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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.bucketmetrics.stats;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorStreams;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.BucketMetricsPipelineAggregator;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class StatsBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
public final static Type TYPE = new Type("stats_bucket");
public final static PipelineAggregatorStreams.Stream STREAM = new PipelineAggregatorStreams.Stream() {
@Override
public StatsBucketPipelineAggregator readResult(StreamInput in) throws IOException {
StatsBucketPipelineAggregator result = new StatsBucketPipelineAggregator();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
PipelineAggregatorStreams.registerStream(STREAM, TYPE.stream());
InternalStatsBucket.registerStreams();
}
private double sum = 0;
private long count = 0;
private double min = Double.POSITIVE_INFINITY;
private double max = Double.NEGATIVE_INFINITY;
protected StatsBucketPipelineAggregator(String name, String[] bucketsPaths, GapPolicy gapPolicy, DocValueFormat formatter,
Map<String, Object> metaData) {
super(name, bucketsPaths, gapPolicy, formatter, metaData);
}
StatsBucketPipelineAggregator() {
// For serialization
}
@Override
public Type type() {
return TYPE;
}
@Override
protected void preCollection() {
sum = 0;
count = 0;
min = Double.POSITIVE_INFINITY;
max = Double.NEGATIVE_INFINITY;
}
@Override
protected void collectBucketValue(String bucketKey, Double bucketValue) {
sum += bucketValue;
min = Math.min(min, bucketValue);
max = Math.max(max, bucketValue);
count += 1;
}
@Override
protected InternalAggregation buildAggregation(List<PipelineAggregator> pipelineAggregators, Map<String, Object> metadata) {
return new InternalStatsBucket(name(), count, sum, min, max, format, pipelineAggregators, metadata);
}
}
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