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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.mad;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.ObjectArray;
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.metrics.percentiles.tdigest.TDigestState;
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;
import java.util.Objects;
import static org.elasticsearch.search.aggregations.metrics.mad.InternalMedianAbsoluteDeviation.computeMedianAbsoluteDeviation;
public class MedianAbsoluteDeviationAggregator extends NumericMetricsAggregator.SingleValue {
private final ValuesSource.Numeric valuesSource;
private final DocValueFormat format;
private final double compression;
private ObjectArray valueSketches;
MedianAbsoluteDeviationAggregator(String name,
SearchContext context,
Aggregator parent,
List pipelineAggregators,
Map metaData,
@Nullable ValuesSource.Numeric valuesSource,
DocValueFormat format,
double compression) throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
this.format = Objects.requireNonNull(format);
this.compression = compression;
this.valueSketches = context.bigArrays().newObjectArray(1);
}
private boolean hasDataForBucket(long bucketOrd) {
return bucketOrd < valueSketches.size() && valueSketches.get(bucketOrd) != null;
}
@Override
public double metric(long owningBucketOrd) {
if (hasDataForBucket(owningBucketOrd)) {
return computeMedianAbsoluteDeviation(valueSketches.get(owningBucketOrd));
} else {
return Double.NaN;
}
}
@Override
public boolean needsScores() {
return valuesSource != null && valuesSource.needsScores();
}
@Override
protected LeafBucketCollector getLeafCollector(LeafReaderContext ctx, 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 {
valueSketches = bigArrays.grow(valueSketches, bucket + 1);
TDigestState valueSketch = valueSketches.get(bucket);
if (valueSketch == null) {
valueSketch = new TDigestState(compression);
valueSketches.set(bucket, valueSketch);
}
if (values.advanceExact(doc)) {
final int valueCount = values.docValueCount();
for (int i = 0; i < valueCount; i++) {
final double value = values.nextValue();
valueSketch.add(value);
}
}
}
};
}
@Override
public InternalAggregation buildAggregation(long bucket) throws IOException {
if (hasDataForBucket(bucket)) {
final TDigestState valueSketch = valueSketches.get(bucket);
return new InternalMedianAbsoluteDeviation(name, pipelineAggregators(), metaData(), format, valueSketch);
} else {
return buildEmptyAggregation();
}
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalMedianAbsoluteDeviation(name, pipelineAggregators(), metaData(), format, new TDigestState(compression));
}
@Override
public void doClose() {
Releasables.close(valueSketches);
}
}