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/*
* 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.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.mapper.TextFieldMapper;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* A custom analyzer that is built out of a single {@link org.apache.lucene.analysis.Tokenizer} and a list
* of {@link org.apache.lucene.analysis.TokenFilter}s.
*/
public class CustomAnalyzerProvider extends AbstractIndexAnalyzerProvider {
private final Settings analyzerSettings;
private final Environment environment;
private CustomAnalyzer customAnalyzer;
public CustomAnalyzerProvider(IndexSettings indexSettings,
String name, Settings settings, Environment environment) {
super(indexSettings, name, settings);
this.analyzerSettings = settings;
this.environment = environment;
}
public void build(final Map tokenizers, final Map charFilters,
final Map tokenFilters) {
String tokenizerName = analyzerSettings.get("tokenizer");
if (tokenizerName == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] must be configured with a tokenizer");
}
TokenizerFactory tokenizer = tokenizers.get(tokenizerName);
if (tokenizer == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find tokenizer under name [" + tokenizerName + "]");
}
List charFilterNames = analyzerSettings.getAsList("char_filter");
List charFiltersList = new ArrayList<>(charFilterNames.size());
for (String charFilterName : charFilterNames) {
CharFilterFactory charFilter = charFilters.get(charFilterName);
if (charFilter == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find char_filter under name [" + charFilterName + "]");
}
charFiltersList.add(charFilter);
}
int positionIncrementGap = TextFieldMapper.Defaults.POSITION_INCREMENT_GAP;
positionIncrementGap = analyzerSettings.getAsInt("position_increment_gap", positionIncrementGap);
int offsetGap = analyzerSettings.getAsInt("offset_gap", -1);
List tokenFilterNames = analyzerSettings.getAsList("filter");
List tokenFilterList = new ArrayList<>(tokenFilterNames.size());
for (String tokenFilterName : tokenFilterNames) {
TokenFilterFactory tokenFilter = tokenFilters.get(tokenFilterName);
if (tokenFilter == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find filter under name [" + tokenFilterName + "]");
}
// no need offsetGap for tokenize synonyms
tokenFilter = checkAndApplySynonymFilter(tokenFilter, tokenizerName, tokenizer, tokenFilterList, charFiltersList,
this.environment);
tokenFilterList.add(tokenFilter);
}
this.customAnalyzer = new CustomAnalyzer(tokenizerName, tokenizer,
charFiltersList.toArray(new CharFilterFactory[charFiltersList.size()]),
tokenFilterList.toArray(new TokenFilterFactory[tokenFilterList.size()]),
positionIncrementGap,
offsetGap
);
}
public static TokenFilterFactory checkAndApplySynonymFilter(TokenFilterFactory tokenFilter, String tokenizerName, TokenizerFactory tokenizer,
List tokenFilterList,
List charFiltersList, Environment env) {
if (tokenFilter instanceof SynonymGraphTokenFilterFactory) {
List tokenFiltersListForSynonym = new ArrayList<>(tokenFilterList);
try (CustomAnalyzer analyzer = new CustomAnalyzer(tokenizerName, tokenizer,
charFiltersList.toArray(new CharFilterFactory[charFiltersList.size()]),
tokenFiltersListForSynonym.toArray(new TokenFilterFactory[tokenFiltersListForSynonym.size()]),
TextFieldMapper.Defaults.POSITION_INCREMENT_GAP,
-1)){
tokenFilter = ((SynonymGraphTokenFilterFactory) tokenFilter).createPerAnalyzerSynonymGraphFactory(analyzer, env);
}
} else if (tokenFilter instanceof SynonymTokenFilterFactory) {
List tokenFiltersListForSynonym = new ArrayList<>(tokenFilterList);
try (CustomAnalyzer analyzer = new CustomAnalyzer(tokenizerName, tokenizer,
charFiltersList.toArray(new CharFilterFactory[charFiltersList.size()]),
tokenFiltersListForSynonym.toArray(new TokenFilterFactory[tokenFiltersListForSynonym.size()]),
TextFieldMapper.Defaults.POSITION_INCREMENT_GAP,
-1)) {
tokenFilter = ((SynonymTokenFilterFactory) tokenFilter).createPerAnalyzerSynonymFactory(analyzer, env);
}
}
return tokenFilter;
}
@Override
public CustomAnalyzer get() {
return this.customAnalyzer;
}
}