1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.analysis;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ar.ArabicStemFilter;
import org.apache.lucene.analysis.bg.BulgarianStemFilter;
import org.apache.lucene.analysis.br.BrazilianStemFilter;
import org.apache.lucene.analysis.ckb.SoraniStemFilter;
import org.apache.lucene.analysis.cz.CzechStemFilter;
import org.apache.lucene.analysis.de.GermanLightStemFilter;
import org.apache.lucene.analysis.de.GermanMinimalStemFilter;
import org.apache.lucene.analysis.el.GreekStemFilter;
import org.apache.lucene.analysis.en.EnglishMinimalStemFilter;
import org.apache.lucene.analysis.en.EnglishPossessiveFilter;
import org.apache.lucene.analysis.en.KStemFilter;
import org.apache.lucene.analysis.en.PorterStemFilter;
import org.apache.lucene.analysis.es.SpanishLightStemFilter;
import org.apache.lucene.analysis.fi.FinnishLightStemFilter;
import org.apache.lucene.analysis.fr.FrenchLightStemFilter;
import org.apache.lucene.analysis.fr.FrenchMinimalStemFilter;
import org.apache.lucene.analysis.gl.GalicianMinimalStemFilter;
import org.apache.lucene.analysis.gl.GalicianStemFilter;
import org.apache.lucene.analysis.hi.HindiStemFilter;
import org.apache.lucene.analysis.hu.HungarianLightStemFilter;
import org.apache.lucene.analysis.id.IndonesianStemFilter;
import org.apache.lucene.analysis.it.ItalianLightStemFilter;
import org.apache.lucene.analysis.lv.LatvianStemFilter;
import org.apache.lucene.analysis.no.NorwegianLightStemFilter;
import org.apache.lucene.analysis.no.NorwegianLightStemmer;
import org.apache.lucene.analysis.no.NorwegianMinimalStemFilter;
import org.apache.lucene.analysis.pt.PortugueseLightStemFilter;
import org.apache.lucene.analysis.pt.PortugueseMinimalStemFilter;
import org.apache.lucene.analysis.pt.PortugueseStemFilter;
import org.apache.lucene.analysis.ru.RussianLightStemFilter;
import org.apache.lucene.analysis.snowball.SnowballFilter;
import org.apache.lucene.analysis.sv.SwedishLightStemFilter;
import org.elasticsearch.Version;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.tartarus.snowball.ext.*;
/**
*/
public class StemmerTokenFilterFactory extends AbstractTokenFilterFactory {
private String language;
public StemmerTokenFilterFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
super(indexSettings, name, settings);
this.language = Strings.capitalize(settings.get("language", settings.get("name", "porter")));
}
@Override
public TokenStream create(TokenStream tokenStream) {
final Version indexVersion = indexSettings.getIndexVersionCreated();
if ("arabic".equalsIgnoreCase(language)) {
return new ArabicStemFilter(tokenStream);
} else if ("armenian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new ArmenianStemmer());
} else if ("basque".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new BasqueStemmer());
} else if ("brazilian".equalsIgnoreCase(language)) {
return new BrazilianStemFilter(tokenStream);
} else if ("bulgarian".equalsIgnoreCase(language)) {
return new BulgarianStemFilter(tokenStream);
} else if ("catalan".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new CatalanStemmer());
} else if ("czech".equalsIgnoreCase(language)) {
return new CzechStemFilter(tokenStream);
} else if ("danish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new DanishStemmer());
// Dutch stemmers
} else if ("dutch".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new DutchStemmer());
} else if ("dutch_kp".equalsIgnoreCase(language) || "dutchKp".equalsIgnoreCase(language) || "kp".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new KpStemmer());
// English stemmers
} else if ("english".equalsIgnoreCase(language)) {
if (indexVersion.onOrAfter(Version.V_1_3_0)) {
return new PorterStemFilter(tokenStream);
} else {
return new SnowballFilter(tokenStream, new EnglishStemmer());
}
} else if ("light_english".equalsIgnoreCase(language) || "lightEnglish".equalsIgnoreCase(language)
|| "kstem".equalsIgnoreCase(language)) {
return new KStemFilter(tokenStream);
} else if ("lovins".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new LovinsStemmer());
} else if ("porter".equalsIgnoreCase(language)) {
return new PorterStemFilter(tokenStream);
} else if ("porter2".equalsIgnoreCase(language)) {
if (indexVersion.onOrAfter(Version.V_1_3_0)) {
return new SnowballFilter(tokenStream, new EnglishStemmer());
} else {
return new SnowballFilter(tokenStream, new PorterStemmer());
}
} else if ("minimal_english".equalsIgnoreCase(language) || "minimalEnglish".equalsIgnoreCase(language)) {
return new EnglishMinimalStemFilter(tokenStream);
} else if ("possessive_english".equalsIgnoreCase(language) || "possessiveEnglish".equalsIgnoreCase(language)) {
return new EnglishPossessiveFilter(tokenStream);
// Finnish stemmers
} else if ("finnish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new FinnishStemmer());
} else if ("light_finish".equalsIgnoreCase(language) || "lightFinish".equalsIgnoreCase(language)) {
// leaving this for backward compatibility
