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Hibernate's core ORM functionality
/*
* 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 .
*/
package org.hibernate.query.criteria.internal.expression;
import java.io.Serializable;
import javax.persistence.criteria.Expression;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.Renderable;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
/**
* Models an ANSI SQL NULLIF expression. NULLIF is a specialized CASE statement.
*
* @author Steve Ebersole
*/
public class NullifExpression extends ExpressionImpl implements Serializable {
private final Expression primaryExpression;
private final Expression secondaryExpression;
public NullifExpression(
CriteriaBuilderImpl criteriaBuilder,
Class javaType,
Expression primaryExpression,
Expression secondaryExpression) {
super( criteriaBuilder, (Class)determineType(javaType, primaryExpression) );
this.primaryExpression = primaryExpression;
this.secondaryExpression = secondaryExpression;
}
public NullifExpression(
CriteriaBuilderImpl criteriaBuilder,
Class javaType,
Expression primaryExpression,
Object secondaryExpression) {
super( criteriaBuilder, (Class)determineType(javaType, primaryExpression) );
this.primaryExpression = primaryExpression;
this.secondaryExpression = new LiteralExpression( criteriaBuilder, secondaryExpression );
}
private static Class determineType(Class javaType, Expression primaryExpression) {
return javaType != null ? javaType : primaryExpression.getJavaType();
}
public Expression getPrimaryExpression() {
return primaryExpression;
}
public Expression getSecondaryExpression() {
return secondaryExpression;
}
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getPrimaryExpression(), registry );
Helper.possibleParameter( getSecondaryExpression(), registry );
}
public String render(RenderingContext renderingContext) {
return "nullif("
+ ( (Renderable) getPrimaryExpression() ).render( renderingContext )
+ ','
+ ( (Renderable) getSecondaryExpression() ).render( renderingContext )
+ ")";
}
}