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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.sampler;
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.bucket.sampler.SamplerAggregator.ExecutionMode;
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.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSource.Numeric;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class DiversifiedAggregatorFactory extends ValuesSourceAggregatorFactory {
private final int shardSize;
private final int maxDocsPerValue;
private final String executionHint;
public DiversifiedAggregatorFactory(String name, Type type, ValuesSourceConfig config, int shardSize, int maxDocsPerValue,
String executionHint, AggregationContext context, AggregatorFactory parent, AggregatorFactories.Builder subFactoriesBuilder,
Map metaData) throws IOException {
super(name, type, config, context, parent, subFactoriesBuilder, metaData);
this.shardSize = shardSize;
this.maxDocsPerValue = maxDocsPerValue;
this.executionHint = executionHint;
}
@Override
protected Aggregator doCreateInternal(ValuesSource valuesSource, Aggregator parent, boolean collectsFromSingleBucket,
List pipelineAggregators, Map metaData) throws IOException {
if (valuesSource instanceof ValuesSource.Numeric) {
return new DiversifiedNumericSamplerAggregator(name, shardSize, factories, context, parent, pipelineAggregators, metaData,
(Numeric) valuesSource, maxDocsPerValue);
}
if (valuesSource instanceof ValuesSource.Bytes) {
ExecutionMode execution = null;
if (executionHint != null) {
execution = ExecutionMode.fromString(executionHint, context.searchContext().parseFieldMatcher());
}
// In some cases using ordinals is just not supported: override
// it
if (execution == null) {
execution = ExecutionMode.GLOBAL_ORDINALS;
}
if ((execution.needsGlobalOrdinals()) && (!(valuesSource instanceof ValuesSource.Bytes.WithOrdinals))) {
execution = ExecutionMode.MAP;
}
return execution.create(name, factories, shardSize, maxDocsPerValue, valuesSource, context, parent, pipelineAggregators,
metaData);
}
throw new AggregationExecutionException("Sampler aggregation cannot be applied to field [" + config.fieldContext().field()
+ "]. It can only be applied to numeric or string fields.");
}
@Override
protected Aggregator createUnmapped(Aggregator parent, List pipelineAggregators, Map metaData)
throws IOException {
final UnmappedSampler aggregation = new UnmappedSampler(name, pipelineAggregators, metaData);
return new NonCollectingAggregator(name, context, parent, factories, pipelineAggregators, metaData) {
@Override
public InternalAggregation buildEmptyAggregation() {
return aggregation;
}
};
}
}