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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.CharFilter;
import org.apache.lucene.analysis.TokenFilter;
import org.elasticsearch.Version;
import org.elasticsearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
import java.io.Reader;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* Provides pre-configured, shared {@link CharFilter}s.
*/
public class PreConfiguredCharFilter extends PreConfiguredAnalysisComponent {
/**
* Create a pre-configured char filter that may not vary at all.
*/
public static PreConfiguredCharFilter singleton(String name, boolean useFilterForMultitermQueries, Function create) {
return new PreConfiguredCharFilter(name, CachingStrategy.ONE, useFilterForMultitermQueries,
(reader, version) -> create.apply(reader));
}
/**
* Create a pre-configured char filter that may not vary at all, provide access to the elasticsearch version
*/
public static PreConfiguredCharFilter singletonWithVersion(String name, boolean useFilterForMultitermQueries,
BiFunction create) {
return new PreConfiguredCharFilter(name, CachingStrategy.ONE, useFilterForMultitermQueries,
(reader, version) -> create.apply(reader, version));
}
/**
* Create a pre-configured token filter that may vary based on the Lucene version.
*/
public static PreConfiguredCharFilter luceneVersion(String name, boolean useFilterForMultitermQueries,
BiFunction create) {
return new PreConfiguredCharFilter(name, CachingStrategy.LUCENE, useFilterForMultitermQueries,
(reader, version) -> create.apply(reader, version.luceneVersion));
}
/**
* Create a pre-configured token filter that may vary based on the Elasticsearch version.
*/
public static PreConfiguredCharFilter elasticsearchVersion(String name, boolean useFilterForMultitermQueries,
BiFunction create) {
return new PreConfiguredCharFilter(name, CachingStrategy.ELASTICSEARCH, useFilterForMultitermQueries, create);
}
private final boolean useFilterForMultitermQueries;
private final BiFunction create;
protected PreConfiguredCharFilter(String name, CachingStrategy cache, boolean useFilterForMultitermQueries,
BiFunction create) {
super(name, cache);
this.useFilterForMultitermQueries = useFilterForMultitermQueries;
this.create = create;
}
/**
* Can this {@link TokenFilter} be used in multi-term queries?
*/
public boolean shouldUseFilterForMultitermQueries() {
return useFilterForMultitermQueries;
}
@Override
protected CharFilterFactory create(Version version) {
if (useFilterForMultitermQueries) {
return new NormalizingCharFilterFactory() {
@Override
public String name() {
return getName();
}
@Override
public Reader create(Reader reader) {
return create.apply(reader, version);
}
};
}
return new CharFilterFactory() {
@Override
public Reader create(Reader reader) {
return create.apply(reader, version);
}
@Override
public String name() {
return getName();
}
};
}
}