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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.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.search.DiversifiedTopDocsCollector;
import org.apache.lucene.search.DiversifiedTopDocsCollector.ScoreDocKey;
import org.apache.lucene.search.TopDocsCollector;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.index.fielddata.AbstractNumericDocValues;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.bucket.DeferringBucketCollector;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class DiversifiedNumericSamplerAggregator extends SamplerAggregator {
private ValuesSource.Numeric valuesSource;
private int maxDocsPerValue;
DiversifiedNumericSamplerAggregator(String name, int shardSize, AggregatorFactories factories,
SearchContext context, Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData,
ValuesSource.Numeric valuesSource, int maxDocsPerValue) throws IOException {
super(name, shardSize, factories, context, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
this.maxDocsPerValue = maxDocsPerValue;
}
@Override
public DeferringBucketCollector getDeferringCollector() {
bdd = new DiverseDocsDeferringCollector();
return bdd;
}
/**
* A {@link DeferringBucketCollector} that identifies top scoring documents
* but de-duped by a key then passes only these on to nested collectors.
* This implementation is only for use with a single bucket aggregation.
*/
class DiverseDocsDeferringCollector extends BestDocsDeferringCollector {
DiverseDocsDeferringCollector() {
super(shardSize, context.bigArrays());
}
@Override
protected TopDocsCollector<ScoreDocKey> createTopDocsCollector(int size) {
return new ValuesDiversifiedTopDocsCollector(size, maxDocsPerValue);
}
// This class extends the DiversifiedTopDocsCollector and provides
// a lookup from elasticsearch's ValuesSource
class ValuesDiversifiedTopDocsCollector extends DiversifiedTopDocsCollector {
private SortedNumericDocValues values;
ValuesDiversifiedTopDocsCollector(int numHits, int maxHitsPerKey) {
super(numHits, maxHitsPerKey);
}
@Override
protected NumericDocValues getKeys(LeafReaderContext context) {
try {
values = valuesSource.longValues(context);
} catch (IOException e) {
throw new ElasticsearchException("Error reading values", e);
}
return new AbstractNumericDocValues() {
@Override
public boolean advanceExact(int target) throws IOException {
if (values.advanceExact(target)) {
if (values.docValueCount() > 1) {
throw new IllegalArgumentException(
"Sample diversifying key must be a single valued-field");
}
return true;
} else {
return false;
}
}
@Override
public int docID() {
return values.docID();
}
@Override
public long longValue() throws IOException {
return values.nextValue();
}
};
}
}
}
}
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