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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.apache.lucene.analysis.core.StopAnalyzer;
import org.apache.lucene.analysis.util.CharArraySet;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.Version;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettings;
import java.util.regex.Pattern;
/**
*
*/
public class PatternAnalyzerProvider extends AbstractIndexAnalyzerProvider<Analyzer> {
private final PatternAnalyzer analyzer;
@Inject
public PatternAnalyzerProvider(Index index, @IndexSettings Settings indexSettings, Environment env, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name, settings);
Version esVersion = Version.indexCreated(indexSettings);
final CharArraySet defaultStopwords;
if (esVersion.onOrAfter(Version.V_1_0_0_RC1)) {
defaultStopwords = CharArraySet.EMPTY_SET;
} else {
defaultStopwords = StopAnalyzer.ENGLISH_STOP_WORDS_SET;
}
boolean lowercase = settings.getAsBoolean("lowercase", true);
CharArraySet stopWords = Analysis.parseStopWords(env, settings, defaultStopwords);
String sPattern = settings.get("pattern", "\\W+" /*PatternAnalyzer.NON_WORD_PATTERN*/);
if (sPattern == null) {
throw new ElasticsearchIllegalArgumentException("Analyzer [" + name + "] of type pattern must have a `pattern` set");
}
Pattern pattern = Regex.compile(sPattern, settings.get("flags"));
analyzer = new PatternAnalyzer(pattern, lowercase, stopWords);
}
@Override
public PatternAnalyzer get() {
return analyzer;
}
}