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* the Apache License, Version 2.0 (the "License"); you may
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* 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
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package org.elasticsearch.search.aggregations.metrics.cardinality;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class CardinalityAggregatorFactory extends ValuesSourceAggregatorFactory<ValuesSource, CardinalityAggregatorFactory> {
private final Long precisionThreshold;
public CardinalityAggregatorFactory(String name, ValuesSourceConfig<ValuesSource> config, Long precisionThreshold,
SearchContext context, AggregatorFactory<?> parent, AggregatorFactories.Builder subFactoriesBuilder,
Map<String, Object> metaData) throws IOException {
super(name, config, context, parent, subFactoriesBuilder, metaData);
this.precisionThreshold = precisionThreshold;
}
@Override
protected Aggregator createUnmapped(Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
return new CardinalityAggregator(name, null, precision(), context, parent, pipelineAggregators, metaData);
}
@Override
protected Aggregator doCreateInternal(ValuesSource valuesSource, Aggregator parent, boolean collectsFromSingleBucket,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
return new CardinalityAggregator(name, valuesSource, precision(), context, parent, pipelineAggregators,
metaData);
}
private int precision() {
return precisionThreshold == null
? HyperLogLogPlusPlus.DEFAULT_PRECISION
: HyperLogLogPlusPlus.precisionFromThreshold(precisionThreshold);
}
}