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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.max;
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.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.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.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;
import java.util.List;
import java.util.Map;
/**
*
*/
public class MaxAggregator extends NumericMetricsAggregator.SingleValue {
final ValuesSource.Numeric valuesSource;
final ValueFormatter formatter;
DoubleArray maxes;
public MaxAggregator(String name, ValuesSource.Numeric valuesSource, ValueFormatter formatter,
AggregationContext context,
Aggregator parent, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
this.formatter = formatter;
if (valuesSource != null) {
maxes = context.bigArrays().newDoubleArray(1, false);
maxes.fill(0, maxes.size(), Double.NEGATIVE_INFINITY);
}
}
@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 allValues = valuesSource.doubleValues(ctx);
final NumericDoubleValues values = MultiValueMode.MAX.select(allValues, Double.NEGATIVE_INFINITY);
return new LeafBucketCollectorBase(sub, allValues) {
@Override
public void collect(int doc, long bucket) throws IOException {
if (bucket >= maxes.size()) {
long from = maxes.size();
maxes = bigArrays.grow(maxes, bucket + 1);
maxes.fill(from, maxes.size(), Double.NEGATIVE_INFINITY);
}
final double value = values.get(doc);
double max = maxes.get(bucket);
max = Math.max(max, value);
maxes.set(bucket, max);
}
};
}
@Override
public double metric(long owningBucketOrd) {
if (valuesSource == null || owningBucketOrd >= maxes.size()) {
return Double.NEGATIVE_INFINITY;
}
return maxes.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long bucket) {
if (valuesSource == null || bucket >= maxes.size()) {
return buildEmptyAggregation();
}
return new InternalMax(name, maxes.get(bucket), formatter, pipelineAggregators(), metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalMax(name, Double.NEGATIVE_INFINITY, formatter, pipelineAggregators(), metaData());
}
public static class Factory extends ValuesSourceAggregatorFactory.LeafOnly<ValuesSource.Numeric> {
public Factory(String name, ValuesSourceConfig<ValuesSource.Numeric> valuesSourceConfig) {
super(name, InternalMax.TYPE.name(), valuesSourceConfig);
}
@Override
protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
return new MaxAggregator(name, null, config.formatter(), aggregationContext, parent, pipelineAggregators, metaData);
}
@Override
protected Aggregator doCreateInternal(ValuesSource.Numeric valuesSource, AggregationContext aggregationContext, Aggregator parent,
boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
return new MaxAggregator(name, valuesSource, config.formatter(), aggregationContext, parent, pipelineAggregators, metaData);
}
}
@Override
public void doClose() {
Releasables.close(maxes);
}
}