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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.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.DoubleArray;
import org.elasticsearch.index.fielddata.NumericDoubleValues;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.search.MultiValueMode;
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 java.io.IOException;
import java.util.Map;
/**
*
*/
public class MinAggregator extends NumericMetricsAggregator.SingleValue {
private final ValuesSource.Numeric valuesSource;
private NumericDoubleValues values;
private DoubleArray mins;
public MinAggregator(String name, long estimatedBucketsCount, ValuesSource.Numeric valuesSource, AggregationContext context, Aggregator parent, Map<String, Object> metaData) {
super(name, estimatedBucketsCount, context, parent, metaData);
this.valuesSource = valuesSource;
if (valuesSource != null) {
final long initialSize = estimatedBucketsCount < 2 ? 1 : estimatedBucketsCount;
mins = bigArrays.newDoubleArray(initialSize, false);
mins.fill(0, mins.size(), Double.POSITIVE_INFINITY);
}
}
@Override
public boolean shouldCollect() {
return valuesSource != null;
}
@Override
public void setNextReader(LeafReaderContext reader) {
final SortedNumericDoubleValues values = valuesSource.doubleValues();
this.values = MultiValueMode.MIN.select(values, Double.POSITIVE_INFINITY);
}
@Override
public void collect(int doc, long owningBucketOrdinal) throws IOException {
if (owningBucketOrdinal >= mins.size()) {
long from = mins.size();
mins = bigArrays.grow(mins, owningBucketOrdinal + 1);
mins.fill(from, mins.size(), Double.POSITIVE_INFINITY);
}
final double value = values.get(doc);
double min = mins.get(owningBucketOrdinal);
min = Math.min(min, value);
mins.set(owningBucketOrdinal, min);
}
@Override
public double metric(long owningBucketOrd) {
return valuesSource == null ? Double.POSITIVE_INFINITY : mins.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
if (valuesSource == null) {
return new InternalMin(name, Double.POSITIVE_INFINITY, getMetaData());
}
assert owningBucketOrdinal < mins.size();
return new InternalMin(name, mins.get(owningBucketOrdinal), getMetaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalMin(name, Double.POSITIVE_INFINITY, getMetaData());
}
public static class Factory extends ValuesSourceAggregatorFactory.LeafOnly<ValuesSource.Numeric, Map<String,Object>> {
public Factory(String name, ValuesSourceConfig<ValuesSource.Numeric> valuesSourceConfig) {
super(name, InternalMin.TYPE.name(), valuesSourceConfig);
}
@Override
protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent, Map<String, Object> metaData) {
return new MinAggregator(name, 0, null, aggregationContext, parent, metaData);
}
@Override
protected Aggregator create(ValuesSource.Numeric valuesSource, long expectedBucketsCount, AggregationContext aggregationContext, Aggregator parent, Map<String, Object> metaData) {
return new MinAggregator(name, expectedBucketsCount, valuesSource, aggregationContext, parent, metaData);
}
}
@Override
public void doClose() {
Releasables.close(mins);
}
}