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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.ScoreMode;
import java.io.IOException;
/**
* A Collector that can collect data in separate buckets.
*/
public abstract class BucketCollector implements Collector {
public static final BucketCollector NO_OP_COLLECTOR = new BucketCollector() {
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext reader) {
return LeafBucketCollector.NO_OP_COLLECTOR;
}
@Override
public void preCollection() throws IOException {
// no-op
}
@Override
public ScoreMode scoreMode() {
return ScoreMode.COMPLETE_NO_SCORES;
}
};
@Override
public abstract LeafBucketCollector getLeafCollector(LeafReaderContext ctx) throws IOException;
/**
* Pre collection callback.
*/
public abstract void preCollection() throws IOException;
}