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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.TokenStream;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.el.GreekLowerCaseFilter;
import org.apache.lucene.analysis.ga.IrishLowerCaseFilter;
import org.apache.lucene.analysis.tr.TurkishLowerCaseFilter;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
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;
/**
* Factory for {@link LowerCaseFilter} and some language-specific variants
* supported by the {@code language} parameter:
* <ul>
* <li>greek: {@link GreekLowerCaseFilter}
* <li>irish: {@link IrishLowerCaseFilter}
* <li>turkish: {@link TurkishLowerCaseFilter}
* </ul>
*/
public class LowerCaseTokenFilterFactory extends AbstractTokenFilterFactory {
private final String lang;
@Inject
public LowerCaseTokenFilterFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name, settings);
this.lang = settings.get("language", null);
}
@Override
public TokenStream create(TokenStream tokenStream) {
if (lang == null) {
return new LowerCaseFilter(tokenStream);
} else if (lang.equalsIgnoreCase("greek")) {
return new GreekLowerCaseFilter(tokenStream);
} else if (lang.equalsIgnoreCase("irish")) {
return new IrishLowerCaseFilter(tokenStream);
} else if (lang.equalsIgnoreCase("turkish")) {
return new TurkishLowerCaseFilter(tokenStream);
} else {
throw new ElasticsearchIllegalArgumentException("language [" + lang + "] not support for lower case");
}
}
}