org.elasticsearch.search.aggregations.bucket.global.GlobalAggregator Maven / Gradle / Ivy
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.aggregations.bucket.global;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.bucket.SingleBucketAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import java.io.IOException;
/**
*
*/
public class GlobalAggregator extends SingleBucketAggregator {
public GlobalAggregator(String name, AggregatorFactories subFactories, AggregationContext aggregationContext) {
super(name, subFactories, aggregationContext, null);
}
@Override
public void collect(int doc, long owningBucketOrdinal) throws IOException {
assert owningBucketOrdinal == 0 : "global aggregator can only be a top level aggregator";
collectBucket(doc, owningBucketOrdinal);
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
assert owningBucketOrdinal == 0 : "global aggregator can only be a top level aggregator";
return new InternalGlobal(name, bucketDocCount(owningBucketOrdinal), bucketAggregations(owningBucketOrdinal));
}
@Override
public InternalAggregation buildEmptyAggregation() {
throw new UnsupportedOperationException("global aggregations cannot serve as sub-aggregations, hence should never be called on #buildEmptyAggregations");
}
public static class Factory extends AggregatorFactory {
public Factory(String name) {
super(name, InternalGlobal.TYPE.name());
}
@Override
public Aggregator create(AggregationContext context, Aggregator parent, long expectedBucketsCount) {
if (parent != null) {
throw new AggregationExecutionException("Aggregation [" + parent.name() + "] cannot have a global " +
"sub-aggregation [" + name + "]. Global aggregations can only be defined as top level aggregations");
}
return new GlobalAggregator(name, factories, context);
}
}
}