1 | /**
|
---|
2 | *
|
---|
3 | * @author [email protected]
|
---|
4 | * @author [email protected]
|
---|
5 | * @author [email protected]
|
---|
6 | * @author [email protected]
|
---|
7 | * @version
|
---|
8 | */
|
---|
9 |
|
---|
10 | package org.nzdl.gsdl.LuceneWrap;
|
---|
11 |
|
---|
12 |
|
---|
13 | import java.io.*;
|
---|
14 | import java.util.*;
|
---|
15 | import java.util.regex.*;
|
---|
16 |
|
---|
17 | import org.apache.lucene.analysis.Analyzer;
|
---|
18 | import org.apache.lucene.analysis.standard.StandardAnalyzer;
|
---|
19 | import org.apache.lucene.document.Document;
|
---|
20 | import org.apache.lucene.index.IndexReader;
|
---|
21 | import org.apache.lucene.index.Term;
|
---|
22 | import org.apache.lucene.index.TermDocs;
|
---|
23 | import org.apache.lucene.queryParser.ParseException;
|
---|
24 | import org.apache.lucene.queryParser.QueryParser;
|
---|
25 | import org.apache.lucene.search.BooleanQuery.TooManyClauses;
|
---|
26 | import org.apache.lucene.search.Filter;
|
---|
27 | import org.apache.lucene.search.Hit;
|
---|
28 | import org.apache.lucene.search.Hits;
|
---|
29 | import org.apache.lucene.search.IndexSearcher;
|
---|
30 | import org.apache.lucene.search.Query;
|
---|
31 | import org.apache.lucene.search.RangeFilter;
|
---|
32 | import org.apache.lucene.search.Searcher;
|
---|
33 | import org.apache.lucene.search.ScoreDoc;
|
---|
34 | import org.apache.lucene.search.Sort;
|
---|
35 | import org.apache.lucene.search.TopFieldDocs;
|
---|
36 |
|
---|
37 |
|
---|
38 | public class GS2LuceneQuery
|
---|
39 | {
|
---|
40 | static private String TEXTFIELD = "TX";
|
---|
41 |
|
---|
42 | // Use the standard set of English stop words by default
|
---|
43 | static private String[] stop_words = StandardAnalyzer.STOP_WORDS;
|
---|
44 |
|
---|
45 |
|
---|
46 | static public void main (String args[])
|
---|
47 | {
|
---|
48 | if (args.length == 0) {
|
---|
49 | System.out.println("Usage: GS2LuceneQuery <index directory> [-fuzziness value] [-filter filter_string] [-sort sort_field] [-dco AND|OR] [-startresults number -endresults number]");
|
---|
50 | return;
|
---|
51 | }
|
---|
52 |
|
---|
53 | try {
|
---|
54 | Searcher searcher = new IndexSearcher(args[0]);
|
---|
55 | IndexReader reader = ((IndexSearcher) searcher).getIndexReader();
|
---|
56 |
|
---|
57 | // Create one query parser with the standard set of stop words, and one with none
|
---|
58 | QueryParser query_parser = new QueryParser(TEXTFIELD, new StandardAnalyzer(stop_words));
|
---|
59 | QueryParser query_parser_no_stop_words = new QueryParser(TEXTFIELD, new StandardAnalyzer(new String[] { }));
|
---|
60 |
|
---|
61 | Sort sorter = new Sort();
|
---|
62 | Filter filter = null;
|
---|
63 | String fuzziness = null;
|
---|
64 |
|
---|
65 | // Paging
|
---|
66 | int start_results = 1;
|
---|
67 | int end_results = Integer.MAX_VALUE;
|
---|
68 |
|
---|
69 | // New code to allow the default conjunction operator to be
|
---|
70 | // definable
|
---|
71 | String default_conjuction_operator = "OR";
|
---|
72 | for (int i = 1; i < args.length; i++) {
|
---|
73 | if (args[i].equals("-sort")) {
|
---|
74 | i++;
|
---|
75 | sorter = new Sort(args[i]);
|
---|
76 | }
|
---|
77 | if (args[i].equals("-filter")) {
|
---|
78 | i++;
|
---|
79 | filter = parseFilterString(args[i]);
|
---|
80 | }
|
---|
81 | if (args[i].equals("-dco")) {
|
---|
82 | i++;
|
---|
83 | default_conjuction_operator = args[i];
|
---|
84 | }
|
---|
85 | if (args[i].equals("-fuzziness")) {
|
---|
86 | i++;
|
---|
87 | fuzziness = args[i];
|
---|
88 | }
|
---|
89 | if (args[i].equals("-startresults")) {
|
---|
90 | i++;
|
---|
91 | if (args[i].matches("\\d+")) {
|
---|
92 | start_results = Integer.parseInt(args[i]);
|
