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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.metrics;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.xcontent.ObjectParser;
import java.io.IOException;
/**
* An enum representing the methods for calculating percentiles
*/
public enum PercentilesMethod implements Writeable {
/**
* The TDigest method for calculating percentiles
*/
TDIGEST("tdigest", "TDigest", "TDIGEST") {
@Override
PercentilesConfig configFromStream(StreamInput in) throws IOException {
return new PercentilesConfig.TDigest(in);
}
},
/**
* The HDRHistogram method of calculating percentiles
*/
HDR("hdr", "HDR") {
@Override
PercentilesConfig configFromStream(StreamInput in) throws IOException {
return new PercentilesConfig.Hdr(in);
}
};
public static final ParseField COMPRESSION_FIELD = new ParseField("compression");
public static final ParseField NUMBER_SIGNIFICANT_DIGITS_FIELD = new ParseField("number_of_significant_value_digits");
public static final ObjectParser TDIGEST_PARSER;
static {
TDIGEST_PARSER = new ObjectParser<>(PercentilesMethod.TDIGEST.getParseField().getPreferredName(), PercentilesConfig.TDigest::new);
TDIGEST_PARSER.declareDouble(PercentilesConfig.TDigest::setCompression, COMPRESSION_FIELD);
}
public static final ObjectParser HDR_PARSER;
static {
HDR_PARSER = new ObjectParser<>(PercentilesMethod.HDR.getParseField().getPreferredName(), PercentilesConfig.Hdr::new);
HDR_PARSER.declareInt(PercentilesConfig.Hdr::setNumberOfSignificantValueDigits, NUMBER_SIGNIFICANT_DIGITS_FIELD);
}
private final ParseField parseField;
PercentilesMethod(String name, String... deprecatedNames) {
this.parseField = new ParseField(name, deprecatedNames);
}
abstract PercentilesConfig configFromStream(StreamInput in) throws IOException;
/**
* @return the name of the method
*/
public ParseField getParseField() {
return parseField;
}
public static PercentilesMethod readFromStream(StreamInput in) throws IOException {
return in.readEnum(PercentilesMethod.class);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeEnum(this);
}
@Override
public String toString() {
return parseField.getPreferredName();
}
}