org.elasticsearch.index.analysis.SynonymGraphTokenFilterFactory Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.synonym.SolrSynonymParser;
import org.apache.lucene.analysis.synonym.SynonymGraphFilter;
import org.apache.lucene.analysis.synonym.SynonymMap;
import org.apache.lucene.analysis.synonym.WordnetSynonymParser;
import org.elasticsearch.common.io.FastStringReader;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import java.io.IOException;
import java.io.Reader;
public class SynonymGraphTokenFilterFactory extends SynonymTokenFilterFactory {
public SynonymGraphTokenFilterFactory(IndexSettings indexSettings, Environment env, AnalysisRegistry analysisRegistry,
String name, Settings settings) throws IOException {
super(indexSettings, env, analysisRegistry, name, settings);
}
@Override
public TokenStream create(TokenStream tokenStream) {
throw new IllegalStateException("Call createPerAnalyzerSynonymGraphFactory to specialize this factory for an analysis chain first");
}
Factory createPerAnalyzerSynonymGraphFactory(Analyzer analyzerForParseSynonym, Environment env){
return new Factory("synonymgraph", analyzerForParseSynonym, getRulesFromSettings(env));
}
public class Factory implements TokenFilterFactory{
private final String name;
private final SynonymMap synonymMap;
public Factory(String name, final Analyzer analyzerForParseSynonym, Reader rulesReader) {
this.name = name;
try {
SynonymMap.Builder parser;
if ("wordnet".equalsIgnoreCase(format)) {
parser = new WordnetSynonymParser(true, expand, analyzerForParseSynonym);
((WordnetSynonymParser) parser).parse(rulesReader);
} else {
parser = new SolrSynonymParser(true, expand, analyzerForParseSynonym);
((SolrSynonymParser) parser).parse(rulesReader);
}
synonymMap = parser.build();
} catch (Exception e) {
throw new IllegalArgumentException("failed to build synonyms", e);
}
}
@Override
public String name() {
return this.name;
}
@Override
public TokenStream create(TokenStream tokenStream) {
// fst is null means no synonyms
return synonymMap.fst == null ? tokenStream : new SynonymGraphFilter(tokenStream, synonymMap, ignoreCase);
}
}
}