D-Net

package eu.dnetlib.pace.condition;

import java.util.List;

import com.google.common.collect.Iterables;

import eu.dnetlib.pace.config.Cond;

import eu.dnetlib.pace.distance.eval.ConditionEval;

import eu.dnetlib.pace.model.Field;

import eu.dnetlib.pace.model.FieldDef;

/**

 * Returns true if the number of values in the fields is the same.

 *

 * @author claudio

 */

public class SizeMatch extends AbstractCondition {

	/**

	 * Instantiates a new size match.

	 *

	 * @param fields

	 *            the fields

	 */

	public SizeMatch(final Cond cond, final List<FieldDef> fields) {

		super(cond, fields);

	}

	/*

	 * (non-Javadoc)

	 *

	 * @see eu.dnetlib.pace.condition.AbstractCondition#verify(eu.dnetlib.pace.model.FieldDef, java.util.List, java.util.List)

	 */

	@Override

	protected ConditionEval verify(final FieldDef fd, final Field a, final Field b) {

		// if (a.isEmpty() & b.isEmpty()) return 1;

		//

		// if (a.isEmpty()) return -1;

		// if (b.isEmpty()) return -1;

		return new ConditionEval(cond, a, b, Iterables.size(a) == Iterables.size(b) ? 1 : -1);

	}

	/**

	 * Checks if is empty.

	 *

	 * @param a

	 *            the a

	 * @return true, if is empty

	 */

	protected boolean isEmpty(final Iterable<?> a) {

		return (a == null) || Iterables.isEmpty(a);

	}

}