/*
* 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.support;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public abstract class MultiValuesSourceAggregatorFactory<VS extends ValuesSource, AF extends MultiValuesSourceAggregatorFactory<VS, AF>>
extends AggregatorFactory<AF> {
protected Map<String, ValuesSourceConfig<VS>> configs;
public MultiValuesSourceAggregatorFactory(String name, Map<String, ValuesSourceConfig<VS>> configs,
SearchContext context, AggregatorFactory<?> parent, AggregatorFactories.Builder subFactoriesBuilder,
Map<String, Object> metaData) throws IOException {
super(name, context, parent, subFactoriesBuilder, metaData);
this.configs = configs;
}
@Override
public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) throws IOException {
HashMap<String, VS> valuesSources = new HashMap<>();
for (Map.Entry<String, ValuesSourceConfig<VS>> config : configs.entrySet()) {
VS vs = config.getValue().toValuesSource(context.getQueryShardContext());
if (vs != null) {
valuesSources.put(config.getKey(), vs);
}
}
if (valuesSources.isEmpty()) {
return createUnmapped(parent, pipelineAggregators, metaData);
}
return doCreateInternal(valuesSources, parent, collectsFromSingleBucket, pipelineAggregators, metaData);
}
protected abstract Aggregator createUnmapped(Aggregator parent, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) throws IOException;
protected abstract Aggregator doCreateInternal(Map<String, VS> valuesSources, Aggregator parent, boolean collectsFromSingleBucket,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException;
}