org.opensearch.search.aggregations.bucket.terms.heuristic.PercentageScore Maven / Gradle / Ivy
/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.search.aggregations.bucket.terms.heuristic;
import org.opensearch.OpenSearchParseException;
import org.opensearch.common.io.stream.StreamInput;
import org.opensearch.common.io.stream.StreamOutput;
import org.opensearch.common.xcontent.ObjectParser;
import org.opensearch.common.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentParser;
import org.opensearch.index.query.QueryShardException;
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)) {
throw new OpenSearchParseException(
"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;
}
}
}