org.elasticsearch.search.aggregations.bucket.nested.ReverseNestedAggregatorFactory 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.bucket.nested;

import org.elasticsearch.index.mapper.NestedObjectMapper;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.CardinalityUpperBound;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.NonCollectingAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;

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

public class ReverseNestedAggregatorFactory extends AggregatorFactory {

    private final boolean unmapped;
    private final NestedObjectMapper parentObjectMapper;

    public ReverseNestedAggregatorFactory(
        String name,
        boolean unmapped,
        NestedObjectMapper parentObjectMapper,
        AggregationContext context,
        AggregatorFactory parent,
        AggregatorFactories.Builder subFactories,
        Map metadata
    ) throws IOException {
        super(name, context, parent, subFactories, metadata);
        this.unmapped = unmapped;
        this.parentObjectMapper = parentObjectMapper;
    }

    @Override
    public Aggregator createInternal(Aggregator parent, CardinalityUpperBound cardinality, Map metadata)
        throws IOException {
        if (unmapped) {
            return new Unmapped(name, context, parent, factories, metadata);
        } else {
            return new ReverseNestedAggregator(name, factories, parentObjectMapper, context, parent, cardinality, metadata);
        }
    }

    private static final class Unmapped extends NonCollectingAggregator {

        Unmapped(String name, AggregationContext context, Aggregator parent, AggregatorFactories factories, Map metadata)
            throws IOException {
            super(name, context, parent, factories, metadata);
        }

        @Override
        public InternalAggregation buildEmptyAggregation() {
            return new InternalReverseNested(name, 0, buildEmptySubAggregations(), metadata());
        }
    }
}