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46 | * into a Lucene database.
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47 | * @author John Thompson, DL Consulting Ltd.
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48 | */
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49 | public class GS2LuceneEditor
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50 | {
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51 | /** This is the main entry point to the editor and is responsible for
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52 | * parsing the arguments and creating an instance of the editor class.
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53 | *
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54 | * @param args The arguments passed into the application as a string
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55 | * array
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56 | * @return An integer describing the exit state of the application
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57 | * @throws Exception on any fatal error state
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58 | *
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59 | * @author John Thompson, DL Consulting Ltd.
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60 | */
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61 | static public void main (String args[])
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62 | throws Exception
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63 | {
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64 | // Parse arguments
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65 | int node_id = -1;
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66 | String field = "";
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67 | String index_path = "";
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68 | String new_value = "";
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69 | String old_value = "";
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70 |
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71 | for (int i = 0; i < args.length; i += 2)
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72 | {
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73 | if (args[i].equals("--index"))
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74 | {
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75 | index_path = args[i + 1];
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76 | }
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77 | else if (args[i].equals("--nodeid"))
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78 | {
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79 | String temp = args[i + 1];
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80 | node_id = Integer.parseInt(temp);
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81 | temp = null; // Off to the gc with you!
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82 | }
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83 | else if (args[i].equals("--field"))
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84 | {
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85 | field = args[i + 1];
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86 | }
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87 | else if (args[i].equals("--oldvalue"))
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88 | {
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89 | old_value = args[i + 1];
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90 | }
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91 | else if (args[i].equals("--newvalue"))
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92 | {
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93 | new_value = args[i + 1];
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94 | }
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95 | else
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96 | {
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97 | System.out.println("Error! Unknown argument: " + args[i]);
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98 | GS2LuceneEditor.printUsage();
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99 | }
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100 | }
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101 |
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102 | // Check arguments
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103 | if(index_path.equals(""))
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104 | {
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105 | System.out.println("Error! Missing index path");
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106 | GS2LuceneEditor.printUsage();
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107 | }
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108 | if(field.equals(""))
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109 | {
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110 | System.out.println("Error! Missing field");
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111 | GS2LuceneEditor.printUsage();
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112 | }
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113 | if(node_id == -1)
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114 | {
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115 | System.out.println("Error! Missing or invalid Node ID");
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116 | GS2LuceneEditor.printUsage();
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117 | }
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118 | if(old_value.equals("") && new_value.equals(""))
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119 | {
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120 | System.out.println("Error! No modification requested");
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121 | GS2LuceneEditor.printUsage();
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122 | }
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123 |
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124 |
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125 | // Instantiate editor, and perform the edit
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126 | GS2LuceneEditor editor = new GS2LuceneEditor(index_path);
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127 | editor.editIndex(node_id, field, old_value, new_value);
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128 | editor.destroy();
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129 | editor = null;
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130 | }
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131 | /** main() **/
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132 |
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133 | /** **/
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134 | private boolean debug = true;
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135 |
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136 | /** **/
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137 | private GS2IndexModifier index_modifier;
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138 |
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139 | /** Constructor which takes the path to the Lucene index to be edited.
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140 | *
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141 | * @param index_path The full path to the index directory as a String
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142 | *
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143 | * @author John Thompson, DL Consulting Ltd.
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144 | */
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145 | public GS2LuceneEditor(String index_path)
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146 | throws IOException
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147 | {
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148 | Analyzer analyzer = new StandardAnalyzer();
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149 | // create an index in /tmp/index, overwriting an existing one:
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150 | index_modifier = new GS2IndexModifier(index_path, analyzer);
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151 | }
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152 | /** GS2LuceneEditor **/
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153 |
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154 | /**
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155 | */
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156 | public void debug(String message)
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157 | {
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158 | if(debug)
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159 | {
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160 | System.err.println(message);
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161 | }
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162 | }
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163 | /** debug() **/
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164 |
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165 | /** Destructor which unallocates connection to Lucene.
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166 | */
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167 | public void destroy()
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168 | throws IOException
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169 | {
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170 | index_modifier.close();
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171 | index_modifier = null;
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172 | }
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173 |
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174 | /** Make an edit to a Lucene index.
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175 | *
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176 | * @param oid The unique identifier of a Lucene document as an
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177 | * integer
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178 | * @param field The field to be modified as a String
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179 | * @param old_value The existing value to be changed or removed as a
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180 | * String
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181 | * @param old_value The replacement value to be changed or added as a
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182 | * String
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183 | *
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184 | * @author John Thompson, DL Consulting Ltd.
