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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.metrics;
import org.elasticsearch.common.util.Comparators;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.sort.SortOrder;
import java.io.IOException;
import java.util.Locale;
import java.util.Map;
public abstract class NumericMetricsAggregator extends MetricsAggregator {
private NumericMetricsAggregator(String name, AggregationContext context, Aggregator parent, Map metadata)
throws IOException {
super(name, context, parent, metadata);
}
public abstract static class SingleValue extends NumericMetricsAggregator {
protected SingleValue(String name, AggregationContext context, Aggregator parent, Map metadata) throws IOException {
super(name, context, parent, metadata);
}
public abstract double metric(long owningBucketOrd);
@Override
public BucketComparator bucketComparator(String key, SortOrder order) {
if (key != null && false == "value".equals(key)) {
throw new IllegalArgumentException(String.format(Locale.ROOT, """
Ordering on a single-value metrics aggregation can only be done on its value. \
Either drop the key (a la "%s") or change it to "value" (a la "%s.value")""", name(), name()));
}
return (lhs, rhs) -> Comparators.compareDiscardNaN(metric(lhs), metric(rhs), order == SortOrder.ASC);
}
}
public abstract static class MultiValue extends NumericMetricsAggregator {
protected MultiValue(String name, AggregationContext context, Aggregator parent, Map metadata) throws IOException {
super(name, context, parent, metadata);
}
public abstract boolean hasMetric(String name);
public abstract double metric(String name, long owningBucketOrd);
@Override
public BucketComparator bucketComparator(String key, SortOrder order) {
if (key == null) {
throw new IllegalArgumentException("When ordering on a multi-value metrics aggregation a metric name must be specified.");
}
if (false == hasMetric(key)) {
throw new IllegalArgumentException("Unknown metric name [" + key + "] on multi-value metrics aggregation [" + name() + "]");
}
// TODO it'd be faster replace hasMetric and metric with something that returned a function from long to double.
return (lhs, rhs) -> Comparators.compareDiscardNaN(metric(key, lhs), metric(key, rhs), order == SortOrder.ASC);
}
}
}