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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.aggregations.bucket.nested;
import org.elasticsearch.index.mapper.ObjectMapper;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
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.NonCollectingAggregator;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class NestedAggregatorFactory extends AggregatorFactory {
private final ObjectMapper parentObjectMapper;
private final ObjectMapper childObjectMapper;
public NestedAggregatorFactory(String name, Type type, ObjectMapper parentObjectMapper, ObjectMapper childObjectMapper,
AggregationContext context, AggregatorFactory parent, AggregatorFactories.Builder subFactories,
Map metaData) throws IOException {
super(name, type, context, parent, subFactories, metaData);
this.parentObjectMapper = parentObjectMapper;
this.childObjectMapper = childObjectMapper;
}
@Override
public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket, List pipelineAggregators,
Map metaData) throws IOException {
if (collectsFromSingleBucket == false) {
return asMultiBucketAggregator(this, context, parent);
}
if (childObjectMapper == null) {
return new Unmapped(name, context, parent, pipelineAggregators, metaData);
}
return new NestedAggregator(name, factories, parentObjectMapper, childObjectMapper, context, parent, pipelineAggregators, metaData);
}
private static final class Unmapped extends NonCollectingAggregator {
public Unmapped(String name, AggregationContext context, Aggregator parent, List pipelineAggregators,
Map metaData) throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalNested(name, 0, buildEmptySubAggregations(), pipelineAggregators(), metaData());
}
}
}