/*
* 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;
/**
* Models what ANSI-SQL terms a <i>truth value</i>. Specifically, ANSI-SQL defines <tt>TRUE</tt>, <tt>FALSE</tt> and
* <tt>UNKNOWN</tt> as <i>truth values</i>. These <i>truth values</i> are used to explicitly check the result of a
* boolean expression (the syntax is like <tt>a > b IS TRUE</tt>. <tt>IS TRUE</tt> is the assumed default.
* <p/>
* JPA defines support for only <tt>IS TRUE</tt> and <tt>IS FALSE</tt>, not <tt>IS UNKNOWN</tt> (<tt>a > NULL</tt>
* is an example where the result would be UNKNOWN). All 3 are provided here for completness.
*
* @author Steve Ebersole
*/
public enum TruthValue {
TRUE,
FALSE,
UNKNOWN
}