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Extensible parser for HQL/JP-QL queries

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/*
 * 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.ast.spi.predicate;

import java.util.ArrayList;
import java.util.List;

/**
 * A logical {@code AND} predicate.
 *
 * @author Gunnar Morling
 */
public abstract class ConjunctionPredicate extends AbstractPredicate implements ParentPredicate {

	protected final List> children = new ArrayList>( 3 );

	public ConjunctionPredicate() {
		super( Type.CONJUNCTION );
	}

	@Override
	public void add(Predicate predicate) {
		children.add( predicate );
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder( "( AND " );

		for ( Predicate child : children ) {
			sb.append( child.toString() ).append( " " );
		}

		sb.append( " )" );

		return sb.toString();
	}
}