org.jpmml.evaluator.VoteAggregator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015 Villu Ruusmann
 *
 * This file is part of JPMML-Evaluator
 *
 * JPMML-Evaluator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-Evaluator is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-Evaluator.  If not, see .
 */
package org.jpmml.evaluator;

import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

public class VoteAggregator extends KeyValueAggregator {

	public VoteAggregator(ValueFactory valueFactory){
		super(valueFactory, 0);
	}

	public void add(K key){
		add(key, Numbers.DOUBLE_ONE);
	}

	public ValueMap sumMap(){
		return new ValueMap<>(asTransformedMap(Vector::sum));
	}

	public Set getWinners(){
		Set result = new LinkedHashSet<>();

		Map> sumMap = sumMap();

		Value maxValue = Collections.max(sumMap.values());

		Collection>> entries = sumMap.entrySet();
		for(Map.Entry> entry : entries){
			K key = entry.getKey();
			Value value = entry.getValue();

			if((maxValue).compareTo(value) == 0){
				result.add(key);
			}
		}

		return result;
	}
}