Source Code Cross Referenced for FrenchAnalyzer.java in  » Search-Engine » Lius-0.4 » org » apache » lucene » analysis » fr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » Lius 0.4 » org.apache.lucene.analysis.fr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.lucene.analysis.fr;
002:
003:        /* ====================================================================
004:
005:         * The Apache Software License, Version 1.1
006:
007:         *
008:
009:         * Copyright (c) 2004 The Apache Software Foundation.  All rights
010:
011:         * reserved.
012:
013:         *
014:
015:         * Redistribution and use in source and binary forms, with or without
016:
017:         * modification, are permitted provided that the following conditions
018:
019:         * are met:
020:
021:         *
022:
023:         * 1. Redistributions of source code must retain the above copyright
024:
025:         *    notice, this list of conditions and the following disclaimer.
026:
027:         *
028:
029:         * 2. Redistributions in binary form must reproduce the above copyright
030:
031:         *    notice, this list of conditions and the following disclaimer in
032:
033:         *    the documentation and/or other materials provided with the
034:
035:         *    distribution.
036:
037:         *
038:
039:         * 3. The end-user documentation included with the redistribution,
040:
041:         *    if any, must include the following acknowledgment:
042:
043:         *       "This product includes software developed by the
044:
045:         *        Apache Software Foundation (http://www.apache.org/)."
046:
047:         *    Alternately, this acknowledgment may appear in the software itself,
048:
049:         *    if and wherever such third-party acknowledgments normally appear.
050:
051:         *
052:
053:         * 4. The names "Apache" and "Apache Software Foundation" and
054:
055:         *    "Apache Lucene" must not be used to endorse or promote products
056:
057:         *    derived from this software without prior written permission. For
058:
059:         *    written permission, please contact apache@apache.org.
060:
061:         *
062:
063:         * 5. Products derived from this software may not be called "Apache",
064:
065:         *    "Apache Lucene", nor may "Apache" appear in their name, without
066:
067:         *    prior written permission of the Apache Software Foundation.
068:
069:         *
070:
071:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
072:
073:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
074:
075:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
076:
077:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
078:
079:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
080:
081:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
082:
083:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
084:
085:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
086:
087:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
088:
089:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
090:
091:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
092:
093:         * SUCH DAMAGE.
094:
095:         * ====================================================================
096:
097:         *
098:
099:         * This software consists of voluntary contributions made by many
100:
101:         * individuals on behalf of the Apache Software Foundation.  For more
102:
103:         * information on the Apache Software Foundation, please see
104:
105:         * <http://www.apache.org/>.
106:
107:         */
108:
109:        import org.apache.lucene.analysis.Analyzer;
110:
111:        import org.apache.lucene.analysis.LowerCaseFilter;
112:
113:        import org.apache.lucene.analysis.StopFilter;
114:
115:        import org.apache.lucene.analysis.TokenStream;
116:
117:        //import org.apache.lucene.analysis.WordlistLoader;
118:
119:        import org.apache.lucene.analysis.standard.StandardFilter;
120:
121:        import org.apache.lucene.analysis.standard.StandardTokenizer;
122:
123:        import java.io.File;
124:
125:        import java.io.IOException;
126:
127:        import java.io.Reader;
128:
129:        import java.util.HashSet;
130:
131:        import java.util.Hashtable;
132:
133:        import java.util.Set;
134:
135:        import org.apache.lucene.analysis.de.WordlistLoader;
136:
137:        /**
138:
139:         * Analyzer for french language. Supports an external list of stopwords (words that
140:
141:         * will not be indexed at all) and an external list of exclusions (word that will
142:
143:         * not be stemmed, but indexed).
144:
145:         * A default set of stopwords is used unless an other list is specified, the
146:
147:         * exclusionlist is empty by default.
148:
149:         *
150:
151:         * @author Patrick Talbot (based on Gerhard Schwarz work for German)
152:
153:         * @version $Id: FrenchAnalyzer.java,v 1.1 2005/06/02 01:36:00 jfendler Exp $
154:
155:         */
156:
157:        public final class FrenchAnalyzer
158:
159:        extends Analyzer {
160:
161:            /**
162:
163:             * Extended list of typical french stopwords.