---|
93 | }
|
---|
94 | }
|
---|
95 | if (args[i].equals("-endresults")) {
|
---|
96 | i++;
|
---|
97 | if (args[i].matches("\\d+")) {
|
---|
98 | end_results = Integer.parseInt(args[i]);
|
---|
99 | }
|
---|
100 | }
|
---|
101 | }
|
---|
102 |
|
---|
103 | // Lucene does "OR" queries by default; do an "AND" query if specified
|
---|
104 | if (default_conjuction_operator.equals("AND")) {
|
---|
105 | query_parser.setDefaultOperator(query_parser.AND_OPERATOR);
|
---|
106 | query_parser_no_stop_words.setDefaultOperator(query_parser.AND_OPERATOR);
|
---|
107 | }
|
---|
108 |
|
---|
109 | BufferedReader in = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
|
---|
110 | while (true) {
|
---|
111 | // Read the query from STDIN
|
---|
112 | String query_string = in.readLine();
|
---|
113 | if (query_string == null || query_string.length() == -1) {
|
---|
114 | break;
|
---|
115 | }
|
---|
116 | System.out.println("<ResultSet>");
|
---|
117 | System.out.println(" <QueryString>" + xmlSafe(query_string) + "</QueryString>");
|
---|
118 | if (filter != null) {
|
---|
119 | System.out.println(" <FilterString>" + filter.toString() + "</FilterString>");
|
---|
120 | }
|
---|
121 |
|
---|
122 | try {
|
---|
123 | Query query_including_stop_words = parseQuery(reader, query_parser_no_stop_words, query_string, fuzziness);
|
---|
124 | query_including_stop_words = query_including_stop_words.rewrite(reader);
|
---|
125 |
|
---|
126 | Query query = parseQuery(reader, query_parser, query_string, fuzziness);
|
---|
127 | query = query.rewrite(reader);
|
---|
128 |
|
---|
129 | // Return the list of expanded query terms and their frequencies
|
---|
130 | HashSet terms = new HashSet();
|
---|
131 | query.extractTerms(terms);
|
---|
132 | Iterator term_iterator = terms.iterator();
|
---|
133 | System.out.println(" <QueryTermsInfo num=\"" + terms.size() + "\"/>");
|
---|
134 | while (term_iterator.hasNext()) {
|
---|
135 | Term term = (Term) term_iterator.next();
|
---|
136 |
|
---|
137 | // Get the term frequency over all the documents
|
---|
138 | TermDocs term_docs = reader.termDocs(term);
|
---|
139 | int term_freq = term_docs.freq();
|
---|
140 | while (term_docs.next()) {
|
---|
141 | term_freq += term_docs.freq();
|
---|
142 | }
|
---|
143 |
|
---|
144 | // If you wanted to limit this to just text terms add
|
---|
145 | // something like this:
|
---|
146 | // if (term.field().equals(TEXTFIELD))
|
---|
147 | System.out.println(" <Term value=\"" + term.text() + "\" field=\"" + term.field() + "\" freq=\"" + term_freq + "\" />");
|
---|
148 | }
|
---|
149 |
|
---|
150 | // Return the list of stop words removed from the query
|
---|
151 | HashSet terms_including_stop_words = new HashSet();
|
---|
152 | query_including_stop_words.extractTerms(terms_including_stop_words);
|
---|
153 | Iterator terms_including_stop_words_iter = terms_including_stop_words.iterator();
|
---|
154 | while (terms_including_stop_words_iter.hasNext()) {
|
---|
155 | Term term = (Term) terms_including_stop_words_iter.next();
|
---|
156 | if (!terms.contains(term)) {
|
---|
157 | System.out.println(" <StopWord value=\"" + term.text() + "\"/>");
|
---|
158 | }
|
---|
159 | }
|
---|
160 |
|
---|
161 | // Simple case for getting all the matching documents
|
---|
162 | if (end_results == Integer.MAX_VALUE) {
|
---|
163 | // Perform the query (filter and sorter may be null)
|
---|
164 | Hits hits = searcher.search(query, filter, sorter);
|
---|
165 | System.out.println(" <MatchingDocsInfo num=\"" + hits.length() + "\"/>");
|
---|
166 |
|
---|
167 | // Output the matching documents
|
---|
168 | System.out.println(" <StartResults num=\"" + start_results + "\" />");
|
---|
169 | System.out.println(" <EndsResults num=\"" + hits.length() + "\" />");
