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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.percentiles.hdr;
import org.HdrHistogram.DoubleHistogram;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.PercentileRanks;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public class InternalHDRPercentileRanks extends AbstractInternalHDRPercentiles implements PercentileRanks {
public static final String NAME = "hdr_percentile_ranks";
public InternalHDRPercentileRanks(String name, double[] cdfValues, DoubleHistogram state, boolean keyed, DocValueFormat formatter,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
super(name, cdfValues, state, keyed, formatter, pipelineAggregators, metaData);
}
/**
* Read from a stream.
*/
public InternalHDRPercentileRanks(StreamInput in) throws IOException {
super(in);
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
public Iterator<Percentile> iterator() {
return new Iter(keys, state);
}
@Override
public double percent(double value) {
return percentileRank(state, value);
}
@Override
public String percentAsString(double value) {
return valueAsString(String.valueOf(value));
}
@Override
public double value(double key) {
return percent(key);
}
@Override
protected AbstractInternalHDRPercentiles createReduced(String name, double[] keys, DoubleHistogram merged, boolean keyed,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
return new InternalHDRPercentileRanks(name, keys, merged, keyed, format, pipelineAggregators, metaData);
}
static double percentileRank(DoubleHistogram state, double value) {
if (state.getTotalCount() == 0) {
return Double.NaN;
}
double percentileRank = state.getPercentileAtOrBelowValue(value);
if (percentileRank < 0) {
percentileRank = 0;
} else if (percentileRank > 100) {
percentileRank = 100;
}
return percentileRank;
}
public static class Iter implements Iterator<Percentile> {
private final double[] values;
private final DoubleHistogram state;
private int i;
public Iter(double[] values, DoubleHistogram state) {
this.values = values;
this.state = state;
i = 0;
}
@Override
public boolean hasNext() {
return i < values.length;
}
@Override
public Percentile next() {
final Percentile next = new Percentile(percentileRank(state, values[i]), values[i]);
++i;
return next;
}
@Override
public final void remove() {
throw new UnsupportedOperationException();
}
}
}