/*
* 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;
import java.io.Serializable;
import java.util.Collection;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
import org.hibernate.query.criteria.internal.expression.UnaryOperatorExpression;
import org.hibernate.query.criteria.internal.path.PluralAttributePath;
/**
* Models an <tt>IS [NOT] EMPTY</tt> restriction
*
* @author Steve Ebersole
*/
public class IsEmptyPredicate<C extends Collection>
extends AbstractSimplePredicate
implements UnaryOperatorExpression<Boolean>, Serializable {
private final PluralAttributePath<C> collectionPath;
public IsEmptyPredicate(
CriteriaBuilderImpl criteriaBuilder,
PluralAttributePath<C> collectionPath) {
super( criteriaBuilder );
this.collectionPath = collectionPath;
}
@Override
public PluralAttributePath<C> getOperand() {
return collectionPath;
}
@Override
public void registerParameters(ParameterRegistry registry) {
// nothing to do
}
@Override
public String render(boolean isNegated, RenderingContext renderingContext) {
final String operator = isNegated ? " is not empty" : " is empty";
return getOperand().render( renderingContext ) + operator;
}
}