return new FinnishLightStemFilter(tokenStream);
} else if ("light_finnish".equalsIgnoreCase(language) || "lightFinnish".equalsIgnoreCase(language)) {
return new FinnishLightStemFilter(tokenStream);
// French stemmers
} else if ("french".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new FrenchStemmer());
} else if ("light_french".equalsIgnoreCase(language) || "lightFrench".equalsIgnoreCase(language)) {
return new FrenchLightStemFilter(tokenStream);
} else if ("minimal_french".equalsIgnoreCase(language) || "minimalFrench".equalsIgnoreCase(language)) {
return new FrenchMinimalStemFilter(tokenStream);
// Galician stemmers
} else if ("galician".equalsIgnoreCase(language)) {
return new GalicianStemFilter(tokenStream);
} else if ("minimal_galician".equalsIgnoreCase(language)) {
return new GalicianMinimalStemFilter(tokenStream);
// German stemmers
} else if ("german".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new GermanStemmer());
} else if ("german2".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new German2Stemmer());
} else if ("light_german".equalsIgnoreCase(language) || "lightGerman".equalsIgnoreCase(language)) {
return new GermanLightStemFilter(tokenStream);
} else if ("minimal_german".equalsIgnoreCase(language) || "minimalGerman".equalsIgnoreCase(language)) {
return new GermanMinimalStemFilter(tokenStream);
} else if ("greek".equalsIgnoreCase(language)) {
return new GreekStemFilter(tokenStream);
} else if ("hindi".equalsIgnoreCase(language)) {
return new HindiStemFilter(tokenStream);
// Hungarian stemmers
} else if ("hungarian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new HungarianStemmer());
} else if ("light_hungarian".equalsIgnoreCase(language) || "lightHungarian".equalsIgnoreCase(language)) {
return new HungarianLightStemFilter(tokenStream);
} else if ("indonesian".equalsIgnoreCase(language)) {
return new IndonesianStemFilter(tokenStream);
// Irish stemmer
} else if ("irish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new IrishStemmer());
// Italian stemmers
} else if ("italian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new ItalianStemmer());
} else if ("light_italian".equalsIgnoreCase(language) || "lightItalian".equalsIgnoreCase(language)) {
return new ItalianLightStemFilter(tokenStream);
} else if ("latvian".equalsIgnoreCase(language)) {
return new LatvianStemFilter(tokenStream);
} else if ("lithuanian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new LithuanianStemmer());
// Norwegian (Bokmål) stemmers
} else if ("norwegian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new NorwegianStemmer());
} else if ("light_norwegian".equalsIgnoreCase(language) || "lightNorwegian".equalsIgnoreCase(language)) {
return new NorwegianLightStemFilter(tokenStream);
} else if ("minimal_norwegian".equalsIgnoreCase(language) || "minimalNorwegian".equals(language)) {
return new NorwegianMinimalStemFilter(tokenStream);
// Norwegian (Nynorsk) stemmers
} else if ("light_nynorsk".equalsIgnoreCase(language) || "lightNynorsk".equalsIgnoreCase(language)) {
return new NorwegianLightStemFilter(tokenStream, NorwegianLightStemmer.NYNORSK);
} else if ("minimal_nynorsk".equalsIgnoreCase(language) || "minimalNynorsk".equalsIgnoreCase(language)) {
return new NorwegianMinimalStemFilter(tokenStream, NorwegianLightStemmer.NYNORSK);
// Portuguese stemmers
} else if ("portuguese".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new PortugueseStemmer());
} else if ("light_portuguese".equalsIgnoreCase(language) || "lightPortuguese".equalsIgnoreCase(language)) {
return new PortugueseLightStemFilter(tokenStream);
} else if ("minimal_portuguese".equalsIgnoreCase(language) || "minimalPortuguese".equalsIgnoreCase(language)) {
return new PortugueseMinimalStemFilter(tokenStream);
} else if ("portuguese_rslp".equalsIgnoreCase(language)) {
return new PortugueseStemFilter(tokenStream);
} else if ("romanian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new RomanianStemmer());
// Russian stemmers
} else if ("russian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new RussianStemmer());
} else if ("light_russian".equalsIgnoreCase(language) || "lightRussian".equalsIgnoreCase(language)) {
return new RussianLightStemFilter(tokenStream);
// Spanish stemmers
} else if ("spanish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new SpanishStemmer());
} else if ("light_spanish".equalsIgnoreCase(language) || "lightSpanish".equalsIgnoreCase(language)) {
return new SpanishLightStemFilter(tokenStream);
// Sorani Kurdish stemmer
} else if ("sorani".equalsIgnoreCase(language)) {
return new SoraniStemFilter(tokenStream);
// Swedish stemmers
} else if ("swedish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new SwedishStemmer());
} else if ("light_swedish".equalsIgnoreCase(language) || "lightSwedish".equalsIgnoreCase(language)) {
return new SwedishLightStemFilter(tokenStream);
} else if ("turkish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new TurkishStemmer());
}
return new SnowballFilter(tokenStream, language);
}
}
|