|
---|
170 | for (int i = start_results; i <= hits.length(); i++) {
|
---|
171 | Document doc = hits.doc(i - 1);
|
---|
172 | System.out.println(" <Match id=\"" + doc.get("nodeID") + "\" />");
|
---|
173 | }
|
---|
174 | }
|
---|
175 |
|
---|
176 | // Slightly more complicated case for returning a subset of the matching documents
|
---|
177 | else {
|
---|
178 | // Perform the query (filter may be null)
|
---|
179 | TopFieldDocs hits = searcher.search(query, filter, end_results, sorter);
|
---|
180 | System.out.println(" <MatchingDocsInfo num=\"" + hits.totalHits + "\"/>");
|
---|
181 |
|
---|
182 | // Output the matching documents
|
---|
183 | System.out.println(" <StartResults num=\"" + start_results + "\" />");
|
---|
184 | System.out.println(" <EndsResults num=\"" + end_results + "\" />");
|
---|
185 | for (int i = start_results; (i <= hits.scoreDocs.length && i <= end_results); i++) {
|
---|
186 | Document doc = reader.document(hits.scoreDocs[i - 1].doc);
|
---|
187 | System.out.println(" <Match id=\"" + doc.get("nodeID") + "\" />");
|
---|
188 | }
|
---|
189 | }
|
---|
190 | }
|
---|
191 | catch (ParseException parse_exception) {
|
---|
192 | System.out.println(" <Error type=\"PARSE_EXCEPTION\"/>");
|
---|
193 | }
|
---|
194 | catch (TooManyClauses too_many_clauses_exception) {
|
---|
195 | System.out.println(" <Error type=\"TOO_MANY_CLAUSES\"/>");
|
---|
196 | }
|
---|
197 |
|
---|
198 | System.out.println("</ResultSet>");
|
---|
199 | }
|
---|
200 |
|
---|
201 | searcher.close();
|
---|
202 | }
|
---|
203 | catch (IOException exception) {
|
---|
204 | exception.printStackTrace();
|
---|
205 | }
|
---|
206 | }
|
---|
207 |
|
---|
208 | private static String xmlSafe(String text) {
|
---|
209 | return text.replaceAll("\\&", "\\&");
|
---|
210 | }
|
---|
211 |
|
---|
212 | private static Query parseQuery(IndexReader reader, QueryParser query_parser, String query_string, String fuzziness)
|
---|
213 | throws java.io.IOException, org.apache.lucene.queryParser.ParseException
|
---|
214 | {
|
---|
215 | // Split query string into the search terms and the filter terms
|
---|
216 | // * The first +(...) term contains the search terms so count
|
---|
217 | // up '(' and stop when we finish matching ')'
|
---|
218 | int offset = 0;
|
---|
219 | int paren_count = 0;
|
---|
220 | boolean seen_paren = false;
|
---|
221 | while (offset < query_string.length() && (!seen_paren || paren_count > 0)) {
|
---|
222 | if (query_string.charAt(offset) == '(') {
|
---|
223 | paren_count++;
|
---|
224 | seen_paren = true;
|
---|
225 | }
|
---|
226 | if (query_string.charAt(offset) == ')') {
|
---|
227 | paren_count--;
|
---|
228 | }
|
---|
229 | offset++;
|
---|
230 | }
|
---|
231 | String query_prefix = query_string.substring(0, offset);
|
---|
232 | String query_suffix = query_string.substring(offset);
|
---|
233 |
|
---|
234 | ///ystem.err.println("Prefix: " + query_prefix);
|
---|
235 | ///ystem.err.println("Suffix: " + query_suffix);
|
---|
236 |
|
---|
237 | Query query = query_parser.parse(query_prefix);
|
---|
238 | query = query.rewrite(reader);
|
---|
239 |
|
---|
240 | // If this is a fuzzy search, then we need to add the fuzzy
|
---|
241 | // flag to each of the query terms
|
---|
242 | if (fuzziness != null && query.toString().length() > 0) {
|
---|
243 | // Revert the query to a string
|
---|
244 | System.err.println("Rewritten query: " + query.toString());
|
---|
245 | // Search through the string for TX:<term> query terms
|
---|
246 | // and append the ~ operator. Not that this search will
|
---|
247 | // not change phrase searches (TX:"<term> <term>") as
|
---|
248 | // fuzzy searching is not possible for these entries.
