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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.search.DiversifiedTopDocsCollector;
import org.apache.lucene.search.DiversifiedTopDocsCollector.ScoreDocKey;
import org.apache.lucene.search.TopDocsCollector;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BytesRefHash;
import org.elasticsearch.index.fielddata.SortedBinaryDocValues;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.bucket.BestDocsDeferringCollector;
import org.elasticsearch.search.aggregations.bucket.DeferringBucketCollector;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class DiversifiedMapSamplerAggregator extends SamplerAggregator {
private ValuesSource valuesSource;
private int maxDocsPerValue;
private BytesRefHash bucketOrds;
public DiversifiedMapSamplerAggregator(String name, int shardSize, AggregatorFactories factories,
AggregationContext aggregationContext, Aggregator parent, List pipelineAggregators, Map metaData,
ValuesSource valuesSource, int maxDocsPerValue) throws IOException {
super(name, shardSize, factories, aggregationContext, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
this.maxDocsPerValue = maxDocsPerValue;
bucketOrds = new BytesRefHash(shardSize, aggregationContext.bigArrays());
}
@Override
protected void doClose() {
Releasables.close(bucketOrds);
super.doClose();
}
@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 {
public DiverseDocsDeferringCollector() {
super(shardSize, context.bigArrays());
}
@Override
protected TopDocsCollector 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 SortedBinaryDocValues values;
public ValuesDiversifiedTopDocsCollector(int numHits, int maxHitsPerKey) {
super(numHits, maxHitsPerKey);
}
@Override
protected NumericDocValues getKeys(LeafReaderContext context) {
try {
values = valuesSource.bytesValues(context);
} catch (IOException e) {
throw new ElasticsearchException("Error reading values", e);
}
return new NumericDocValues() {
@Override
public long get(int doc) {
values.setDocument(doc);
final int valuesCount = values.count();
if (valuesCount > 1) {
throw new IllegalArgumentException("Sample diversifying key must be a single valued-field");
}
if (valuesCount == 1) {
final BytesRef bytes = values.valueAt(0);
long bucketOrdinal = bucketOrds.add(bytes);
if (bucketOrdinal < 0) { // already seen
bucketOrdinal = -1 - bucketOrdinal;
}
return bucketOrdinal;
}
return 0;
}
};
}
}
}
}