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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.filter;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Weight;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.bucket.SingleBucketAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* Aggregate all docs that match a filter.
*/
public class FilterAggregator extends SingleBucketAggregator {
private final Weight filter;
public FilterAggregator(String name,
Weight filter,
AggregatorFactories factories,
AggregationContext aggregationContext,
Aggregator parent, List pipelineAggregators,
Map metaData) throws IOException {
super(name, factories, aggregationContext, parent, pipelineAggregators, metaData);
this.filter = filter;
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
// no need to provide deleted docs to the filter
final Bits bits = Lucene.asSequentialAccessBits(ctx.reader().maxDoc(), filter.scorer(ctx));
return new LeafBucketCollectorBase(sub, null) {
@Override
public void collect(int doc, long bucket) throws IOException {
if (bits.get(doc)) {
collectBucket(sub, doc, bucket);
}
}
};
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) throws IOException {
return new InternalFilter(name, bucketDocCount(owningBucketOrdinal), bucketAggregations(owningBucketOrdinal), pipelineAggregators(),
metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalFilter(name, 0, buildEmptySubAggregations(), pipelineAggregators(), metaData());
}
public static class Factory extends AggregatorFactory {
private final Query filter;
public Factory(String name, Query filter) {
super(name, InternalFilter.TYPE.name());
this.filter = filter;
}
// TODO: refactor in order to initialize the factory once with its parent,
// the context, etc. and then have a no-arg lightweight create method
// (since create may be called thousands of times)
private IndexSearcher searcher;
private Weight weight;
@Override
public Aggregator createInternal(AggregationContext context, Aggregator parent, boolean collectsFromSingleBucket,
List pipelineAggregators, Map metaData) throws IOException {
IndexSearcher contextSearcher = context.searchContext().searcher();
if (searcher != contextSearcher) {
searcher = contextSearcher;
weight = contextSearcher.createNormalizedWeight(filter, false);
}
return new FilterAggregator(name, weight, factories, context, parent, pipelineAggregators, metaData);
}
}
}