org.elasticsearch.search.aggregations.pipeline.MinBucketPipelineAggregator Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* 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.ArrayList;
import java.util.List;
import java.util.Map;
public class MinBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
private List minBucketKeys;
private double minValue;
MinBucketPipelineAggregator(String name, String[] bucketsPaths, GapPolicy gapPolicy, DocValueFormat formatter,
Map metadata) {
super(name, bucketsPaths, gapPolicy, formatter, metadata);
}
/**
* Read from a stream.
*/
public MinBucketPipelineAggregator(StreamInput in) throws IOException {
super(in);
}
@Override
public String getWriteableName() {
return MinBucketPipelineAggregationBuilder.NAME;
}
@Override
protected void preCollection() {
minBucketKeys = new ArrayList<>();
minValue = Double.POSITIVE_INFINITY;
}
@Override
protected void collectBucketValue(String bucketKey, Double bucketValue) {
if (bucketValue < minValue) {
minBucketKeys.clear();
minBucketKeys.add(bucketKey);
minValue = bucketValue;
} else if (bucketValue.equals(minValue)) {
minBucketKeys.add(bucketKey);
}
}
@Override
protected InternalAggregation buildAggregation(Map metadata) {
String[] keys = minBucketKeys.toArray(new String[0]);
return new InternalBucketMetricValue(name(), keys, minValue, format, metadata());
}
}