|
---|
249 | // Yahoo! Time for a state machine!
|
---|
250 | StringBuffer mutable_query_string = new StringBuffer(query.toString());
|
---|
251 | int o = 0; // Offset
|
---|
252 | // 0 = BASE, 1 = SEEN_T, 2 = SEEN_TX, 3 = SEEN_TX:
|
---|
253 | int s = 0; // State
|
---|
254 | while (o < mutable_query_string.length()) {
|
---|
255 | char c = mutable_query_string.charAt(o);
|
---|
256 | if (s == 0 && c == TEXTFIELD.charAt(0)) {
|
---|
257 | ///ystem.err.println("Found T!");
|
---|
258 | s = 1;
|
---|
259 | }
|
---|
260 | else if (s == 1) {
|
---|
261 | if (c == TEXTFIELD.charAt(1)) {
|
---|
262 | ///ystem.err.println("Found X!");
|
---|
263 | s = 2;
|
---|
264 | }
|
---|
265 | else {
|
---|
266 | s = 0; // Reset
|
---|
267 | }
|
---|
268 | }
|
---|
269 | else if (s == 2) {
|
---|
270 | if (c == ':') {
|
---|
271 | ///ystem.err.println("Found TX:!");
|
---|
272 | s = 3;
|
---|
273 | }
|
---|
274 | else {
|
---|
275 | s = 0; // Reset
|
---|
276 | }
|
---|
277 | }
|
---|
278 | else if (s == 3) {
|
---|
279 | // Don't process phrases
|
---|
280 | if (c == '"') {
|
---|
281 | ///ystem.err.println("Stupid phrase...");
|
---|
282 | s = 0; // Reset
|
---|
283 | }
|
---|
284 | // Found the end of the term... add the
|
---|
285 | // fuzzy search indicator
|
---|
286 | // Nor outside the scope of parentheses
|
---|
287 | else if (Character.isWhitespace(c) || c == ')') {
|
---|
288 | ///ystem.err.println("Yahoo! Found fuzzy term.");
|
---|
289 | mutable_query_string.insert(o, '~' + fuzziness);
|
---|
290 | o++;
|
---|
291 | s = 0; // Reset
|
---|
292 | }
|
---|
293 | }
|
---|
294 | o++;
|
---|
295 | }
|
---|
296 | // If we were in the state of looking for the end of a
|
---|
297 | // term - then we just found it!
|
---|
298 | if (s == 3) {
|
---|
299 | mutable_query_string.append('~' + fuzziness);
|
---|
300 | }
|
---|
301 | // Reparse the query
|
---|
302 | ///ystem.err.println("Fuzzy query: " + mutable_query_string.toString() + query_suffix);
|
---|
303 | query = query_parser.parse(mutable_query_string.toString() + query_suffix);
|
---|
304 | }
|
---|
305 | else {
|
---|
306 | query = query_parser.parse(query_prefix + query_suffix);
|
---|
307 | }
|
---|
308 |
|
---|
309 | return query;
|
---|
310 | }
|
---|
311 |
|
---|
312 |
|
---|
313 | /**
|
---|
314 | * @todo Michael to comment
|
---|
315 | */
|
---|
316 | private static Filter parseFilterString(String filter_string)
|
---|
317 | {
|
---|
318 | Filter result = null;
|
---|
319 | Pattern pattern = Pattern.compile("\\s*\\+(\\w+)\\:([\\{\\[])(\\d+)\\s+TO\\s+(\\d+)([\\}\\]])\\s*");
|
---|
320 | Matcher matcher = pattern.matcher(filter_string);
|
---|
321 | if (matcher.matches()) {
|
---|
322 | String field_name = matcher.group(1);
|
---|
323 | boolean include_lower = matcher.group(2).equals("[");
|
---|
324 | String lower_term = matcher.group(3);
|
---|
325 | String upper_term = matcher.group(4);
|
---|
326 | boolean include_upper = matcher.group(5).equals("]");
|
---|
327 | result = new RangeFilter(field_name, lower_term, upper_term, include_lower, include_upper);
|
---|
328 | }
|
---|
329 | else {
|
---|
330 | System.err.println("Error: Could not understand filter string \"" + filter_string + "\"");
|
---|
331 | }
|
---|
332 | return result;
|
---|
333 | }
|
---|
334 | /** parseFilterString() **/
|
---|
335 | }
|
---|