TDigestPercentilesAggregator.java example

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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.aggregations.metrics.percentiles.tdigest;

import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSource.Numeric;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;

import java.io.IOException;
import java.util.List;
import java.util.Map;

/**
 *
 */
public class TDigestPercentilesAggregator extends AbstractTDigestPercentilesAggregator {

    public TDigestPercentilesAggregator(String name, Numeric valuesSource, AggregationContext context,
            Aggregator parent, double[] percents,
            double compression, boolean keyed, ValueFormatter formatter, List<PipelineAggregator> pipelineAggregators,
            Map<String, Object> metaData) throws IOException {
        super(name, valuesSource, context, parent, percents, compression, keyed, formatter, pipelineAggregators, metaData);
    }

    @Override
    public InternalAggregation buildAggregation(long owningBucketOrdinal) {
        TDigestState state = getState(owningBucketOrdinal);
        if (state == null) {
            return buildEmptyAggregation();
        } else {
            return new InternalTDigestPercentiles(name, keys, state, keyed, formatter, pipelineAggregators(), metaData());
        }
    }

    @Override
    public double metric(String name, long bucketOrd) {
        TDigestState state = getState(bucketOrd);
        if (state == null) {
            return Double.NaN;
        } else {
            return state.quantile(Double.parseDouble(name) / 100);
        }
    }

    @Override
    public InternalAggregation buildEmptyAggregation() {
        return new InternalTDigestPercentiles(name, keys, new TDigestState(compression), keyed, formatter, pipelineAggregators(), metaData());
    }

    public static class Factory extends ValuesSourceAggregatorFactory.LeafOnly<ValuesSource.Numeric> {

        private final double[] percents;
        private final double compression;
        private final boolean keyed;

        public Factory(String name, ValuesSourceConfig<ValuesSource.Numeric> valuesSourceConfig,
                double[] percents, double compression, boolean keyed) {
            super(name, InternalTDigestPercentiles.TYPE.name(), valuesSourceConfig);
            this.percents = percents;
            this.compression = compression;
            this.keyed = keyed;
        }

        @Override
        protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent,
                List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
            return new TDigestPercentilesAggregator(name, null, aggregationContext, parent, percents, compression, keyed, config.formatter(),
                    pipelineAggregators, metaData);
        }

        @Override
        protected Aggregator doCreateInternal(ValuesSource.Numeric valuesSource, AggregationContext aggregationContext, Aggregator parent,
                boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
                throws IOException {
            return new TDigestPercentilesAggregator(name, valuesSource, aggregationContext, parent, percents, compression, keyed,
                    config.formatter(), pipelineAggregators, metaData);
        }
    }
}