[29148] | 1 | /** @file GS2LuceneDelete.java
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| 2 | *
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| 3 | * Provides a wrapper to the document deleting features of Lucene.
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| 4 | *
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| 5 | * This java application no longer makes use of the long-deprecated
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| 6 | * existing Lucene class IndexModifier
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| 7 | * to access and make changes to the information stored about documents in a
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| 8 | * Lucene database. This is an essential component of the IncrementalBuilder
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| 9 | * PERL module, and endevours to make editing the text and metadata of
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| 10 | * documents without having to rebuild the entire collection a reality (in
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| 11 | * other words, true incremental/dynamic building).
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| 12 | *
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| 13 | * A component of the Greenstone digital library software from the New Zealand
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| 14 | * Digital Library Project at the University of Waikato, New Zealand.
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| 15 | *
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| 16 | * This program is free software; you can redistribute it and/or modify it
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| 17 | * under the terms of the GNU General Public License as published by the Free
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| 18 | * Software Foundation; either version 2 of the License, or (at your option)
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| 19 | * any later version.
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| 20 | *
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| 21 | * This program is distributed in the hope that it will be useful, but WITHOUT
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| 22 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 23 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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| 24 | * more details.
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| 25 | *
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| 26 | * You should have received a copy of the GNU General Public License along
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| 27 | * with this program; if not, write to the Free Software Foundation, Inc., 675
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| 28 | * Mass Ave, Cambridge, MA 02139, USA.
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| 29 | *
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| 30 | * Copyright (c) 2006 DL Consulting Ltd., New Zealand
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| 31 | */
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| 32 |
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| 33 | package org.greenstone.LuceneWrapper4;
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| 34 |
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| 35 | import java.io.IOException;
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| 36 | //import org.apache.lucene.analysis.standard.StandardAnalyzer;
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| 37 | import org.apache.lucene.analysis.Analyzer;
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| 38 | import org.apache.lucene.index.IndexWriter;
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| 39 | import org.apache.lucene.index.Term;
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| 40 | import org.apache.lucene.util.Version;
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| 41 |
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| 42 | /** Contains methods for deleting a document that has previously been indexed
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| 43 | * into a Lucene database.
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| 44 | * @author John Thompson, DL Consulting Ltd. (unless stated otherwise)
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| 45 | */
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| 46 | public class GS2LuceneDelete
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| 47 | {
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| 48 | /** This is the main entry point to the deletor and is responsible for
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| 49 | * parsing the arguments and creating an instance of the deletor class.
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| 50 | *
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| 51 | * @param args The arguments passed into the application as a string
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| 52 | * array
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| 53 | * @return An integer describing the exit state of the application
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| 54 | * @throws Exception on any fatal error state
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| 55 | */
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| 56 | static public void main (String args[])
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| 57 | throws Exception
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| 58 | {
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| 59 | // Parse arguments
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| 60 | String index_path = "";
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| 61 | int node_id = -1;
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| 62 |
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| 63 | for (int i = 0; i < args.length; i += 2)
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| 64 | {
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| 65 | if (args[i].equals("--index"))
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| 66 | {
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| 67 | index_path = args[i + 1];
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| 68 | }
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| 69 | else if (args[i].equals("--nodeid"))
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| 70 | {
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| 71 | node_id = Integer.parseInt(args[i + 1]);
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| 72 | }
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| 73 | else
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| 74 | {
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| 75 | System.out.println("Error! Unknown argument: " + args[i]);
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| 76 | GS2LuceneDelete.printUsage();
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| 77 | System.exit(0);
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | // Check arguments
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| 82 | if (index_path.equals(""))
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| 83 | {
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| 84 | System.out.println("Error! Missing index path");
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| 85 | GS2LuceneDelete.printUsage();
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| 86 | System.exit(0);
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| 87 | }
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| 88 | if (node_id == -1)
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| 89 | {
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| 90 | System.out.println("Error! Missing or invalid Node ID");
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| 91 | GS2LuceneDelete.printUsage();
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| 92 | System.exit(0);
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| 93 | }
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| 94 |
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| 95 | // Instantiate deletor, and perform the delete
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| 96 | GS2LuceneDelete deletor = new GS2LuceneDelete(index_path);
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| 97 | deletor.deleteDocument(node_id);
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| 98 | deletor.destroy();
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| 99 | deletor = null;
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| 100 | }
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| 101 |
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| 102 |
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| 103 | /** Display program usage message.
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| 104 | */
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| 105 | static public void printUsage()
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| 106 | {
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| 107 | System.out.println("usage: GS2LuceneDelete --index <path> --nodeid <int>");
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| 108 | System.out.println("");
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| 109 | System.out.println("where:");
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| 110 | System.out.println(" index - is the full path to the directory containing the directory");
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| 111 | System.out.println(" to edit, including the level (ie didx, sidx)");
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| 112 | System.out.println(" nodeid - the unique identifier of the document to delete. This is the");
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| 113 | System.out.println(" same as the docnum in the GDBM");
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| 114 | System.out.println("");
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| 115 | }
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| 116 |
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| 117 |
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| 118 | /** **/
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| 119 | private boolean debug = true;
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| 120 |
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| 121 | /** **/
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| 122 | private IndexWriter index_writer = null;
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| 123 |
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| 124 |
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| 125 | /** Constructor which takes the path to the Lucene index to be edited.
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| 126 | *
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| 127 | * @param index_path The full path to the index directory as a String
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| 128 | */
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| 129 | public GS2LuceneDelete(String index_path)
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| 130 | throws IOException
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| 131 | {
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| 132 | index_writer = GSLuceneUtil.getIndexWriter(index_path);
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| 133 | }
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| 134 |
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| 135 |
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| 136 | /** When called prints a debug message but only if debugging is enabled.
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| 137 | */
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| 138 | public void debug(String message)
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| 139 | {
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| 140 | if (debug)
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| 141 | {
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| 142 | System.err.println(message);
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| 143 | }
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| 144 | }
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| 145 |
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| 146 |
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| 147 | /** Destructor which unallocates connection to Lucene.
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| 148 | */
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| 149 | public void destroy()
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| 150 | throws IOException
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| 151 | {
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| 152 | index_writer.close();
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| 153 | index_writer = null;
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| 154 | }
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| 155 |
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| 156 |
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| 157 | /** Delete the indicated document from the Lucene index. This process is
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| 158 | * very similar to the initial step of index editing.
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| 159 | *
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| 160 | * @param node_id The unique identifier of a Lucene document as an
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| 161 | * integer
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| 162 | */
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| 163 | public void deleteDocument(int node_id)
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| 164 | throws IOException
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| 165 | {
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| 166 | debug("GS2LuceneDelete.deleteDocument(" + node_id + ")");
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| 167 | debug("- Initial number of documents in index: " + index_writer.numDocs());
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| 168 | index_writer.deleteDocuments(new Term("nodeid", "" + node_id));
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| 169 | debug("- Final number of documents in index: " + index_writer.numDocs());
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| 170 | }
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| 171 | }
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