LuceneConjunctionPredicate.java

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * JBoss, Home of Professional Open Source
 * Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors
 * as indicated by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */
package org.hibernate.hql.lucene.internal.builder.predicate;

import org.apache.lucene.search.Query;
import org.hibernate.hql.ast.spi.predicate.ConjunctionPredicate;
import org.hibernate.hql.ast.spi.predicate.Predicate;
import org.hibernate.search.query.dsl.BooleanJunction;
import org.hibernate.search.query.dsl.QueryBuilder;

/**
 * Lucene-based {@code AND} predicate.
 *
 * @author Gunnar Morling
 */
public class LuceneConjunctionPredicate extends ConjunctionPredicate<Query> {

	private final QueryBuilder builder;

	public LuceneConjunctionPredicate(QueryBuilder builder) {
		this.builder = builder;
	}

	@Override
	public Query getQuery() {
		BooleanJunction<BooleanJunction> booleanJunction = builder.bool();

		for ( Predicate<Query> predicate : children ) {
			// minor optimization: unwrap negated predicates and add child directly to this
			// predicate
			if ( predicate.getType() == Type.NEGATION ) {
				booleanJunction.must( predicate.as( LuceneNegationPredicate.class ).getChild().getQuery() ).not();
			}
			else {
				booleanJunction.must( predicate.getQuery() );
			}
		}

		return booleanJunction.createQuery();
	}
}