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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.tdigest;
import com.google.common.collect.UnmodifiableIterator;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.aggregations.AggregationStreams;
import org.elasticsearch.search.aggregations.metrics.percentiles.InternalPercentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentiles;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
*
*/
public class InternalTDigestPercentiles extends AbstractInternalTDigestPercentiles implements Percentiles {
public final static Type TYPE = new Type(Percentiles.TYPE_NAME, "t_digest_percentiles");
public final static AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalTDigestPercentiles readResult(StreamInput in) throws IOException {
InternalTDigestPercentiles result = new InternalTDigestPercentiles();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
AggregationStreams.registerStream(STREAM, TYPE.stream());
}
InternalTDigestPercentiles() {
} // for serialization
public InternalTDigestPercentiles(String name, double[] percents, TDigestState state, boolean keyed, ValueFormatter formatter,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
super(name, percents, state, keyed, formatter, pipelineAggregators, metaData);
}
@Override
public Iterator<Percentile> iterator() {
return new Iter(keys, state);
}
@Override
public double percentile(double percent) {
return state.quantile(percent / 100);
}
@Override
public String percentileAsString(double percent) {
return valueAsString(String.valueOf(percent));
}
@Override
public double value(double key) {
return percentile(key);
}
@Override
protected AbstractInternalTDigestPercentiles createReduced(String name, double[] keys, TDigestState merged, boolean keyed,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
return new InternalTDigestPercentiles(name, keys, merged, keyed, valueFormatter, pipelineAggregators, metaData);
}
@Override
public Type type() {
return TYPE;
}
public static class Iter extends UnmodifiableIterator<Percentile> {
private final double[] percents;
private final TDigestState state;
private int i;
public Iter(double[] percents, TDigestState state) {
this.percents = percents;
this.state = state;
i = 0;
}
@Override
public boolean hasNext() {
return i < percents.length;
}
@Override
public Percentile next() {
final Percentile next = new InternalPercentile(percents[i], state.quantile(percents[i] / 100));
++i;
return next;
}
}
}