Closes #20345 Adds minhash filter for use in Elasticsearch #20346
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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. | ||
| */ | ||
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| package org.elasticsearch.index.analysis; | ||
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| import org.apache.lucene.analysis.TokenStream; | ||
| import org.apache.lucene.analysis.minhash.MinHashFilter; | ||
| import org.apache.lucene.analysis.minhash.MinHashFilterFactory; | ||
| import org.elasticsearch.common.settings.Settings; | ||
| import org.elasticsearch.env.Environment; | ||
| import org.elasticsearch.index.IndexSettings; | ||
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| public class MinHashTokenFilterFactory extends AbstractTokenFilterFactory { | ||
| private MinHashFilterFactory luceneFactory; | ||
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| /** | ||
| * Create a {@link org.apache.lucene.analysis.minhash.MinHashFilterFactory}. | ||
| */ | ||
| public MinHashTokenFilterFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) { | ||
| super(indexSettings, name, settings); | ||
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| // annoying settings indirection because MinHashFilter | ||
| // has package-private constructor and defaults :( | ||
| // see https://issues.apache.org/jira/browse/LUCENE-7436 | ||
| Map<String, String> settingsMap = new HashMap<String, String>(); | ||
| settingsMap.put("hashCount" ,settings.get("num_hash_tables")); | ||
|
There was a problem hiding this comment. I wonder if we should at least use the same terms just |
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| settingsMap.put("bucketCount" ,settings.get("num_buckets")); | ||
| settingsMap.put("hashSetSize" ,settings.get("bucket_depth")); | ||
| settingsMap.put("withRotation", settings.get("rotate")); | ||
| luceneFactory = new MinHashFilterFactory(settingsMap); | ||
| } | ||
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| /* | ||
| * (non-Javadoc) | ||
| * | ||
| * @see org.apache.lucene.analysis.util.TokenFilterFactory#create(org.apache.lucene.analysis.TokenStream) | ||
| */ | ||
| @Override | ||
| public TokenStream create(TokenStream input) { | ||
| return luceneFactory.create(input); | ||
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| } | ||
| } | ||
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can this be final?