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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.bucket.terms.heuristic;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.index.query.QueryShardException;
import org.elasticsearch.xcontent.ObjectParser;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
public class PercentageScore extends SignificanceHeuristic {
public static final String NAME = "percentage";
public static final ObjectParser PARSER = new ObjectParser<>(NAME, PercentageScore::new);
public PercentageScore() {}
public PercentageScore(StreamInput in) {
// Nothing to read.
}
@Override
public void writeTo(StreamOutput out) throws IOException {}
@Override
public String getWriteableName() {
return NAME;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME).endObject();
return builder;
}
public static SignificanceHeuristic parse(XContentParser parser) throws IOException, QueryShardException {
// move to the closing bracket
if (parser.nextToken().equals(XContentParser.Token.END_OBJECT) == false) {
throw new ElasticsearchParseException(
"failed to parse [percentage] significance heuristic. expected an empty object, " + "but got [{}] instead",
parser.currentToken()
);
}
return new PercentageScore();
}
/**
* Indicates the significance of a term in a sample by determining what percentage
* of all occurrences of a term are found in the sample.
*/
@Override
public double getScore(long subsetFreq, long subsetSize, long supersetFreq, long supersetSize) {
checkFrequencyValidity(subsetFreq, subsetSize, supersetFreq, supersetSize, "PercentageScore");
if (supersetFreq == 0) {
// avoid a divide by zero issue
return 0;
}
return (double) subsetFreq / (double) supersetFreq;
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != getClass()) {
return false;
}
return true;
}
@Override
public int hashCode() {
return getClass().hashCode();
}
public static class PercentageScoreBuilder implements SignificanceHeuristicBuilder {
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME).endObject();
return builder;
}
}
}