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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.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettings;
import java.util.List;
import static com.google.common.collect.Lists.newArrayList;
/**
* 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<CustomAnalyzer> {
private final Settings analyzerSettings;
private CustomAnalyzer customAnalyzer;
@Inject
public CustomAnalyzerProvider(Index index, @IndexSettings Settings indexSettings,
@Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name, settings);
this.analyzerSettings = settings;
}
public void build(AnalysisService analysisService) {
String tokenizerName = analyzerSettings.get("tokenizer");
if (tokenizerName == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] must be configured with a tokenizer");
}
TokenizerFactory tokenizer = analysisService.tokenizer(tokenizerName);
if (tokenizer == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find tokenizer under name [" + tokenizerName + "]");
}
List<CharFilterFactory> charFilters = newArrayList();
String[] charFilterNames = analyzerSettings.getAsArray("char_filter");
for (String charFilterName : charFilterNames) {
CharFilterFactory charFilter = analysisService.charFilter(charFilterName);
if (charFilter == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find char_filter under name [" + charFilterName + "]");
}
charFilters.add(charFilter);
}
List<TokenFilterFactory> tokenFilters = newArrayList();
String[] tokenFilterNames = analyzerSettings.getAsArray("filter");
for (String tokenFilterName : tokenFilterNames) {
TokenFilterFactory tokenFilter = analysisService.tokenFilter(tokenFilterName);
if (tokenFilter == null) {
throw new IllegalArgumentException("Custom Analyzer [" + name() + "] failed to find filter under name [" + tokenFilterName + "]");
}
tokenFilters.add(tokenFilter);
}
int positionOffsetGap = analyzerSettings.getAsInt("position_offset_gap", 0);
int offsetGap = analyzerSettings.getAsInt("offset_gap", -1);
this.customAnalyzer = new CustomAnalyzer(tokenizer,
charFilters.toArray(new CharFilterFactory[charFilters.size()]),
tokenFilters.toArray(new TokenFilterFactory[tokenFilters.size()]),
positionOffsetGap,
offsetGap
);
}
@Override
public CustomAnalyzer get() {
return this.customAnalyzer;
}
}
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