/*
* 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.icu.ICUNormalizer2CharFilter;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import java.io.Reader;
/**
* Uses the {@link org.apache.lucene.analysis.icu.ICUNormalizer2CharFilter} to normalize character.
* <p>The <tt>name</tt> can be used to provide the type of normalization to perform.</p>
* <p>The <tt>mode</tt> can be used to provide 'compose' or 'decompose'. Default is compose.</p>
*/
public class IcuNormalizerCharFilterFactory extends AbstractCharFilterFactory implements MultiTermAwareComponent {
private final String name;
private final Normalizer2 normalizer;
public IcuNormalizerCharFilterFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
super(indexSettings, name);
this.name = settings.get("name", "nfkc_cf");
String mode = settings.get("mode");
if (!"compose".equals(mode) && !"decompose".equals(mode)) {
mode = "compose";
}
this.normalizer = Normalizer2.getInstance(
null, this.name, "compose".equals(mode) ? Normalizer2.Mode.COMPOSE : Normalizer2.Mode.DECOMPOSE);
}
@Override
public Reader create(Reader reader) {
return new ICUNormalizer2CharFilter(reader, normalizer);
}
@Override
public Object getMultiTermComponent() {
return this;
}
}