/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
 * third-party contributors as indicated by either @author tags or express
 * copyright attribution statements applied by the authors.  All
 * third-party contributions are distributed under license by Red Hat Inc.
 *
 * 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, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY 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
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.ejb.criteria.predicate;

import java.io.Serializable;
import java.util.List;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Selection;

import org.hibernate.ejb.criteria.expression.ExpressionImpl;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;

/**
 * Basic template support for {@link Predicate} implementors providing
 * expression handling, negation and conjunction/disjunction handling.
 *
 * @author Steve Ebersole
 */
public abstract class AbstractPredicateImpl
		extends ExpressionImpl<Boolean>
		implements Predicate, Serializable {
	private boolean negated;

	protected AbstractPredicateImpl(CriteriaBuilderImpl criteriaBuilder) {
		super( criteriaBuilder, Boolean.class );
	}

	public boolean isNegated() {
		return negated;
	}

	public Predicate not() {
		negated = !negated;
		return this;
	}


	// Selection ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	@Override
	public final boolean isCompoundSelection() {
		// Should always be false for predicates
		return super.isCompoundSelection();
	}

	@Override
	public final List<Selection<?>> getCompoundSelectionItems() {
		// Should never have sub selection items for predicates
		return super.getCompoundSelectionItems();
	}

}
