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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.apache.lucene.analysis.Analyzer;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.mapper.TextFieldMapper;
import java.util.Map;
import static org.elasticsearch.index.analysis.AnalyzerComponents.createComponents;
/**
* 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 Analyzer customAnalyzer;
public CustomAnalyzerProvider(IndexSettings indexSettings,
String name, Settings settings) {
super(indexSettings, name, settings);
this.analyzerSettings = settings;
}
void build(final Map tokenizers,
final Map charFilters,
final Map tokenFilters) {
customAnalyzer = create(name(), analyzerSettings, tokenizers, charFilters, tokenFilters);
}
/**
* Factory method that either returns a plain {@link ReloadableCustomAnalyzer} if the components used for creation are supporting index
* and search time use, or a {@link ReloadableCustomAnalyzer} if the components are intended for search time use only.
*/
private static Analyzer create(String name, Settings analyzerSettings, Map tokenizers,
Map charFilters,
Map tokenFilters) {
int positionIncrementGap = TextFieldMapper.Defaults.POSITION_INCREMENT_GAP;
positionIncrementGap = analyzerSettings.getAsInt("position_increment_gap", positionIncrementGap);
int offsetGap = analyzerSettings.getAsInt("offset_gap", -1);
AnalyzerComponents components = createComponents(name, analyzerSettings, tokenizers, charFilters, tokenFilters);
if (components.analysisMode().equals(AnalysisMode.SEARCH_TIME)) {
return new ReloadableCustomAnalyzer(components, positionIncrementGap, offsetGap);
} else {
return new CustomAnalyzer(components.getTokenizerFactory(), components.getCharFilters(),
components.getTokenFilters(), positionIncrementGap, offsetGap);
}
}
@Override
public Analyzer get() {
return this.customAnalyzer;
}
}