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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.min;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.DoubleArray;
import org.elasticsearch.index.fielddata.DoubleValues;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.MetricsAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValueSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.numeric.NumericValuesSource;
import java.io.IOException;
/**
*
*/
public class MinAggregator extends MetricsAggregator.SingleValue {
private final NumericValuesSource valuesSource;
private DoubleArray mins;
public MinAggregator(String name, long estimatedBucketsCount, NumericValuesSource valuesSource, AggregationContext context, Aggregator parent) {
super(name, estimatedBucketsCount, context, parent);
this.valuesSource = valuesSource;
if (valuesSource != null) {
final long initialSize = estimatedBucketsCount < 2 ? 1 : estimatedBucketsCount;
mins = BigArrays.newDoubleArray(initialSize, context.pageCacheRecycler(), false);
mins.fill(0, mins.size(), Double.POSITIVE_INFINITY);
}
}
@Override
public boolean shouldCollect() {
return valuesSource != null;
}
@Override
public void collect(int doc, long owningBucketOrdinal) throws IOException {
assert valuesSource != null : "collect must only be called if #shouldCollect returns true";
DoubleValues values = valuesSource.doubleValues();
if (values == null || values.setDocument(doc) == 0) {
return;
}
if (owningBucketOrdinal >= mins.size()) {
long from = mins.size();
mins = BigArrays.grow(mins, owningBucketOrdinal + 1);
mins.fill(from, mins.size(), Double.POSITIVE_INFINITY);
}
mins.set(owningBucketOrdinal, Math.min(values.nextValue(), mins.get(owningBucketOrdinal)));
}
@Override
public double metric(long owningBucketOrd) {
return mins.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
if (valuesSource == null) {
return new InternalMin(name, Double.POSITIVE_INFINITY);
}
assert owningBucketOrdinal < mins.size();
return new InternalMin(name, mins.get(owningBucketOrdinal));
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalMin(name, Double.POSITIVE_INFINITY);
}
public static class Factory extends ValueSourceAggregatorFactory.LeafOnly {
public Factory(String name, ValuesSourceConfig valuesSourceConfig) {
super(name, InternalMin.TYPE.name(), valuesSourceConfig);
}
@Override
protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent) {
return new MinAggregator(name, 0, null, aggregationContext, parent);
}
@Override
protected Aggregator create(NumericValuesSource valuesSource, long expectedBucketsCount, AggregationContext aggregationContext, Aggregator parent) {
return new MinAggregator(name, expectedBucketsCount, valuesSource, aggregationContext, parent);
}
}
@Override
public void doRelease() {
Releasables.release(mins);
}
}