org.elasticsearch.search.aggregations.pipeline.cumulativesum.CumulativeSumPipelineAggregator Maven / Gradle / Ivy
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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.pipeline.cumulativesum;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.ReduceContext;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation.Bucket;
import org.elasticsearch.search.aggregations.bucket.histogram.HistogramFactory;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.InternalSimpleValue;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.elasticsearch.search.aggregations.pipeline.BucketHelpers.resolveBucketValue;
public class CumulativeSumPipelineAggregator extends PipelineAggregator {
private final DocValueFormat formatter;
public CumulativeSumPipelineAggregator(String name, String[] bucketsPaths, DocValueFormat formatter,
Map metadata) {
super(name, bucketsPaths, metadata);
this.formatter = formatter;
}
/**
* Read from a stream.
*/
public CumulativeSumPipelineAggregator(StreamInput in) throws IOException {
super(in);
formatter = in.readNamedWriteable(DocValueFormat.class);
}
@Override
public void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(formatter);
}
@Override
public String getWriteableName() {
return CumulativeSumPipelineAggregationBuilder.NAME;
}
@Override
public InternalAggregation reduce(InternalAggregation aggregation, ReduceContext reduceContext) {
MultiBucketsAggregation histo = (MultiBucketsAggregation) aggregation;
List buckets = histo.getBuckets();
HistogramFactory factory = (HistogramFactory) histo;
List newBuckets = new ArrayList<>();
double sum = 0;
for (Bucket bucket : buckets) {
Double thisBucketValue = resolveBucketValue(histo, bucket, bucketsPaths()[0], GapPolicy.INSERT_ZEROS);
sum += thisBucketValue;
List aggs = StreamSupport.stream(bucket.getAggregations().spliterator(), false).map((p) -> {
return (InternalAggregation) p;
}).collect(Collectors.toList());
aggs.add(new InternalSimpleValue(name(), sum, formatter, new ArrayList(), metaData()));
Bucket newBucket = factory.createBucket(factory.getKey(bucket), bucket.getDocCount(), new InternalAggregations(aggs));
newBuckets.add(newBucket);
}
return factory.createAggregation(newBuckets);
}
}