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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.filters;
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.InternalAggregations;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.bucket.BucketsAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
*
*/
public class FiltersAggregator extends BucketsAggregator {
static class KeyedFilter {
final String key;
final Query filter;
KeyedFilter(String key, Query filter) {
this.key = key;
this.filter = filter;
}
}
private final String[] keys;
private final Weight[] filters;
private final boolean keyed;
private final boolean showOtherBucket;
private final String otherBucketKey;
private final int totalNumKeys;
public FiltersAggregator(String name, AggregatorFactories factories, String[] keys, Weight[] filters, boolean keyed, String otherBucketKey,
AggregationContext aggregationContext,
Aggregator parent, List pipelineAggregators, Map metaData)
throws IOException {
super(name, factories, aggregationContext, parent, pipelineAggregators, metaData);
this.keyed = keyed;
this.keys = keys;
this.filters = filters;
this.showOtherBucket = otherBucketKey != null;
this.otherBucketKey = otherBucketKey;
if (showOtherBucket) {
this.totalNumKeys = keys.length + 1;
} else {
this.totalNumKeys = keys.length;
}
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
// no need to provide deleted docs to the filter
final Bits[] bits = new Bits[filters.length];
for (int i = 0; i < filters.length; ++i) {
bits[i] = Lucene.asSequentialAccessBits(ctx.reader().maxDoc(), filters[i].scorer(ctx));
}
return new LeafBucketCollectorBase(sub, null) {
@Override
public void collect(int doc, long bucket) throws IOException {
boolean matched = false;
for (int i = 0; i < bits.length; i++) {
if (bits[i].get(doc)) {
collectBucket(sub, doc, bucketOrd(bucket, i));
matched = true;
}
}
if (showOtherBucket && !matched) {
collectBucket(sub, doc, bucketOrd(bucket, bits.length));
}
}
};
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) throws IOException {
List buckets = new ArrayList<>(filters.length);
for (int i = 0; i < keys.length; i++) {
long bucketOrd = bucketOrd(owningBucketOrdinal, i);
InternalFilters.Bucket bucket = new InternalFilters.Bucket(keys[i], bucketDocCount(bucketOrd), bucketAggregations(bucketOrd), keyed);
buckets.add(bucket);
}
// other bucket
if (showOtherBucket) {
long bucketOrd = bucketOrd(owningBucketOrdinal, keys.length);
InternalFilters.Bucket bucket = new InternalFilters.Bucket(otherBucketKey, bucketDocCount(bucketOrd),
bucketAggregations(bucketOrd), keyed);
buckets.add(bucket);
}
return new InternalFilters(name, buckets, keyed, pipelineAggregators(), metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
InternalAggregations subAggs = buildEmptySubAggregations();
List buckets = new ArrayList<>(filters.length);
for (int i = 0; i < keys.length; i++) {
InternalFilters.Bucket bucket = new InternalFilters.Bucket(keys[i], 0, subAggs, keyed);
buckets.add(bucket);
}
if (showOtherBucket) {
InternalFilters.Bucket bucket = new InternalFilters.Bucket(otherBucketKey, 0, subAggs, keyed);
buckets.add(bucket);
}
return new InternalFilters(name, buckets, keyed, pipelineAggregators(), metaData());
}
final long bucketOrd(long owningBucketOrdinal, int filterOrd) {
return owningBucketOrdinal * totalNumKeys + filterOrd;
}
public static class Factory extends AggregatorFactory {
private final List filters;
private final String[] keys;
private final boolean keyed;
private final String otherBucketKey;
public Factory(String name, List filters, boolean keyed, String otherBucketKey) {
super(name, InternalFilters.TYPE.name());
this.filters = filters;
this.keyed = keyed;
this.otherBucketKey = otherBucketKey;
this.keys = new String[filters.size()];
for (int i = 0; i < filters.size(); ++i) {
KeyedFilter keyedFilter = filters.get(i);
this.keys[i] = keyedFilter.key;
}
}
// 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[] weights;
@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;
weights = new Weight[filters.size()];
for (int i = 0; i < filters.size(); ++i) {
KeyedFilter keyedFilter = filters.get(i);
this.weights[i] = contextSearcher.createNormalizedWeight(keyedFilter.filter, false);
}
}
return new FiltersAggregator(name, factories, keys, weights, keyed, otherBucketKey, context, parent, pipelineAggregators, metaData);
}
}
}