package eu.dnetlib.pace.tree;

import java.util.List;
import java.util.Map;

import eu.dnetlib.pace.config.Config;
import eu.dnetlib.pace.tree.support.AbstractListComparator;
import eu.dnetlib.pace.tree.support.ComparatorClass;

/**
 * Returns true if the number of values in the fields is the same.
 *
 * @author claudio
 */
@ComparatorClass("sizeMatch")
public class SizeMatch extends AbstractListComparator {

	/**
	 * Instantiates a new size match.
	 *
	 * @param params
	 *            the parameters
	 */
	public SizeMatch(final Map<String, String> params) {
		super(params);
	}

	@Override
	public double compare(final List<String> a, final List<String> b, final Config conf) {

		if (a.isEmpty() || b.isEmpty())
			return -1.0;

		return a.size() == b.size() ? 1.0 : 0.0;
	}

}