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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 com.ibm.icu.text.Normalizer2;
import org.apache.lucene.analysis.TokenStream;
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.IndexSettingsService;
/**
* Uses the {@link org.apache.lucene.analysis.icu.ICUNormalizer2Filter} to normalize tokens.
* <p>The <tt>name</tt> can be used to provide the type of normalization to perform.
*
*
*/
public class IcuNormalizerTokenFilterFactory extends AbstractTokenFilterFactory {
private final String name;
@Inject
public IcuNormalizerTokenFilterFactory(Index index, IndexSettingsService indexSettingsService, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettingsService.getSettings(), name, settings);
this.name = settings.get("name", "nfkc_cf");
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new org.apache.lucene.analysis.icu.ICUNormalizer2Filter(tokenStream, Normalizer2.getInstance(null, name, Normalizer2.Mode.COMPOSE));
}
}