package eu.dnetlib.pace.tree;

import eu.dnetlib.pace.distance.DistanceAlgo;
import eu.dnetlib.pace.distance.DistanceClass;
import eu.dnetlib.pace.model.Field;
import eu.dnetlib.pace.tree.support.Comparator;
import eu.dnetlib.pace.tree.support.ComparatorClass;

import java.util.Map;

/**
 * Not all fields of a document need to partecipate in the compare measure. We model those fields as having a
 * NullDistanceAlgo.
 */
@ComparatorClass("null")
public class NullDistanceAlgo implements Comparator {

	public NullDistanceAlgo(Map<String, Number> params){
	}

	@Override
	public double compare(Field a, Field b) {
		return 0;
	}
}