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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.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.bucket.histogram.InternalHistogram;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.InternalSimpleValue;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorStreams;
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 {
public static final Type TYPE = new Type("cumulative_sum");
public static final PipelineAggregatorStreams.Stream STREAM = in -> {
CumulativeSumPipelineAggregator result = new CumulativeSumPipelineAggregator();
result.readFrom(in);
return result;
};
public static void registerStreams() {
PipelineAggregatorStreams.registerStream(STREAM, TYPE.stream());
}
private DocValueFormat formatter;
public CumulativeSumPipelineAggregator() {
}
public CumulativeSumPipelineAggregator(String name, String[] bucketsPaths, DocValueFormat formatter,
Map<String, Object> metadata) {
super(name, bucketsPaths, metadata);
this.formatter = formatter;
}
@Override
public Type type() {
return TYPE;
}
@Override
public InternalAggregation reduce(InternalAggregation aggregation, ReduceContext reduceContext) {
InternalHistogram histo = (InternalHistogram) aggregation;
List<? extends InternalHistogram.Bucket> buckets = histo.getBuckets();
InternalHistogram.Factory<? extends InternalHistogram.Bucket> factory = histo.getFactory();
List newBuckets = new ArrayList<>();
double sum = 0;
for (InternalHistogram.Bucket bucket : buckets) {
Double thisBucketValue = resolveBucketValue(histo, bucket, bucketsPaths()[0], GapPolicy.INSERT_ZEROS);
sum += thisBucketValue;
List<InternalAggregation> aggs = StreamSupport.stream(bucket.getAggregations().spliterator(), false).map((p) -> {
return (InternalAggregation) p;
}).collect(Collectors.toList());
aggs.add(new InternalSimpleValue(name(), sum, formatter, new ArrayList<PipelineAggregator>(), metaData()));
InternalHistogram.Bucket newBucket = factory.createBucket(bucket.getKey(), bucket.getDocCount(),
new InternalAggregations(aggs), bucket.getKeyed(), bucket.getFormatter());
newBuckets.add(newBucket);
}
return factory.create(newBuckets, histo);
}
@Override
public void doReadFrom(StreamInput in) throws IOException {
formatter = in.readNamedWriteable(DocValueFormat.class);
}
@Override
public void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(formatter);
}
}
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