org.elasticsearch.search.aggregations.bucket.children.ChildrenAggregatorFactory Maven / Gradle / Ivy

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 * the Apache License, Version 2.0 (the "License"); you may
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.aggregations.bucket.children;

import org.apache.lucene.search.Query;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.NonCollectingAggregator;
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.Bytes.ParentChild;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;

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

public class ChildrenAggregatorFactory
        extends ValuesSourceAggregatorFactory {

    private final String parentType;
    private final Query parentFilter;
    private final Query childFilter;

    public ChildrenAggregatorFactory(String name, Type type, ValuesSourceConfig config, String parentType, Query childFilter,
            Query parentFilter, AggregationContext context, AggregatorFactory parent, AggregatorFactories.Builder subFactoriesBuilder,
            Map metaData) throws IOException {
        super(name, type, config, context, parent, subFactoriesBuilder, metaData);
        this.parentType = parentType;
        this.childFilter = childFilter;
        this.parentFilter = parentFilter;
    }

    @Override
    protected Aggregator createUnmapped(Aggregator parent, List pipelineAggregators, Map metaData)
            throws IOException {
        return new NonCollectingAggregator(name, context, parent, pipelineAggregators, metaData) {

            @Override
            public InternalAggregation buildEmptyAggregation() {
                return new InternalChildren(name, 0, buildEmptySubAggregations(), pipelineAggregators(), metaData());
            }

        };
    }

    @Override
    protected Aggregator doCreateInternal(ValuesSource.Bytes.WithOrdinals.ParentChild valuesSource, Aggregator parent,
            boolean collectsFromSingleBucket, List pipelineAggregators, Map metaData)
                    throws IOException {
        long maxOrd = valuesSource.globalMaxOrd(context.searchContext().searcher(), parentType);
        return new ParentToChildrenAggregator(name, factories, context, parent, parentType, childFilter, parentFilter, valuesSource, maxOrd,
                pipelineAggregators, metaData);
    }

}