164:
165:             */
166:
167:            public final static String[] FRENCH_STOP_WORDS = {
168:
169:            "a", "afin", "ai", "ainsi", "après", "attendu", "au", "aujourd",
170:                    "auquel",
171:
172:                    "aussi", "autre", "autres", "aux", "auxquelles",
173:                    "auxquels", "avait", "avant",
174:
175:                    "avec", "avoir", "c", "car", "ce", "ceci", "cela", "celle",
176:                    "celles", "celui", "cependant",
177:
178:                    "certain", "certaine", "certaines", "certains", "ces",
179:                    "cet", "cette", "ceux",
180:
181:                    "chez", "ci", "combien", "comme", "comment", "concernant",
182:                    "contre", "d", "dans",
183:
184:                    "de", "debout", "dedans", "dehors", "delà", "depuis",
185:                    "derrière", "des", "désormais",
186:
187:                    "desquelles", "desquels", "dessous", "dessus", "devant",
188:                    "devers", "devra",
189:
190:                    "divers", "diverse", "diverses", "doit", "donc", "dont",
191:                    "du", "duquel", "durant", "dès",
192:
193:                    "elle", "elles", "en", "entre", "environ", "est", "et",
194:                    "etc", "etre", "eu", "eux",
195:
196:                    "excepté", "hormis", "hors", "hélas", "hui", "il", "ils",
197:                    "j", "je", "jusqu", "jusque",
198:
199:                    "l", "la", "laquelle", "le", "lequel", "les", "lesquelles",
200:                    "lesquels", "leur", "leurs",
201:
202:                    "lorsque", "lui", "là", "ma", "mais", "malgré", "me",
203:                    "merci", "mes", "mien", "mienne",
204:
205:                    "miennes", "miens", "moi", "moins", "mon", "moyennant",
206:                    "même", "mêmes", "n", "ne", "ni", "non",
207:
208:                    "nos", "notre", "nous", "néanmoins", "nôtre", "nôtres",
209:                    "on", "ont", "ou", "outre",
210:
211:                    "où", "par", "parmi", "partant", "pas", "passé", "pendant",
212:                    "plein", "plus", "plusieurs",
213:
214:                    "pour", "pourquoi", "proche", "près", "puisque", "qu",
215:                    "quand", "que", "quel", "quelle",
216:
217:                    "quelles", "quels", "qui", "quoi", "quoique", "revoici",
218:                    "revoilà", "s", "sa", "sans",
219:
220:                    "sauf", "se", "selon", "seront", "ses", "si", "sien",
221:                    "sienne", "siennes", "siens", "sinon",
222:
223:                    "soi", "soit", "son", "sont", "sous", "suivant", "sur",
224:                    "ta", "te", "tes", "tien",
225:
226:                    "tienne", "tiennes", "tiens", "toi", "ton", "tous", "tout",
227:                    "toute", "toutes", "tu", "un",
228:
229:                    "une", "va", "vers", "voici", "voilà", "vos", "votre",
230:                    "vous", "vu", "vôtre", "vôtres",
231:
232:                    "y", "à", "ça", "ès", "été", "être", "ô", "l'"
233:
234:            };
235:
236:            /**
237:
238:             * Contains the stopwords used with the StopFilter.
239:
240:             */
241:
242:            private Set stoptable = new HashSet();
243:
244:            /**
245:
246:             * Contains words that should be indexed but not stemmed.
247:
248:             */
249:
250:            private Set excltable = new HashSet();
251:
252:            /**
253:
254:             * Builds an analyzer with the default stop words ({@link #FRENCH_STOP_WORDS}).
255:
256:             */
257:
258:            public FrenchAnalyzer() {
259:
260:                stoptable = StopFilter.makeStopSet(FRENCH_STOP_WORDS);
261:
262:            }
263:
264:            /**
265:
266:             * Builds an analyzer with the given stop words.
267:
268:             */
269:
270:            public FrenchAnalyzer(String[] stopwords) {
271:
272:                stoptable = StopFilter.makeStopSet(stopwords);
273:
274:            }
275:
276:            /**
277:
278:             * Builds an analyzer with the given stop words.
279:
280:             *
281:
282:             * @deprecated
283:
284:             */
285:
286:            public FrenchAnalyzer(Hashtable stopwords) {
287:
288:                stoptable = new HashSet(stopwords.keySet());
289:
290:            }
291:
292:            /**
293:
294:             * Builds an analyzer with the given stop words.
295:
296:             * @throws IOException
297:
298:             */
299:
300:            public FrenchAnalyzer(File stopwords) throws IOException {
301:
302:                stoptable = new HashSet(WordlistLoader.getWordSet(stopwords));
303:
304:            }
305:
306:            /**
307:
308:             * Builds an exclusionlist from an array of Strings.
309:
310:             */
311:
312:            public void setStemExclusionTable(String[] exclusionlist) {
313:
314:                excltable = StopFilter.makeStopSet(exclusionlist);
315:
316:            }
317:
318:            /**
319:
320:             * Builds an exclusionlist from a Hashtable.
321:
322:             */
323:
324:            public void setStemExclusionTable(Hashtable exclusionlist) {
325:
326:                excltable = new HashSet(exclusionlist.keySet());
327:
328:            }
329:
330:            /**
331:
332:             * Builds an exclusionlist from the words contained in the given file.
333:
334:             * @throws IOException
335:
336:             */
337:
338:            public void setStemExclusionTable(File exclusionlist)
339:                    throws IOException {
340:
341:                excltable = new HashSet(WordlistLoader
342:                        .getWordSet(exclusionlist));
343:
344:            }
345:
346:            /**
347:
348:             * Creates a TokenStream which tokenizes all the text in the provided Reader.
349:
350:             *
351:
352:             * @return A TokenStream build from a StandardTokenizer filtered with
353:
354:             *         StandardFilter, StopFilter, FrenchStemFilter and LowerCaseFilter
355:
356:             */
357:
358:            public final TokenStream tokenStream(String fieldName, Reader reader) {
359:
360:                if (fieldName == null)
361:
362:                    throw new IllegalArgumentException(
363:                            "fieldName must not be null");
364:
365:                if (reader == null)
366:
367:                    throw new IllegalArgumentException("readermust not be null");
368:
369:                TokenStream result = new StandardTokenizer(reader);
370:
371:                result = new StandardFilter(result);
372:
373:                result = new StopFilter(result, stoptable);
374:
375:                result = new FrenchStemFilter(result, excltable);
376:
377:                // Convert to lowercase after stemming!
378:
379:                result = new LowerCaseFilter(result);
380:
381:                return result;
382:
383:            }
384:
385:        }
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