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* 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
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package org.elasticsearch.index.analysis;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import static org.elasticsearch.index.analysis.NGramTokenizerFactory.parseTokenChars;
public class EdgeNGramTokenizerFactory extends AbstractTokenizerFactory {
private final int minGram;
private final int maxGram;
private final CharMatcher matcher;
public EdgeNGramTokenizerFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
super(indexSettings, name, settings);
this.minGram = settings.getAsInt("min_gram", NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE);
this.maxGram = settings.getAsInt("max_gram", NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE);
this.matcher = parseTokenChars(settings.getAsArray("token_chars"));
}
@Override
public Tokenizer create() {
if (matcher == null) {
return new EdgeNGramTokenizer(minGram, maxGram);
} else {
return new EdgeNGramTokenizer(minGram, maxGram) {
@Override
protected boolean isTokenChar(int chr) {
return matcher.isTokenChar(chr);
}
};
}
}
}