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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.envers.query.criteria.internal;

import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.internal.entities.RelationDescription;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.envers.internal.tools.query.Parameters;
import org.hibernate.envers.internal.tools.query.QueryBuilder;
import org.hibernate.envers.query.internal.property.PropertyNameGetter;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public class NullAuditExpression extends AbstractAtomicExpression {
	private PropertyNameGetter propertyNameGetter;

	public NullAuditExpression(String alias, PropertyNameGetter propertyNameGetter) {
		super( alias );
		this.propertyNameGetter = propertyNameGetter;
	}

	@Override
	protected void addToQuery(
			EnversService enversService,
			AuditReaderImplementor versionsReader,
			String entityName,
			String alias,
			QueryBuilder qb,
			Parameters parameters) {
		String propertyName = CriteriaTools.determinePropertyName(
				enversService,
				versionsReader,
				entityName,
				propertyNameGetter
		);
		RelationDescription relatedEntity = CriteriaTools.getRelatedEntity( enversService, entityName, propertyName );

		if ( relatedEntity == null ) {
			parameters.addNullRestriction( alias, propertyName );
		}
		else {
			relatedEntity.getIdMapper().addIdEqualsToQuery( parameters, null, alias, null, true );
		}
	}
}