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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.max;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.BucketMetricsPipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.InternalBucketMetricValue;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class MaxBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
private List<String> maxBucketKeys;
private double maxValue;
protected MaxBucketPipelineAggregator(String name, String[] bucketsPaths, GapPolicy gapPolicy, DocValueFormat formatter,
Map<String, Object> metaData) {
super(name, bucketsPaths, gapPolicy, formatter, metaData);
}
/**
* Read from a stream.
*/
public MaxBucketPipelineAggregator(StreamInput in) throws IOException {
super(in);
}
@Override
public String getWriteableName() {
return MaxBucketPipelineAggregationBuilder.NAME;
}
@Override
protected void preCollection() {
maxBucketKeys = new ArrayList<>();
maxValue = Double.NEGATIVE_INFINITY;
}
@Override
protected void collectBucketValue(String bucketKey, Double bucketValue) {
if (bucketValue > maxValue) {
maxBucketKeys.clear();
maxBucketKeys.add(bucketKey);
maxValue = bucketValue;
} else if (bucketValue.equals(maxValue)) {
maxBucketKeys.add(bucketKey);
}
}
@Override
protected InternalAggregation buildAggregation(List<PipelineAggregator> pipelineAggregators, Map<String, Object> metadata) {
String[] keys = maxBucketKeys.toArray(new String[maxBucketKeys.size()]);
return new InternalBucketMetricValue(name(), keys, maxValue, format, Collections.emptyList(), metaData());
}
}