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185 | */
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186 | public void editIndex(int node_id, String field, String old_value, String new_value)
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187 | throws IOException
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188 | {
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189 | debug("GS2LuceneEditor.editIndex(" + node_id + ",'" + field + "','" + old_value + "','" + new_value + "')");
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190 | debug("- Initial number of documents in index: " + index_modifier.docCount());
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191 | // Retrieve the document requested
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192 | int doc_num = index_modifier.getDocNumByNodeID(node_id);
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193 | if (doc_num != -1)
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194 | {
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195 | debug("* Found document #" + doc_num);
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196 | // Retrieve the actual document
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197 | Document document = index_modifier.document(doc_num);
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198 | // Remove the document from the index before modifying
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199 | index_modifier.deleteDocument(doc_num);
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200 | debug("* Removed document from index prior to editing");
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201 | // Retrieve the requested fields values, and turn it into a
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202 | // vector
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203 | debug("* Modifying the value of the field: " + field);
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204 | doEdit(document, field, old_value, new_value);
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205 |
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206 | // We have to do a similar modification to the ZZ field
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207 | // too
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208 | debug("* Modifying the value of the field: ZZ");
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209 | doEdit(document, "ZZ", old_value, new_value);
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210 |
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211 | // Re-index document
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212 | index_modifier.addDocument(document);
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213 | debug("* Reindexing modified document");
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214 | }
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215 | else
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216 | {
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217 | debug("- No such document!");
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218 | Document document = new Document();
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219 |
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220 | // Retrieve the requested fields values, and turn it into a
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221 | // vector
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222 | debug("* Adding the value to the field: " + field);
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223 | doEdit(document, field, old_value, new_value);
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224 |
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225 | // We have to do a similar modification to the ZZ field
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226 | // too
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227 | debug("* Adding the value to the field: ZZ");
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228 | doEdit(document, "ZZ", old_value, new_value);
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229 |
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230 | // We also have to initialize the nodeId value
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231 | document.add(new Field("nodeID", String.valueOf(node_id), Field.Store.YES, Field.Index.TOKENIZED));
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232 |
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233 | // Re-index document
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234 | index_modifier.addDocument(document);
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235 | debug("* Indexing new document");
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236 | }
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237 |
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238 |
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239 | }
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240 | /** editIndex() **/
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241 |
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242 | /**
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243 | */
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244 | protected void doEdit(Document document, String field, String old_value, String new_value)
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245 | {
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246 | if (debug)
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247 | {
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248 | debug("GS2LuceneEditor.doEdit(Document, \"" + field + "\", \"" + old_value + "\", \"" + new_value + "\")");
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249 | }
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250 |
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251 | String values_raw[] = document.getValues(field);
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252 | if(values_raw != null)
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253 | {
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254 | Vector values = new Vector(Arrays.asList(values_raw));
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255 | // Remove all the values for this field (no other safe way to
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256 | // do this
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257 | document.removeFields(field);
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258 | // DEBUG
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259 | if (debug)
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260 | {
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261 | debug("- Before modification:");
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262 | for(int i = 0; i < values.size(); i++)
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263 | {
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264 | debug("\t" + field + "[" + i + "]: " + values.get(i));
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265 | }
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266 | }
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267 | // If old_value is set, remove it from the values array
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268 | if(!old_value.equals(""))
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269 | {
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270 | // Remove all occurances of this metadata - this means
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271 | // it becomes a bit dangerous to have multiple pieces
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272 | // of metadata with exactly the same metadata - but
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273 | // this is only for indexing purposes so its not so
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274 | // bad.
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275 | while(values.contains(old_value))
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276 | {
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277 | values.remove(old_value);
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278 | }
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279 | }
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280 | // If new_value is set, add it to the values array
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281 | if(!new_value.equals("") && !values.contains(new_value))
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282 | {
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283 | values.add(new_value);
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284 | }
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285 | // DEBUG
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286 | if(debug)
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287 | {
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288 | debug("- After modification:");
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289 | for(int i = 0; i < values.size(); i++)
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290 | {
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291 | debug("\t" + field + "[" + i + "]: " + values.get(i));
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292 | }
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293 | }
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294 | // Add all the values for this field
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295 | for(int i = 0; i < values.size(); i++)
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296 | {
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297 | document.add(new Field(field, (String)values.get(i), Field.Store.YES, Field.Index.TOKENIZED));
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298 | }
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299 | values.clear();
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300 | values = null;
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301 | }
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302 | // We may be adding a value to a field that current has no values
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303 | else if (!new_value.equals(""))
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304 | {
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305 | Vector values = new Vector();
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306 | values.add(new_value);
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307 | // DEBUG
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308 | if(debug)
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309 | {
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310 | debug("- Brand spanking new values:");
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311 | for(int i = 0; i < values.size(); i++)
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312 | {
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313 | debug("\t" + field + "[" + i + "]: " + values.get(i));
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314 | }
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315 | }
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316 | // Add all the values for this field
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317 | for(int i = 0; i < values.size(); i++)
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318 | {
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319 | document.add(new Field(field, (String)values.get(i), Field.Store.YES, Field.Index.TOKENIZED));
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320 | }
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321 | values.clear();
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322 | values = null;
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323 | }
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324 | // Can't do a removal unless something exists
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325 | else
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326 | {
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327 | debug("- No such field for this document: " + field);
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328 | }
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329 | values_raw = null;
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330 | }
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331 | /** doEdit() **/
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332 |
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333 | /**
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334 | */
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335 | static public void printUsage()
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336 | {
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337 | System.out.println("usage: GS2LuceneEditor --index <path> --nodeid <int> --field <string>");
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338 | System.out.println(" [--oldvalue <string>] [--newvalue <string>]");
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339 | System.out.println("");
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340 | System.out.println("where:");
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341 | System.out.println(" index - is the full path to the directory containing the directory");
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342 | System.out.println(" to edit, including the level (ie didx, sidx)");
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343 | System.out.println(" nodeid - the unique identifier of the document to change. This is the");
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344 | System.out.println(" same as the docnum in the GDBM");
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345 | System.out.println(" field - the two letter code of the metadata field to edit. These can");
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346 | System.out.println(" found in the build.cfg file. ZZ is not a valid field as it");
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347 | System.out.println(" is handled as a special case");
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348 | System.out.println(" oldvalue - the current value of the metadata field if it is to be");
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349 | System.out.println(" replaced or removed");
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350 | System.out.println(" newvalue - the new value for the metadata field if it is to be replaced");
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351 | System.out.println(" or added");
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352 | System.out.println("");
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353 | System.exit(0);
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354 | }
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355 | /** printUsage() **/
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356 |
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357 | }
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358 | /** class GS2LuceneEditor **/
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