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Predicate.java
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Predicate.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* 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 General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model.query.criteria;
import java.util.List;
/**
* The type of a simple or compound predicate: a conjunction or disjunction of
* restrictions. A simple predicate is considered to be a conjunction with a
* single conjunct.
*/
public interface Predicate extends Expression<Boolean> {
public static enum BooleanOperator {
AND, OR
}
/**
* Return the boolean operator for the predicate. If the predicate is
* simple, this is AND.
*
* @return boolean operator for the predicate
*/
BooleanOperator getOperator();
/**
* Whether the predicate has been created from another predicate by applying
* the Predicate not() method or the CriteriaBuilder not() method.
*
* @return boolean indicating if the predicate is
*
* a negated predicate
*/
boolean isNegated();
/**
* Return the top-level conjuncts or disjuncts of the predicate. Returns
* empty list if there are no top-level conjuncts or disjuncts of the
* predicate. Modifications to the list do not affect the query.
*
* @return list of boolean expressions forming the predicate
*/
List<Expression<Boolean>> getExpressions();
/**
* Create a negation of the predicate.
*
* @return negated predicate
*/
Predicate not();
}