/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.dialect.function;
import java.sql.Types;
import org.hibernate.MappingException;
import org.hibernate.QueryException;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;
/**
* Classic AVG sqlfunction that return types as it was done in Hibernate 3.1
*
* @author Max Rydahl Andersen
*
*/
public class ClassicAvgFunction extends StandardSQLFunction {
public ClassicAvgFunction() {
super( "avg" );
}
public Type getReturnType(Type columnType, Mapping mapping) throws QueryException {
int[] sqlTypes;
try {
sqlTypes = columnType.sqlTypes( mapping );
}
catch ( MappingException me ) {
throw new QueryException( me );
}
if ( sqlTypes.length != 1 ) throw new QueryException( "multi-column type in avg()" );
int sqlType = sqlTypes[0];
if ( sqlType == Types.INTEGER || sqlType == Types.BIGINT || sqlType == Types.TINYINT ) {
return StandardBasicTypes.FLOAT;
}
else {
return columnType;
}
}
}