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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.indices.analysis;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.KeywordTokenizer;
import org.apache.lucene.analysis.core.LetterTokenizer;
import org.apache.lucene.analysis.core.LowerCaseTokenizer;
import org.apache.lucene.analysis.core.WhitespaceTokenizer;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
import org.apache.lucene.analysis.path.PathHierarchyTokenizer;
import org.apache.lucene.analysis.pattern.PatternTokenizer;
import org.apache.lucene.analysis.standard.ClassicTokenizer;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.analysis.standard.UAX29URLEmailTokenizer;
import org.apache.lucene.analysis.th.ThaiTokenizer;
import org.elasticsearch.Version;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.index.analysis.MultiTermAwareComponent;
import org.elasticsearch.index.analysis.TokenFilterFactory;
import org.elasticsearch.index.analysis.TokenizerFactory;
import org.elasticsearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
import java.util.Locale;
/**
*
*/
public enum PreBuiltTokenizers {
STANDARD(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new StandardTokenizer();
}
},
CLASSIC(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new ClassicTokenizer();
}
},
UAX_URL_EMAIL(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new UAX29URLEmailTokenizer();
}
},
PATH_HIERARCHY(CachingStrategy.ONE) {
@Override
protected Tokenizer create(Version version) {
return new PathHierarchyTokenizer();
}
},
KEYWORD(CachingStrategy.ONE) {
@Override
protected Tokenizer create(Version version) {
return new KeywordTokenizer();
}
},
LETTER(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new LetterTokenizer();
}
},
LOWERCASE(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new LowerCaseTokenizer();
}
@Override
protected TokenFilterFactory getMultiTermComponent(Version version) {
return PreBuiltTokenFilters.LOWERCASE.getTokenFilterFactory(version);
}
},
WHITESPACE(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new WhitespaceTokenizer();
}
},
NGRAM(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new NGramTokenizer();
}
},
EDGE_NGRAM(CachingStrategy.LUCENE) {
@Override
protected Tokenizer create(Version version) {
return new EdgeNGramTokenizer(EdgeNGramTokenizer.DEFAULT_MIN_GRAM_SIZE, EdgeNGramTokenizer.DEFAULT_MAX_GRAM_SIZE);
}
},
PATTERN(CachingStrategy.ONE) {
@Override
protected Tokenizer create(Version version) {
return new PatternTokenizer(Regex.compile("\\W+", null), -1);
}
},
THAI(CachingStrategy.ONE) {
@Override
protected Tokenizer create(Version version) {
return new ThaiTokenizer();
}
}
;
protected abstract Tokenizer create(Version version);
protected TokenFilterFactory getMultiTermComponent(Version version) {
return null;
}
protected final PreBuiltCacheFactory.PreBuiltCache cache;
PreBuiltTokenizers(CachingStrategy cachingStrategy) {
cache = PreBuiltCacheFactory.getCache(cachingStrategy);
}
private interface MultiTermAwareTokenizerFactory extends TokenizerFactory, MultiTermAwareComponent {}
public synchronized TokenizerFactory getTokenizerFactory(final Version version) {
TokenizerFactory tokenizerFactory = cache.get(version);
if (tokenizerFactory == null) {
final String finalName = name().toLowerCase(Locale.ROOT);
if (getMultiTermComponent(version) != null) {
tokenizerFactory = new MultiTermAwareTokenizerFactory() {
@Override
public String name() {
return finalName;
}
@Override
public Tokenizer create() {
return PreBuiltTokenizers.this.create(version);
}
@Override
public Object getMultiTermComponent() {
return PreBuiltTokenizers.this.getMultiTermComponent(version);
}
};
} else {
tokenizerFactory = new TokenizerFactory() {
@Override
public String name() {
return finalName;
}
@Override
public Tokenizer create() {
return PreBuiltTokenizers.this.create(version);
}
};
}
cache.put(version, tokenizerFactory);
}
return tokenizerFactory;
}
/**
* Get a pre built Tokenizer by its name or fallback to the default one
* @param name Tokenizer name
* @param defaultTokenizer default Tokenizer if name not found
*/
public static PreBuiltTokenizers getOrDefault(String name, PreBuiltTokenizers defaultTokenizer) {
try {
return valueOf(name.toUpperCase(Locale.ROOT));
} catch (IllegalArgumentException e) {
return defaultTokenizer;
}
}
}