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//$Id: NotNullExpression.java 5685 2005-02-12 07:19:50Z steveebersole $
package org.hibernate.criterion;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.engine.TypedValue;
import org.hibernate.util.StringHelper;
/**
* Constrains a property to be non-null
* @author Gavin King
*/
public class NotNullExpression implements Criterion {
private final String propertyName;
private static final TypedValue[] NO_VALUES = new TypedValue[0];
protected NotNullExpression(String propertyName) {
this.propertyName = propertyName;
}
public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
String[] columns = criteriaQuery.getColumnsUsingProjection(criteria, propertyName);
String result = StringHelper.join(
" or ",
StringHelper.suffix( columns, " is not null" )
);
if (columns.length>1) result = '(' + result + ')';
return result;
//TODO: get SQL rendering out of this package!
}
public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
return NO_VALUES;
}
public String toString() {
return propertyName + " is not null";
}
}