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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.logging.log4j.LogManager;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.elasticsearch.Version;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.indices.analysis.PreBuiltCacheFactory;
import org.elasticsearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* Provides pre-configured, shared {@link TokenFilter}s.
*/
public final class PreConfiguredTokenFilter extends PreConfiguredAnalysisComponent {
private static final DeprecationLogger DEPRECATION_LOGGER
= new DeprecationLogger(LogManager.getLogger(PreConfiguredTokenFilter.class));
/**
* Create a pre-configured token filter that may not vary at all.
*/
public static PreConfiguredTokenFilter singleton(String name, boolean useFilterForMultitermQueries,
Function create) {
return new PreConfiguredTokenFilter(name, useFilterForMultitermQueries, true, CachingStrategy.ONE,
(tokenStream, version) -> create.apply(tokenStream));
}
/**
* Create a pre-configured token filter that may not vary at all.
*/
public static PreConfiguredTokenFilter singleton(String name, boolean useFilterForMultitermQueries,
boolean allowForSynonymParsing,
Function create) {
return new PreConfiguredTokenFilter(name, useFilterForMultitermQueries, allowForSynonymParsing, CachingStrategy.ONE,
(tokenStream, version) -> create.apply(tokenStream));
}
/**
* Create a pre-configured token filter that may vary based on the Lucene version.
*/
public static PreConfiguredTokenFilter luceneVersion(String name, boolean useFilterForMultitermQueries,
BiFunction create) {
return new PreConfiguredTokenFilter(name, useFilterForMultitermQueries, true, CachingStrategy.LUCENE,
(tokenStream, version) -> create.apply(tokenStream, version.luceneVersion));
}
/**
* Create a pre-configured token filter that may vary based on the Elasticsearch version.
*/
public static PreConfiguredTokenFilter elasticsearchVersion(String name, boolean useFilterForMultitermQueries,
BiFunction create) {
return new PreConfiguredTokenFilter(name, useFilterForMultitermQueries, true, CachingStrategy.ELASTICSEARCH, create);
}
/**
* Create a pre-configured token filter that may vary based on the Elasticsearch version.
*/
public static PreConfiguredTokenFilter elasticsearchVersion(String name, boolean useFilterForMultitermQueries,
boolean useFilterForParsingSynonyms,
BiFunction create) {
return new PreConfiguredTokenFilter(name, useFilterForMultitermQueries, useFilterForParsingSynonyms,
CachingStrategy.ELASTICSEARCH, create);
}
private final boolean useFilterForMultitermQueries;
private final boolean allowForSynonymParsing;
private final BiFunction create;
private PreConfiguredTokenFilter(String name, boolean useFilterForMultitermQueries, boolean allowForSynonymParsing,
PreBuiltCacheFactory.CachingStrategy cache, BiFunction create) {
super(name, cache);
this.useFilterForMultitermQueries = useFilterForMultitermQueries;
this.allowForSynonymParsing = allowForSynonymParsing;
this.create = create;
}
/**
* Can this {@link TokenFilter} be used in multi-term queries?
*/
public boolean shouldUseFilterForMultitermQueries() {
return useFilterForMultitermQueries;
}
@Override
protected TokenFilterFactory create(Version version) {
if (useFilterForMultitermQueries) {
return new NormalizingTokenFilterFactory() {
@Override
public TokenStream normalize(TokenStream tokenStream) {
return create.apply(tokenStream, version);
}
@Override
public String name() {
return getName();
}
@Override
public TokenStream create(TokenStream tokenStream) {
return create.apply(tokenStream, version);
}
@Override
public TokenFilterFactory getSynonymFilter() {
if (allowForSynonymParsing) {
return this;
}
if (version.onOrAfter(Version.V_7_0_0)) {
throw new IllegalArgumentException("Token filter [" + name() + "] cannot be used to parse synonyms");
}
else {
DEPRECATION_LOGGER.deprecatedAndMaybeLog(name(), "Token filter [" + name()
+ "] will not be usable to parse synonyms after v7.0");
return this;
}
}
};
}
return new TokenFilterFactory() {
@Override
public String name() {
return getName();
}
@Override
public TokenStream create(TokenStream tokenStream) {
return create.apply(tokenStream, version);
}
@Override
public TokenFilterFactory getSynonymFilter() {
if (allowForSynonymParsing) {
return this;
}
if (version.onOrAfter(Version.V_7_0_0)) {
throw new IllegalArgumentException("Token filter [" + name() + "] cannot be used to parse synonyms");
}
else {
DEPRECATION_LOGGER.deprecatedAndMaybeLog(name(), "Token filter [" + name()
+ "] will not be usable to parse synonyms after v7.0");
return this;
}
}
};
}
}