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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.metrics.sum;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.DoubleArray;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.metrics.NumericMetricsAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class SumAggregator extends NumericMetricsAggregator.SingleValue {
private final ValuesSource.Numeric valuesSource;
private final DocValueFormat format;
private DoubleArray sums;
SumAggregator(String name, ValuesSource.Numeric valuesSource, DocValueFormat formatter, SearchContext context,
Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
this.format = formatter;
if (valuesSource != null) {
sums = context.bigArrays().newDoubleArray(1, true);
}
}
@Override
public boolean needsScores() {
return valuesSource != null && valuesSource.needsScores();
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
if (valuesSource == null) {
return LeafBucketCollector.NO_OP_COLLECTOR;
}
final BigArrays bigArrays = context.bigArrays();
final SortedNumericDoubleValues values = valuesSource.doubleValues(ctx);
return new LeafBucketCollectorBase(sub, values) {
@Override
public void collect(int doc, long bucket) throws IOException {
sums = bigArrays.grow(sums, bucket + 1);
values.setDocument(doc);
final int valuesCount = values.count();
double sum = 0;
for (int i = 0; i < valuesCount; i++) {
sum += values.valueAt(i);
}
sums.increment(bucket, sum);
}
};
}
@Override
public double metric(long owningBucketOrd) {
if (valuesSource == null || owningBucketOrd >= sums.size()) {
return 0.0;
}
return sums.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long bucket) {
if (valuesSource == null || bucket >= sums.size()) {
return buildEmptyAggregation();
}
return new InternalSum(name, sums.get(bucket), format, pipelineAggregators(), metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalSum(name, 0.0, format, pipelineAggregators(), metaData());
}
@Override
public void doClose() {
Releasables.close(sums);
}
}
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