/*
* 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.query.criteria.internal.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
}