org.elasticsearch.search.aggregations.bucket.filter.FilterAggregator Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.aggregations.bucket.filter;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.lucene.ReaderContextAware;
import org.elasticsearch.common.lucene.docset.DocIdSets;
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;
/**
* Aggregate all docs that match a filter.
*/
public class FilterAggregator extends SingleBucketAggregator implements ReaderContextAware {
private final Filter filter;
private Bits bits;
public FilterAggregator(String name,
org.apache.lucene.search.Filter filter,
AggregatorFactories factories,
AggregationContext aggregationContext,
Aggregator parent) {
super(name, factories, aggregationContext, parent);
this.filter = filter;
}
@Override
public void setNextReader(AtomicReaderContext reader) {
try {
bits = DocIdSets.toSafeBits(reader.reader(), filter.getDocIdSet(reader, reader.reader().getLiveDocs()));
} catch (IOException ioe) {
throw new AggregationExecutionException("Failed to aggregate filter aggregator [" + name + "]", ioe);
}
}
@Override
public void collect(int doc, long owningBucketOrdinal) throws IOException {
if (bits.get(doc)) {
collectBucket(doc, owningBucketOrdinal);
}
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
return new InternalFilter(name, bucketDocCount(owningBucketOrdinal), bucketAggregations(owningBucketOrdinal));
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalFilter(name, 0, buildEmptySubAggregations());
}
public static class Factory extends AggregatorFactory {
private org.apache.lucene.search.Filter filter;
public Factory(String name, Filter filter) {
super(name, InternalFilter.TYPE.name());
this.filter = filter;
}
@Override
public Aggregator create(AggregationContext context, Aggregator parent, long expectedBucketsCount) {
FilterAggregator aggregator = new FilterAggregator(name, filter, factories, context, parent);
context.registerReaderContextAware(aggregator);
return aggregator;
}
}
}