org.elasticsearch.search.aggregations.pipeline.AvgBucketPipelineAggregator Maven / Gradle / Ivy

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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.search.aggregations.pipeline;

import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;

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

public class AvgBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
    private int count = 0;
    private double sum = 0;

    AvgBucketPipelineAggregator(
        String name,
        String[] bucketsPaths,
        GapPolicy gapPolicy,
        DocValueFormat format,
        Map metadata
    ) {
        super(name, bucketsPaths, gapPolicy, format, metadata);
    }

    /**
     * Read from a stream.
     */
    public AvgBucketPipelineAggregator(StreamInput in) throws IOException {
        super(in);
    }

    @Override
    public String getWriteableName() {
        return AvgBucketPipelineAggregationBuilder.NAME;
    }

    @Override
    protected void preCollection() {
        count = 0;
        sum = 0;
    }

    @Override
    protected void collectBucketValue(String bucketKey, Double bucketValue) {
        count++;
        sum += bucketValue;
    }

    @Override
    protected InternalAggregation buildAggregation(Map metadata) {
        double avgValue = count == 0 ? Double.NaN : (sum / count);
        return new InternalSimpleValue(name(), avgValue, format, metadata);
    }

}