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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.avg;
import org.apache.lucene.index.AtomicReaderContext;
import org.elasticsearch.common.inject.internal.Nullable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.DoubleArray;
import org.elasticsearch.common.util.LongArray;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.NumericMetricsAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import java.io.IOException;
/**
*
*/
public class AvgAggregator extends NumericMetricsAggregator.SingleValue {
private final ValuesSource.Numeric valuesSource;
private SortedNumericDoubleValues values;
private LongArray counts;
private DoubleArray sums;
private ValueFormatter formatter;
public AvgAggregator(String name, long estimatedBucketsCount, ValuesSource.Numeric valuesSource, @Nullable ValueFormatter formatter,
AggregationContext context, Aggregator parent) {
super(name, estimatedBucketsCount, context, parent);
this.valuesSource = valuesSource;
this.formatter = formatter;
if (valuesSource != null) {
final long initialSize = estimatedBucketsCount < 2 ? 1 : estimatedBucketsCount;
counts = bigArrays.newLongArray(initialSize, true);
sums = bigArrays.newDoubleArray(initialSize, true);
}
}
@Override
public boolean shouldCollect() {
return valuesSource != null;
}
@Override
public void setNextReader(AtomicReaderContext reader) {
values = valuesSource.doubleValues();
}
@Override
public void collect(int doc, long owningBucketOrdinal) throws IOException {
counts = bigArrays.grow(counts, owningBucketOrdinal + 1);
sums = bigArrays.grow(sums, owningBucketOrdinal + 1);
values.setDocument(doc);
final int valueCount = values.count();
counts.increment(owningBucketOrdinal, valueCount);
double sum = 0;
for (int i = 0; i < valueCount; i++) {
sum += values.valueAt(i);
}
sums.increment(owningBucketOrdinal, sum);
}
@Override
public double metric(long owningBucketOrd) {
return valuesSource == null ? Double.NaN : sums.get(owningBucketOrd) / counts.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
if (valuesSource == null || owningBucketOrdinal >= counts.size()) {
return new InternalAvg(name, 0l, 0, formatter);
}
return new InternalAvg(name, sums.get(owningBucketOrdinal), counts.get(owningBucketOrdinal), formatter);
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalAvg(name, 0.0, 0l, formatter);
}
public static class Factory extends ValuesSourceAggregatorFactory.LeafOnly {
public Factory(String name, String type, ValuesSourceConfig valuesSourceConfig) {
super(name, type, valuesSourceConfig);
}
@Override
protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent) {
return new AvgAggregator(name, 0, null, config.formatter(), aggregationContext, parent);
}
@Override
protected Aggregator create(ValuesSource.Numeric valuesSource, long expectedBucketsCount, AggregationContext aggregationContext,
Aggregator parent) {
return new AvgAggregator(name, expectedBucketsCount, valuesSource, config.formatter(), aggregationContext, parent);
}
}
@Override
public void doClose() {
Releasables.close(counts, sums);
}
}